Bsi bs en 12622 2009 + a1 2013

5.1.1.4 ESPE using AOPD5.1.1.4.1 Light curtain ESPE using AOPDs in the form of light curtain shall comply with the following: a light curtains shall be in accordance with EN 61496-1 and

ICS 25.120.10

Safety of machine tools

— Hydraulic press

brakes

NORME EUROPÉENNE

English Version

Safety of machine tools - Hydraulic press brakes

Sécurité des machines-outils - Presses plieuses

hydrauliques Sicherheit von Werkzeugmaschinen - Hydraulische Gesenkbiegepressen

This European Standard was approved by CEN on 17 October 2009 and includes Amendment 1 approved by CEN on 26 August 2013 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä IS C H E S K O M IT E E FÜ R N O R M U N G

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2013 CEN All rights of exploitation in any form and by any means reserved Ref No EN 12622:2009+A1:2013: E

Amendments/corrigenda issued since publication

31 October 2013 Implementation of CEN amendment A1:2013

This British Standard was

published under the authority

of the Standards Policy and

The start and finish of text introduced or altered by amendment is indicated

in the text by tags Tags indicating changes to CEN text carry the number of the CEN amendment For example, text altered by CEN amendment A1 is indicated by 

The UK participation in its preparation was entrusted by Technical Committee MTE/1, Machine tools, to Subcommittee MTE/1/1, Machine tools – Safety

A list of organizations represented on this subcommittee can be obtained on request to its secretary

The publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

Compliance with a British Standard cannot confer immunity from legal obligations.

NORME EUROPÉENNE

English Version

Safety of machine tools - Hydraulic press brakes

Sécurité des machines-outils - Presses plieuses

hydrauliques Sicherheit von Werkzeugmaschinen - Hydraulische Gesenkbiegepressen

This European Standard was approved by CEN on 17 October 2009 and includes Amendment 1 approved by CEN on 26 August 2013 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä IS C H E S K O M IT E E FÜ R N O R M U N G

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2013 CEN All rights of exploitation in any form and by any means reserved Ref No EN 12622:2009+A1:2013: E

Contents

Foreword 4

Introduction 5

1 Scope 6

2 Normative references 6

3 Terms, definitions and abbreviations 9

3.1 Terms and definitions 9

3.2 Abbreviations 12

4 List of significant hazards 12

5 Safety requirements and/or measures 15

5.1 Protection of mechanical hazards 15

5.1.1 Description of the safeguarding of access to moving parts 15

5.1.1.1 General 15

5.1.1.2 Fixed enclosing guards 15

5.1.1.3 Interlocking guards with or without guard locking 15

5.1.1.4 ESPE using AOPD 16

5.1.1.5 Laser actuated AOPD 20

5.1.1.6 Hold to run control 22

5.1.1.7 Scanner systems 22

5.1.1.8 ESPE using AOPD when used in automatic cycle as a trip device 23

5.1.2 Location of the safeguarding of access to moving parts 24

5.1.2.1 Prevention of access from the front 24

5.1.2.2 Prevention of access from the sides 25

5.1.2.3 Prevention of access from the rear 25

5.2 Control systems 26

5.2.1 General 26

5.2.2 Manual control devices 26

5.2.3 Failure of power supply 26

5.2.4 Protection against external influences 26

5.2.5 Safety functions 26

5.2.5.1 General 26

5.2.5.2 Behaviour of the control system in case of failure 33

5.2.5.3 Stop or hold to stop closing stroke of the beam 34

5.2.5.4 Stop back gauges 34

5.2.5.5 Back gauges movement limitation 34

5.2.5.6 Stop work-piece support movement 35

5.2.5.7 Slow speed 35

5.2.5.8 Muting 35

5.2.5.9 Blanking 36

5.2.5.10 Emergency stop 36

5.2.5.11 Mode selection 36

5.2.5.12 Single stroke function 37

5.2.6 Other functions 37

5.2.6.1 Start 37

5.2.6.2 Restart 37

5.2.6.3 Reset 38

5.2.6.4 Normal stop 38

5.2.7 Use of electronic components 38

5.2.7.1 Access to the NC program 38

5.2.7.2 Use of PES for safety functions 38

5.3 Mode of operation 39

5.3.1 Description of the various modes of operation 39

5.3.2 Setting mode 39

5.3.3.2 Automatic cycle with automatic load and unload 40

5.4 Basic design considerations 40

5.4.1 Stability 40

5.4.1.1 Prevention of unintended gravity fall of the beam (down stroking press brakes) 40

5.4.1.2 Stability of the press brake 40

5.4.1.3 Stability of the work piece 40

5.4.2 Risk of break up during operation 40

5.4.3 Tool holder and tool design 41

5.4.4 Access to raised work stations or platforms 41

5.4.5 Slips, trips and falls 41

5.4.6 Release of trapped persons 41

5.4.7 Guarding of drives, transmission machinery and ancillary devices 41

5.5 Protection against non-mechanical hazard 42

5.5.1 Noise 42

5.5.2 Electrical hazards 43

5.5.3 Ergonomic and handling 43

5.5.4 Hydraulic and pneumatic systems 43

5.5.4.1 General 43

5.5.4.2 Valves 44

5.5.4.3 Hydraulic systems 44

5.5.5 Thermal hazards 45

5.5.6 Hazards generated by materials and substances 45

5.5.7 Hazards generated by lasers 45

5.5.8 High pressure fluid ejection hazards 45

5.5.9 Isolation and energy dissipation 45

5.5.10 Maintenance 45

5.5.11 Errors of fitting 45

6 Verification of the safety requirements and/or protective measures 46

7 Information for use 48

7.1 Marking 48

7.2 Instruction handbook 49

7.3 Commercial informations 50

Annex A (normative) Calculation of minimum safety distances 51

Annex B (normative) The overall response time of the press brake stopping performance 53

Annex C (informative) Example of redundant and monitored hydraulic control circuits for a down-stroking press brake 54

Annex D (normative) Conditions for noise measurement of press brakes 55

Annex E (informative) Side safeguarding for manually fed press brakes 56

Annex F (informative) Markings 57

Annex G (normative) Laser actuated AOPD system tests 58

Annex H (informative) Bending speed 59

Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42 61

Bibliography 62

Foreword

This document (EN 12622:2009+A1:2013) has been prepared by Technical Committee CEN/TC 143 “Machine

tools - Safety”, the secretariat of which is held by SNV

This European Standard shall be given the status of a national standard, either by publication of an identical text or

by endorsement, at the latest by April 2014, and conflicting national standards shall be withdrawn at the latest by

April 2014

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights

CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights

This document supersedes !EN 12622:2009"

This document includes Amendment 1 approved by CEN on 2013-08-26

The start and finish of text introduced or altered by amendment is indicated in the text by tags !"

This document has been prepared under a mandate given to CEN by the European Commission and the European

Free Trade Association, and supports essential requirements of EU Directive(s)

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document

This European Standard constitutes a revision of EN 12622:2001 for which it has been technically revised The

main modifications are listed below:

 complete reorder of Clause 5 "Safety requirements and/or measures";

 description of safety functions and its safety related part of control systems with categories assignated and /or

performance levels required (see Tables 2 and/or 3);

 addition of subclause 5.2.7 on the use of programmable electronic components (PES);

 addition of subclause 5.3.3 concerning production mode;

 addition of new safety functions and new safety devices: a stop work-piece support movement (see 5.2.5.6),

monitoring of slow speed (see 5.2.5.7), laser actuated AOPD (see 5.1.1.5), AOPDDR scanner systems (see

5.1.1.7.1) and ESPE using AOPD used in automatic cycle as a trip device (see 5.1.1.8)

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom

Contents

Foreword 4

Introduction 5

1 Scope 6

2 Normative references 6

3 Terms, definitions and abbreviations 9

3.1 Terms and definitions 9

3.2 Abbreviations 12

4 List of significant hazards 12

5 Safety requirements and/or measures 15

5.1 Protection of mechanical hazards 15

5.1.1 Description of the safeguarding of access to moving parts 15

5.1.1.1 General 15

5.1.1.2 Fixed enclosing guards 15

5.1.1.3 Interlocking guards with or without guard locking 15

5.1.1.4 ESPE using AOPD 16

5.1.1.5 Laser actuated AOPD 20

5.1.1.6 Hold to run control 22

5.1.1.7 Scanner systems 22

5.1.1.8 ESPE using AOPD when used in automatic cycle as a trip device 23

5.1.2 Location of the safeguarding of access to moving parts 24

5.1.2.1 Prevention of access from the front 24

5.1.2.2 Prevention of access from the sides 25

5.1.2.3 Prevention of access from the rear 25

5.2 Control systems 26

5.2.1 General 26

5.2.2 Manual control devices 26

5.2.3 Failure of power supply 26

5.2.4 Protection against external influences 26

5.2.5 Safety functions 26

5.2.5.1 General 26

5.2.5.2 Behaviour of the control system in case of failure 33

5.2.5.3 Stop or hold to stop closing stroke of the beam 34

5.2.5.4 Stop back gauges 34

5.2.5.5 Back gauges movement limitation 34

5.2.5.6 Stop work-piece support movement 35

5.2.5.7 Slow speed 35

5.2.5.8 Muting 35

5.2.5.9 Blanking 36

5.2.5.10 Emergency stop 36

5.2.5.11 Mode selection 36

5.2.5.12 Single stroke function 37

5.2.6 Other functions 37

5.2.6.1 Start 37

5.2.6.2 Restart 37

5.2.6.3 Reset 38

5.2.6.4 Normal stop 38

5.2.7 Use of electronic components 38

5.2.7.1 Access to the NC program 38

5.2.7.2 Use of PES for safety functions 38

5.3 Mode of operation 39

5.3.1 Description of the various modes of operation 39

5.3.2 Setting mode 39

Contents

Introduction 5

1 Scope 6

2 Normative references 6

3 Terms, definitions and abbreviations 9

3.1 Terms and definitions 9

3.2 Abbreviations 12

4 List of significant hazards 12

5 Safety requirements and/or measures 15

5.1 Protection of mechanical hazards 15

5.1.1 Description of the safeguarding of access to moving parts 15

5.1.1.1 General 15

5.1.1.2 Fixed enclosing guards 15

5.1.1.3 Interlocking guards with or without guard locking 15

5.1.1.4 ESPE using AOPD 16

5.1.1.5 Laser actuated AOPD 20

5.1.1.6 Hold to run control 22

5.1.1.7 Scanner systems 22

5.1.1.8 ESPE using AOPD when used in automatic cycle as a trip device 23

5.1.2 Location of the safeguarding of access to moving parts 24

5.1.2.1 Prevention of access from the front 24

5.1.2.2 Prevention of access from the sides 25

5.1.2.3 Prevention of access from the rear 25

5.2 Control systems 26

5.2.1 General 26

5.2.2 Manual control devices 26

5.2.3 Failure of power supply 26

5.2.4 Protection against external influences 26

5.2.5 Safety functions 26

5.2.5.1 General 26

5.2.5.2 Behaviour of the control system in case of failure 33

5.2.5.3 Stop or hold to stop closing stroke of the beam 34

5.2.5.4 Stop back gauges 34

5.2.5.5 Back gauges movement limitation 34

5.2.5.6 Stop work-piece support movement 35

5.2.5.7 Slow speed 35

5.2.5.8 Muting 35

5.2.5.9 Blanking 36

5.2.5.10 Emergency stop 36

5.2.5.11 Mode selection 36

5.2.5.12 Single stroke function 37

5.2.6 Other functions 37

5.2.6.1 Start 37

5.2.6.2 Restart 37

5.2.6.3 Reset 38

5.2.6.4 Normal stop 38

5.2.7 Use of electronic components 38

5.2.7.1 Access to the NC program 38

5.2.7.2 Use of PES for safety functions 38

5.3 Mode of operation 39

5.3.1 Description of the various modes of operation 39

5.3.2 Setting mode 39

5.3.3 Production modes 39

Contents

Introduction 5

1 Scope 6

2 Normative references 6

3 Terms, definitions and abbreviations 9

3.1 Terms and definitions 9

3.2 Abbreviations 12

4 List of significant hazards 12

5 Safety requirements and/or measures 15

5.1 Protection of mechanical hazards 15

5.1.1 Description of the safeguarding of access to moving parts 15

5.1.1.1 General 15

5.1.1.2 Fixed enclosing guards 15

5.1.1.3 Interlocking guards with or without guard locking 15

5.1.1.4 ESPE using AOPD 16

5.1.1.5 Laser actuated AOPD 20

5.1.1.6 Hold to run control 22

5.1.1.7 Scanner systems 22

5.1.1.8 ESPE using AOPD when used in automatic cycle as a trip device 23

5.1.2 Location of the safeguarding of access to moving parts 24

5.1.2.1 Prevention of access from the front 24

5.1.2.2 Prevention of access from the sides 25

5.1.2.3 Prevention of access from the rear 25

5.2 Control systems 26

5.2.1 General 26

5.2.2 Manual control devices 26

5.2.3 Failure of power supply 26

5.2.4 Protection against external influences 26

5.2.5 Safety functions 26

5.2.5.1 General 26

5.2.5.2 Behaviour of the control system in case of failure 33

5.2.5.3 Stop or hold to stop closing stroke of the beam 34

5.2.5.4 Stop back gauges 34

5.2.5.5 Back gauges movement limitation 34

5.2.5.6 Stop work-piece support movement 35

5.2.5.7 Slow speed 35

5.2.5.8 Muting 35

5.2.5.9 Blanking 36

5.2.5.10 Emergency stop 36

5.2.5.11 Mode selection 36

5.2.5.12 Single stroke function 37

5.2.6 Other functions 37

5.2.6.1 Start 37

5.2.6.2 Restart 37

5.2.6.3 Reset 38

5.2.6.4 Normal stop 38

5.2.7 Use of electronic components 38

5.2.7.1 Access to the NC program 38

5.2.7.2 Use of PES for safety functions 38

5.3 Mode of operation 39

5.3.1 Description of the various modes of operation 39

5.3.2 Setting mode 39

5.3.3.2 Automatic cycle with automatic load and unload 40

5.4 Basic design considerations 40

5.4.1 Stability 40

5.4.1.1 Prevention of unintended gravity fall of the beam (down stroking press brakes) 40

5.4.1.2 Stability of the press brake 40

5.4.1.3 Stability of the work piece 40

5.4.2 Risk of break up during operation 40

5.4.3 Tool holder and tool design 41

5.4.4 Access to raised work stations or platforms 41

5.4.5 Slips, trips and falls 41

5.4.6 Release of trapped persons 41

5.4.7 Guarding of drives, transmission machinery and ancillary devices 41

5.5 Protection against non-mechanical hazard 42

5.5.1 Noise 42

5.5.2 Electrical hazards 43

5.5.3 Ergonomic and handling 43

5.5.4 Hydraulic and pneumatic systems 43

5.5.4.1 General 43

5.5.4.2 Valves 44

5.5.4.3 Hydraulic systems 44

5.5.5 Thermal hazards 45

5.5.6 Hazards generated by materials and substances 45

5.5.7 Hazards generated by lasers 45

5.5.8 High pressure fluid ejection hazards 45

5.5.9 Isolation and energy dissipation 45

5.5.10 Maintenance 45

5.5.11 Errors of fitting 45

6 Verification of the safety requirements and/or protective measures 46

7 Information for use 48

7.1 Marking 48

7.2 Instruction handbook 49

7.3 Commercial informations 50

Annex A (normative) Calculation of minimum safety distances 51

Annex B (normative) The overall response time of the press brake stopping performance 53

Annex C (informative) Example of redundant and monitored hydraulic control circuits for a down-stroking press brake 54

Annex D (normative) Conditions for noise measurement of press brakes 55

Annex E (informative) Side safeguarding for manually fed press brakes 56

Annex F (informative) Markings 57

Annex G (normative) Laser actuated AOPD system tests 58

Annex H (informative) Bending speed 59

Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42 61

Bibliography 62

Foreword

This document (EN 12622:2009+A1:2013) has been prepared by Technical Committee CEN/TC 143 “Machine

tools - Safety”, the secretariat of which is held by SNV

This European Standard shall be given the status of a national standard, either by publication of an identical text or

by endorsement, at the latest by April 2014, and conflicting national standards shall be withdrawn at the latest by

April 2014

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights

CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights

This document supersedes !EN 12622:2009"

This document includes Amendment 1 approved by CEN on 2013-08-26

The start and finish of text introduced or altered by amendment is indicated in the text by tags !"

This document has been prepared under a mandate given to CEN by the European Commission and the European

Free Trade Association, and supports essential requirements of EU Directive(s)

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document

This European Standard constitutes a revision of EN 12622:2001 for which it has been technically revised The

main modifications are listed below:

 complete reorder of Clause 5 "Safety requirements and/or measures";

 description of safety functions and its safety related part of control systems with categories assignated and /or

performance levels required (see Tables 2 and/or 3);

 addition of subclause 5.2.7 on the use of programmable electronic components (PES);

 addition of subclause 5.3.3 concerning production mode;

 addition of new safety functions and new safety devices: a stop work-piece support movement (see 5.2.5.6),

monitoring of slow speed (see 5.2.5.7), laser actuated AOPD (see 5.1.1.5), AOPDDR scanner systems (see

5.1.1.7.1) and ESPE using AOPD used in automatic cycle as a trip device (see 5.1.1.8)

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom

EN 12622:2009+A1:2013 (E)

This European Standard is a C type standard as defined in EN ISO 12100-1:2003

The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this standard When provisions of this C type standard are different from those which are stated in A or B standards, the provision of this C type standard take precedence over the provisions of the other standards for machines that have been designed and built according to the provisions of this C type standard

In addition, press brakes comply as appropriate with EN ISO 12100-1 and EN ISO 12100-2 for hazards which are not covered by this standard

The requirements of this European Standard concern designers, manufacturers, suppliers and importers of machines described in the scope

This European Standard also includes information to be provided by the manufacturer to the user

Foreword

This document (EN 12622:2009+A1:2013) has been prepared by Technical Committee CEN/TC 143 “Machine

tools - Safety”, the secretariat of which is held by SNV

This European Standard shall be given the status of a national standard, either by publication of an identical text or

by endorsement, at the latest by April 2014, and conflicting national standards shall be withdrawn at the latest by

April 2014

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights

CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights

This document supersedes !EN 12622:2009"

This document includes Amendment 1 approved by CEN on 2013-08-26

The start and finish of text introduced or altered by amendment is indicated in the text by tags !"

This document has been prepared under a mandate given to CEN by the European Commission and the European

Free Trade Association, and supports essential requirements of EU Directive(s)

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document

This European Standard constitutes a revision of EN 12622:2001 for which it has been technically revised The

main modifications are listed below:

 complete reorder of Clause 5 "Safety requirements and/or measures";

 description of safety functions and its safety related part of control systems with categories assignated and /or

performance levels required (see Tables 2 and/or 3);

 addition of subclause 5.2.7 on the use of programmable electronic components (PES);

 addition of subclause 5.3.3 concerning production mode;

 addition of new safety functions and new safety devices: a stop work-piece support movement (see 5.2.5.6),

monitoring of slow speed (see 5.2.5.7), laser actuated AOPD (see 5.1.1.5), AOPDDR scanner systems (see

5.1.1.7.1) and ESPE using AOPD used in automatic cycle as a trip device (see 5.1.1.8)

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom

5.3.3.2 Automatic cycle with automatic load and unload 40

5.4 Basic design considerations 40

5.4.1 Stability 40

5.4.1.1 Prevention of unintended gravity fall of the beam (down stroking press brakes) 40

5.4.1.2 Stability of the press brake 40

5.4.1.3 Stability of the work piece 40

5.4.2 Risk of break up during operation 40

5.4.3 Tool holder and tool design 41

5.4.4 Access to raised work stations or platforms 41

5.4.5 Slips, trips and falls 41

5.4.6 Release of trapped persons 41

5.4.7 Guarding of drives, transmission machinery and ancillary devices 41

5.5 Protection against non-mechanical hazard 42

5.5.1 Noise 42

5.5.2 Electrical hazards 43

5.5.3 Ergonomic and handling 43

5.5.4 Hydraulic and pneumatic systems 43

5.5.4.1 General 43

5.5.4.2 Valves 44

5.5.4.3 Hydraulic systems 44

5.5.5 Thermal hazards 45

5.5.6 Hazards generated by materials and substances 45

5.5.7 Hazards generated by lasers 45

5.5.8 High pressure fluid ejection hazards 45

5.5.9 Isolation and energy dissipation 45

5.5.10 Maintenance 45

5.5.11 Errors of fitting 45

6 Verification of the safety requirements and/or protective measures 46

7 Information for use 48

7.1 Marking 48

7.2 Instruction handbook 49

7.3 Commercial informations 50

Annex A (normative) Calculation of minimum safety distances 51

Annex B (normative) The overall response time of the press brake stopping performance 53

Annex C (informative) Example of redundant and monitored hydraulic control circuits for a down-stroking press brake 54

Annex D (normative) Conditions for noise measurement of press brakes 55

Annex E (informative) Side safeguarding for manually fed press brakes 56

Annex F (informative) Markings 57

Annex G (normative) Laser actuated AOPD system tests 58

Annex H (informative) Bending speed 59

Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42 61

Bibliography 62

This European Standard is a C type standard as defined in EN ISO 12100-1:2003

The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this standard When provisions of this C type standard are different from those which are stated in A or B standards, the provision of this C type standard take precedence over the provisions of the other standards for machines that have been designed and built according to the provisions of this C type standard

In addition, press brakes comply as appropriate with EN ISO 12100-1 and EN ISO 12100-2 for hazards which are not covered by this standard

The requirements of this European Standard concern designers, manufacturers, suppliers and importers of machines described in the scope

This European Standard also includes information to be provided by the manufacturer to the user

Foreword

This document (EN 12622:2009+A1:2013) has been prepared by Technical Committee CEN/TC 143 “Machine

tools - Safety”, the secretariat of which is held by SNV

This European Standard shall be given the status of a national standard, either by publication of an identical text or

by endorsement, at the latest by April 2014, and conflicting national standards shall be withdrawn at the latest by

April 2014

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights

CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights

This document supersedes !EN 12622:2009"

This document includes Amendment 1 approved by CEN on 2013-08-26

The start and finish of text introduced or altered by amendment is indicated in the text by tags !"

This document has been prepared under a mandate given to CEN by the European Commission and the European

Free Trade Association, and supports essential requirements of EU Directive(s)

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document

This European Standard constitutes a revision of EN 12622:2001 for which it has been technically revised The

main modifications are listed below:

 complete reorder of Clause 5 "Safety requirements and/or measures";

 description of safety functions and its safety related part of control systems with categories assignated and /or

performance levels required (see Tables 2 and/or 3);

 addition of subclause 5.2.7 on the use of programmable electronic components (PES);

 addition of subclause 5.3.3 concerning production mode;

 addition of new safety functions and new safety devices: a stop work-piece support movement (see 5.2.5.6),

monitoring of slow speed (see 5.2.5.7), laser actuated AOPD (see 5.1.1.5), AOPDDR scanner systems (see

5.1.1.7.1) and ESPE using AOPD used in automatic cycle as a trip device (see 5.1.1.8)

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom

1 Scope

This European Standard specifies technical safety requirements and protective measures to be adopted by

persons undertaking the design, manufacture and supply of hydraulic press brakes which are designed to work

cold metal or material partly of metal and hereafter referred to as machines

This European Standard also covers hydraulic press brakes, whose primary intended use is the cold working of

metal, which are to be used in the same way to work other sheet materials such as cardboard or plastic

The requirements in this European Standard take account of intended use, including foreseeable misuse as

defined in 3.22 of EN ISO 12100-1:2003 This European Standard presumes access to the press brake from all

directions, deals with the hazards described in Clause 4, and specifies the safety measures for both the operator

and other exposed persons

This European Standard also applies to:

 ancillary devices which are an integral part of the press brake, e.g back gauges and adjustable front sheet

supports;

 machines which are integrated into an automatic production line where the hazards and risk arising are

comparable to those of machine working separately

The requirements of this European Standard apply to all hydraulic press brakes whatever the technology used in

their control system, e.g electromechanical and/ or electronic

This European Standard does not apply to machines whose principal designed purpose is:

a) sheet folding by rotary action;

b) tube and pipe bending by rotary action;

c) roll bending

This European Standard applies to machines built after the date of issue of this European Standard

This European Standard does not cover the safety aspect of automatic loading and unloading equipment

Some guidance how to take into account additional automatic loading and unloading equipment can be found in

ISO 11161

2 Normative references

The following referenced documents are indispensable for the application of this document For dated references,

only the edition cited applies For undated references, the latest edition of the referenced document (including any

amendments) applies

EN 349, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body

EN 574:1996, Safety of machinery — Two-hand control devices — Functional aspects — Principles for design

EN 614-1, Safety of machinery — Ergonomic design principles — Part 1: Terminology and general principles

EN 894-1, Safety of machinery — Ergonomics requirements for the design of displays and control actuators —

Part 1: General principles for human interactions with displays and control actuators

EN 894-2, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part

2: Displays

EN 894-3, Safety of machinery — Ergonomics requirements for the design of displays and control actuators —

EN 953:1997, Safety of machinery — Guards — General requirements for the design and construction of fixed and

movable guards

EN 954-1, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design

EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components —

Hydraulics

EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components —

Pneumatics

EN 999:1998, Safety of machinery — The positioning of protective equipment in respect of approach speeds of

parts of the human body

EN 1005-1, Safety of machinery — Human physical performance — Part 1: Terms and definitions

EN 1005-2, Safety of machinery — Human physical performance — Part 2: Manual handling of machinery and

components parts of machinery

EN 1005-3, Safety of machinery — Human physical performance — Part 3: Recommended force limits for

machinery operation

EN 1005-4, Safety of machinery — Human physical performance — Part 4: Evaluation of working postures and

movements in relation to machinery

EN 1037:1995, Safety of machinery — Prevention of unexpected start-up

EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — Principles for design and

selection

EN 1837, Safety of machinery — Integral lighting of machines

EN 50370-1, Electromagnetic compatibility (EMC) — Product family standard for machine tools — Part 1: Emission

EN 50370-2, Electromagnetic compatibility (EMC) — Product family standard for machine tools — Part 2: Immunity

EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC

60204-1:2005, modified)

EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989).

EN 60825-1:2007, Safety of laser products — Part 1: Equipment classification and requirements

(IEC 60825-1:2007)

EN 60947-5-1:2004, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and switching

elements — Electromechanical control circuit devices (IEC 60947-5-1:2003)

EN 60947-5-3, Low-voltage switchgear and controlgear — Part 5-3: Control circuit devices and switching elements

— Requirements for proximity devices with defined behaviour under fault conditions (PDF) (IEC 60947-5-3:1999)

EN 61310-2, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for marking

(IEC 61310-2:2007)

EN 61496-1:2004, Safety of machinery — Electro-sensitive protective equipment — Part 1: General requirements

and tests (IEC 61496-1:2004, modified)

EN 62061:2005, Safety of machinery — Functional safety of safety-related electrical, electronic and programmable

electronic control systems (IEC 62061:2005)

1 Scope

This European Standard specifies technical safety requirements and protective measures to be adopted by

persons undertaking the design, manufacture and supply of hydraulic press brakes which are designed to work

cold metal or material partly of metal and hereafter referred to as machines

This European Standard also covers hydraulic press brakes, whose primary intended use is the cold working of

metal, which are to be used in the same way to work other sheet materials such as cardboard or plastic

The requirements in this European Standard take account of intended use, including foreseeable misuse as

defined in 3.22 of EN ISO 12100-1:2003 This European Standard presumes access to the press brake from all

directions, deals with the hazards described in Clause 4, and specifies the safety measures for both the operator

and other exposed persons

This European Standard also applies to:

 ancillary devices which are an integral part of the press brake, e.g back gauges and adjustable front sheet

supports;

 machines which are integrated into an automatic production line where the hazards and risk arising are

comparable to those of machine working separately

The requirements of this European Standard apply to all hydraulic press brakes whatever the technology used in

their control system, e.g electromechanical and/ or electronic

This European Standard does not apply to machines whose principal designed purpose is:

a) sheet folding by rotary action;

b) tube and pipe bending by rotary action;

c) roll bending

This European Standard applies to machines built after the date of issue of this European Standard

This European Standard does not cover the safety aspect of automatic loading and unloading equipment

Some guidance how to take into account additional automatic loading and unloading equipment can be found in

ISO 11161

2 Normative references

The following referenced documents are indispensable for the application of this document For dated references,

only the edition cited applies For undated references, the latest edition of the referenced document (including any

amendments) applies

EN 349, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body

EN 574:1996, Safety of machinery — Two-hand control devices — Functional aspects — Principles for design

EN 614-1, Safety of machinery — Ergonomic design principles — Part 1: Terminology and general principles

EN 894-1, Safety of machinery — Ergonomics requirements for the design of displays and control actuators —

Part 1: General principles for human interactions with displays and control actuators

EN 894-2, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part

2: Displays

EN 894-3, Safety of machinery — Ergonomics requirements for the design of displays and control actuators —

EN 953:1997, Safety of machinery — Guards — General requirements for the design and construction of fixed and

movable guards

EN 954-1, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design

EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components —

Hydraulics

EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components —

Pneumatics

EN 999:1998, Safety of machinery — The positioning of protective equipment in respect of approach speeds of

parts of the human body

EN 1005-1, Safety of machinery — Human physical performance — Part 1: Terms and definitions

EN 1005-2, Safety of machinery — Human physical performance — Part 2: Manual handling of machinery and

components parts of machinery

EN 1005-3, Safety of machinery — Human physical performance — Part 3: Recommended force limits for

machinery operation

EN 1005-4, Safety of machinery — Human physical performance — Part 4: Evaluation of working postures and

movements in relation to machinery

EN 1037:1995, Safety of machinery — Prevention of unexpected start-up

EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — Principles for design and

selection

EN 1837, Safety of machinery — Integral lighting of machines

EN 50370-1, Electromagnetic compatibility (EMC) — Product family standard for machine tools — Part 1: Emission

EN 50370-2, Electromagnetic compatibility (EMC) — Product family standard for machine tools — Part 2: Immunity

EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC

60204-1:2005, modified)

EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989).

EN 60825-1:2007, Safety of laser products — Part 1: Equipment classification and requirements

(IEC 60825-1:2007)

EN 60947-5-1:2004, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and switching

elements — Electromechanical control circuit devices (IEC 60947-5-1:2003)

EN 60947-5-3, Low-voltage switchgear and controlgear — Part 5-3: Control circuit devices and switching elements

— Requirements for proximity devices with defined behaviour under fault conditions (PDF) (IEC 60947-5-3:1999)

EN 61310-2, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for marking

(IEC 61310-2:2007)

EN 61496-1:2004, Safety of machinery — Electro-sensitive protective equipment — Part 1: General requirements

and tests (IEC 61496-1:2004, modified)

EN 62061:2005, Safety of machinery — Functional safety of safety-related electrical, electronic and programmable

electronic control systems (IEC 62061:2005)

EN ISO 3746:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure —

Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995)

EN ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and equipment

(ISO 4871:1996)

EN ISO 9614 (all parts), Acoustics — Determination of sound power levels of noise sources using sound intensity

(ISO 9614)

EN ISO 11202:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound

pressure levels at a work station and at other specified positions — Survey method in situ (ISO 11202:1995)

EN ISO 11688-1:1998, Acoustics — Recommended practice for the design of low-noise machinery and equipment

— Part 1: Planning ((ISO/TR 11688-1:1995)

EN ISO 11688-2, Acoustics — Recommended practice for the design of low-noise machinery and equipment —

Part 2: Introduction to the physics of low-noise design (ISO/TR 11688-2:1998)

EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic

terminology, methodology (ISO 12100-1:2003)

EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical

principles (ISO 12100-2:2003)

EN ISO 13732-1, Ergonomics of the thermal environment — Methods for the assessment of human responses to

contact with surfaces — Part 1: Hot surfaces (ISO 13732-1:2006)

EN ISO 13849-1:2008, Safety of machinery — Safety-related parts of control systems — Part 1: General principles

for design (ISO 13849-1:2006)

EN ISO 2, Safety of machinery — Safety-related parts of control systems — Part 2: Validation ((ISO

13849-2:2003)

EN ISO 13850, Safety of machinery — Emergency stop — Principles for design (ISO 13850:2006)

EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by the upper

and lower limbs (ISO 13857:2008)

EN ISO 14121-1, Safety of machinery — Risk assessment — Part 1: Principles (ISO 14121-1:2007)

EN ISO 14122-1, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of fixed

means of access between two levels (ISO 14122-1:2001)

EN ISO 14122-2, Safety of machinery — Permanent means of access to machinery — Part 2: Working platforms

and walkways (ISO 14122-2:2001)

EN ISO 14122-3, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs, stepladders

and guard-rails (ISO 14122-3:2001)

EN ISO 14122-4, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders (ISO

14122-4:2004)

EN ISO 14738, Safety of machinery — Anthropometric requirements for the design of workstations at machinery

(ISO 14738:2002)

CLC/TS 61496-2:2006, Safety of machinery — Electro-sensitive protective equipment — Part 2: Particular

requirements for equipment using active opto-electronic protective devices (AOPDs) (IEC 61496-2:2006)

CLC/TS 61496-3, Safety of machinery — Electro-sensitive protective equipment — Part 3: Particular requirements

for Active Opto-electronic Protective Devices responsive to Diffuse Reflection (AOPDDR)

3 Terms, definitions and abbreviations 3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003 and the following apply

3.1.1 beam

main reciprocating press brake member which normally holds the punch on a down-stroking press brake, and which normally holds the die on an up-stroking press brake

3.1.2 blanking

optional function that permits an object of a size greater than the detection capability of the ESPE to be located within the detection zone without causing an OFF-state of the OSSD(s)

operating mode where the operating cycle is repeated continuously or intermittently, all functions achieved without manual intervention after initiation

3.1.4 operating cycle

movement completed by the moving part of the tools from the cycle start position to the bottom dead centre and back to the cycle stop position

NOTE 1 The operating cycle includes all operations carried out during this movement

NOTE 2 Normally, the cycle start and stop position is the top dead center

3.1.5 single cycle

operating mode where each operating cycle of the beam has to be positively actuated by the operator

3.1.6 dead centre(s)

point at which the tool, during its travel, is either nearest/closest to the die (generally it corresponds to the end of the closing stroke), known as the bottom dead centre, or furthest from the die (generally it corresponds to the end

of the opening stroke), known as the top dead centre

NOTE On an up stroking press brake, the centres are reversed

3.1.7 hydraulic press brake

machine designed or intended to transmit energy to the moving part of the tools by hydraulic means principally for the purpose of bending between narrow forming tools along straight lines

NOTE See Figure 1

EN ISO 3746:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure —

Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995)

EN ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and equipment

(ISO 4871:1996)

EN ISO 9614 (all parts), Acoustics — Determination of sound power levels of noise sources using sound intensity

(ISO 9614)

EN ISO 11202:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound

pressure levels at a work station and at other specified positions — Survey method in situ (ISO 11202:1995)

EN ISO 11688-1:1998, Acoustics — Recommended practice for the design of low-noise machinery and equipment

— Part 1: Planning ((ISO/TR 11688-1:1995)

EN ISO 11688-2, Acoustics — Recommended practice for the design of low-noise machinery and equipment —

Part 2: Introduction to the physics of low-noise design (ISO/TR 11688-2:1998)

EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic

terminology, methodology (ISO 12100-1:2003)

EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical

principles (ISO 12100-2:2003)

EN ISO 13732-1, Ergonomics of the thermal environment — Methods for the assessment of human responses to

contact with surfaces — Part 1: Hot surfaces (ISO 13732-1:2006)

EN ISO 13849-1:2008, Safety of machinery — Safety-related parts of control systems — Part 1: General principles

for design (ISO 13849-1:2006)

EN ISO 2, Safety of machinery — Safety-related parts of control systems — Part 2: Validation ((ISO

13849-2:2003)

EN ISO 13850, Safety of machinery — Emergency stop — Principles for design (ISO 13850:2006)

EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by the upper

and lower limbs (ISO 13857:2008)

EN ISO 14121-1, Safety of machinery — Risk assessment — Part 1: Principles (ISO 14121-1:2007)

EN ISO 14122-1, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of fixed

means of access between two levels (ISO 14122-1:2001)

EN ISO 14122-2, Safety of machinery — Permanent means of access to machinery — Part 2: Working platforms

and walkways (ISO 14122-2:2001)

EN ISO 14122-3, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs, stepladders

and guard-rails (ISO 14122-3:2001)

EN ISO 14122-4, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders (ISO

14122-4:2004)

EN ISO 14738, Safety of machinery — Anthropometric requirements for the design of workstations at machinery

(ISO 14738:2002)

CLC/TS 61496-2:2006, Safety of machinery — Electro-sensitive protective equipment — Part 2: Particular

requirements for equipment using active opto-electronic protective devices (AOPDs) (IEC 61496-2:2006)

CLC/TS 61496-3, Safety of machinery — Electro-sensitive protective equipment — Part 3: Particular requirements

for Active Opto-electronic Protective Devices responsive to Diffuse Reflection (AOPDDR)

3 Terms, definitions and abbreviations 3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003 and the following apply

3.1.1 beam

main reciprocating press brake member which normally holds the punch on a down-stroking press brake, and which normally holds the die on an up-stroking press brake

3.1.2 blanking

optional function that permits an object of a size greater than the detection capability of the ESPE to be located within the detection zone without causing an OFF-state of the OSSD(s)

operating mode where the operating cycle is repeated continuously or intermittently, all functions achieved without manual intervention after initiation

3.1.4 operating cycle

movement completed by the moving part of the tools from the cycle start position to the bottom dead centre and back to the cycle stop position

NOTE 1 The operating cycle includes all operations carried out during this movement

NOTE 2 Normally, the cycle start and stop position is the top dead center

3.1.5 single cycle

operating mode where each operating cycle of the beam has to be positively actuated by the operator

3.1.6 dead centre(s)

point at which the tool, during its travel, is either nearest/closest to the die (generally it corresponds to the end of the closing stroke), known as the bottom dead centre, or furthest from the die (generally it corresponds to the end

of the opening stroke), known as the top dead centre

NOTE On an up stroking press brake, the centres are reversed

3.1.7 hydraulic press brake

machine designed or intended to transmit energy to the moving part of the tools by hydraulic means principally for the purpose of bending between narrow forming tools along straight lines

NOTE See Figure 1

overall system stopping performance

overall response time

overall stopping distance

time/distance occurring from actuating the protective device to the cessation of hazardous motion, or to the

machine assuming a safe condition

single stroke function

feature used to limit the motion of the tool to one operating cycle even if the stroke initiating means (e.g a pedal) is

held in the operating position

3.1.12

tools

combination of punch and die

3.1.13

up-stroking press brake

press brake in which the lower tool moves upwards during the closing stroke

NOTE The movement is reciprocal to a down-stroking press, see Figure 1

Key

1 Press cylinder 6 Backgauge 11 Side safeguard

2 Control panel 7 Hydraulic system 12 Light Curtain

3 Electrical Switch Gear Cabinet 8 Beam 13 Frame

4 Foot pedal 9 Tools

5 Work-piece support 10 Bed

3.1.14 down-stroking press brake

press brake in which the upper tool moves downwards during the closing stroke

3.1.15 programmable electronic system

PESsystem for control, protection or monitoring based on one or more programmable electronic devices, including all elements of the system such as power supplies, sensors and other input devices, data highways and other communication paths, and actuators and other output devices

[EN 61508-4:2001, definition 3.3.2]

3.1.16 electro-sensitive protective equipment

ESPEassembly of devices and/or components working together for protective tripping or presence-sensing purposes comprising

 a sensing device;

 controlling monitoring devices;

 output devices and all interconnecting wiring

[EN 61496-1:2004, definition 3.5]

NOTE For the purposes of this European Standard, ESPE covers AOPD, AOPDDR, laser actuated AOPD

3.1.17 light curtain

active opto-electronic protective device (AOPD) comprising an integrated assembly of one or more emitting element(s) and one or more receiving element(s) forming a detection zone with a detection capability specified by the supplier

[CLC/TS 61496-2:2006, definition 3.205]

3.1.18 output signal switching device

OSSDcomponent of the electro-sensitive protective device (ESPE) connected to the machine control system which, when the sensing device is actuated during normal operation, responds by going to the OFF-state

[EN 61496-1:2004, definition 3.19]

3.1.19 safety-related parts of the control system

parts (mechanical, hydraulic, electrical, pneumatic) of a control system whose failure can result in a hazard

3.1.20 single break cycle initiation

initiation of the single operating cycle of the beam by actuating the light curtain by an object (e.g work material, hand) and subsequently withdrawing the object from the detection zone of the curtain

3.1.21 double break cycle initiation

initiation of the single operating cycle of the beam by twice in succession disturbing (actuating) the light curtain by

an object (e.g work material, hand) and subsequently withdrawing the object from the detection zone of the curtain

3.1.22 overrun

overall system stopping performance

overall response time

overall stopping distance

time/distance occurring from actuating the protective device to the cessation of hazardous motion, or to the

machine assuming a safe condition

single stroke function

feature used to limit the motion of the tool to one operating cycle even if the stroke initiating means (e.g a pedal) is

held in the operating position

3.1.12

tools

combination of punch and die

3.1.13

up-stroking press brake

press brake in which the lower tool moves upwards during the closing stroke

NOTE The movement is reciprocal to a down-stroking press, see Figure 1

Key

1 Press cylinder 6 Backgauge 11 Side safeguard

2 Control panel 7 Hydraulic system 12 Light Curtain

3 Electrical Switch Gear Cabinet 8 Beam 13 Frame

4 Foot pedal 9 Tools

5 Work-piece support 10 Bed

3.1.14 down-stroking press brake

press brake in which the upper tool moves downwards during the closing stroke

3.1.15 programmable electronic system

PESsystem for control, protection or monitoring based on one or more programmable electronic devices, including all elements of the system such as power supplies, sensors and other input devices, data highways and other communication paths, and actuators and other output devices

[EN 61508-4:2001, definition 3.3.2]

3.1.16 electro-sensitive protective equipment

ESPEassembly of devices and/or components working together for protective tripping or presence-sensing purposes comprising

 a sensing device;

 controlling monitoring devices;

 output devices and all interconnecting wiring

[EN 61496-1:2004, definition 3.5]

NOTE For the purposes of this European Standard, ESPE covers AOPD, AOPDDR, laser actuated AOPD

3.1.17 light curtain

active opto-electronic protective device (AOPD) comprising an integrated assembly of one or more emitting element(s) and one or more receiving element(s) forming a detection zone with a detection capability specified by the supplier

[CLC/TS 61496-2:2006, definition 3.205]

3.1.18 output signal switching device

OSSDcomponent of the electro-sensitive protective device (ESPE) connected to the machine control system which, when the sensing device is actuated during normal operation, responds by going to the OFF-state

[EN 61496-1:2004, definition 3.19]

3.1.19 safety-related parts of the control system

parts (mechanical, hydraulic, electrical, pneumatic) of a control system whose failure can result in a hazard

3.1.20 single break cycle initiation

initiation of the single operating cycle of the beam by actuating the light curtain by an object (e.g work material, hand) and subsequently withdrawing the object from the detection zone of the curtain

3.1.21 double break cycle initiation

initiation of the single operating cycle of the beam by twice in succession disturbing (actuating) the light curtain by

an object (e.g work material, hand) and subsequently withdrawing the object from the detection zone of the curtain

3.1.22 overrun

overrun monitoring device

device which provides a signal to inhibit further complete stroke when the overrun exceeds the pre-set limit(s)

3.1.24

bending plane

vertical plane passing through the first contact line with the material from the upper tool nearest to the operator

3.2 Abbreviations

TDC Top Dead Centre

AOPD Active Opto-electronic Protective Device

NC Numerical Control

AOPDDR Active Opto-electronic Protective Device responsive to Diffuse Reflection (Scanner)

PLC Programmable logic controller

PES Programmable electronic system

ESPE Electro-sensitive protective equipment

OSSD Output signal switching device

4 List of significant hazards

This clause contains the significant and other relevant hazards, hazardous situations and events (see

EN ISO 14121-1) as far as they are dealt with in this European Standard, identified by risk assessment as

significant for the machines as defined in the scope and which require action to eliminate or reduce the risk This

European Standard deals with:

 significant hazards by defining safety requirements and/ or measures or by reference to relevant type B

standards;

 hazards which are present but not significant e.g general, minor or secondary hazards by reference to

EN ISO 12100-1:2003 and EN ISO 12100-2:2003

These hazards are listed in Table 1 in accordance with EN ISO 14121-1

Particular attention is given to hazards dealing with:

 crushing and shearing between moving tools, beam, back gauges, work-piece supports (see Table 1);

 entanglement on or drawing into moving parts of the machine, guards, motor and drive machinery, mechanical

handling device (see Table 1);

 ejection of machine components of hydraulic system (see Table 1)

Main danger zones are:

 tools area with moving beam, back gauges, work-piece supports;

 mechanical handling device;

 motor and drive machinery

Table 1 — Overview of hazards and reference to B-Type Standards

Annex A of

EN ISO 14121-1

Hazards, hazardous situations and hazardous events

Situations on hydraulic press breaks

EN ISO

12100-Relevant type B standard

Relevant clause

in this International Standard

4.2.1 4.2.2 4.3 a) 4.3 b) 4.6 4.10 5.1 5.2 5.3 5.5.2 5.5.4 5.5.5 5.5.6 6.1 6.3 6.4 6.5

ISO 13851 ISO 13854 ISO 13855 ISO 13856-2 ISO 13856-3

EN ISO 13857 ISO 14118 ISO 14119 ISO 14120

EN ISO 14122-1

EN ISO 14122-2

EN ISO 14122-3

EN ISO 14122-4 ISO 16156

EN 60204-1

EN 614-1

5.1.1 5.2.6.4 5.2.5.11 5.4.1 5.4.2 5.4.3 5.4.5 5.4.7 5.5.4 5.5.5 5.5.6 5.5.8

A.1 Approach of a moving element to a fixed partA.1 Cutting parts, sharp edges: crushing and shearingA.1

Elastic elements High pressure: fluid injection or ejection Vacuum,

Gravity (stored energy)

Dissipation of accumulated energy inside the machine

A.1 Falling of objects Falling of work-piece

A.1 Moving elements: EntanglementA.1 Rotating elements: Entanglement

A.1

Rough, slippery surface:

slipping, tripping and falling

of persons (related to machinery)

Ejection or spillage of hydraulic fluid Fall of persons during access to/or at/from the work position machines during setting and operation mode.

A.1 Stability

Height from the ground Loss of stability

A.3 Assembly and installationError of fitting During tool workpiece clamping change 5.3 a) 6.1.26.5.1

5.2.6.2 5.5.3 7

A.3 Operation Restarting the machine after stopping/interruption 5.3 b) 2) 4.11.44.11.5

EN 60204-1

2 Electrical hazards A.1 Live parts (direct contact) At electrical equipment during maintenance.

4.3

4.9 5.2 5.3.2 5.5.4 6.4 6.5

EN 60204-1

5.2.3 5.4.2 5.5.2 5.5.9

A.1 Parts which have become live under fault conditions

(indirect contact)

At electrical equipment during setting, machining and maintenance.

A.1 Short-circuit, break up during operation At any mode of operation, in case of penetration of

conducting substances.

overrun monitoring device

device which provides a signal to inhibit further complete stroke when the overrun exceeds the pre-set limit(s)

3.1.24

bending plane

vertical plane passing through the first contact line with the material from the upper tool nearest to the operator

3.2 Abbreviations

TDC Top Dead Centre

AOPD Active Opto-electronic Protective Device

NC Numerical Control

AOPDDR Active Opto-electronic Protective Device responsive to Diffuse Reflection (Scanner)

PLC Programmable logic controller

PES Programmable electronic system

ESPE Electro-sensitive protective equipment

OSSD Output signal switching device

4 List of significant hazards

This clause contains the significant and other relevant hazards, hazardous situations and events (see

EN ISO 14121-1) as far as they are dealt with in this European Standard, identified by risk assessment as

significant for the machines as defined in the scope and which require action to eliminate or reduce the risk This

European Standard deals with:

 significant hazards by defining safety requirements and/ or measures or by reference to relevant type B

standards;

 hazards which are present but not significant e.g general, minor or secondary hazards by reference to

EN ISO 12100-1:2003 and EN ISO 12100-2:2003

These hazards are listed in Table 1 in accordance with EN ISO 14121-1

Particular attention is given to hazards dealing with:

 crushing and shearing between moving tools, beam, back gauges, work-piece supports (see Table 1);

 entanglement on or drawing into moving parts of the machine, guards, motor and drive machinery, mechanical

handling device (see Table 1);

 ejection of machine components of hydraulic system (see Table 1)

Main danger zones are:

 tools area with moving beam, back gauges, work-piece supports;

 mechanical handling device;

 motor and drive machinery

Table 1 — Overview of hazards and reference to B-Type Standards

Annex A of

EN ISO 14121-1

Hazards, hazardous situations and hazardous events

Situations on hydraulic press breaks

EN ISO

12100-Relevant type B standard

Relevant clause

in this International Standard

4.2.1 4.2.2 4.3 a) 4.3 b) 4.6 4.10 5.1 5.2 5.3 5.5.2 5.5.4 5.5.5 5.5.6 6.1 6.3 6.4 6.5

ISO 13851 ISO 13854 ISO 13855 ISO 13856-2 ISO 13856-3

EN ISO 13857 ISO 14118 ISO 14119 ISO 14120

EN ISO 14122-1

EN ISO 14122-2

EN ISO 14122-3

EN ISO 14122-4 ISO 16156

EN 60204-1

EN 614-1

5.1.1 5.2.6.4 5.2.5.11 5.4.1 5.4.2 5.4.3 5.4.5 5.4.7 5.5.4 5.5.5 5.5.6 5.5.8

A.1 Approach of a moving element to a fixed partA.1 Cutting parts, sharp edges: crushing and shearingA.1

Elastic elements High pressure: fluid injection or ejection Vacuum,

Gravity (stored energy)

Dissipation of accumulated energy inside the machine

A.1 Falling of objects Falling of work-piece

A.1 Moving elements: EntanglementA.1 Rotating elements: Entanglement

A.1

Rough, slippery surface:

slipping, tripping and falling

of persons (related to machinery)

Ejection or spillage of hydraulic fluid Fall of persons during access to/or at/from the work position machines during setting and operation mode.

A.1 Stability

Height from the ground Loss of stability

A.3 Assembly and installationError of fitting During tool workpiece clamping change 5.3 a) 6.1.26.5.1

5.2.6.2 5.5.3 7

A.3 Operation Restarting the machine after stopping/interruption 5.3 b) 2) 4.11.44.11.5

EN 60204-1

2 Electrical hazards A.1 Live parts (direct contact) At electrical equipment during maintenance.

4.3

4.9 5.2 5.3.2 5.5.4 6.4 6.5

EN 60204-1

5.2.3 5.4.2 5.5.2 5.5.9

A.1 Parts which have become live under fault conditions

(indirect contact)

At electrical equipment during setting, machining and maintenance.

A.1 Short-circuit, break up during operation At any mode of operation, in case of penetration of

conducting substances.

EN ISO

12100-Relevant type B standard

Relevant clause

in this International Standard

Part 1:

A.4 Failure of control system

– dropping or ejection of moving parts of the machine or of a work- piece clamped by the machine

– failure to stop moving parts

– uncontrolled movements (including speed change) – unintended/unexpected start up

– other hazardous events due to failure(s) or poor design of the control system

– variation of speed of tools (during setting)

5.3 b) 2)

4.2 4.3 4.5 4.11 to 4.13 5.5.2 to 5.5.4 6.3 to 6.5

ISO 4413 ISO 4414

EN 954-1

EN ISO 13849-1

EN ISO 13849-2 ISO 14118

5.1.1 5.2 5.3.3.1.2 5.5.2 5.5.7

A.1 Optical radiation (infrared, visible and ultraviolet),

including laser

At any mode of operation or

8 Ergonomic hazards

A.1 Design or location of indicators and visual

displays units At operators position

4.9

4.2.1 4.7, 4.8 4.11.8 5.2.1 5.3.2.1

A.1 Design, location or identification of control

A.1 Posture, Effort At control devices and during handling of workpiece

tools and machine parts.

Hazards, hazardous situations and hazardous events

Situations on

Relevant clause

in this International Standard A.1 Visibility, Local lighting At any mode of operation or in maintenance situation EN 1837

9 Hazards associated with environment in which the machine is used A.1 Electromagnetic disturbances At NC control equipment during all modes of

operation and maintenance

5.3 b) 2)

4.12.1 6.5.1 b)

5.2 5.5.2

A.4 Human errors human behaviour

Workstation and/or work process design

Inadequate consideration of hand- arm or

foot-leg anatomy

4.9

4.2.1 4.7 4.8 4.11 5.5 6.3 to 6.6

EN 894-1

EN 849-2

EN 849-3

5.2.2 5.2.5.11 5.3.11

5 Safety requirements and/or measures 5.1 Protection of mechanical hazards

5.1.1 Description of the safeguarding of access to moving parts 5.1.1.1 General

The major danger zones at hydraulic press brakes are the tools, associated area and ancillary loading and unloading devices which are an integral part of the machine Preventive measures shall be taken to deal with the relevant hazards

Safeguarding measures described in EN ISO 12100-1 and EN ISO 12100-2 which are appropriate for the protection of any operator at the tools are listed below Designers, manufacturers and suppliers shall select the safeguarding methods which reduce the risks as far as possible, considering the significant hazards (see Table 1) and the mode of production

The selected combination of safeguarding methods shall protect all exposed persons, i.e those who can gain access to the danger zone during operation, setting, maintenance, cleaning and inspection activities

Access to the danger zone(s) shall be prevented by one or a combination of the following safeguarding measures

5.1.1.2 Fixed enclosing guards

Fixed enclosing guards shall comply with EN 953 They shall be firmly secured to the machine, another rigid structure or the floor Any openings in the guards or between the guard and the machine shall meet the requirements of EN ISO 13857:2008, Table 4

5.1.1.3 Interlocking guards with or without guard locking

Interlocking guards shall comply with EN 953 and prevent, in conjunction with fixed guards, access to the danger zone, during any dangerous movement Initiation of the dangerous movement shall be prevented until the guard is closed The associated interlocking devices shall be designed and constructed in accordance with 6.2.1 of EN 1088:1995, for occasional access and with 6.2.2 of EN 1088:1995, for frequent access

Interlocking guards without guard locking shall be placed in such a position that the operator does not have time to reach the danger zone before any dangerous movement has ceased (see EN 999 and EN ISO 13857)

EN ISO

12100-Relevant type B standard

Relevant clause

in this International

machine or of a piece clamped by the

work-machine – failure to stop moving

parts – uncontrolled movements

(including speed change)

– unintended/unexpected start up

– other hazardous events due to failure(s) or poor

design of the control system

– variation of speed of tools (during setting)

5.3 b) 2)

4.2 4.3 4.5

4.11 to 4.13

5.5.2 to

5.5.4 6.3 to

6.5

ISO 4413 ISO 4414

EN 954-1

EN ISO 13849-1

EN ISO 13849-2 ISO 14118

5.3.2.1 5.4.5

6.5.1 c)

5.1.1 5.2

5.3.3.1.2 5.5.2

A.1 Design or location of indicators and visual

displays units At operators position

4.9

4.2.1 4.7,

4.8 4.11.8

5.2.1 5.3.2.1

A.1 Design, location or identification of control

A.1 Posture, Effort At control devices and during handling of workpiece

tools and machine parts.

anatomy at workpiece or tool exchange.

Hazards, hazardous situations and hazardous events

Situations on

Relevant clause

in this International Standard A.1 Visibility, Local lighting At any mode of operation or in maintenance situation EN 1837

9 Hazards associated with environment in which the machine is used A.1 Electromagnetic disturbances At NC control equipment during all modes of

operation and maintenance

5.3 b) 2)

4.12.1 6.5.1 b)

5.2 5.5.2

A.4 Human errors human behaviour

Workstation and/or work process design

Inadequate consideration of hand- arm or

foot-leg anatomy

4.9

4.2.1 4.7 4.8 4.11 5.5 6.3 to 6.6

EN 894-1

EN 849-2

EN 849-3

5.2.2 5.2.5.11 5.3.11

5 Safety requirements and/or measures 5.1 Protection of mechanical hazards

5.1.1 Description of the safeguarding of access to moving parts 5.1.1.1 General

The major danger zones at hydraulic press brakes are the tools, associated area and ancillary loading and unloading devices which are an integral part of the machine Preventive measures shall be taken to deal with the relevant hazards

Safeguarding measures described in EN ISO 12100-1 and EN ISO 12100-2 which are appropriate for the protection of any operator at the tools are listed below Designers, manufacturers and suppliers shall select the safeguarding methods which reduce the risks as far as possible, considering the significant hazards (see Table 1) and the mode of production

The selected combination of safeguarding methods shall protect all exposed persons, i.e those who can gain access to the danger zone during operation, setting, maintenance, cleaning and inspection activities

Access to the danger zone(s) shall be prevented by one or a combination of the following safeguarding measures

5.1.1.2 Fixed enclosing guards

Fixed enclosing guards shall comply with EN 953 They shall be firmly secured to the machine, another rigid structure or the floor Any openings in the guards or between the guard and the machine shall meet the requirements of EN ISO 13857:2008, Table 4

5.1.1.3 Interlocking guards with or without guard locking

Interlocking guards shall comply with EN 953 and prevent, in conjunction with fixed guards, access to the danger zone, during any dangerous movement Initiation of the dangerous movement shall be prevented until the guard is closed The associated interlocking devices shall be designed and constructed in accordance with 6.2.1 of EN 1088:1995, for occasional access and with 6.2.2 of EN 1088:1995, for frequent access

Interlocking guards without guard locking shall be placed in such a position that the operator does not have time to reach the danger zone before any dangerous movement has ceased (see EN 999 and EN ISO 13857)

5.1.1.4 ESPE using AOPD

5.1.1.4.1 Light curtain

ESPE using AOPDs in the form of light curtain shall comply with the following:

a) light curtains shall be in accordance with EN 61496-1 and be designed and constructed according to

CLC/TS 61496-2;

b) access to the danger zone shall only be possible through the detection zone of the light curtain Additional

safeguarding shall prevent access to the danger zone from any other direction;

c) an additional safeguarding shall be provided to ensure that no hazardous movement is possible when

standing in position between the light curtain and the danger zone of the press brake The gap shall be

equal to or less than 75 mm (see 5 1.1.4.2);

d) it shall not be possible to initiate any dangerous movement while any part of the body is interrupting the

light curtain, except when using automatically alternating safeguarding methods (see 5.1.1.4.3);

e) the means of resetting shall be positioned so that there is a clear view of the whole hazardous zone

When more than one hazardous zone is protected with a protective device, a reset control device shall be

provided for each protective device For the requirements of the resetting function, see 5.2.2 of

EN ISO 13849-1:2008;

f) blanking may only be incorporated into the AOPD as long as the safety distance is such as to ensure that

it is not possible to reach the danger zone (see A.1) It shall not be possible for the user to increase the

blanking range

The correction of the minimum distance is not required if the following conditions are fulfilled:

 only one zone is blanked;

 the detection capability of the light curtain at the blanked zone is equal or less than 30 mm;

 the detection capability in the rest of the area is equal or less than 14 mm;

 the safety distance is equal or greater than 150 mm;

 no possibility to initiate cycles using the light curtain

g) Reflective surfaces in the detection plane of the AOPD (e.g light curtain) can influence the detection

capability; the recommendation in the technical documentation of the ESPE manufacturer shall be applied

Where the light curtain operates by reflecting the transmitted light back along its own path and additional

reflector(s) are placed within the detection zone, then the configuration of the additional reflector(s) shall

not allow an item of thickness equal to or greater than the specified test piece size (see

CLC/TS 61496-2:2006, 4.1.2) to be undetected by the light curtain within the whole of the detection zone,

unless other measures are taken to ensure that it is not possible to reach the danger zone

h) where the AOPD is also used for cycle initiation using either single or double break, the following

additional conditions shall be fulfilled:

1) the detection capability shall not exceed 30 mm (see also Annex A);

2) if, in the front of the press brake, additional guards are needed, they shall either be permanently

fixed guards (e.g by welding) or interlocking guards

(

5) the facility to initiate the press brake motion upon clearing of the curtain shall be limited to the set time; this pre-set time shall not be capable of exceeding 30 s starting from the end of the previous operating cycle The light curtain shall be required to be manually reset, if the pre-set time has been exceeded;

pre-6) if there is more than one light curtain safeguarding the press brake, only one of them shall be selectable for cycle initiation at any one time;

7) technical measures shall be taken to ensure that the stroke is only initiated after an intrusion into the protection field of at least 100 ms and releasing of the protection field;

8) commonly two possibilities for starting sequences are made available:

 intrusion and releasing of the protection field, and subsequent actuation of the reset switch;

 pressing of the reset switch, and subsequent intrusion and releasing of the protection field;i) switching off the light curtain by the selector switch shall also switch off its indicator lights

5.1.1.4.2 Size and positioning of light curtains

Light curtains shall be positioned in the following configurations:

 vertical format, see 5.1.1.4.2 a);

 horizontal format, see 5.1.1.4.2 b);

 angled format, see 5.1.1.4.2 c);

 a combination of formats (see 5.1.1.4.2 d)

For up stroking press brakes, the position of the bed is measured at its lowest point:

a) vertical format light curtains shall be configured as shown in Figure 2 The minimum effective vertical

height of the detection zone of the light curtain shall be 800 mm, where the height of the bed, a, is

850 mm or more If the height of the bed is below 850 mm, the detection zone of the light curtain shall

need to increase in length accordingly The minimum vertical overlapping distance, b, between the bed

and the bottom edge of detection zone of the the light curtain shall be at least 50 mm (see Figure 2)

The minimum height, c, of the top edge of the detection zone of the light curtain shall be 1 600 mm above the reference plane The minimum height c = 1 600 mm or the minimum height of the detection zone

800 mm of the light curtain may be reduced only if additional safeguarding prevents any access to the danger zone

The light curtain object detection capability shall be 14 mm or less if no additional distance, C, is used to

achieve the required safety distance (see Annex A)

The minimum distance, S, shall be calculated according to the formula given in Annex A, but shall never

be less than 100 mm

Where the vertical format light curtain cannot be placed against the press brake frame, then the resulting gap shall be guarded by:

5.1.1.4 ESPE using AOPD

5.1.1.4.1 Light curtain

ESPE using AOPDs in the form of light curtain shall comply with the following:

a) light curtains shall be in accordance with EN 61496-1 and be designed and constructed according to

CLC/TS 61496-2;

b) access to the danger zone shall only be possible through the detection zone of the light curtain Additional

safeguarding shall prevent access to the danger zone from any other direction;

c) an additional safeguarding shall be provided to ensure that no hazardous movement is possible when

standing in position between the light curtain and the danger zone of the press brake The gap shall be

equal to or less than 75 mm (see 5 1.1.4.2);

d) it shall not be possible to initiate any dangerous movement while any part of the body is interrupting the

light curtain, except when using automatically alternating safeguarding methods (see 5.1.1.4.3);

e) the means of resetting shall be positioned so that there is a clear view of the whole hazardous zone

When more than one hazardous zone is protected with a protective device, a reset control device shall be

provided for each protective device For the requirements of the resetting function, see 5.2.2 of

EN ISO 13849-1:2008;

f) blanking may only be incorporated into the AOPD as long as the safety distance is such as to ensure that

it is not possible to reach the danger zone (see A.1) It shall not be possible for the user to increase the

blanking range

The correction of the minimum distance is not required if the following conditions are fulfilled:

 only one zone is blanked;

 the detection capability of the light curtain at the blanked zone is equal or less than 30 mm;

 the detection capability in the rest of the area is equal or less than 14 mm;

 the safety distance is equal or greater than 150 mm;

 no possibility to initiate cycles using the light curtain

g) Reflective surfaces in the detection plane of the AOPD (e.g light curtain) can influence the detection

capability; the recommendation in the technical documentation of the ESPE manufacturer shall be applied

Where the light curtain operates by reflecting the transmitted light back along its own path and additional

reflector(s) are placed within the detection zone, then the configuration of the additional reflector(s) shall

not allow an item of thickness equal to or greater than the specified test piece size (see

CLC/TS 61496-2:2006, 4.1.2) to be undetected by the light curtain within the whole of the detection zone,

unless other measures are taken to ensure that it is not possible to reach the danger zone

h) where the AOPD is also used for cycle initiation using either single or double break, the following

additional conditions shall be fulfilled:

1) the detection capability shall not exceed 30 mm (see also Annex A);

2) if, in the front of the press brake, additional guards are needed, they shall either be permanently

fixed guards (e.g by welding) or interlocking guards

(

5) the facility to initiate the press brake motion upon clearing of the curtain shall be limited to the set time; this pre-set time shall not be capable of exceeding 30 s starting from the end of the previous operating cycle The light curtain shall be required to be manually reset, if the pre-set time has been exceeded;

pre-6) if there is more than one light curtain safeguarding the press brake, only one of them shall be selectable for cycle initiation at any one time;

7) technical measures shall be taken to ensure that the stroke is only initiated after an intrusion into the protection field of at least 100 ms and releasing of the protection field;

8) commonly two possibilities for starting sequences are made available:

 intrusion and releasing of the protection field, and subsequent actuation of the reset switch;

 pressing of the reset switch, and subsequent intrusion and releasing of the protection field;i) switching off the light curtain by the selector switch shall also switch off its indicator lights

5.1.1.4.2 Size and positioning of light curtains

Light curtains shall be positioned in the following configurations:

 vertical format, see 5.1.1.4.2 a);

 horizontal format, see 5.1.1.4.2 b);

 angled format, see 5.1.1.4.2 c);

 a combination of formats (see 5.1.1.4.2 d)

For up stroking press brakes, the position of the bed is measured at its lowest point:

a) vertical format light curtains shall be configured as shown in Figure 2 The minimum effective vertical

height of the detection zone of the light curtain shall be 800 mm, where the height of the bed, a, is

850 mm or more If the height of the bed is below 850 mm, the detection zone of the light curtain shall

need to increase in length accordingly The minimum vertical overlapping distance, b, between the bed

and the bottom edge of detection zone of the the light curtain shall be at least 50 mm (see Figure 2)

The minimum height, c, of the top edge of the detection zone of the light curtain shall be 1 600 mm above the reference plane The minimum height c = 1 600 mm or the minimum height of the detection zone

800 mm of the light curtain may be reduced only if additional safeguarding prevents any access to the danger zone

The light curtain object detection capability shall be 14 mm or less if no additional distance, C, is used to

achieve the required safety distance (see Annex A)

The minimum distance, S, shall be calculated according to the formula given in Annex A, but shall never

be less than 100 mm

Where the vertical format light curtain cannot be placed against the press brake frame, then the resulting gap shall be guarded by:

 either fixed or interlocking guards; or

 additional light beams

The gap between bars in a fixed guard, or between the frame and the edge of the fixed or interlocking

guard or single light beam shall follow the minimum distances set out in EN ISO 13857

Key

1 Sheet support

2 Additional light beam(s)/guard(s)/curtain(s)

3 Max distance (see text) reference plan

NOTE Side and rear guards omitted for the purpose of this figure

a Height of the bed to operator's stand

b Overlapping distance

c Height of top edge of the detection zone of the light curtain

d Safety distance

Figure 2 — Configuration of the vertical format light curtain

b) horizontal format light curtains shall be configured as shown in Figure 3 when the height of the bed, a, is

not less than 800 mm or more than 1 200 mm The minimum overlapping distance b between the bed and

the bottom edge of the light curtain shall be 50 mm

Where the overall response time is 200 ms or less, the minimum distance, d, shall be at least 1 000 mm

Where the overall response time exceeds 200 ms, 20 mm shall be added to the figure of 1 000 mm for

each additional 10 ms

The detection capability shall be 40 mm or less from the bending line to a distance of 550 mm Beyond

550 mm, the detection capability shall not exceed 75 mm, but see 5.1.1.4.2 c) where an adjustable

angled light curtain is used

Where the horizontal format light curtain cannot be placed against the press brake frame, then the resulting gap shall be guarded by

 either fixed or interlocking guards; or

 additional light beams

The gap between bars in a fixed guard, or between the bed and the edge of the fixed or interlocking guard or single light beam shall follow the minimum distances set out in EN ISO 13857

Key

1 Sheet support

2 Max distance (see text)

3 Possible alternative position of light curtain

4 Reference plan

NOTE Side and rear guards omitted for the purpose of this figure

a Height of the bed

b Overlapping distance

c Height of the detection zone of the light curtain

d Safety distance

Figure 3 — Configuration of the horizontal format light curtain

c) Where an angled format light curtain is used, the light curtain in the vertical and horizontal positions shall meet the dimensional criteria laid down in 5.1.1.4.2 a) and 5.1.1.4.2 b) respectively (see Figures 2 and 3)

If the light curtain can be adjusted to less than 45° from the vertical position, the detection capability shall

be in accordance with Table A.1

d) When a combination of light curtains is used, the formats shall achieve the same level of protection as required in 5.1.1.4.2 a) and 5.1.1.4.2 b) above

NOTE In relation to muting, see 5.2.5.8

 either fixed or interlocking guards; or

 additional light beams

The gap between bars in a fixed guard, or between the frame and the edge of the fixed or interlocking

guard or single light beam shall follow the minimum distances set out in EN ISO 13857

Key

1 Sheet support

2 Additional light beam(s)/guard(s)/curtain(s)

3 Max distance (see text) reference plan

NOTE Side and rear guards omitted for the purpose of this figure

a Height of the bed to operator's stand

b Overlapping distance

c Height of top edge of the detection zone of the light curtain

d Safety distance

Figure 2 — Configuration of the vertical format light curtain

b) horizontal format light curtains shall be configured as shown in Figure 3 when the height of the bed, a, is

not less than 800 mm or more than 1 200 mm The minimum overlapping distance b between the bed and

the bottom edge of the light curtain shall be 50 mm

Where the overall response time is 200 ms or less, the minimum distance, d, shall be at least 1 000 mm

Where the overall response time exceeds 200 ms, 20 mm shall be added to the figure of 1 000 mm for

each additional 10 ms

The detection capability shall be 40 mm or less from the bending line to a distance of 550 mm Beyond

550 mm, the detection capability shall not exceed 75 mm, but see 5.1.1.4.2 c) where an adjustable

angled light curtain is used

Where the horizontal format light curtain cannot be placed against the press brake frame, then the resulting gap shall be guarded by

 either fixed or interlocking guards; or

 additional light beams

The gap between bars in a fixed guard, or between the bed and the edge of the fixed or interlocking guard or single light beam shall follow the minimum distances set out in EN ISO 13857

Key

1 Sheet support

2 Max distance (see text)

3 Possible alternative position of light curtain

4 Reference plan

NOTE Side and rear guards omitted for the purpose of this figure

a Height of the bed

b Overlapping distance

c Height of the detection zone of the light curtain

d Safety distance

Figure 3 — Configuration of the horizontal format light curtain

c) Where an angled format light curtain is used, the light curtain in the vertical and horizontal positions shall meet the dimensional criteria laid down in 5.1.1.4.2 a) and 5.1.1.4.2 b) respectively (see Figures 2 and 3)

If the light curtain can be adjusted to less than 45° from the vertical position, the detection capability shall

be in accordance with Table A.1

d) When a combination of light curtains is used, the formats shall achieve the same level of protection as required in 5.1.1.4.2 a) and 5.1.1.4.2 b) above

NOTE In relation to muting, see 5.2.5.8

5.1.1.4.3 Automatically alternating safeguarding methods

For the use of automatically alternating safeguarding methods with a foot pedal for cycle initiation, the

following conditions shall apply:

a) Alternating starting conditions at the chosen top dead centre (TDC) are:

1) the active light curtain is not interrupted: high closing speed, or

2) the light curtain is interrupted: only slow closing speed

b) Interruption of the active light curtain during the high closing speed or release of the foot pedal shall lead

to:

1) Stop; or

2) reverse to the chosen top dead centre (TDC)

c) Restart after interruption: starting conditions as at the chosen top dead centre (TDC) (see 5.2.6.2)

Muting function may be also provided (see 5.2.5.8)

5.1.1.5 Laser actuated AOPD

The laser actuated AOPD shall be suitable for the bed length of the machine, the thermal influences, the

overrun performances and optical reflections expected at the press brake, see also 7.2.2 o)

These devices are designed specifically for “V” type tools and the manufacturer shall provide instructions on

which tools can be used If the tool creates crushing hazards outside the detection zone defined in 5.1.1.5 b)

(e.g a non “V” type tool is used), additional safety measures shall be provided to achieve at least the same

level of protection as defined for “V” type tools in 5.1.1.5 b)

EXAMPLE move or increase the detection zone, additional detection zones, additional safety systems, earlier slow

speed to suit crushing hazards

The laser actuated AOPD shall comply with the following:

a) Laser actuated AOPD shall be in accordance with EN 61496-1

b) The detection zone provided by this device shall be placed near the upper tool (e.g the laser actuated

AOPD is moving with the beam for downstroking press brake) This protective zone shall comply with the

following:

1) A detection zone with a detection capability of 14 mm shall be provided that extend in the vertical

plane directly under the centre line of the upper tool but not more than 2,5 mm behind (bending line)

so as to pass the tests in Annex G

2) This zone shall also extend forward of the bending plane by at least 15 mm

c) Switching off the laser actuated AOPD by the selector switch shall also switch off the indicators lights

d) Muting of the entire protective zone described in b.1) and b.2) above or blanking any part of this detection

zone that affects the test in Annex G during the closing stroke of the press brake shall only be possible if

the closing speed is already reduced to 10 mm/s or less in conjunction with a three positions hold-to-run

control device (see 5.1.1.6) In such situation, means shall be provided to ensure that the speed does not

exceed 10 mm/s, or to stop the stroke if the speed increases

e) For a special mode of operation, e.g box bending, the following measures shall be taken to blank only the detection zone described in 5.1.1.5, b), 2) with 5.1.1.5, b), 1) still active:

1) Means of selection shall be provided for this special mode of operation;

2) A suitable indicator, active when the detection zone is blanked, shall be provided;

3) Blanking of this detection zone during the closing stroke is possible if the closing speed is reduced

to 10 mm/s or less, in conjunction with a hold-to-run control device;

4) This special mode of operation shall be automatically de-activated:

 at each power on of the machine;

 after a mode selection change;

 after a change of program of the numerical control; and

 within 8 hours running time;

5) Blanking of this detection zone is also possible when the stroke is required in fast speed (more than 10 mm/s), given that the blanking function may be activated before each bending stroke by the control system (e.g by information coming from the numerical control to determine the sequence of blanked and non blanked strokes) For each of the strokes requiring the blanking, the operator shall have a separate confirming action (e.g push button or extra depression of foot pedal) before the blanking is permitted

f) There shall be indicators of the mode of operation of laser actuated AOPD (e.g box bending mode) visible by the operator

g) The position setting of laser actuated AOPD shall be lockable against unexpected change, e.g due to vibrations, mechanical shock

h) Access to the tool zone shall only be possible from the front side of the press brake The laser actuated AOPD shall prevent in conjunction with other safeguarding access to the danger zone from any other direction

Any interruption of the detection zone shall result in a stop or inversion of the movement of the beam The hold-to-run control device shall be reactivated to initiate a further closing stroke of the press brake beam

If the detection zone remains interrupted it shall only be possible to run the press brake with a closing speed equal to or less than 10 mm/s in conjunction with a hold-to-run control device (see 5.1.1.6)

i) It shall not be possible to initiate travel faster than 10 mm/s while any interruption exists in the detection zone appropriate to the selected mode of operation

j) The means of resetting shall be so positioned that from that position there is a clear view of the danger zone There shall be only one reset control device for the laser actuated AOPD system

k) The press brake stroke shall be controlled by a three positions hold-to-run control device

l) An automatic press brake overrun monitoring function shall be provided

m) The design of parts other than those protected by the AOPD (e.g moving tool support dies for crushed bends) shall be such that no trapping point is created during the closing and opening movement If this requirement cannot be fulfilled, complementary protection measures shall be taken

n) Additional safeguarding shall be provided to prevent any hazard arising due to the laser actuated AOPD moving with the beam (e.g between the laser actuated AOPD and fixed parts of the press brake)

5.1.1.4.3 Automatically alternating safeguarding methods

For the use of automatically alternating safeguarding methods with a foot pedal for cycle initiation, the

following conditions shall apply:

a) Alternating starting conditions at the chosen top dead centre (TDC) are:

1) the active light curtain is not interrupted: high closing speed, or

2) the light curtain is interrupted: only slow closing speed

b) Interruption of the active light curtain during the high closing speed or release of the foot pedal shall lead

to:

1) Stop; or

2) reverse to the chosen top dead centre (TDC)

c) Restart after interruption: starting conditions as at the chosen top dead centre (TDC) (see 5.2.6.2)

Muting function may be also provided (see 5.2.5.8)

5.1.1.5 Laser actuated AOPD

The laser actuated AOPD shall be suitable for the bed length of the machine, the thermal influences, the

overrun performances and optical reflections expected at the press brake, see also 7.2.2 o)

These devices are designed specifically for “V” type tools and the manufacturer shall provide instructions on

which tools can be used If the tool creates crushing hazards outside the detection zone defined in 5.1.1.5 b)

(e.g a non “V” type tool is used), additional safety measures shall be provided to achieve at least the same

level of protection as defined for “V” type tools in 5.1.1.5 b)

EXAMPLE move or increase the detection zone, additional detection zones, additional safety systems, earlier slow

speed to suit crushing hazards

The laser actuated AOPD shall comply with the following:

a) Laser actuated AOPD shall be in accordance with EN 61496-1

b) The detection zone provided by this device shall be placed near the upper tool (e.g the laser actuated

AOPD is moving with the beam for downstroking press brake) This protective zone shall comply with the

following:

1) A detection zone with a detection capability of 14 mm shall be provided that extend in the vertical

plane directly under the centre line of the upper tool but not more than 2,5 mm behind (bending line)

so as to pass the tests in Annex G

2) This zone shall also extend forward of the bending plane by at least 15 mm

c) Switching off the laser actuated AOPD by the selector switch shall also switch off the indicators lights

d) Muting of the entire protective zone described in b.1) and b.2) above or blanking any part of this detection

zone that affects the test in Annex G during the closing stroke of the press brake shall only be possible if

the closing speed is already reduced to 10 mm/s or less in conjunction with a three positions hold-to-run

control device (see 5.1.1.6) In such situation, means shall be provided to ensure that the speed does not

exceed 10 mm/s, or to stop the stroke if the speed increases

e) For a special mode of operation, e.g box bending, the following measures shall be taken to blank only the detection zone described in 5.1.1.5, b), 2) with 5.1.1.5, b), 1) still active:

1) Means of selection shall be provided for this special mode of operation;

2) A suitable indicator, active when the detection zone is blanked, shall be provided;

3) Blanking of this detection zone during the closing stroke is possible if the closing speed is reduced

to 10 mm/s or less, in conjunction with a hold-to-run control device;

4) This special mode of operation shall be automatically de-activated:

 at each power on of the machine;

 after a mode selection change;

 after a change of program of the numerical control; and

 within 8 hours running time;

5) Blanking of this detection zone is also possible when the stroke is required in fast speed (more than 10 mm/s), given that the blanking function may be activated before each bending stroke by the control system (e.g by information coming from the numerical control to determine the sequence of blanked and non blanked strokes) For each of the strokes requiring the blanking, the operator shall have a separate confirming action (e.g push button or extra depression of foot pedal) before the blanking is permitted

f) There shall be indicators of the mode of operation of laser actuated AOPD (e.g box bending mode) visible by the operator

g) The position setting of laser actuated AOPD shall be lockable against unexpected change, e.g due to vibrations, mechanical shock

h) Access to the tool zone shall only be possible from the front side of the press brake The laser actuated AOPD shall prevent in conjunction with other safeguarding access to the danger zone from any other direction

Any interruption of the detection zone shall result in a stop or inversion of the movement of the beam The hold-to-run control device shall be reactivated to initiate a further closing stroke of the press brake beam

If the detection zone remains interrupted it shall only be possible to run the press brake with a closing speed equal to or less than 10 mm/s in conjunction with a hold-to-run control device (see 5.1.1.6)

i) It shall not be possible to initiate travel faster than 10 mm/s while any interruption exists in the detection zone appropriate to the selected mode of operation

j) The means of resetting shall be so positioned that from that position there is a clear view of the danger zone There shall be only one reset control device for the laser actuated AOPD system

k) The press brake stroke shall be controlled by a three positions hold-to-run control device

l) An automatic press brake overrun monitoring function shall be provided

m) The design of parts other than those protected by the AOPD (e.g moving tool support dies for crushed bends) shall be such that no trapping point is created during the closing and opening movement If this requirement cannot be fulfilled, complementary protection measures shall be taken

n) Additional safeguarding shall be provided to prevent any hazard arising due to the laser actuated AOPD moving with the beam (e.g between the laser actuated AOPD and fixed parts of the press brake)

o) The optical design of a laser actuated AOPD shall be in a manner that no optical bypassing can occur on

reflecting surfaces

p) The operator shall be able to detect any person within the dangerous areas of the machine

5.1.1.6 Hold to run control

Provision shall be made to ensure that unintended start-up and inability to stop due to a short circuit in the

cable connecting the hold-to-run control device to the control system is prevented

Where a hold-to-run control device is usable, the press brake shall be operated with slow closing speed

(≤ 10 mm/s) or in conjunction with an AOPD (see 5.1.1.4)

One hold to run control shall be active for each operator if more than one operator is working at the machine

The hold-to-run control shall be one of the following:

a) A foot pedal with a single actuator having the following positions:

 1stposition: stop;

 2ndposition: run;

 3rdposition: stop

Actuating the pedal to the third position or releasing it to the first position can initiate an opening stroke

except if the sheet is already being pressed

After operating the actuator over a pressure point in 3rd position, a restart shall only be possible after

returning the actuator to 1stposition Where the hold-to-run device is a foot pedal, the 3rdposition shall be

reached passing a pressure point The force required shall not exceed 350 N

b) A two-hand control which shall comply to EN 574, see Table 2)

Releasing the two-hand control can initiate an opening stroke except if the sheet is already being pressed

5.1.1.7 Scanner systems

Scanner systems may be used as trip and/or presence sensing device for the press brake danger zones

under the following conditions:

a) AOPDDR shall comply with EN 61496-1 and CLC/TS 61496-3;

 Access to the danger zone shall only be possible through the detection zone of the scanner device

(AOPDDR) Otherwise additional safeguarding shall prevent access to the danger zone from any

other point or direction;

 The detection zone shall always fit with the danger zones, the shadow zones (e.g behind fixed

objects) shall be avoided in the danger zones Where the detection zone is programmable, the

program and setting of the detection zone shall only be accessible through a password or a tool;

 The detection capability of the AOPDDR shall be equal or less than 70 mm in any place of the

danger zones (e.g it shall not be possible to stand between the detection zone and the press brake

bed without detection, see Figure 4);

 The AOPDDR shall not be capable of cycle initiation;

 It shall not be possible to initiate any dangerous movement while anybody or parts of the body e.g legs are detected in the detection zone of the AOPDDR;

 The minimum safety distances shall be calculated in accordance with EN 999:1998, 6.2;

b) After any detection, a manual restart function shall be activated, additional reset is not required (since the whole danger zone is monitored)

H Height of the scanner field

Figure 4 — Example of press brake presence sensing using scanner

The value of "a" shall be small enough to ensure detection at distances up to and including "S" plus the tolerance zone The value of "a" shall be equal or less than 70 mm

5.1.1.8 ESPE using AOPD when used in automatic cycle as a trip device

ESPE using AOPD shall be in accordance with EN 61496-1 and CLC/TS 61496-2 It shall be a system using multiple beams (minimum two beams, separate or in form of a light curtain)

EN 999:1998, Clause 6 shall apply, especially to calculate the minimum distance at which the ESPE using AOPD shall be placed from the danger zone

The ESPE using AOPD shall not be capable of cycle initiation

Access to the danger zone shall only be possible through the detection zone of the ESPE using AOPD, otherwise additional safeguarding means shall prevent the access

The means of reset shall be in a fixed position outside the danger zone with a clear view of the complete danger zone and outside the detection zone and not reachable from the inside of the danger zone

o) The optical design of a laser actuated AOPD shall be in a manner that no optical bypassing can occur on

reflecting surfaces

p) The operator shall be able to detect any person within the dangerous areas of the machine

5.1.1.6 Hold to run control

Provision shall be made to ensure that unintended start-up and inability to stop due to a short circuit in the

cable connecting the hold-to-run control device to the control system is prevented

Where a hold-to-run control device is usable, the press brake shall be operated with slow closing speed

(≤ 10 mm/s) or in conjunction with an AOPD (see 5.1.1.4)

One hold to run control shall be active for each operator if more than one operator is working at the machine

The hold-to-run control shall be one of the following:

a) A foot pedal with a single actuator having the following positions:

 1stposition: stop;

 2ndposition: run;

 3rdposition: stop

Actuating the pedal to the third position or releasing it to the first position can initiate an opening stroke

except if the sheet is already being pressed

After operating the actuator over a pressure point in 3rd position, a restart shall only be possible after

returning the actuator to 1stposition Where the hold-to-run device is a foot pedal, the 3rdposition shall be

reached passing a pressure point The force required shall not exceed 350 N

b) A two-hand control which shall comply to EN 574, see Table 2)

Releasing the two-hand control can initiate an opening stroke except if the sheet is already being pressed

5.1.1.7 Scanner systems

Scanner systems may be used as trip and/or presence sensing device for the press brake danger zones

under the following conditions:

a) AOPDDR shall comply with EN 61496-1 and CLC/TS 61496-3;

 Access to the danger zone shall only be possible through the detection zone of the scanner device

(AOPDDR) Otherwise additional safeguarding shall prevent access to the danger zone from any

other point or direction;

 The detection zone shall always fit with the danger zones, the shadow zones (e.g behind fixed

objects) shall be avoided in the danger zones Where the detection zone is programmable, the

program and setting of the detection zone shall only be accessible through a password or a tool;

 The detection capability of the AOPDDR shall be equal or less than 70 mm in any place of the

danger zones (e.g it shall not be possible to stand between the detection zone and the press brake

bed without detection, see Figure 4);

 The AOPDDR shall not be capable of cycle initiation;

 It shall not be possible to initiate any dangerous movement while anybody or parts of the body e.g legs are detected in the detection zone of the AOPDDR;

 The minimum safety distances shall be calculated in accordance with EN 999:1998, 6.2;

b) After any detection, a manual restart function shall be activated, additional reset is not required (since the whole danger zone is monitored)

H Height of the scanner field

Figure 4 — Example of press brake presence sensing using scanner

The value of "a" shall be small enough to ensure detection at distances up to and including "S" plus the tolerance zone The value of "a" shall be equal or less than 70 mm

5.1.1.8 ESPE using AOPD when used in automatic cycle as a trip device

ESPE using AOPD shall be in accordance with EN 61496-1 and CLC/TS 61496-2 It shall be a system using multiple beams (minimum two beams, separate or in form of a light curtain)

EN 999:1998, Clause 6 shall apply, especially to calculate the minimum distance at which the ESPE using AOPD shall be placed from the danger zone

The ESPE using AOPD shall not be capable of cycle initiation

Access to the danger zone shall only be possible through the detection zone of the ESPE using AOPD, otherwise additional safeguarding means shall prevent the access

The means of reset shall be in a fixed position outside the danger zone with a clear view of the complete danger zone and outside the detection zone and not reachable from the inside of the danger zone

Blanking may only be incorporated into the ESPE using AOPD as long as the safety distance is such as to

ensure that it is not possible to reach the danger zone

Setting of the blanking range shall only be accessible through a password or a tool

The press brake shall be stopped if the blanking function of the ESPE using AOPD is activated while the

equipment for which the blanking was necessary has been removed

5.1.2 Location of the safeguarding of access to moving parts

5.1.2.1 Prevention of access from the front

5.1.2.1.1 General

Where a press brake is capable of being manually loaded and/or unloaded the safeguarding system of the

tools area shall not rely solely on the use of fixed enclosing guard(s) It shall always be supplied with one or

more of the safeguarding systems listed in 5.1.1.3 to 5.1.1.6 Additionally, when it is necessary to prevent a

person from standing in the front area of a press brake, a presence sensing protective device shall be used

The device may be an AOPDDR scanner described in 5.1.1.7 or a horizontal light curtain

Where a press brake which allows manual loading and/or unloading is supplied with one or more of the

safeguarding systems listed in 5.1.1.3 to 5.1.1.7 it shall not be possible to operate the press brake at speeds

in excess of 10 mm/s with the safeguarding system disconnected

Press brakes intended to work solely in automatic cycle with automatic loading and unloading shall always be

supplied with one or more of the safeguarding systems listed in 5.1.1.3 or 5.1.1.8 When it is necessary to

prevent a person to enter and/or to stand in the front area of a press brake (e.g to check if nobody is too close

to the press brake dangerous zone when starting the automatic cycle), a presence sensing protective device

shall be used The device may be an AOPDDR scanner described in 5.1.1.7 or a horizontal light curtain If no

access is required for production and setting mode for automatic cycle, the safeguarding system of the tools

relying solely on the use of fixed enclosing guards (see 5.1.1.2) is possible

5.1.2.1.2 Protection against injury caused by the deflection of a protruding workpiece

Means shall be provided to minimise the risk to exposed persons caused by the movement of sheet metal

during the bending process In this regard, the protective device (see 5.1.1) shall be active during the

hazardous closing movements (see 7.2.2 i)) The following measures shall also be taken where reasonably

practicable taking into account the intended use:

a) a facility to reduce the bending speed;

b) a facility to reduce the return speed until the moving part of the tools loses its contact with the work-piece;

c) a facility for non-automatic return of the moving part of the tools, to avoid injury from falling work-pieces

during opening of the tools;

d) the provision of powered work-piece supports and/or handling devices, e.g mechanically linked or

numerically controlled supports

An equivalent level of protection shall be provided for each operator (see 5.1.1.) If the press brake is

designed to be used at slow (equal or less 10 mm/s) closing speed only and with the possibility of more than

one operator, then the press brake shall be provided:

e) either with one hold-to-run control device for each operator;

f) or with a device ensuring an equivalent level of protection for each operator

5.1.2.1.3 Protection against injuries caused by back gauges movement

The operator shall be protected against hazardous movements of automatically operated back gauges, e.g those towards the operator, sidewards and upwards The following measures, either singly or in combination, shall be taken:

a) movement initiation by the operator (i.e no automatic back gauge initiation);

b) the facility to allow the demarcation of a zone in which only reduced speed (less than or equal to 2 m/min)

or limited force (less than or equal to 150 N) movement is possible This demarcation zone shall be arranged so that the reduced speed occurs for at least the last 50 mm of motion to any trapping point (e.g between the back gauges and the correctly positioned work-piece, the back gauge and the tools)

NOTE These two measures may involve the use of a PES

5.1.2.2 Prevention of access from the sides

Press brakes capable of being manually loaded and/or unloaded shall be provided with guards which prevent lateral reach from the sides of the press brake (see Annex E for an example) into the danger zones Any such guard shall be interlocked so that the closing stroke cannot be initiated when the guard is opened, and the closing stroke is stopped if the guard is moved during the stroke These guards shall be interlocked with the machine control system in accordance with EN 1088:1995, 6.2.1

It shall not be possible to stand between the press brake and the closed side guard Opening such interlocking guard shall stop hazardous movements (e.g beam, back gauges, supports, and integral handling devices) If operating the machine is required with one of the interlocked side guards open, a hold-to-run control device used in conjunction with a slow closing speed (equal to or less than 10 mm/s) shall be provided for this operation and the movement of the back gauges shall only be possible at reduced speed (less than or equal

to 2 m/min)

Press brakes intended to work solely in automatic cycle with automatic loading and unloading shall always be supplied with one or more of the safeguarding systems listed in 5.1.1.2, 5.1.1.3 or 5.1.1.8 When it is necessary to prevent a person from entering and/or standing in the side area of a press brake (e.g to check if somebody is too close to the press brake dangerous zone when starting the automatic cycle), AOPDDR as described in 5.1.1.7 may be used as trip and/or presence sensing device Where access is required for production and setting mode for automatic cycle, the safeguarding system of the tools shall not rely solely on the use of fixed enclosing guards (see 5.1.1.2)

5.1.2.3 Prevention of access from the rear

The access to the tools, back gauges and ancillary devices area shall be prevented This shall be done using one or more of the following means:

a) Interlocking guards or interlocking guards in conjunction with fixed guards (see 5.1.1.2 and 5.1.1.3)

b) ESPE using AOPD with separate beams disposed in a vertical plane This shall be a system using at least two separate light beams (see EN 999:1998, 6.1.4 for the positioning of the beams) The required safety distance to the nearest trapping point shall be at least 1 000 mm when three beams are used; atleast 1 200 mm when two beams are used It shall be in accordance with EN 61496-1 and CLC/TC 61496-2 (and see Table 2 for the type) A reset at the rear of the press brake shall be provided.c) AOPDDR as described in 5.1.1.7 Press brakes intended to work solely in automatic cycle with automatic loading and unloading shall always be supplied with one or more of the safeguarding systems listed in 5.1.1.3 or 5.1.1.8 When it is necessary to prevent a person from entering and/or from standing in the rear area of a press brake (e.g to check if somebody is too close to the press brake dangerous zone when starting the automatic cycle), AOPDDR as described in 5.1.1.7 may be used as trip and/or presence sensing device Where access is required for production and setting mode for automatic cycle, the safeguarding system of the tools shall not rely solely on the use of fixed enclosing guards (see 5.1.1.2)

Blanking may only be incorporated into the ESPE using AOPD as long as the safety distance is such as to

ensure that it is not possible to reach the danger zone

Setting of the blanking range shall only be accessible through a password or a tool

The press brake shall be stopped if the blanking function of the ESPE using AOPD is activated while the

equipment for which the blanking was necessary has been removed

5.1.2 Location of the safeguarding of access to moving parts

5.1.2.1 Prevention of access from the front

5.1.2.1.1 General

Where a press brake is capable of being manually loaded and/or unloaded the safeguarding system of the

tools area shall not rely solely on the use of fixed enclosing guard(s) It shall always be supplied with one or

more of the safeguarding systems listed in 5.1.1.3 to 5.1.1.6 Additionally, when it is necessary to prevent a

person from standing in the front area of a press brake, a presence sensing protective device shall be used

The device may be an AOPDDR scanner described in 5.1.1.7 or a horizontal light curtain

Where a press brake which allows manual loading and/or unloading is supplied with one or more of the

safeguarding systems listed in 5.1.1.3 to 5.1.1.7 it shall not be possible to operate the press brake at speeds

in excess of 10 mm/s with the safeguarding system disconnected

Press brakes intended to work solely in automatic cycle with automatic loading and unloading shall always be

supplied with one or more of the safeguarding systems listed in 5.1.1.3 or 5.1.1.8 When it is necessary to

prevent a person to enter and/or to stand in the front area of a press brake (e.g to check if nobody is too close

to the press brake dangerous zone when starting the automatic cycle), a presence sensing protective device

shall be used The device may be an AOPDDR scanner described in 5.1.1.7 or a horizontal light curtain If no

access is required for production and setting mode for automatic cycle, the safeguarding system of the tools

relying solely on the use of fixed enclosing guards (see 5.1.1.2) is possible

5.1.2.1.2 Protection against injury caused by the deflection of a protruding workpiece

Means shall be provided to minimise the risk to exposed persons caused by the movement of sheet metal

during the bending process In this regard, the protective device (see 5.1.1) shall be active during the

hazardous closing movements (see 7.2.2 i)) The following measures shall also be taken where reasonably

practicable taking into account the intended use:

a) a facility to reduce the bending speed;

b) a facility to reduce the return speed until the moving part of the tools loses its contact with the work-piece;

c) a facility for non-automatic return of the moving part of the tools, to avoid injury from falling work-pieces

during opening of the tools;

d) the provision of powered work-piece supports and/or handling devices, e.g mechanically linked or

numerically controlled supports

An equivalent level of protection shall be provided for each operator (see 5.1.1.) If the press brake is

designed to be used at slow (equal or less 10 mm/s) closing speed only and with the possibility of more than

one operator, then the press brake shall be provided:

e) either with one hold-to-run control device for each operator;

f) or with a device ensuring an equivalent level of protection for each operator

5.1.2.1.3 Protection against injuries caused by back gauges movement

The operator shall be protected against hazardous movements of automatically operated back gauges, e.g those towards the operator, sidewards and upwards The following measures, either singly or in combination, shall be taken:

a) movement initiation by the operator (i.e no automatic back gauge initiation);

b) the facility to allow the demarcation of a zone in which only reduced speed (less than or equal to 2 m/min)

or limited force (less than or equal to 150 N) movement is possible This demarcation zone shall be arranged so that the reduced speed occurs for at least the last 50 mm of motion to any trapping point (e.g between the back gauges and the correctly positioned work-piece, the back gauge and the tools)

NOTE These two measures may involve the use of a PES

5.1.2.2 Prevention of access from the sides

Press brakes capable of being manually loaded and/or unloaded shall be provided with guards which prevent lateral reach from the sides of the press brake (see Annex E for an example) into the danger zones Any such guard shall be interlocked so that the closing stroke cannot be initiated when the guard is opened, and the closing stroke is stopped if the guard is moved during the stroke These guards shall be interlocked with the machine control system in accordance with EN 1088:1995, 6.2.1

It shall not be possible to stand between the press brake and the closed side guard Opening such interlocking guard shall stop hazardous movements (e.g beam, back gauges, supports, and integral handling devices) If operating the machine is required with one of the interlocked side guards open, a hold-to-run control device used in conjunction with a slow closing speed (equal to or less than 10 mm/s) shall be provided for this operation and the movement of the back gauges shall only be possible at reduced speed (less than or equal

to 2 m/min)

Press brakes intended to work solely in automatic cycle with automatic loading and unloading shall always be supplied with one or more of the safeguarding systems listed in 5.1.1.2, 5.1.1.3 or 5.1.1.8 When it is necessary to prevent a person from entering and/or standing in the side area of a press brake (e.g to check if somebody is too close to the press brake dangerous zone when starting the automatic cycle), AOPDDR as described in 5.1.1.7 may be used as trip and/or presence sensing device Where access is required for production and setting mode for automatic cycle, the safeguarding system of the tools shall not rely solely on the use of fixed enclosing guards (see 5.1.1.2)

5.1.2.3 Prevention of access from the rear

The access to the tools, back gauges and ancillary devices area shall be prevented This shall be done using one or more of the following means:

a) Interlocking guards or interlocking guards in conjunction with fixed guards (see 5.1.1.2 and 5.1.1.3)

b) ESPE using AOPD with separate beams disposed in a vertical plane This shall be a system using at least two separate light beams (see EN 999:1998, 6.1.4 for the positioning of the beams) The required safety distance to the nearest trapping point shall be at least 1 000 mm when three beams are used; atleast 1 200 mm when two beams are used It shall be in accordance with EN 61496-1 and CLC/TC 61496-2 (and see Table 2 for the type) A reset at the rear of the press brake shall be provided.c) AOPDDR as described in 5.1.1.7 Press brakes intended to work solely in automatic cycle with automatic loading and unloading shall always be supplied with one or more of the safeguarding systems listed in 5.1.1.3 or 5.1.1.8 When it is necessary to prevent a person from entering and/or from standing in the rear area of a press brake (e.g to check if somebody is too close to the press brake dangerous zone when starting the automatic cycle), AOPDDR as described in 5.1.1.7 may be used as trip and/or presence sensing device Where access is required for production and setting mode for automatic cycle, the safeguarding system of the tools shall not rely solely on the use of fixed enclosing guards (see 5.1.1.2)

5.2 Control systems

5.2.1 General

This subclause shall apply to all safety-related components which directly or indirectly control or monitor the

functioning of moving parts of the press brake or its tools (see Table 2) EN 60204-1 shall be followed for the

design of electrical systems and EN 954-1 or EN ISO 13849-1 for the safety-related parts of electrical,

hydraulic, pneumatic and mechanical systems

NOTE 1 In addition to the requirements in 5.2.5, see EN ISO 12100-2:2003, 4.11.1 and 4.13

The redundant and monitored press brake control system shall operate in two separate functioning systems

Either system shall be independently capable of stopping the hazardous movement irrespective of the

condition of the other Failure of either system shall be detected through monitoring and another closing stroke

prevented Failure of either system shall be detected through monitoring and another closing stroke prevented

The control system of each cylinder capable of independent movement shall be provided with redundancy and

monitored functions (see Figure C.1)

NOTE 2 Mechanically linked cylinders, e.g by a torsion bar, are considered as a single cylinder

5.2.2 Manual control devices

Control devices shall be located and marked according to EN 894-1, EN 894-2, EN 894-3 and conform to

EN 60204-1:2006, Clause 10

Push button, foot pedal and other types of manual start control devices shall be shrouded to prevent

accidental operation or/and unintentional activation Foot pedals shall permit access from one direction only

and by one foot only Treadles shall not be used

NOTE See also 5.1.1.6 and 5.2.5.11

5.2.3 Failure of power supply

Interruption or a failure of the power supply shall not result in a loss of safety function until a complete stop is

reached Restoration of the energy supply shall not result in a press brake automatic restarting (see

EN ISO 12100-1:2003, 3.29) Systems shall be designed so that a line rupture in any circuit (e.g broken wire,

pipe or hose) will not result in the loss of a safety function (see EN 60204-1, EN 982 and EN 983)

5.2.4 Protection against external influences

Press brake electrical/electronic control system shall be protected against external influences (e.g vibration,

dust, water, electromagnetic fields) and be capable to pass the tests according to EN 50370-1 and

EN 50370-2 for the given performance criterion defined by the manufacturer

5.2.5 Safety functions

5.2.5.1 General

All the safety functions identified and described in this subclause shall meet the requirements of EN 954-1 or

EN ISO 13849-1 and EN 61496-1 or EN 574 stated in the Tables 2 and 3

NOTE When EN ISO 13849-1 is chosen, the performance levels of Tables 2 and 3 apply; when EN 954-1 is

chosen, only the categories apply

Safety related parts (e.g PLC) in accordance with EN ISO13849-1 or EN 62061 may be used as parts of the

control system, which shall fulfil the requirements of Tables 2 and 3

Figure 5 gives an example of safety related control system of a pressbrake designed in accordance with Table 2

Beam

cylinder(s)Hydraulic control system

Back gauges

Electronic Power DriveMonitoring

Monitoring

Control

Control

Electric/Electronic Safety Related Control System

Eg Relays, Safety modules, PES, …

Selection means

Rear interlocking guard

Side interlocking guards

Hold to run control device

Other sensors

Figure 5 — Example of safety related control system of a pressbrake designed in accordance with

Table 2.

5.2 Control systems

5.2.1 General

This subclause shall apply to all safety-related components which directly or indirectly control or monitor the

functioning of moving parts of the press brake or its tools (see Table 2) EN 60204-1 shall be followed for the

design of electrical systems and EN 954-1 or EN ISO 13849-1 for the safety-related parts of electrical,

hydraulic, pneumatic and mechanical systems

NOTE 1 In addition to the requirements in 5.2.5, see EN ISO 12100-2:2003, 4.11.1 and 4.13

The redundant and monitored press brake control system shall operate in two separate functioning systems

Either system shall be independently capable of stopping the hazardous movement irrespective of the

condition of the other Failure of either system shall be detected through monitoring and another closing stroke

prevented Failure of either system shall be detected through monitoring and another closing stroke prevented

The control system of each cylinder capable of independent movement shall be provided with redundancy and

monitored functions (see Figure C.1)

NOTE 2 Mechanically linked cylinders, e.g by a torsion bar, are considered as a single cylinder

5.2.2 Manual control devices

Control devices shall be located and marked according to EN 894-1, EN 894-2, EN 894-3 and conform to

EN 60204-1:2006, Clause 10

Push button, foot pedal and other types of manual start control devices shall be shrouded to prevent

accidental operation or/and unintentional activation Foot pedals shall permit access from one direction only

and by one foot only Treadles shall not be used

NOTE See also 5.1.1.6 and 5.2.5.11

5.2.3 Failure of power supply

Interruption or a failure of the power supply shall not result in a loss of safety function until a complete stop is

reached Restoration of the energy supply shall not result in a press brake automatic restarting (see

EN ISO 12100-1:2003, 3.29) Systems shall be designed so that a line rupture in any circuit (e.g broken wire,

pipe or hose) will not result in the loss of a safety function (see EN 60204-1, EN 982 and EN 983)

5.2.4 Protection against external influences

Press brake electrical/electronic control system shall be protected against external influences (e.g vibration,

dust, water, electromagnetic fields) and be capable to pass the tests according to EN 50370-1 and

EN 50370-2 for the given performance criterion defined by the manufacturer

5.2.5 Safety functions

5.2.5.1 General

All the safety functions identified and described in this subclause shall meet the requirements of EN 954-1 or

EN ISO 13849-1 and EN 61496-1 or EN 574 stated in the Tables 2 and 3

NOTE When EN ISO 13849-1 is chosen, the performance levels of Tables 2 and 3 apply; when EN 954-1 is

chosen, only the categories apply

Safety related parts (e.g PLC) in accordance with EN ISO13849-1 or EN 62061 may be used as parts of the

control system, which shall fulfil the requirements of Tables 2 and 3

Figure 5 gives an example of safety related control system of a pressbrake designed in accordance with Table 2

Beam

cylinder(s)Hydraulic control system

Back gauges

Electronic Power DriveMonitoring

Monitoring

Control

Control

Electric/Electronic Safety Related Control System

Eg Relays, Safety modules, PES, …

Selection means

Rear interlocking guard

Side interlocking guards

Hold to run control device

Other sensors

Figure 5 — Example of safety related control system of a pressbrake designed in accordance with

Table 2.