Bsi bs en 01870 13 2007 + a2 2012

1 Scope This document deals with !all significant hazards", hazardous situations and events as listed in Clause 4 which are relevant to horizontal beam panel sawing machines #where the s

National foreword

This British Standard is the UK implementation of

EN 1870-13:2007+A2:2012 It supersedes BS EN 1870-13:2007+A1:2009 which is withdrawn

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 to Technical Committee MTE/23, Woodworking machines

A list of organizations represented on this committee can be obtained

on request to its secretary

This 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.

This British Standard was

published under the authority

of the Standards Policy and

Strategy Committee on

31 January 2008

© The British Standards

Institution 2012 Published by

BSI Standards Limited 2012.

Amendments/corrigenda issued since publication Date Comments

30 June 2008 Supersession details updated in national foreword

31 December 2009 Implementation of CEN amendment A1:2009

NORME EUROPÉENNE

English Version Safety of woodworking machines - Circular sawing machines -

Part 13: Horizontal beam panel sawing machines

Sécurité des machines pour le travail du bois - Machines à

scie circulaire - Partie 13: Scies à panneaux horizontales à

presseur

Sicherheit von Holzbearbeitungsmaschinen - Kreissägemaschinen - Teil 13: Horizontale Plattenkreissägemaschinen mit Druckbalken

This European Standard was approved by CEN on 21 October 2007 and includes Amendment 1 approved by CEN on 13 August 2009 and Amendment 2 approved by CEN on 30 January 2012

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, 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 I S C H E S K O M I T E E FÜ R N O R M U N G

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2012 CEN All rights of exploitation in any form and by any means reserved

worldwide for CEN national Members

Ref No EN 1870-13:2007+A2:2012: E

Contents Page

Foreword 4

Introduction 6

1 Scope .7

2 Normative references .8

3 Terms and definitions 10

3.1 #General$$ 10

3.2 #Definitions$$ 10

4 List of significant hazards 17

5 Safety requirements and / or measures 20

5.1 General 20

5.2 Controls 20

5.2.1 Safety and reliability of control systems 20

5.2.2 Position of controls 21

5.2.3 Starting 21

5.2.4 Normal stopping 22

5.2.5 Emergency stop 23

5.2.6 Pressure beam control 24

5.2.7 ##Speed control$$ 24

5.2.8 Failure of the power supply 24

5.2.9 Failure of the control circuits 25

5.3 Protection against mechanical hazards 25

5.3.1 Stability 25

5.3.2 Hazard resulting from break-up during operation 25

5.3.3 Tool holder and tool design 26

5.3.4 Braking 26

5.3.5 Workpiece supports and guides 27

5.3.6 Prevention of access to moving parts 28

5.3.7 Guarding of drives 39

5.4 Protection against non-mechanical hazards 40

5.4.1 Fire 40

5.4.2 Noise 40

5.4.3 Emission of chips and dust 41

5.4.4 Electricity 42

5.4.5 Ergonomics and handling 42

5.4.6 Pneumatics 43

5.4.7 Electromagnetic compatibility 43

5.4.8 Static electricity 43

5.4.9 Errors of fitting 43

5.4.10 Laser 44

5.4.11 Supply disconnection (isolation) 44

5.4.12 Maintenance 44

6 Information for use 45

6.1 Warning devices 45

6.2 Marking 45

6.3 Instruction handbook 46

Annex A (normative) Impact test method for guards 52

A.1 General 52

A.2 Test method 52

A.2.1 Preliminary remarks 52

A.2.2 Testing equipment 52

A.2.3 Projectile for guards 52

A.2.4 Sampling 52

A.2.5 Test procedure 52

A.3 Results 53

A.4 Assessment 53

A.5 Test report 53

A.6 Test equipment for impact test 53

Annex B (normative) Saw spindle dimensional tolerances 55

Annex C (normative) Rigidity test for sectional safety curtain material 56

Annex D (normative) Braking tests 58

D.1 Conditions for all tests 58

D.2 Tests 58

D.2.1 Un-braked run-down time 58

D.2.2 Braked run-down time 58

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

Bibliography 65

Foreword

This document (EN 1870-13:2007+A2:2012) has been prepared by Technical Committee CEN/TC 142

“Woodworking machines - Safety”, the secretariat of which is held by UNI

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 September 2012, and conflicting national standards shall be withdrawn at the latest by September 2012

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 includes Amendment 1, approved by CEN on 2009-08-13, and Amendment 2, approved by CEN on 2012-01-30

This document supersedes #EN 1870-13:2007+A1:2009$

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

#EN ISO 12100:2010$ for a description of A, B and C standards)

EN 1870, Safety of woodworking machines — Circular sawing machines, consists of the following parts:

 Part 1: Circular saw benches (with and without sliding table), dimension saws and building site saws;

!deleted text"

 Part 3: Down cutting cross-cut saws and dual purpose down cutting cross-cut saws/circular saw benches;

 Part 4: Multi-blade rip sawing machines with manual loading and/or unloading;

 Part 5: Circular saw -benches/up-cutting cross-cut sawing machines;

 Part 6: Circular sawing machines for firewood and dual purpose circular sawing machines for

firewood/circular saw benches, with manual loading and/or unloading;

 Part 7: Single blade log sawing machines with integrated feed table and manual loading and/or unloading;

 Part 8: Single blade edging circular rip sawing machines with power driven saw unit and manual loading

and/or unloading;

 Part 9: Double blade circular sawing machines for cross-cutting with integrated feed and with manual

 Part 10: Single blade automatic and semi-automatic up-cutting cross-cut sawing machines;

 Part 11: Semi-automatic and automatic horizontal cross-cut sawing machines with one saw unit (radial

arm saws);

 Part 12: Pendulum cross-cut sawing machines;

 Part 13: Horizontal beam panel sawing machines;

 Part 14: Vertical panel sawing machines;

 Part 15: Multi-blade cross-cut sawing machines with integrated feed of the workpiece and manual loading

and/or unloading;

 Part 16: Double mitre sawing machines for V-cutting;

 Part 17: Manual horizontal cutting cross-cut sawing machines with one saw unit (manual radial arm

saws);

#

 Part 18: Dimension saws;

 Part 19: Circular saw benches (with and without sliding table) and building site saws.$

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, 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

Introduction

This document has been prepared to be a harmonised standard to provide one means of conforming to the essential safety requirements of the Machinery Directive, and associated EFTA regulations

This document is a type C standard as defined in #EN ISO 12100:2010$

The machinery concerned and the extent to which hazards, hazardous situations and events are covered are

indicated in the scope of this document

When provisions of this type C standard are different from those which are stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of other standards, for machines that have been designed and built according to the provisions of this type C standard

The requirements of this document are directed to manufacturers and their authorised representatives of horizontal beam panel sawing machines This document is also useful for designers and importers

This document also includes provision and examples of information to be provided by the manufacturer to the user

Common requirements for tooling are given in #EN 847-1:2005+A1:2007$

1 Scope

This document deals with !all significant hazards", hazardous situations and events as listed in Clause 4 which are relevant to horizontal beam panel sawing machines #where the saw unit of the front cutting line is mounted$ below the workpiece support and which are manually or mechanically loaded and / or unloaded, fitted with:

 a side pressure device and / or

 the facility for scoring and / or

 the facility for post-formed / soft-formed edge pre-cutting and / or

 a panel turning device and / or

 a pushing out device and / or

 pneumatic clamping of the saw blade and / or

 a powered panel loading device and / or

 a grooving device and / or

 additional cutting line(s) inside the machine for longitudinal and / or head cut (before transversal cutting line) and / or

 workpiece vacuum clamping as part of a panel turning device or of a panel loading device,

hereinafter referred to as "machines" when they are used as intended and under the conditions foreseen by the manufacturer #including reasonably foreseeable misuse$

The machines are designed for cutting panels consisting of:

a) wood based materials such as chipboard, fibreboard, plywood and also these materials where they are covered with plastic/light alloy laminates which can be cut easily;

b) solid wood;

c) hardened rubber and hardened plastic material;

d) non ferrous materials e.g light alloy;

e) gypsum boards, gypsum bounded fibreboards;

f) composite boards made from the materials listed above

This document does not deal with specific hazards related to:

1) specific features which differ from the list above;

2) the machining of panels with grooving tools;

3) mechanical unloading of panels;

4) the combination of a single machine being used with any other machine (as part of a line)

This document is not applicable to horizontal beam panel sawing machines which are manufactured before the date of its publication as EN

NOTE Machines covered by this standard if manually loaded and / or unloaded are listed under #1.4$ of Annex

IV of the Machinery Directive

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

!deleted text"

#EN 614-1:2006+A1:2009$, Safety of machinery — Ergonomic design principles — Part 1: Terminology

and general principles

#EN 847-1:2005+A1:2007$, Tools for woodworking — Safety requirements — Part 1: Milling tools,

circular saw blades

#EN 894-1:1997+A1:2008$, 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 894-2:1997+A1:2008$, Safety of machinery — Ergonomics requirements for the design of displays

and control actuators — Part 2: Displays

#EN 894-3:2000+A1:2008$, Safety of machinery — Ergonomics requirements for the design of displays

and control actuators — Part 3: Control actuators

#EN 1005-1:2001+A1:2008$, Safety of machinery — Human physical performance — Part 1: Terms and

definitions

#EN 1005-2:2003+A1:2008$, Safety of machinery — Human physical performance — Part 2: Manual

handling of machinery and component parts of machinery

#EN 1005-3:2002+A1:2008$, Safety of machinery — Human physical performance — Part 3:

Recommended force limits for machinery operation

#EN 1005-4:2005+A1:2008$, Safety of machinery — Human physical performance — Part 4: Evaluation

of working postures and movements in relation to machinery

#EN 1037:1995+A1:2008$, Safety of machinery — Prevention of unexpected start-up

#EN 1088:1995+A2:2008$, Safety of machinery — Interlocking devices associated with guards —

Principles for design and selection

#EN 1760-3:2004+A1:2009$, Safety of machinery — Pressure sensitive protective devices — Part 3:

General principles for the design and testing of pressure sensitive bumpers, plates, wires and similar devices

EN 50178:1997, Electronic equipment for use in power installations

EN 50370-1:2005, Electromagnetic compatibility (EMC) — Product family standard for machine-tools —

#EN 60439-1:19991)$, Low-voltage switchgear and controlgear assemblies — Part 1: Type-tested and

partially type-tested assemblies (IEC 60439-1:1999)

#EN 60529:19912)$, 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 61310-1:2008, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for

visual, acoustic and tactile signals (IEC 61310-1:2007)"

EN 61496-1:2004, Safety of machinery — Electro−sensitive protective equipment — Part 1: General requirements and tests (IEC 61496-1: 2004, modified)

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)

#EN 61800-5-2:2007, Adjustable speed electrical power drive systems — Part 5-2: Safety requirements —

Functional (IEC 61800-5-2:2007)$

#EN ISO 3743-1:2010, Acoustics — Determination of sound power levels and sound energy levels of noise

sources using sound pressure — Engineering methods for small movable sources in reverberant fields — Part 1: Comparison method for a hard-walled test room (ISO 3743-1:2010)$

#EN ISO 3743-2:2009$, Acoustics — Determination of sound power levels of noise sources using sound

pressure — Engineering methods for small, movable sources in reverberant fields — Part 2: Methods for special reverberant test rooms (ISO 3743-2:1994)

#EN ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise

sources using sound pressure — Engineering methods for an essentially free field over a reflecting plane (ISO 3744:2010)$

#EN ISO 3745:2009$, Acoustics — Determination of sound power levels of noise sources using sound

pressure — Precision methods for anechọc and semi-anechọc rooms (ISO 3745:2003)

#EN ISO 3746:2010, Acoustics — Determination of sound power levels and sound energy levels of noise

sources using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:2010)$

#EN ISO 4414:2010, Pneumatic fluid power — General rules and safety requirements for systems and their

components (ISO 4414:2010)$

#EN ISO 4871:2009$, Acoustics — Declaration and verification of noise emission values of machinery

and equipment (ISO 4871:1996)

#EN ISO 9614-1:2009$, Acoustics — Determination of sound power levels of noise sources using sound

intensity — Part 1: Measurement at discrete points (ISO 9614-1:1993)

#EN ISO 11202:2010, Acoustics  Noise emitted by machinery and equipment  Determination of emission sound pressure levels at a work station and at other specified positions applying approximate environmental corrections (ISO 11202:2010)$

#1) EN 60439-1:1999 is impacted by EN 60439-1:1999/A1:2004.$

#2) EN 60529:1991 is impacted by EN 60529:1991/A1:2000.$

#EN ISO 11204:2010, Acoustics  Noise emitted by machinery and equipment  Determination of emission sound pressure levels at a work station and at other specified positions applying accurate environmental corrections (ISO 11204:2010)$

#EN ISO 11688-1:2009,$ Acoustics — Recommended practice for the design of low-noise machinery and

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

#EN 12100:2010, Safety of machinery  General principles for design  Risk assessment and risk reduction (ISO 12100:2010)$

!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 13849-2:2008", Safety of machinery — Safety-related parts of control systems — Part 2:

Validation (ISO 13849-2:2003)

!EN ISO 13850:2008", 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

upper and lower limbs (ISO 13857:2008)"

ISO 7960:1995, Airborne noise emitted by machine tools — Operating conditions for woodworking machines

3 Terms and definitions

horizontal beam panel sawing machines

#machine fitted with one travelling saw unit per cutting line incorporating one or more circular saw blades which is designed for cutting panels

NOTE The workpiece is supported in the horizontal plane and mechanically positioned by a panel pusher for the cuts and held during cutting in position by a pressure beam The cutting stroke is power driven Before the cutting stroke commences, the saw blade is automatically raised/lowered and is retracted or out of operation for the return stroke The cut takes place only in a single straight line (examples, see Figures 1 a), 1 b) and 1 c)) The workpiece is loaded manually and / or by means of a powered panel loading device and manually or mechanically unloaded The machine may have any

of the following main features:

a) a side pressure device;

b) the facility for scoring;

c) the facility for cutting post-formed / soft-formed edge pre-cutting;

d) a panel turning device;

e) a pushing out device;

f) pneumatic clamping of the saw blade;

g) a powered panel loading device;

h) additional cutting line(s) (before front cutting line) located inside the machine e.g for longitudinal and / or head

cut (see Figure 2 and 3.2.18 and 3.2.19);

i) workpiece vacuum clamping as part of a panel turning device or a panel loading device.$

a) Example of a horizontal beam panel saw with panel loading from the rear side by a powered loading

device and with fixed distance guarding and light barrier

b) Example of a horizontal beam panel saw with panel loading from the front side and with fixed

distance guarding

c) Example of a horizontal beam panel saw with panel loading from the front and with individual

safeguarding of hazardous points Figure 1 — Examples of horizontal beam panel saws

Key

1 front cutting line

2 longitudinal cutting line

3 head cutting line

Figure 2 — Horizontal beam panel saw cutting lines

#3.2.2$$

integrated feed

feed mechanism for the workpiece and the saw unit(s) incorporating the saw blade(s) which are integrated with the machine and where the workpiece and the saw unit(s) are held and controlled mechanically during the machining operation

#3.2.3$$

manual loading

where the operator puts the workpiece on the workpiece support from the front side of the machine i.e there

is no intermediate loading device to transfer the workpiece from the operator to the machine front cutting line

main saw blade

circular saw blade which is used for separating the workpiece

scoring saw blade

saw blade mounted in front of the main saw blade which is used for scoring

#3.2.11$$

post-formed / soft-formed edge pre-cutting

cut made by a separate saw blade in the front profiled edge of the workpiece deep enough to prevent surface damage when the main saw blade makes its cut (see Figure 3)

Key

1 post-formed / soft-formed edge pre-cutting saw blade

2 feed direction of the saw unit

3 movement of post-formed / soft-formed edge pre-cutting saw blade

4 main saw blade

Figure 3 — Post-formed / soft-formed edge pre-cutting

#3.2.12$$

post-formed / soft-formed edge pre-cutting saw blade

saw blade used for post-formed edge pre-cutting This may be the scoring saw blade or a separate saw blade specifically for this purpose

saw blade rest position

position to which the saw blade(s) return(s) at the end of the cut outside the cutting area i.e into a position below the workpiece support or together with the saw unit into a position outside the cutting area also with protruding saw blade(s)

#3.2.14$$

saw unit rest position

position to which the saw unit returns at the end of each cutting cycle

#3.2.15$$

pressure beam rest position

position to which the pressure beam returns after the saw blade(s) has/have reached its/their rest position

#3.2.16$$

cutting cycle

movements of the saw unit incorporating the saw blade during the machining operation comprising:

 movement of the saw blade from its rest position to the cutting position;

 movement of the saw unit from its cutting position through the cutting stroke;

 return movement of the saw blade to its rest position;

 return movement of the saw unit to the chosen rest position

#3.2.17$$

front cutting line

cutting line closest to the operator's position (see Figure 2)

#3.2.18$$

longitudinal cutting line

additional cutting line(s) inside the machine (see Figure 2)

#3.2.19$$

head cutting line

first cutting line to divide a panel before further cuts #(see Figure 2), where the saw unit can be mounted below or above the workpiece support$

#3.2.20$$

pressure beam

workpiece clamping device which extends across the full working width of the machine Its function is to hold the workpiece down to the workpiece support during cutting It is also part of the safeguarding of the saw blade(s) in the cutting area

#3.2.21$$

panel pusher

movable workpiece guiding device which is used to position the workpiece over the line of cut The positioning

of the panel pusher may be under NC control The panel pusher is fitted with holding devices e.g collets for holding the workpiece in position

#3.2.22$$

side pressure device

power operated movable workpiece guiding device positioned inside the sectional safety curtain used to push the workpiece against the fence for right-angled cuts

#3.2.23$$

panel turning device

device integrated into the rear or front workpiece support which, after moving out of the workpiece support turns the panel e.g after the first cut for 90° to machine at right-angled cut

pushing out device

device which after moving or tilting from a rest position down to the workpiece support moves last part / small parts of a panel in front of the pressure beam for easy take off by the operator

#NOTE The same function can be achieved by telescopic collets or by collets with extended length mounted on the panel pusher.$

#3.2.25$$

powered panel loading device

#device where the panel stack is put e.g by a fork-lift truck or by a lifting unit either direct to a lifting platform

or to a powered roller table(s) which feed(s) the stack to the lifting table

NOTE The lifting platform moves the uppermost panel or the required number of panels into a position which enables the panel pusher to bring the panel(s) into the cutting position The lifting platform itself can be fitted with an own panel pusher The control circuits of the loading device are connected to the control circuits of the machine.$

information from the supplier

statements, sales literature, leaflets or other documents where the manufacturer (or supplier) declares either the characteristics or the compliance of the material or product to a relevant standard

#3.2.29$$

safety related part of a control system (SRP(CS))

part or subpart(s) of a control system that responds to input signals and generates safety-related output signals

The combined safety-related parts of a control system start at the point where the safety-related signals are initiated (including e.g the actuating cam and the roller of the position switch) and end at the output of the power control elements (including e.g the main contacts of the contactor) This also includes monitoring systems (3.1 of !EN ISO 13849-1:2008")

#3.2.30$$

#embedded software (SRESW)

software that is part of the system supplied by the control manufacturer and which is not accessible for modification by the user of the machinery

NOTE 1 Firmware or system software are examples of embedded software (3.1.37 of EN ISO 13849-1:2008).$ NOTE 2 Manufacturer means manufacturer of the system

NOTE 3 For example the operating system of a speed monitoring device

#3.2.31$$

#application software (SRASW)

software specific to the application, implemented by the machine manufacturer, and generally containing logic sequences, limits and expressions that control the appropriate inputs, outputs, calculations and decisions necessary to meet the SRP/CS requirements

[EN ISO 13849-1:2008, 3.1.36]$

4 List of significant hazards

This clause contains !all significant hazards", hazardous situations and events (see

#EN ISO 12100:2010$) #deleted text$, 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 document deals with these significant hazards by defining safety requirements and / or measures or by reference to relevant standards

#These hazards are listed in Table 1:$

#Table 1 — List of significant hazards

No Hazards, hazardous situations and hazardous events EN ISO 12100:2010 clause of this Relevant

document

1 Mechanical hazards related to:

- machine parts or workpieces due to:

5.2.2, 5.3.3, 5.3.5, 5.3.6, 6.2, 6.3, Annex B

5.2.6, 5.3.6, 6.2 c) mass and stability (potential energy of elements

d) mass and velocity (kinetic energy of elements in

Annex C

- accumulation of energy inside the machinery by:

5.2.6, 5.3.4, 5.3.5, 5.3.6, 5.3.7, 5.4.11, 5.4.12

5.3.4, 5.3.5, 5.3.6, 5.3.7, 5.4.11, 5.4.12

5.2.5, 5.2.6, 5.3.4, 5.3.6, 5.3.7, 5.4.11, 5.4.12

5.3.6, 5.3.7, 5.4.11, 5.4.12

5.2.5, 5.3.4, 5.3.6, 5.3.7, 5.4,

Table 1 — List of significant hazards (continued)

2 Electrical hazards due to:

2.1 Contact of persons with live parts (direct contact) 6.2.9, 6.3.5.4 5.4.4, 5.4.11

2.2 Contact of persons with parts which have become

live under faulty conditions (indirect contact)

4 Hazards generated by noise, resulting in:

4.1 Hearing loss (deafness), other physiological

disorders (loss of balance, loss of awareness)

7 Hazards generated by materials and substances (and their constituent elements) processed or

used by the machinery

7.1 Hazards from contact with or inhalation of harmful

fluids and dusts

8 Hazards generated by neglecting ergonomic principles in machinery design:

8.1 Unhealthy postures or excessive effort 6.2.7, 6.2.8.2, 6.2.11.12,

6.3.5.5, 6.3.5.6 5.2.2, 5.4.5

8.7 Design, location or identification of manual controls 6.2.8.7, 6.2.11.8 5.2.2

8.8 Design or location of visual display units 6.2.8.8, 6.4.2 5.2.2

5.2.6, 5.2.7, 5.2.9, 5.3.6, 5.4.11, 5.4.12

10 Unexpected start-up, unexpected overrun/overspeed (or any similar malfunction) from:

10.1 Failure / disorder of the control system 6.2.11, 6.3.5.4 5.2.1, 5.2.9,

5.4.11 10.2 Restoration of energy supply after an interruption 6.2.11.4 5.2.8, 5.4.6

10.3 External influences on electrical equipment 6.2.11.11 5.2.1, 5.4.7

10.6 Errors made by the operator (due to mismatch of

machinery with human characteristics and abilities,

see 8.6)

6.2.8, 6.2.11.8, 6.2.11.10,

(continued)

Table 1 — List of significant hazards (concluded)

11 Impossibility of stopping the machine in the

best possible conditions 6.2.11.1, 6.2.11.3, 6.3.5.2 5.2.4, 5.2.5, 5.4.11

12 Variations in the rotational speed of tools 6.2.2.2, 6.3.3 5.2.7

13 Failure of the power supply 6.2.11.1, 6.2.11.4 5.2.8

14 Failure of the control circuit 6.2.11, 6.3.5.4 5.2.9

15 Errors of fitting 6.2.7, 6.4.5 5.4.9

16 Break-up during operation 6.2.3 5.3.2

17 Falling or ejected objects or fluids 6.2.3, 6.2.10 5.2.6, 6.3

18 Loss of stability / overturning of machinery 6.3.2.6 5.3.1

PL given below in accordance with the requirements of EN ISO 13849-1:2008:$

a) for starting and restarting and for prevention of unexpected start-up after failure of power supply:

#PL = c$ (see 5.2.3, 5.2.8);

b) for normal stopping: #PL = c$ (see 5.2.4);

c) for emergency stop: #PL = c$ (see 5.2.5);

d) for interlocking of guards: #PL = c$ (see 5.3.6, 5.3.7);

e) interlocking with guard locking: #PL = c$ (see 5.3.6, 5.3.7);

f) for interlocking of functions: #PL = b or PL = c$ (see 5.2.3, 5.2.4, 5.2.6, 5.3.6.3, 5.3.6.6, 5.3.6.7)

g) for spindle speed indication of the selected speed (if spindle speed changing is provided):

#PL = b$ (see 5.2.7);

h) for interlocking the pressure beam movement with safety curtain guarding position: #PL = c$ (see

i) for trip devices: #PL = c$ (see 5.3.6.3, 5.3.6.4, 5.3.6.8);

j) for pressure beam control: #PL = b or PL = c$ (see 5.2.6);

k) for the control system for controlling reduced speed of panel pusher movement towards the operator:

#PL = c$ (see 5.3.5, 5.3.6.4);

l) for reset functions: #PL = c$ (see 5.3.6.4, 5.3.6.8);

m) for monitoring of the clamping position and / or pressure of the pressure beam: #PL = b$ (see 5.2.6); n) for braking: #PL = b or PL = c$ (see 5.3.4)

#Where magnetic / proximity switches are used they shall be in accordance with the requirements of 6.2 of

EN 1088:1995+A2:2008 and the related control system shall be at least PL = c in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams and inspection of the machine

5.2.2 Position of controls

The following electrical controls of the machine shall be positioned together on the main control panel, located

at the front side of the machine such that the working area is visible from this position by the operator:

 for starting and stopping the cutting cycle;

 for normal stopping;

 for the movement of the panel pusher

 for saw spindle speed changing (if fitted),

 for the side pressure (where fitted);

 the pushing out device (where fitted)

Emergency stop control devices shall be provided at the following positions:

a) on the main control panel and any auxiliary control panels;

b) at each side of any loading/unloading openings, unless a main control panel or auxiliary control panel is situated at this position

All hand-operated electrical controls shall be positioned between 600 mm and 1 800 mm above the floor level

Verification: By checking the relevant drawings, inspection of the machine, measurement and relevant

functional testing of the machine

5.2.3 Starting

5.2.3.1 General

Giving power to the actuator starting any movement of the machine shall only be possible if all interlocked guards and / or interlocked guards with guard locking are in place and functional This is achieved by the interlocking arrangements described in 5.3.6 and 5.3.7 Start or restart shall only be possible by actuation of the start control device provided for that purpose

For electrically operated machines the requirements of 9.2.5.2 of EN 60204-1:2006 apply but the exceptions described in 9.2.5.2 of EN 60204-1:2006 are not relevant, and "operation" means rotation of the tool spindle(s) and / or integrated feed movements;

#The safety related part of control circuits (also see 5.2.1) for starting and restarting except cutting cycle start shall be at least PL = c in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams, inspection of the machine and

relevant functional testing of the machine

5.2.3.2 Cutting sequence

The following requirements apply only for the front cutting line for machines manually loaded / unloaded The cutting cycle for each cut shall only be possible if the panel pusher(s) used for positioning the panel being cut is / are not capable of forward movement towards the pressure beam during the cutting stroke

The initiation of a cutting cycle shall only be possible if the following conditions in sequence are met:

a) the support of the sectional safety curtain shall have reached its guarding position (see 5.3.6.2);

b) the saw blade(s) shall have reached its / their cutting position and be running at the intended speed before the feed movement of the saw unit(s) starts (see 5.3.6.5);

c) before the saw blade(s) come(s) in contact with the #workpiece(s) the following sequence of conditions shall be met, e.g by means of a time delay device of fail safe technique conforming to PL = c in accordance with the requirements of EN ISO 13849-1:2008$:

1) The side pressure device (if fitted and in use in the cycle) shall move to its pressing position against the fence;

2) the pressure beam shall move to its clamping position (see also 5.2.6);

3) the workpiece guiding part of the side pressure device (if fitted to the saw unit and in use during the cycle) shall not be in contact with the workpiece

The initiation of the return stroke of the saw unit(s) if any, the release of the clamping pressure of the pressure beam and the opening of the safety curtain shall only be possible when the saw blade(s) have been retracted

in their rest position

Saw blade(s) shall remain in its/their rest position along the cutting line during return stroke

#The safety related part of control circuits (also see 5.2.1) for the interlocking arrangements for the cutting cycle shall be at least PL = c in accordance with the requirements of EN ISO 13849-1:2008

The safety related part of control circuits for panel pusher(s) movement(s) shall be at least PL = b in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams, inspection of the machine and

relevant functional testing of the machine

5.2.4 Normal stopping

The machine shall be fitted with a stop control which, when actuated shall disconnect power from all the machine actuators except to clamping device (if provided) and actuate the brake(s) (if provided – see 5.3.4)

#NOTE For normal stopping of PDS(SR) (power drive system, safety related) "safe torque off (STO)" according to

EN 61800-5-2:2007 and "safe stop 1 (SS1)" according to EN 61800-5-2:2007 are acceptable.$

The normal stop control shall be a #category 0 or 1$ stop in accordance with the requirements of 9.2.2 of

EN 60204-1:2006

#The stopping sequence$ shall be applied in the following order whereby the stopping of a), b) and e) may be initiated simultaneously:

a) stop any saw unit traversing movement and retract the saw blade(s) to its/their rest position;

b) cut power to the saw blade(s) spindle drive motor(s) #unless STO or SS1 is used$, actuate the brake(s) (if provided – see 5.3.4), release clamping pressure of the pressure beam(s);

c) return pressure beam(s) to its/their rest position;

d) cut power to the brake(s) (if electrical and if provided) after the saw blade(s) has come to rest e.g by a time delay of fail safe technique e.g of capacity type #of PL = c in accordance with the requirements of

EN ISO 13849-1:2008 unless STO or SS1 is used$;

e) cut power to the other machine actuators except to clamping device (if fitted)

The design of the control circuits shall be such as to satisfy the normal stopping sequence If a time delay device is used the time delay shall be at least the maximum braked run-down time Either the time delay shall

be fixed or the time delay adjustment device shall be sealed

#The safety related part of category of the control circuits (also see 5.2.1) for normal stopping shall be at least PL = c in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams, inspection of the machine and

relevant functional testing of the machine

5.2.5 Emergency stop

The requirements of !EN ISO 13850:2008" apply and in addition:

#NOTE For emergency stop of PDS(SR) (power drive system, safety related) "safe torque off" (STO) according to

EN 61800-5-2:2007 and “safe stop 1" (SS1) according to EN 61800-5-2:2007 are acceptable.$

The machine shall be fitted with emergency stop control devices positioned in accordance with the requirements

of 5.2.2 which, when actuated shall disconnect power from all the machine actuators except clamping devices (if fitted) and actuate the brake(s) (if provided)

The emergency stop control shall be a #category 0 or 1$ stop in accordance with the requirements in 4.1.4 of !EN ISO 13850:2008" and in accordance with the requirements in 10.7 of EN 60204-1:2006 The emergency stop control device shall be at any time of self latching type

The emergency stop control circuit shall conform to #category 0 or 1$ in accordance with the requirements of 9.2.5.4.2 of EN 60204-1:2006 The stopping sequence shall be applied in the following order whereby the stopping of a), b) and e) may be initiated simultaneously:

a) stop any saw unit(s) feed traversing movement and retract the saw blade(s) to its / their rest position; b) cut power to the saw blade spindle drive motor(s) #unless STO or SS1 is used$, actuate the brake(s) (if provided – see 5.3.4), release clamping pressure of the pressure beam(s);

c) return the pressure beam(s) to its / their rest position;

d) cut power to the brake(s) (if electrical and if provided) after the saw blade(s) has come to rest e.g by a time delay of fail safe technique e.g of capacity type conforming to #PL = c in accordance with the requirements of EN ISO 13849-1:2008 unless STO or SS1 is used$;

e) cut power to the other machine actuators except to clamping device (if fitted)

The design of the control circuits shall be such as to satisfy the emergency stopping sequence If a time delay device is used the time delay shall be at least the maximum braked run-down time Either the time delay shall

be fixed or the time delay adjustment device shall be sealed

#The safety related part of the control circuits (also see 5.2.1) for the emergency stops shall be at least

PL = c in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams, inspection of the machine and

relevant functional testing of the machine

5.2.6 Pressure beam control

Any pressure beam shall be in accordance with the following requirements:

a) pressure beam position and / or the clamping pressure shall be monitored;

b) the backward movement to its rest position shall not start before the saw blade(s) have reached its(their) rest position;

c) it shall remain in its rest position even when power is lost to its actuators On pneumatic systems, where non-return valves are used to achieve this requirement, these valves shall be fitted at the actuating cylinders (see also 5.2.8)

#The safety related part of the control circuits (also see 5.2.1) for the interlocking arrangements shall be at least PL = c in accordance with the requirements of EN ISO 13849-1:2008

As an exception the control circuits for the interlocking arrangements related to pressure beams for cutting lines other than front cutting line on machines manually loaded and/or unloaded may be at least PL = b in accordance with the requirements of EN ISO 13849-1:2008

The safety related part of the control circuit for monitoring the clamping position and / or pressure of pressure beam (see 5.2.1) shall be at least PL = b in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams, inspection of the machine,

measurement and relevant functional testing of the machine

5.2.7 ##Speed control$$

Where a machine is designed to operate at more than one main saw spindle speed the selected speed shall

be indicated at the operator's position at least during speed setting

#The safety related part of the control circuits (see also 5.2.1) for the indication of the selected speed shall

be at least PL = b in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking relevant drawings and / or circuit diagrams, inspection of the machine and relevant

functional testing of the machine

5.2.8 Failure of the power supply

The restoration of the energy supply after a supply interruption shall not result in a restart of any machine actuator in accordance with #EN 1037:1995+A1:2008$ For electrically driven machines this is achieved e.g by providing an under voltage protection at a predetermined under voltage level in accordance with the requirements in 7.5, paragraphs 1 and 3 of EN 60204-1:2006

If the clamping pressure of the pressure beam is applied by pneumatic pressure, provision shall be made to maintain position in the event of pneumatic power failure Where non-return valves are used to meet this requirement, they shall be fitted to the actuating cylinders in accordance with #EN ISO 4414:2010$

#The safety related part of the control circuits (also see 5.2.1) for prevention of unexpected start-up after failure of power supply shall be at least PL = c in accordance with the requirements of EN ISO 13849-1:2008 The safety related part of the control circuit (also see 5.2.1) for maintaining clamping pressure of the pressure beam shall be at least PL = b in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams, inspection of the machine and

relevant functional testing of the machine

5.2.9 Failure of the control circuits

The requirements of Clause 6 of #EN 1037:1995+A1:2008$ apply and in addition:

The control circuits shall be designed so that a line rupture in any circuit (e.g broken wire, pipe or hose) will in accordance with EN 60204-1:2006 and #EN ISO 4414:2010$ not result in the loss of a safety function e.g involuntary start of dangerous movements e.g saw blade rotation, saw unit movement, panel pusher movement or loss of pressure beam clamping

For requirements for the control circuits see 5.2.1

Verification: By checking the relevant drawings and / or circuit diagrams, inspection of the machine and

relevant functional testing on the machine

5.3 Protection against mechanical hazards

5.3.1 Stability

The machine shall be fitted with facilities for fixing it to a suitable stable structure e.g floor Facilities for fixing are e.g fixing holes or the necessary fixing devices in the machine frame (also see 6.3)

Verification: By checking the relevant drawings and inspection of the machine

5.3.2 Hazard resulting from break-up during operation

To avoid hazards of break-up during operation the guards for the saw blade(s) shall be manufactured from materials with at least the following properties:

a) steel with an ultimate breaking strength of at least 350 N mm-2 and a wall thickness of at least 1,5 mm; b) light alloy with characteristics in accordance with Table 2;

Table 2 — Characteristics of light alloy blades guards

Ultimate tensile strength

d) cast iron with an ultimate tensile strength of at least 200 N mm-2 and a wall thickness of at least 5 mm

#Verification: By checking the relevant drawings, tensile strength, performing the test in Annex A, for plastic

materials other than polycarbonate and inspection of the machine.$

NOTE For the ultimate tensile strength a confirmation from the manufacturer of the material can be useful

5.3.3 Tool holder and tool design

5.3.3.1 Geometrical performance

Saw spindles shall be manufactured in accordance with the tolerances given in #Annex B$

If the machine is fitted with saw blade(s) they shall be in accordance with the requirements of

#EN 847-1:2005+A1:2007$

Verification: By checking the relevant drawings and by measurement

5.3.3.2 Spindle locking

When it is necessary to hold the spindle stationary for tool changing, a spindle holding/blocking device shall

be provided e.g a double spanner arrangement or an integral locking bar inserted through the spindle When

a blocking device is used it shall prevent tool spindle rotation and shall not be deformed after starting the spindle drive motor, with the blocking device in place

Verification: By checking the relevant drawings, inspection of the machine and relevant functional testing of

the machine

5.3.3.3 Saw blade fixing device

For the fixing of the saw blade(s) saw flanges shall be provided The diameter of the flanges shall be at least

D/4 (where D = diameter of the largest saw blade for which the machine is designed) Where two flanges are

provided, both outside diameters of the saw flanges shall be within a tolerance of ± 1 mm The clamping surface shall be at least 3 mm in width and recessed to the centre

Precautions shall be taken to ensure that the tool does not come loose during start up, running, during rundown or during braking, e.g by using a positive connection between the spindle and the tool, or by using a positive connection between the front saw flange and the saw spindle

Verification: By checking the relevant drawings, measurement, inspection of the machine and relevant

functional testing of the machine

5.3.4 Braking

An automatic brake shall be provided for the saw spindle(s) where the un-braked run-down time exceeds 90 s The braked run-down time shall be less than 90 s

#NOTE 1 In the case of failure of power supply this run-down time may be exceeded.$

The braking torque shall not be applied directly to the tool itself or the saw blade flanges #A PLr of at least c for the braking function shall be achieved

Where a spring operated mechanical brake or any other type of brake not using electronic components is fitted the last paragraph of 9.3.4 of EN 60204-1:2006 does not apply and the minimum life time of the friction coating and method of replacement shall be given (see 6.3 n)).$

For electrical braking, reverse current injection braking shall not be used

periodically, e.g by monitoring braked run down time The feedback shall come from either the encoder fitted

to the spindle motor or from the measurement of the residual current in the wires powering the motor The test shall:

1) be independent from the basic control system for braking or an internal watch dog shall be

provided in the control system for breaking;

2) be independent from the intention of the operator;

3) be performed at each spindle stop.$

Where the test result is negative more than three times in succession, it shall not be possible to operate the machine A negative test result shall be indicated #The diagnostic coverage (DCavg) shall be ≥ 60%

NOTE 2 See Annex E of EN ISO 13849-1:2008 for DC estimation.$

#As an exception to 5.2.1, a simple electronic brake (using simple electronic parts like rectifiers, transistors, triacs, diodes, resistors, thyristors) may be PL = b and designed in category 1 in accordance with the requirements of EN ISO 13849-1:2008 if the “mean time to a dangerous failure” (MTTFd) according to Table 5

of EN ISO 13849-1:2008 reaches a value of “high” (at least 30 years)

NOTE 3 Complex electronic components like e.g microprocessors or PLCs cannot be considered as well tried under the scope of EN ISO 13849-1:2008 and therefore do not fulfil the requirements of category 1

NOTE 4 For calculating the probability of occurrence of a dangerous failure for a simple electronic brake component with no fault detection (no DC) and no testing capability (category 1) the procedure described in Annex D of

EN ISO 13849-1:2008 can be used.$

Verification: By checking the relevant drawings and / or circuit diagrams and inspection of the machine For

the determination of un-braked run-down time and braked run-down time, if relevant, see the appropriate tests described in #Annex D$

5.3.5 Workpiece supports and guides

A workpiece support shall be provided at the front of the machine which shall have a width of at least 200 mm, measured at right angle to the front cutting saw line

Any workpiece supporting structure which is capable of being contacted by the saw blade shall be made from

a material which is easily cut by the saw blade in the event of contact between the saw blade and the workpiece support, e.g light alloy, plastic

At the front side of the machine an extension table or tables shall be fitted to provide support for workpieces which can be cut by the machine

This is achieved by:

a) one fixed extension table fitted over the whole length of the cutting line; or

b) one fixed extension table fitted adjacent to the fence; and one or more fixed or moveable extension tables The length of each extension table (dimension perpendicular to the front cutting saw line) shall be at least 1,35 m and the width shall be at least 0,5 m #A width of 0,4 m for movable extension table is acceptable if the total width of the fixed and movable extension table is at least 1 m.$

Moveable extension tables shall be so constructed as to allow them to be moved along the cutting length of the machine

The speed of movement of the panel pushers and of the movement of the pushing out device shall not exceed

25 m min-1 in the direction of the operator This limitation doesn't apply when there is no interference between components parts of the panel pusher and maximum stack height

In addition the following measures against change or falsification of data shall be taken:

i) measures against loss of the data for the selected speed stored in the machine control if stored data result in an automatic selection of the intended panel pusher or pushing out device's speed:

 the safety related data for the panel pusher and / or pushing out device shall be stored either in 2 independent memory chips or stored two times in one single chip (one time inverse);

 after input of the safety related data for the panel pusher and / or pushing out device the data shall be confirmed;

 the two data shall be compared at each switching on of the isolator and at each fetch of the data If the two data are not identical it shall be impossible to start the panel pusher and / or pushing out device movements or if running the movement(s) shall be stopped and a warning shall be given;

 for monitoring of failures the processor comparing the data shall have an #deleted

text$ watch dog function;

ii) measures against falsification in data transfer between manual control, data stored in the machine control, display for the data and control of the inverter e.g.:

 the selected panel pusher and / or pushing out device speed shall be stored in the control system for the speed change #or in the unit that monitors the actual speed$;

 the selected panel pusher and / or pushing out device speed transmitted to the control of the inverter #or in the unit that monitors the actual speed$ shall be read back and monitored on the display for checking by the operator In case where the speed signals differ the start-up of the movement shall be prevented

NOTE For movement of the side pressure (if fitted) toward the fence see 5.3.6.5

#If the control system for monitoring the reduced speed of the panel pusher movement towards the operator and of the pushing out device movement (if fitted) includes electronic components this control system shall be

at least PL = c in accordance with the requirements of EN ISO 13849-1:2008.$

See also 6.3 d)

Verification: By checking the relevant drawings and/or circuits diagrams, inspection of the machine,

measurement and relevant functional testing of the machine

5.3.6 Prevention of access to moving parts

5.3.6.1 Safeguarding of the saw blade(s) outside the cutting area

Access to the saw blade(s) outside the cutting area i.e when the saw unit(s) is / are in the rest position or in the saw blade(s) changing position shall be prevented by fixed guards #If the fixed guards are to be demounted by the user, e.g for maintenance and cleaning purposes, their fixing systems shall remain attached to the guards or to the machinery when the guards are removed, e.g with unlosable screws; see 6.3 w).$ Any gaps in these guards shall be designed in accordance with safety distances in 4.5.1

b) on machines where the run-down time of the saw blade(s) exceeds 10 s a moveable interlocked guard with spring applied/power released guard locking device in accordance with Annex M of

#EN 1088:1995+A2:2008$

Any powered movement required for saw blade changing shall only be possible with the relevant moveable guards closed with the exception that this movement can start simultaneously with the opening of the moveable guard if:

i) no crushing and shearing hazards caused by the movement exist and

Verification: By checking the relevant drawings and / or circuit diagrams, measurement, inspection of the

machine and relevant functional testing of the machine

5.3.6.2 Safeguarding of the saw blade(s) in the cutting area

For front cutting line access to the saw blade(s) in the cutting area from the operator side of the machine shall

be prevented by a deterring impeding device in the form of a sectional safety curtain consisting of individual stripes On machines where access is possible to the cutting area from the rear side of the pressure beam, a second sectional safety curtain shall also be fitted at the rear side of the pressure beam

NOTE Access to the saw blade(s) from above the sectional safety curtain(s) is prevented by the pressure beam Any gaps in the guarding and the slot in the machine table through which the saw blade(s) projects during the cutting operation shall be designed in accordance with the safety distances in 4.5.1

of !EN ISO 13857:2008"

The sectional safety curtain shall meet the following requirements:

a) It shall be fitted next to the pressure beam;

b) it shall cover the full cutting width of the machine;

c) the maximum effective width of each stripe shall not exceed 50 mm;

d) it shall have reached its guarding position before the downward movement of the pressure beam starts; e) in its closed position the lower edge of the individual stripes shall be able to lie on the workpiece or on the workpiece support where no workpiece is present irrespective of the position of the pressure beam (see Figure 4);

Dimensions in millimetres

Figure 4 — Safety curtain

f) the stripes shall fulfil the rigidity test requirement described in #Annex C$

#The safety related part of the control circuits (also see 5.2.1) for interlocking the closure movement of the safety curtain with the pressure beam movement shall be at least PL = c in accordance with the requirements

of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams, measurement, inspection of the

machine and relevant functional testing of the machine

5.3.6.3 Safeguarding of the pressure beam

Access to the crushing and trapping zone between the downward moving pressure beam and the workpiece support and / or the workpiece shall be avoided by providing a mechanically actuated trip device (trip bar) on the operator side of the machine Possible positions of the trip bar sensor are shown in Figure 5 On machines where access from the rear side of the machine to the pressure beam is not prevented by the safeguarding of the rear side of the machine (see 5.3.6.4), a second mechanically actuated trip device (trip bar) shall also be fitted at the rear side of the pressure beam

The mechanically actuated trip device (trip bar) shall be in accordance with the following requirements:

a) it shall extend at least over the full length of the pressure beam;

b) when its sensor is activated the downward movement of the pressure beam shall reverse before the distance between the lower part of the pressure beam and the workpiece support (see Figure 5) is less than 12 mm

Verification: Depending on the chosen position of the trip bar sensor a distance block with the height of

 26 mm if the sensor position 1 a) (see Figure 5) is chosen; or

 30 mm if the sensor position 1 b) is chosen; or

 36 mm if the sensor position 1 c) is chosen

shall be positioned so that it activates the trip bar sensor in the middle of its length The downward movement

of the pressure beam with its maximum speed is initiated and the distance measured after the trip bar has reached its rest position with a measuring equipment with an accuracy of at least ± 0,5 mm The test shall be repeated with the distance block at the left and at the right end of the sensor In not any of the 3 tests the

measured distance shall be less then 12 mm

c) its dimensions shall be in accordance with Figure 5;

d) when operated, it shall cause first the saw unit to retract beneath the workpiece support and second the return of the pressure beam to the rest position;

e) the force to actuate the trip bar(s) shall not exceed 50 N wherever applied over the full length of it;

#The safety related part of the control circuits (also see 5.2.1) for trip bar action shall be at least PL = c in accordance with the requirements of EN ISO 13849-1:2008.$

When the pressure beam is in its rest position access to the crushing and trapping zone between its rear bottom edge and the top front edge of the panel pusher or of the collets during forward movement of the panel pusher or of the collets shall be prevented either:

 by interlocking of the forward movement with the sectional safety curtain so that this movement is only possible when the sectional safety curtain is in its guarding position; or

 limiting the forward movement so that the edge of the panel pusher or of the collets cannot approach within 50 mm of the rear bottom edge of the pressure beam (see Figures 6 a) and 6 b))

#The safety related part of the control circuits (also see 5.2.1) for the interlocking function shall be at least PL = c in accordance with the requirements of EN ISO 13849-1:2008.$

Verification: By checking the relevant drawings and / or circuit diagrams, measurement, inspection of the

machine and relevant functional testing of the machine