Bsi bs en 12478 2001 scan

www bzfxw com Safety of machine tools Large numerically controlled turning machines and turning centres The European Standard EN 12478 2000 has the status of a British Standard ILS n mo 10 NO mmr W~~H[.]

Safety of machine

numerically controlled turning machines and turning centres

The European Standard EN 12478:2000 has the status of a

'Ibis Bri!jsh Sramiard is the o f f i d English Language version of EN 12478:2000,

including conigendum May 2001

l h e UK pamclpanon m irs preparadon was en& by Techrucal ComnuItee MTl?J1 Madune rods, to Subcomnunee MTUbB, Safety of meml cumng rmclune

tools, whicb has the rqomibility to:

- aid enquirers to un&s?and the text;

- present to the rerponsiMe European cornmitree a r ~ en@- on the interpretation, or proposal for change, and keep the L K intemts informed;

- monitor related international and European developments and promulgate

themmtheUK

A List of organhtions represented on this shmmrnittee can be obtained on request

to its seerem

Cross-references The Bnnrh Sran& wtuch implement mternahonal or European pubhcaoons

ref& to m h s document may be found m the BSI %dads Catalogue under the seetion entitled "Inkmational Stan- Co-ndence Index", or by udng the

"Find" faciliw ofthe BSI Standards Electronic catalogue

A Xlish Standard dog not purport to include all t h e yprovisions of a

w n W Users of British Sran- are respnsible for thew correct application Compliance with a British Standard does not of itself confer immunity from legal obligations

l h documeru comprises a fmnt wvcr, an inside h n t cover, the EN ode page, pages 2 10 34, an inside back cover and a back cover

m e BSI copyright notice displayed m this document i n d i e when the donrment

was last issued

Sidelining in this document i n d i m the most recent changes by amendment

?hir Bri6sh S t u d d , having

been prepared under the

dirrction ofthe Eq%ering

Sector Cornmi% was published

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Stand& Corn* md mmes

into a- 3 on 15 January 2001

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ISBN 0 580 26278 7

Amendments issued since vubliattion

Copyright by the European Committee For Standardization

EUROPEAN STANDARD NORME EUROPEENNE

Safety of machine tools - Large numerically controlled turning

machines and turning centres

sewme der machineP-aunls -Tours a commande

numerique et cenmr de tournage de grandes dinemlons

Sichamen wn Werkzeugmaschlnen - G m h numenrch

gerteuerte Drshmffchlnen und Drehzentren

mis E w w s n Standam was approved by CEN on 6 ~ u l y 2000

CEN members are bound to -ply wM Vs CENICENELEC internal Reguiatlom which rt'bulate the condltlolrp for gMng this European

Sfandard me stam of a m n w l standard m at any alterawn Uptoaate ilsD ard bibliographlcai relerenms concemiw rvch natilcnd

standards may be mainad on application to the Management Cenm or to any CEN member

This European Standard exists in three oficial m s b n s (Engtsh French German) A version In any other language made by tranolatlon

under the renpomibliity d a CEN member into itr own language and notified to me Management Centre has the same s t a b us me&

Management tentre: rue de Stassart, 36 8-4050 8mrsels

o moo CEN All rights of exploitation h any form and by any means reserved Ref No EN 124782000 E

WMWW for CEN Mtbnal Membem

C o p y r i g h t by the European C o m m i t t e e For Standardization

Tue Mar 02 10:18:28 2004

3 Terms and definitions 6

4 List of significant hazards 9

6 Information for use 28 Annex A (normative) Noise emission measurement 32 AnnexZA (informative) Clauses of this European Standard addressing essentia!requirements or

other provisions of EU directives 33 Bibliogaphy 34

Copyright by the European Committee For Standardization

Tue Mar 02 10:18:30 2004

Foreword

This European Standard 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 May 2001, and conflicting national standards shall be withdrawn at the latest by May 2001

This European Standard 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 Diredve(s)

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

Organisation contribution to the preparation of this European Standard include the European rnanufachlrer Association CECIMO

The European Standards produce0 by CiNlTC 143 are panlcular Lo machine-tools an0 complemenl the relevant A and B standards on rhe subiect of general safety (see inlroducdon of EN 292-1:1991 lor a descriprion of A 3 ana C standards)

Annex A is normative According to the CENICENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France Germany Greece Iceland, Ireland Italy, Luxembourg, Nemedands, Norway, Portugal Spain Sweden, Switzerland and fie United Kingdom

Tue Mar 02 10:18:31 2004

0 Introduction

This standard 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 European Standard is a type C standard as defined in EN 292:1991

The extent to which hazards are covered 1s inoicated in the scope of mis standam In addi'jon Nrning machines

shall comply as appropnate with EN 292'1991 pan 1 and 2 for hazaros which are no1 wvered by this standard

The requirement of this European Standard concern designers, manufachlrers, suppliers and importers of

machines described in the swpe

This standard also includes information to be provided by the manufacturer to the user

Th,s European Stanaard specifes the requirements andlor measures to remove the hazards and lim11 the nsks on

general purpose n~merically controlled large turning machines and turning centres whlch are designed primarily to

work wfd metal as defined in 3.1 and 3.2 and herein after referred to as "machines"

Thb standard covers all signEcant relevant hazards which are listed in clause 4

This standard is applies to :

- numerically controlled large vertical tuming machines and turning centres which are equipped with work

clamping plate exceeding 500 mm outside diameter

- numerically controlled horkzontal spindle tuming machines and turning centres with distance between centres

exceeding 2 000 mm or which are equipped with work clamping devices exceeding 500 mm outside diameter

The standard also applies to ancillary devices (e.g for workpieces, tools and work clamping devices handling

devices and chip handling equipment, etc.) which are integral to the machine

This standard also applies also to machines which are integrated in an automatic production line or tuming cell

where the hazard and risks arising are comparable to those of machines working separately

Where additional processes are involved this standard can be taken as a basis (see also annex bibliography)

This standard does apply to NC turning machines with machining facilities under manual control which are dealt

with in EN 12840:2000

This standard applies to machines which are manufactured after the date of issue of this standard

This European Standard incorporates by dated or undated reference, provisions from other publications These

normative references are cited at the appropriate places in the text and the publications are listed hereafter For

dated references, subsequent amendments to or revisions of any of these publications apply to this European

Standard only when incorporated in it by amendment or revision For undated references the latest edition of the

publication referred to applies (including amendments)

EN 292-1:1991 Safety of machinery - Basic concepts, general principles for design - Pati 1 : Basic terminology

methodology

Copyright by the European Committee For Standardization

Tue Mar 02 10:18:32 2004

EN 294:1992 Safety of machinery- Safety distances to prevent dangerzone being reached by the upperlimbs

EN 349:1993, Safety of machinery - Dimensions gaps to avoid crushing ofparts of the human body,

EN 41 8:1992, Safety of machinery - Emergency stop equipment - Functional aspects - Principles

EN 547-1:1996 Safety of machinery - Human body measurements - Part-I : Principles for determining the dimensbns for openings for whole body access into machinery

EN 547-2:1996, Safety of machinery - Human body measmments - Part 2 : Principles for determining the dimensions required for access openings

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

EN 614-1:1995 Safety of machinery- Ergonomic design principles - Part I : Terminology and general principles

EN 894-1:1997, Safety of machinery - Eqonomics requirements for the desgn of displays and control actuators -

EN 894-2:1997 Safety of machinery- Ergonomics requirements for the design of displays and control actuators -

EN 894-3:2000, Safety of machinery - Ergonomics requirements for the desgn of displays and control actuators -

EN 9531 997, Safety of machinery- Guards -General requirements for the design of tixed and moveable guards

EN 954-1:1996, 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 components - Hydraulics

EN 9831996, Safety of machinery - Safety requirements for thid power systems and components - Pneumatics

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

EN 1050:1996, Safety of machinery - Principles of risk assessment

EN 1070:1998, Safety of machinery - Terminology

EN 1088:1995, Safety of machinery - Interimking devices associated with guards - Principles for design and selection

EN 1550:l 997, Safety of machinery- Safety requirements for the design and construction of work holding chucks

EN 1837:1999 Safety of machinery- Integral lighting of machines

I

EN IS0 14122-1:1996, Safety of machinery - Permanent means of access to machines and industrial plants -

EN ISO 14122-3:1996 Safety of machinery - Permanent means of access to machines and industrial plants -

prEN IS0 14122-4:1999, Safety of machinery - Permanent means of access to machines and industrial plants -

EN 12626:1997 Safely of machinery- Laser processing machines - Safety requirements

EN 12840:2000, Safely of machine tools - Manually operated turning machines

ENV 26385:1990 Ergonomic principles of the design of work systems

EN 60204-1 : I 992, Electrical equiprnent of indusbial machines - Part 1 : general requirement

EN 60529:1991 Degrees ofprotection provided by enclosures (IP code)

EN 60825-1:1994 + A11:1996 Safety of laser products - Equipment - Part 1 : Classification, requirements and

usets guide (IEC 60825-1:1993)

EN IS0 3744:1995, Acoustics - Determination of sound power level of noise sources using sound pressure -

Engineering method in an essential free field over a ref7ecting plane

EN IS0 3746:1995 Acoustics - Detemination of sound power level of noise sources using sound pressure -

Survey method using an enveloping measurement surface aver a reflecting plane

EN IS0 9614-1:1995 Acoustics - Determination of sound power levels of noise sources using sound intensity -

Part 1 : Measurement at discreet point

sound pressure levels at the workstation and at other specifid positions - Suwey method in situ

EN IS0 112Lkk1995, Acoustics - Noise emitted by machinery and equipment - Method requiring environmental

corrections

EN IS0 11688-1:1998, Acoustics - Recommended practice for the design of low noise machinery and equipment -

Part 1 : Planning

3 Terms and definitions

For the purposes of this standard and in addition to the terms and definitions given in EN 292:1991 and

EN 418:1992 and EN 1070:1998, the following terms and definitions apply: -

3.1

numericallv controlled tumina machine -~ - ~~

Machine tool in which the pnnzpal movement 6 the rotation of the workpiece against me statlonary cuning lool(s)

and where cumna enerqy is brought by the workpiece and not by me tool This machine is mtrollea by a numerical

control (NC) prGdirg %tornatic%nction according to 3.3.1

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Figure l b - Large vertical turning machine with operating platform

Figure 1 -Example of large turning machines

Copyright by the European Committee For Standardization

Tue Mar 02 10:18:35 2004

turning centre

A NC turning mach~ne equipped with power driven tool(s) and the capacity to orientate the work holding spindle

around its axis This machine may have additional features such as automatic tool changing from a magazine

3.3

machine modes of operation

NOTE Definitions of modes of NC are given below :

b) manual data input mode

They entry of programme data by hand at the NC

The mode of NC in which, at the initiation of the operator only one block of control data only is executed

machine setting mode

Mode in which the operator performs adjustments for the subsequent machining process

The programming, testing and manual (under power) non sequential operation of the machine

NOTE This mode comprises e g program sequence check, measurement d tool and/or wurkpiece position (e g by

twching the workpiece with a measurement probe or with the tool)

System designed to allow limiting acceleration/deceleraticm

Copyright by the European Committee For Standardization

Tue Mar 02 10:18:36 2004

3.8

vision panel

A window provided in a guard through which the operator can view the workzone w other areas of me machine

4 List of significant hazards

The signkicant hazaras associated with the machine@) have been ioentified (see table 1) in accordance with the procedures describe0 in 5 of EN 292.1:1991 and EN 1050:1996

The safety requirements andlor measures to eliminate these hazards or reduce their associated risks are laid down

in clause 5 of this standard

NOTE Fw machines which present additional hazards or do not m n f m to this standard, guidance on risk assessment can be found in EN 1050:1996 and on measures to be taken for hazards elimiMtion may be found in EN 292-1:1991 and

EN 292-2:1991

The aeslgner atlenbon is fccusec on hazards un.ch can o m r dunng me llfe of the machlne to both ovrator and olher persons wno have access to the Camr zone(sl for mndll or6 of tnlendea ~ s e lncl~a ng reasonably !oreseeable mlsdse of b e machlne (see 3.12 in EN 292-1:1991f The h-rds for both machining operation or operations requiring intervention by the operator w

omer personnel (e.g sening, deaning, maintenance and repair) An analysis of the failure of machine m p o n e n k including failure in the conbol system(s) is part of the risk assessment guidance on this subject is given EN 954-1:1996

The significant hazards covered by this standard are listed in table 1 Particular attention is given to the hazards dealing with :

- ejection of tools, clamping devices or workpieces or parts of them including chips (see 17 in table 1) ;

- entanglement on or drawing into moving parts of the machine, particularly Clamps work holding devices, tools and the workpiece (see 1.4 and 1.5 in table 1) ;

- cutling and crushing between moving and fued parts of the machine (see 1 .I and 1.3 in table 1) ;

- slip tlip and fall (see 19 in table 1)

Main danger zones are :

- w d i n g areas with moving spindles(s), w w k clamping components e.g work clamping devices, slide(s) tuNet(S), tool(s), workpiece(s), chip handling equipment (if integrated), etc ;

- workpiece loadinglunioading devices including bar feeders for horizontal spindle machines :

- external tool magazines and tool changers ;

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Table I - List of hazards

Harams Hazardous sltuatlon Relevanttype B standard Relevant clause

c) mass and stability (potential energy of

elements which may move under the

effect of gravity) ;

d) mass and velocity (kinetic energy of

elements in conbolled or uncontralled

motion) ;

e) inadequacy of mechanical strength

- accumulation of energy inside the

1 f) elastic elements (springs) :

g) liquids and gases under pressure ;

h) the effect of vacuum

1.2 Shearlng hazard

Table 1 -List of hazards (continued)

Hazardous situatlan Relevant type B standard Relevant clause

By moving part lncludlng bar feed EN 294 EN lorn 51.1 5.1.3, 5.17,

High pressure fluld yectlon or eleellon hazard

E l e C t r l ~ ~ l hazalds due to :

Contact of peersonswith llve parts (dlredcanmct)

1 2.2

3.1

1.3.2

1.5.1 16.3

Contact of persons with peris which have become llve

under fauny ccndllons (Indirect contact)

Burns, scalds and other lflurles by a psslble contact of

persons with oblects or matertals with an exbeme hlgh or

Iw,tsmpsrature, by flames or explosions and also by lhe

N

4 Hazards generated by nolse, resulting In :

I." I Headng loss (deafness), other physlologlcal disorders

(e.g 1065 of balance, 1058 of awareness)

Hazards generated by mdlatlon

Low ffequency, radlo frequency radlstlon, mluo waves

16.5 1 Lasers

Hazards generated by materlsls and subotsnees (and

t k l r constlluent elamento) processed or used by me

machinery

Hazards from cantacl wlth or lnhalatlon of harmful nulds

gases mlsts fumes, and dusts

Hazards generated by neglecting ergonornlc

prlnclples In maehlnery deslgn as e.g hazards fmm :

Unhealthy paslures w excessive elion

Inadequate consldsratlan of hand-arm or foot-leg

anatomy

NBgleCfed use of personal prolecuon equipment

Table 1 -List of hazards (continued)

Annex A of EN 292 Hazardous sltuatlan Relevant type B standard Relevant clause

1.5.8 4.5 3.2.4 From cuttlng process and from bar EN IS0 370% EN ISO 11202, 5.3.7.6.2.5.6.2.7

EN IS0 11688-1

malnlenance

senlng and maintenance

1.1.3.1.5.13 4.8 3.3b 3.4 At cutting fiuldr clrcui~ durlng setting 5.3.1

durlng bar machlnlng

(to be continued)

Table 1 -List of hazards (continued)

Hazards I Annex A o f I EN292 I ~azordous altuatlon I Relevant type B standard Relevant CIaUSe I

(8.6 (Human error human behavlqur

Inadequate d-lgn l ~ ~ a t l o n or Identlflcatlon of

manual Controls

Inadequate dealgn or locallon ofvlsual display units

At cuhlng process, dwlng sehlng

handllnglposlUonh~ofwomplew

At CN dlsplay, mode ofoperatlon

work clamping

Unexpected startup, unexpected ovsrrunloverapsed

(or any slrnllar mallunctlon) from :

Fsll~reldls~rderof the control system Undetected failure of confral system EN 954-1

causing malfunctlan, unexpected mwemends during tooVwork

Restorallon of energy supply ansr an lnlenuplbn

External Influences m electrical equipment

Vaflatlon In the ratatlonal apesd of tools

Fallure of power supply

(to be continued)

FaIIure of the control clrcult

1.2.6 1.2.1 1.5.11, 4.1.2.8 1.3.6 1.2.6

1.2.1 1.2.3, 1.24, 1.2.5

1.2.7 1.6.3

3.7.11

3.2 3.3 3.7 3.7.2

EN 80204-1, EN 1037 5.1.10 3.7.2

3.7.6.2.2

Dudng machlnlng, senhg

At NC control equipment dudng machining senlng and malntenanca

During setung, machlnlng

Control malhlndlan wlthconsequent mkepplbaUon, worR clarnplng fallure

Undetected fallurn of controlsystem wuolng maiiunctlon, unexpected

movemenls durlng tooVwork damplng change

EN 80204-1

5.1.9

5.1.8 5.1.10

EN 954-1 5.1.9

Table 1 -List of hazards (concluded)

Relevant type B stsndard Relevant clause

Falling or elected objscb or flulds

Slip, trlp and fall ot persons (related to mashlnery)

Fall of persons durn0 access tolor aVlrom the wolk

21.4 MechanlcBl hazard8 at me worm poslUon :

1.3.3

1.5.15 3.2.1.3.2.3,

Al won clamping, durlng rnachlnlng

at bar feed and molanl (workplece

part of tool chlp)

Where ~oMam a s c a p

Durlng senlng - machlnlng prEN 12431-1 lo -4

5.2.1.2.5.2.1.3 5.2.1.3.3.8.2.5 5.2.1.3.4

5.2.1.2 5.34, 6.2

5.2.1.3.3

I

1

5 Safety requirements andlor measures

Large tummg machines shall comply with the safety requtrements andlor measures c! this craLse In adoition the machine shall be oesioned according to the principles In 5 an0 6 of EN 292:1991 for hazards relevant but not significant which are noi dealt with b y m i i standard

For guidance in connection with risk reduction by design, see 3 of EN 292-21991, and for safeguarding measures see 4 of EN 292-2:1991

5.1 Control systems general

In addition to the requirements in 5.1.1 to 5.1.10, below see 3, 3.7 and 3.10 of EN 292-2:1991

5.1.1 Safety and reliability of control systems For the purpose of this standard the safety related pam of conlrol system means the enrire system from the initial act~ator (conuol oev~ce) or posluon detector to the point of lnpLt to the final acwaar or element e.g motor These safetv related Darts of control svsterns deal with the followina functions and shall fulfil the reauirements of the

- starting and restarting (category 1, see 5.1.3) ;

- operational stopping (category 1 see 5.1.4) ;

- selected maximum spindle speed (category 2 or3 see 5.1.8) ;

- emergency stopping (category 1 or 3 see 5.1.5) ;

- interlocking (category 1 or 3, see 5.2.1.2, 5.2.1.3.5.2.1.5, 5.2.1.6, 5.2.2, 5.2.4);

- interlocking with guard locking (category 3, see 5.2.1.2) ;

- axis movement (including reduced speed feeding) (category 2, see 5.1.8) ;

- acceleration/deceleratim control (category 2, see 5.2.1.1.1) ;

- mode selection (category 1, see 5.1.7) ;

- hold-to-run (category 3 see 5.1.7.2) ;

- work clamping (category 1 see 5.2.1.1) ;

- tool changing (category 1 see 5.2.4) Any combination of safety related parts of the system to different categories according to EN 954-1:1996 which achieve at least the same level of fault resistance is acceptable according to 6.3 in EN 954-1 :1996

Verification : By checking the relevant drawings and/or circuit diagrams and inspeaion and functional test on the machine For components by requiring confirmation of the conformity with the relevant standard from Ule

manufacturer

5.13 Position of controls Contml devices shall be located in acmrdance with EN 894:-1:1997, EN 894-2:1997 and EN 894-3:2000 and conform to EN 60204-?:I992 (see clause 5.1.5)

The control devlces including start, stop, emergency stop, mode selection switch, and holo-to-run controls shall be

provtded at the main operatlng console which shall be outside the danger zone e.g outside the perimeter fence or

on an operating platform

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No mode selection switch or start control that initiates machining mode shall be provided at any other point on the machine

Controls for operating the machine in settlng mode may be provided remote from the main operating console for example on pendant Alternatively they may be provided at separate consoles outside the danger zone

When multiple controls are provided for machine movements in setting mode only one shall be operational at any one time

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

5.1.3 Starting

For the purpose of this standard the condition in 9.2.5.2 of EN 60204-1:1992 "Safeguard in place and functional' is achieved by the interlocking arrangelhent required in 5.2.1.3

Startand restart function shall conform to categwy 1 of EN 954-1:1996

Starting various machine function depends upon the machine mode of operation selected (see 5.1.7)

The closure of the movable guards shall not result in the restart of moving machine parts except if the closure of the guard is powered, the guard being fitted with sensitive edges

The workholding Bpindle shall be provided with the means to control the rate of accelerationldecelwation (see

5.2.1.1.1)

Unexpected start up of hazardous movements, e.g of work holding spindle or plate, tailstock quill, tools axes, turret and workpiece damping devices shall be prevented according to clause 6 of EN 1037:1995 when the movable guards are open

The machine may only be started or restarted in machining mode when the guards are and the start device provided for that purpose is actuated (see 9.2.5.2 of EN 60204-1:1992)

Velificatim : By checking the relevant drawings andlor circuit diagrams, inspection and functional testing on the machine

An operational stop function which is initiated by a stop device shall be provided for each machine mode of operation When the operational stop function is initiated, the energy supply to axes drive motors, work holding device actuator (e.g powered chuck) and NC equipment need not be removed (stop category 2 in accordance with 9.2 of EN 60204-1:1992) However for power to remain connected to the drive for the work holding spindle it shall

be monitored to detect movement (see 6.4 of EN 1037:1995)

The monitoring arrangements shall meet category 3 of EN 954-1:1996

Operational stop function shall conform to category 1 of EN 954-1:1996

When the machine is stopped by the operatbnal stop opening the guard shall keep the machine stopped in category2 (see 9.2 of EN 60204-1:1992)

For machines where whole body access to the WorlnOne is possible, restarting the machine from operation stop shall require a douMe voluntary action by the operator e.g close access door and cycle start interlock reset and cyde start At least one of the control devices must be located at the main control position to ensure that the operator has withdrawn from the workzone before restarting (see 5.4 of EN 954-1:1996)

The machine wukzone shall be within visual feld of the operator from normal operating pmition,

A fault in the safety related part of control system for the operational stop shall resun in a stop category 1 according

to 9.2 of EN 60204-1:1992 (see also 5.2.2)

The working holding spindle drive shall be equipped with means to control deceleration (see 5.21.1.1)

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Verification : By checking the relevant drawings andlor circuit diagrams, inspection and functional testing on the machine

Emergency stop function shall be initiated by an emergency stop device($ which shall conform to 10.7 of

EN 60204-1:1992 An emergency stop control device shall be provided at operator's position including :

- any portable control panel (if provided) ;

- close to and inside the t w l magazine (where whole body access is possible), when the tool magazine is separate from the machining area

Verification : By checking the relevant drawings andlor circuit diagrams inspection and functional testing on the machine

5.1.6 Access t o the NC program Where access is Provided to ~rwrammable functions for alterations in machining mode, e.a for tool offset

This may be achieved by the use of a pass wora or a key switch (see also 6.2.9)

Verification : By checking the relevant drawings andlor circuit diagrams, inspection and functional testing on the machine

A lockable mode selectwn switch shall be provided to select between "Machining Mode' and 'Sening Mode' in accordance with A.1.2.5 of EN 292-2:19911A1:1995 and with 9.2.3 of EN 60204-1:1992 (see figure 2)

Mode selection devices shall ensure that only one mode is active at any one time

The parts of the control system provided for mode selection shall be category 1 according to EN 954-1:1996

m addibbn the following safeguarding arrangements specified in 5.1.7.1 and 5.1.72 shall be provided for the corresponding mode of operation

Verifcation : By checking the relevant drawings andlor circuits diagrams, inspection and functional testing of the machine

When the machining mode of operation is selected and the movable guards are open no movement of machine elements Shall be possible except :

- the opening and closing movement of the workpiece clamping device(s) and movement of taiktock quill for the purpose of changing workpiece (see also 5.2.1.1.1) :

- t w l spindle rotation at 50 min" or less by hold-to-run

Other movements shall be possible only where the interlocked movable guards are closed (see 5.2.1.2)

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