SIST EN 693:2001+A1:2009
(Main)Machine tools - Safety - Hydraulic presses
Machine tools - Safety - Hydraulic presses
1.1 This standard specifies technical safety requirements and measures to be adopted by persons undertaking the design (as defined in 3.11 of EN 292-1:1991), manufacture and supply of hydraulic presses which are intended to work cold metal or material partly of cold metal.
1.2 This standard also covers presses, whose primary intended use is to work cold metal, which are to be used in the same way to work other sheet materials (such as cardboard, plastic, rubber or leather), and metal powder.
1.3 The requirements in this standard take account of intended use, as defined in 3.12 of EN 292-1:1991. This standard presumes access to the press from all directions, deals with the hazards described in clause 4, and specifies the safety measures for both the operator and other exposed persons.
1.4 This standard also applies to ancillary devices which are an integral part of the press. For the safeguarding of integrated manufacturing systems using presses, see also ISO 11161.
1.5 This standard does not cover machines whose principal designed purpose is:
a) sheet metal cutting by guillotine;
b) attaching a fastener, e.g. riveting, stapling or stitching;
c) bending or folding;
d) straightening;
e) turret punch pressing;
f) extruding;
g) drop forging or drop stamping;
h) compaction of metal powder;
i) single purpose punching machines designed exclusively for profiles, e.g. for the construction industry.
1.6 This standard is applicable to machines built after its date of issue.
Werkzeugmaschinen - Sicherheit - Hydraulische Pressen
1.1 Diese Norm legt technische Sicherheitsanforderungen und -maßnahmen fest, die von Konstrukteuren
(wie in EN 292-1:1991, 3.11 definiert), Herstellern und Lieferanten von hydraulischen Pressen für die
Kaltbearbeitung von Metall oder teilweise aus kaltem Metall bestehendem Werkstoff anzuwenden sind.
1.2 Diese Norm gilt auch für Pressen, deren ursprünglicher Verwendungszweck die Kaltbearbeitung von
Metall ist und die in gleicher Weise für die Bearbeitung von anderem Material (wie Pappe, Kunststoff, Gummi
oder Leder) und Metallpulver eingesetzt werden sollen.
1.3 Die in dieser Norm enthaltenen Anforderungen beziehen die bestimmungsgemäße Verwendung mit ein,
wie in EN 292-1:1991, 3.12 definiert. Diese Norm unterstellt Zugang zur Presse von allen Seiten, behandelt
die beschriebenen Gefährdungen in Abschnitt 4 und legt die Sicherheitsmaßnahmen für den Bediener und
andere exponierte Personen fest.
1.4 Diese Norm gilt auch für Zusatzeinrichtungen, die fester Bestandteil der Presse sind. Bezüglich
technischer Schutzmaßnahmen der integrierten Fertigungssysteme, die Pressen beinhalten, siehe auch
ISO 11161.
1.5 Diese Norm gilt nicht für Maschinen, deren Hauptzweck ist:
a) Schneiden von Blech mit einer Tafelschere;
b) Herstellen mechanischer Verbindungen, z. B. durch Nieten, Klammern oder Heften;
c) Biegen oder Abkanten;
d) Richten;
e) Revolver-Lochstanzen;
f) Strangpressen;
g) Warmverformung oder Kaltmassivumformung;
h) Verdichtung von Metallpulver;
i) Lochstanzen für die Bearbeitung von Profilen, z. B. im Stahlbau.
1.6 Diese Norm gilt für Maschinen, die nach dem Ausgabetag dieser Norm gebaut wurden.
Machines-outils - Sécurité - Presses hydrauliques
1.1 La présente norme spécifie les prescriptions techniques de sécurité et les dispositions que doivent respecter
les personnes chargées de la conception (comme défini en 3.11 de l'EN 292-1:1991), de la construction et de la
fourniture des presses hydrauliques conçues pour le travail à froid des métaux ou des matériaux partiellement
constitués de métal.
1.2 La présente norme s'applique également aux presses pour lesquelles l'utilisation normale première est le
travail à froid des métaux et qui sont utilisés de la même manière pour le travail d'autres matériaux en feuilles (tels
que le carton, le plastique, le caoutchouc ou le cuir), et de poudre métallique.
1.3 Les prescriptions de la présente norme tiennent compte de l'utilisation normale telle que définie en 3.12
de l'EN 292-1:1991. La présente norme suppose un accès possible à la presse de tous les côtés, traite des
phénomènes dangereux décrits à l'article 4 et spécifie les prescriptions de sécurité à la fois pour l'opérateur et les
autres personnes exposées.
1.4 La présente norme est applicable également aux dispositifs auxiliaires faisant partie intégrante de la presse.
Pour la protection des systèmes de fabrication intégrés utilisant des presses, voir également ISO 11161.
1.5 La présente norme n'est pas applicable aux machines dont l'objet principal désigné est :
a) la découpe du métal en feuilles, par cisaille guillotine ;
b) le montage d'élément, par exemple par rivetage, agrafage ou piquage ;
c) le pliage ou le cintrage ;
d) le dressage ;
e) le poinçonnage sur poinçonneuse revolver ;
f) l'extrusion ;
g) le matriçage par choc, le poinçonnage par choc ;
h) le compactage des poudres métalliques ;
i) les poinçonneuses simples conçues exclusivement pour les profilés, par exemple pour l'industrie de la
construction.
1.6 La présente norme s'applique aux machines fabriquées après la date de publication de la norme.
Obdelovalni stroji - Varnost - Hidravlične stiskalnice
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 693:2001+A1:2009
01-maj-2009
2EGHORYDOQLVWURML9DUQRVW+LGUDYOLþQHVWLVNDOQLFH
Machine tools - Safety - Hydraulic presses
Werkzeugmaschinen - Sicherheit - Hydraulische Pressen
Machines-outils - Sécurité - Presses hydrauliques
Ta slovenski standard je istoveten z: EN 693:2001+A1:2009
ICS:
25.120.10 Kovaški stroji. Stiskalnice. Forging equipment. Presses.
Škarje Shears
SIST EN 693:2001+A1:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 693:2001+A1:2009
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SIST EN 693:2001+A1:2009
EUROPEAN STANDARD
EN 693:2001+A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2009
ICS 25.120.10 Supersedes EN 693:2001
English Version
Machine tools - Safety - Hydraulic presses
Machines-outils - Sécurité - Presses hydrauliques Werkzeugmaschinen - Sicherheit - Hydraulische Pressen
This European Standard was approved by CEN on 20 November 2000 and includes Amendment 1 approved by CEN on 29 December
2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 693:2001+A1:2009: E
worldwide for CEN national Members.
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SIST EN 693:2001+A1:2009
EN 693:2001+A1:2009 (E)
Contents Page
Foreword .3
Introduction .4
1 Scope .4
2 Normative references .5
3 Terms and definitions .6
4 List of hazards . 12
5 Safety requirements and measures . 14
5.1 Introduction . 14
5.2 Basic design considerations . 14
5.3 Mechanical hazards in the tools area . 17
5.4 The control and monitoring system. 21
5.5 Toolsetting, trial strokes, maintenance and lubrication . 24
5.6 Mechanical hazards - Other . 25
5.7 Slips, trips and falls . 26
5.8 Protection against other hazards . 26
6 Verification of the safety requirements and/or measures . 33
7 Information for use . 39
7.1 Marking . 39
7.2 Instruction handbook . 40
Annex A (normative) Calculation of minimum safety distances . 42
Annex B (normative) The response time of the hydraulic system . 44
Annex C (informative) Closed tools . 45
Annex D (informative) Interlocking devices associated with guards . 46
Annex E (informative) Electro-sensitive protective equipment (ESPE) using active opto-electronic
protective devices (AOPDs) . 49
Annex F (informative) Conditions for noise measurement of hydraulic presses . 50
Annex G (informative) The connection of the stopping time measurement equipment . 52
Annex ZA (informative) !!Relationship between this European Standard and the Essential
!!
Requirements of EU Directive 98/37/EC amended by Directive 98/79/EC"""" . 53
Annex ZB (informative) !!!!Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC"""" . 54
Bibliography . 55
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EN 693:2001+A1:2009 (E)
Foreword
This document (EN 693:2001+A1:2009) 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 August 2009, and conflicting national standards shall be withdrawn at
the latest by December 2009.
This document includes Amendment 1, approved by CEN on 2008-12-29.
This document supersedes EN 693:2001.
The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ".
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 Directive(s).
!For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this
document."
Annexes A and B to this standard are normative, whereas Annexes C to G!, ZA and ZB" are informative.
This standard also contains a bibliography.
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, 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 and United Kingdom.
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EN 693:2001+A1:2009 (E)
Introduction
0.1 This standard is applicable to hydraulic presses as defined in 3.10.
0.2 This standard has been prepared to be a harmonized standard to provide one means of conforming with
the essential safety requirements of the "Machinery" Directive and associated EFTA Regulations.
0.3 The extent to which hazards are covered is indicated in the scope of this standard. In addition, machinery
shall comply as appropriate with EN 292 for hazards which are not covered by this standard.
0.4 Complementary guidance is given in the A and B standards to which reference is made in the text (see
clause 2). The figures are intended to be examples only and not to give the only interpretation of the text.
1 Scope
1.1 This standard specifies technical safety requirements and measures to be adopted by persons
undertaking the design (as defined in 3.11 of EN 292-1:1991), manufacture and supply of hydraulic presses
which are intended to work cold metal or material partly of cold metal.
1.2 This standard also covers presses, whose primary intended use is to work cold metal, which are to be
used in the same way to work other sheet materials (such as cardboard, plastic, rubber or leather), and metal
powder.
1.3 The requirements in this standard take account of intended use, as defined in 3.12 of EN 292-1:1991.
This standard presumes access to the press from all directions, deals with the hazards described in clause 4,
and specifies the safety measures for both the operator and other exposed persons.
1.4 This standard also applies to ancillary devices which are an integral part of the press. For the
safeguarding of integrated manufacturing systems using presses, see also ISO 11161.
1.5 This standard does not cover machines whose principal designed purpose is:
a) sheet metal cutting by guillotine;
b) attaching a fastener, e.g. riveting, stapling or stitching;
c) bending or folding;
d) straightening;
e) turret punch pressing;
f) extruding;
g) drop forging or drop stamping;
h) compaction of metal powder;
i) single purpose punching machines designed exclusively for profiles, e.g. for the construction industry.
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EN 693:2001+A1:2009 (E)
1.6 This standard is applicable to machines built after its date of issue.
2 Normative references
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 - Part 1: Basic
terminology, methodology.
EN 292-2:1991, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical
principles and specifications (and Amendment A1:1995).
EN 294:1992, Safety of machinery - Safety distances to prevent danger zones being reached by the upper
limbs.
EN 349:1993, Safety of machinery - Minimum gaps to avoid crushing of parts of the human body.
EN 418:1992, Safety of machinery - Emergency stop equipment, functional aspects - Principles for design.
EN 563:1994, Safety of machinery - Temperatures of touchable surfaces - Ergonomics data to establish
temperature limit values for hot surfaces.
EN 574:1996, Safety of machinery - Two-hand control device.
EN 614-1:1995, Safety of machinery - Ergonomic design principles - Part 1: Terminology and general
principles.
EN 626-1:1994, Safety of machinery - Reduction of risks to health from hazardous substances emitted by
machinery - Part 1: Principles and specifications for machinery manufacturers.
EN 842:1996, Safety of machinery - Visual danger signals - General requirements, design and testing.
EN 894-2:1997, Safety of machinery - Ergonomics requirements for the design of displays and control
actuators - Part 2: Displays.
EN 894-3:2000, Safety of machinery - Ergonomics requirements for the design of displays and control
actuators - Part 3: Control actuators.
EN 953:1997, Safety of machinery - General requirements for the design and construction of guards (fixed,
movable).
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 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 - Approach speed of parts of the body for the positioning of safety devices.
5
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EN 693:2001+A1:2009 (E)
prEN 1005-2:1993, Safety of machinery - Human physical performance - Part 2: Manual handling of objects
associated to machinery.
EN 1037:1995, Safety of machinery - Prevention of unexpected start-up.
EN 1050:1996, Safety of machinery - Principles for risk assessment.
EN 1088:1995, Safety of machinery - Interlocking devices associated with guards - Principles for design and
selection.
EN 1127-1:1997, Safety of machinery - Fire and explosions - Part 1: Explosion prevention and protection.
EN 1299:1997, Vibration isolation of machines - Information for the application or source isolation.
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)"
ISO 11161:1994, Industrial automation systems - Safety of integrated manufacturing systems – Basic
requirements.
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).
ISO/TR 11688-1:1995, Acoustics - Recommended practice for the design of low-noise machinery and
equipment - Part 1: Planning.
EN 60204-1:1997, Safety of machinery - Electrical equipment of machines - Part 1: General requirements
(IEC 204-1:1992, modified).
EN 61310-2:1995, Safety of machinery - Indication, marking and actuation - Part 2: Requirements for marking
(IEC 1310-2:1995).
EN 61496-1:1997, Safety of machinery - Electrosensitive protective equipment - Part 1: General requirements
and tests (IEC 61496-1:1997).
prEN 61496-2:1997, Safety of machinery - Electrosensitive protective equipment - Part 2: Particular
requirements for equipment using active opto-electronic protective devices (IEC 61496-2:1997).
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply. Further terms and definitions are
provided in relevant A and B standards and in annex A of EN 292-2:1991/A1:1995.
3.1
ancillary device
any device intended for use with the press tools and integrated with the press, e.g. devices for lubrication,
feed and ejection.
3.2
cycle – automatic
operating mode where the slide/ram repeats continuously or intermittently, all functions achieved without
manual intervention into the danger zone after initiation.
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3.3
cycle – operating
movement of the slide/ram from the cycle start position (normally the top dead centre) to the bottom dead
centre and back to the cycle stop position (normally the top dead centre). The operating cycle includes all
operations carried out during this movement.
3.4
cycle – single
operating mode where each operating cycle of the slide/ram has to be positively actuated by the operator.
3.5
dead centres
points 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 (BDC),
or furthest from the die (generally it corresponds to the end of the opening stroke), known as the top dead
centre (TDC).
3.6
die
fixed part of the tools used in a press.
3.7
die cushion
accessory for a die which accumulates and releases, or absorbs, force as required in some press operations.
3.8
early opening interlocking guard
guard associated with an interlocking device which, if opened when any dangerous movement in the tools
area has ceased, does not interrupt the operating cycle.
3.9
guard locking device
mechanical device to maintain an interlocking guard gate in the closed and locked position until the risk of
injury from the hazardous machine functions has passed.
3.10
hydraulic press
machine designed or intended to transmit energy by linear movement between closing tools by hydraulic
means for the purpose of the working (e.g. forming or shaping) of cold metal or material partly of cold metal
between the tools. Such energy is produced by the effects of hydrostatic pressure (see figures 1 and 2).
3.11
limited movement control device; inching device
control device, the actuation of which permits only a limited amount of travel of a machine element, thus
minimizing risk as much as possible; further movement is precluded until there is a subsequent and separate
actuation of the control. [3.23.8 of EN 292-1:1991].
3.12
monitoring (M)
safety function which ensures that a safety measure is initiated if the ability of a component or an element to
perform its function is diminished, or if the process conditions are changed in such a way that hazards are
generated.
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3.13
muting
temporary automatic suspension of a safety function(s) by safety related parts of the control system during
otherwise safe conditions in the operation of a machine [3.7 of EN 954-1:1996].
3.14
overall system stopping performance; overall response time
time occurring from actuating the protective device to the cessation of hazardous motion, or to the machine
assuming a safe condition.
3.15
part detector
device which detects the workpiece and/or the correct position of the workpiece and which permits or prevents
the initiation of the stroke.
3.16
position switch
switch which is operated by a moving part of the machine when this part reaches or leaves a predetermined
position.
3.17
redundancy (R)
application of more than one device or system, or part of a device or a system, with the objective of ensuring
that, in the event of one failing to perform its function, another is available to perform that function. [3.47 of EN
60204-1:1992].
3.18
restraint valve
device which protects against a gravity fall of the slide/ram.
3.19
single stroke function
feature used to limit the motion of the tool to one operating cycle (single cycle) even if the stroke initiating
means (e.g. a pedal) is held in the operating position.
3.20
slide/ram
main reciprocating press member which holds the tool.
3.21
tool
moving part of the tools.
3.22
tool protective device
device which protects the tool against damage by stopping the stroke or by preventing its start.
3.23
tools
term for the combination of tool and die.
3.24
tools – closed
tools designed and constructed to be inherently safe (see figure C.1).
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3.25
up-stroking press
vertical press in which the press table moves upwards during the closing stroke (reciprocal to a down-stroking
press, see figure D.1).
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Figure 1 — Example of box frame type hydraulic press (tools area safeguards not shown)
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EN 693:2001+A1:2009 (E)
Figure 2 — Example of open front hydraulic press (tools area safeguards not shown)
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4 List of hazards
4.1 The list of hazards contained in table 1 is the result of a risk assessment, carried out as required by EN
1050, for all hydraulic presses covered by the scope of this standard. The technical measures and information
for use contained in clauses 5 and 7 and the annexes are based on the risk assessment, and deal with the
identified hazards by either eliminating them or reducing the effects of the risks they generate.
4.2 The risk assessment assumes foreseeable access from all directions, as well as unexpected and
unintended strokes or gravity falls. Risks to both the operators and other persons who may have access to the
danger zones are identified, taking into account all hazards which may occur during the life of the press. The
assessment includes an analysis of the effect of failure in the control system.
4.3 In addition, the user of this standard, i.e. the designer, manufacturer or supplier, shall conduct a risk
assessment in accordance with EN 1050 with particular attention to:
the intended use of the press including maintenance, toolsetting and cleaning, and its reasonably
foreseeable misuse;
the identification of the significant hazards associated with the press (see 4.4).
4.4 Table 1 of this standard is a list of significant hazards and their related danger zones normally associated
with a hydraulic press. As part of the risk assessment, the designer shall verify whether the list of hazards in
table 1 is exhaustive and applicable to the press under consideration.
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Table 1 — Significant hazards, danger zones, preventive measures
Hazards Danger zone Preventive Relevant
measures: clauses
relevant clauses of
of this standard EN 292-1
Mechanical hazards
Crushing hazard Tools area: 5.2 to 5.5 4.2.1
Shearing hazard - between moving tools Annexes C, D
Cutting or severing hazard - moving slide and E
Entanglement hazard - moving die cushions
Drawing-in or trapping hazard - workpiece ejectors
- guards
Impact hazard Moving parts of electrical,
hydraulic and pneumatic
equipment
Motor and drive machinery 5.6.1 to 5.6.3
Mechanical handling device 5.6.1 to 5.6.4
Ejection hazard Machine components 5.6.5
Workpieces and tools 7.2.2 i)
High pressure fluid ejection hazard Hydraulic systems 5.8.3 4.2.1
Slip, trip and fall hazards All work at heights 5.7 4.2.3
Floor area around the press
Electrical hazards
Direct contact hazard Electrical equipment 5.8.1 4.3
Indirect contact hazard Electrical equipment 5.8.1 4.3
Parts made live by electrical
equipment under fault
conditions
Thermal radiation hazard (burns)
Thermal hazards resulting in burns and Parts of the hydraulic system 5.8.2 4.4
scalds, by a possible contact of persons
Hazards generated by noise resulting in Any area at the press where 5.8.4 4.5
hearing losses (deafness) there is a risk to hearing
Hazards generated by vibration Parts of the press where the 5.8.5 4.6
risk occurs, e.g. the
workstation(s)
Hazards generated by materials and Hydraulic systems; pneumatic 5.8.6.1 to 5.8.6.3 4.8
substances processed, used or systems and their controls;
exhausted by machinery, for example: toxic work materials
Hazards resulting from contact with or
inhalation of harmful fluids, gases, mists,
fumes and dusts
Fire or explosion hazards Exhaust ventilation and dust 5.8.6.4 4.8
collection equipment
Hazards generated by neglecting The working position and 5.8.7 4.9
ergonomic principles in machine design controls for operators and
(mismatch of machinery with human maintenance staff handling
characteristics and abilities) caused, for tools
example, by unhealthy postures or
excessive efforts
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5 Safety requirements and measures
5.1 Introduction
The hydraulic presses covered by this standard range in size from small high speed machines with a single
operator producing small workpieces to large relatively slow speed machines with several operators and large
complex workpieces.
The methods or measures to be implemented to eliminate the significant hazards or reduce their associated
risks are detailed in this clause in the following manner:
basic design considerations for major press components or systems (see 5.2);
safeguarding against mechanical hazards in the tools area under different modes of production (see 5.3
and tables 2, 3 and 4);
protection against hazards due to control system or control component failures (see 5.4);
safeguarding against hazards which can occur during toolsetting, trial strokes, maintenance and
lubrication (see 5.5);
safeguarding against other hazards (see 5.6 to 5.8).
5.2 Basic design considerations
5.2.1 Prevention of unintended gravity fall during production
5.2.1.1 Where there is a risk of injury (force exceeding 150 Newton), measures shall be provided to
prevent an unintended gravity fall of the slide/ram in the production mode with manual or automatic feed or
removal, see tables 2 and 3. Such a fall may be due to a failure of the hydraulic system, mechanical failure or
a failure of the electrical control system. The risk shall be prevented by either:
a mechanical restraint device;
a hydraulic restraint device, as defined in 5.2.1.2;
a combination of a single valve hydraulic restraint device and a mechanical restraint device.
The restraint devices shall operate automatically and shall be effective whenever the tool is stopped and
operator access to the tools is possible.
5.2.1.2 Where mechanical restraint is not used and the risk of injury from a gravity fall exists, the hydraulic
restraint devices shall consist either of:
a) two separate hold-up or return cylinders each with a hydraulic restraint valve, capable of independently
holding the slide/ram, or
b) two hydraulic restraint valves, one of which is fitted as close as possible to the cylinder outlet, using
flanged or welded pipework, capable of holding the slide/ram.
5.2.1.3 On a press made solely for:
automatic operation
use with closed tools
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use with fixed enclosing guards
use with slow closing speed and hold-to-run control (see 5.3.18)
a single valve hydraulic restraint device, or a mechanical restraint device, shall be provided as a minimum.
5.2.1.4 There shall be a system for automatically checking that the restraint system as defined in 5.2.1.1 is
functioning correctly, and no press stroke shall be possible after any of the systems has failed (see figure D.1
and 5.4.1.2).
5.2.1.5 See also 5.4.1.2 and 5.4.1.3 on the control system requirements to prevent uncovenanted strokes.
5.2.2 Prevention of gravity fall during maintenance or repair
5.2.2.1 Where there is a risk of injury (force exceeding 150 Newton) from a gravity fall of the slide/ram, a
mechanical restraint device, e.g. a scotch, shall be provided to be inserted in the press for use during repair or
any necessary intervention between the tools other than normal manual feeding.
NOTE The risk of injury will not occur between the tools of an upstroking press, but can occur below the moving tool.
Where the device is not capable of absorbing the entire press force, it shall be interlocked to the press control
so that a closing stroke cannot be performed while the device is in position, and the press slide/ram is retained
in the upper position (see EN 1037).
5.2.2.2 On presses with an opening stroke length of more than 500 mm and a depth of table of more than
800 mm, the device shall be permanently fixed and integrated with the press. If an integrated device, when
active, cannot be easily seen from the operator's position, an additional clear indication of the position of the
device shall be provided.
5.2.2.3 Where the gravity restraint device provided as protection during production is mechanically linked
to a main guard which has to be removed for maintenance purposes, additional mechanical restraint devices,
which can be manually positioned where necessary, shall be provided.
5.2.3 Hydraulic and pneumatic systems - Common features
5.2.3.1 The general requirements in EN 982 and 983 shall be taken into consideration in designing
hydraulic and pneumatic systems, which shall comply with t
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