EN 693:2001+A2:2011

SLOVENSKI STANDARD
01-november-2011
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+A2:2011
ICS:
25.120.10 Kovaški stroji. Stiskalnice. Forging equipment. Presses.
Škarje Shears
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 693:2001+A2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2011
ICS 25.120.10 Supersedes EN 693:2001+A1:2009
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 and Amendment 2 approved by CEN on 25 July 2011.

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 and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 693:2001+A2:2011: E
worldwide for CEN national Members.

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. 22
5.5 Toolsetting, trial strokes, maintenance and lubrication . 25
5.6 Mechanical hazards - Other . 26
5.7 Slips, trips and falls . 27
5.8 Protection against other hazards . 27
6 Verification of the safety requirements and/or measures . 34
7 Information for use . 40
7.1 Marking . 40
7.2 Instruction handbook . 41
Annex A (normative) Calculation of minimum safety distances . 43
Annex B (normative) The response time of the hydraulic system . 45
Annex C (informative) Closed tools . 46
Annex D (informative) Interlocking devices associated with guards . 47
Annex E (informative) Electro-sensitive protective equipment (ESPE) using active opto-electronic
protective devices (AOPDs) . 50
Annex F (informative) Conditions for noise measurement of hydraulic presses . 51
Annex G (informative) The connection of the stopping time measurement equipment . 53
Annex ZA (informative) !Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC" . 55
Bibliography . 56

Foreword
This document (EN 693:2001+A2:2011) 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 March 2012, and conflicting national standards shall be withdrawn at
the latest by March 2012.
This document includes Amendment 1, approved by CEN on 2008-12-29 and Amendment 2, approved by
CEN on 2011-07-25.
This document supersedes #EN 693:2001+A1:2009$.
The start and finish of text introduced or altered by amendment is indicated in the text by tags ! "
and # $.
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
#For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.$
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.
Annexes A and B to this standard are normative, whereas Annexes C to #G and ZA$ 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, 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 and United Kingdom.

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.
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
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 61496-1:2004$, Safety of machinery - Electrosensitive protective equipment - Part 1: General
requirements and tests #(IEC 61496-1:2004, modified)$
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.

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.
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).
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).
Figure 1 — Example of box frame type hydraulic press (tools area safeguards not shown)

Figure 2 — Example of open front hydraulic press (tools area safeguards not shown)
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.
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
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
 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 the particular requirements in 5.2.3, 5.2.4 and
5.2.5.
5.2.3.2 Filters, pressure regulators and low pressure cut-off arrangements shall be provided.
5.2.3.3 Devices shall be provided to ensure that the permitted range of working pressure is maintained.
5.2.3.4 Transparent bowls (e.g. glass, plastic) shall be protected to prevent injury from flying particles,
without affecting visibility.
5.2.3.5 All piping, pipe fittings, passages, surge or storage tanks and cored or drilled holes, shall be free
from burrs or foreign matter which might cause damage to the system. See 5.3.4.2.3 of EN 982:1996 and
5.3.4.2.3 of EN 983:1996.
5.2.3.6 Each run of piping shall, where practicable, be continuous from one piece of apparatus to another.
Precautions shall be taken to prevent damage by thermal expansion. Rigid piping shall be securely supported
at frequent intervals to avoid vibration or movement. Care shall be taken to avoid kinking of flexible pipes used
to carry fluids. Such kinking can cause traps which prevent the fluid exhausting.
5.2.3.7 Where a drop in pressure could lead to unintended dangerous motion of the slide/ram, flexible
piping shall not be used; pipes and pipe connections shall be chosen to prevent such a loss of pressure. Such
pipe connections shall not be made with compression fittings, glued rings or similar devices. They shall be
made by means of positive connecting joints, or by the welding of two fitted surfaces.
5.2.3.8 Operating valves shall not depend on connected piping for support. This is to avoid undesirable
effects from vibration which might affect both valves and piping.
5.2.3.9 Control valves and other control components (e.g. regulators and manometers) shall be mounted in
positions which provide accessibility and avoid damage (see 5.2.1 of EN 982:1996).
5.2.3.10 Where valves are manually or mechanically (as distinct from electrically) operated, the
arrangements for restoring the valves shall be positive, i.e. when the actuator of the valve is released, the
valve shall automatically move to the safe position. See also 5.4.7.
5.2.4 Hydraulic systems
5.2.4.1 Controlled gravity descent may be a deliberate design feature to facilitate rapid closing of the tools.
In such a case, all the oil in the cylinder supporting the slide/ram shall be passed through the main control
valve or valves in a redundant and monitored system (R & M in table 2).
5.2.4.2 Hydraulic systems which include accumulators shall allow the fluid pressure to fall when the
pressure generating unit is disconnected from the energy supply; the stored energy shall not allow the
initiation of a further stroke. If this is impossible, the parts of the circuit which are maintained under pressure
shall be supplied with a manual discharge valve in addition to the other devices required by standards or rules
concerning accumulators (relief valves, pneumatic gauges, etc.) and bear a very clear indication (by means of
a descriptive plate) of the hazard.
5.2.4.3 The circuit shall be protected by pressure limiting valves. These valves shall not be capable of
alteration without the use of a tool; also they shall be set at a pressure which is no more than 10% higher than
the maximum operating pressure.
5.2.4.4 For downstroking presses, provision shall be made to protect the cylinder and components
containing the fluid in the lower part of the cylinder from damage due to pressure intensification. A relief valve
used for this purpose shall be direct operated, sealed and locked against unauthorised adjustment, and shall
be set at a pressure at least 10% above the maximum system pressure so that it only opens in the case of a
fault. The components it protects shall be designed to sustain the pressure at which the valve is set. The relief
valve shall be constructed so that, if a single break in the spring occurs, the space between the windings
remains less than one wire thickness. The spring shall be guided so as to maintain the function of the relief
valve.
5.2.5 Pneumatic systems
5.2.5.1 Where valves or other parts of the press control system require lubrication, visible automatic means
of lubrication shall be provided to introduce the oil into the air line in suitable form.
5.2.5.2 Where silencing systems are fitted, they shall be provided and installed in accordance with the
valve manufacturer's instructions for use in safety systems and shall not affect safety functions.
5.2.5.3 Water separators shall be provided.
5.2.6 Electrical systems
5.2.6.1 The electrical system shall comply with EN 60204-1 in full.
5.2.6.2 The designer of a press should consider whether the limits of the electrical supply, the physical
environment as well as the operating conditions of some components are different to those in 4.3 and 4.4 of
EN 60204-1:1997. In this case, the choice of the relevant components has to be made in this respect.
5.2.6.3 The emergency stop shall function as a category 0 stop (see 9.2.5.4 of EN 60204-1:1997 and
5.4.6.2).
5.2.6.4 Two-hand control devices shall conform for the mode of production: single cycle, manual feed or
removal to 5.3.16 and table 2 and to 5.5.7 for tool-setting, maintenance and lubrication.
5.2.6.5 The minimum degree of protection for the operator interface and press-mounted control devices
shall be of at least IP 54 (see 10.1.2 of EN 60204-1:1997).
5.2.6.6 Enclosures of control gear shall provide a degree of protection of at least IP 54 (see 12.3 of
EN 60204-1:1997).
5.2.6.7 The identification of other conductors than the neutral or protection conductors shall be in
accordance with the choices mentioned in 14.2.4 of EN 60204-1:1997.
5.3 Mechanical hazards in the tools area
5.3.1 The major danger zone at hydraulic presses is the tools area and preventive measures shall be taken
to deal with the relevant hazards. This standard indicates in 5.3 to 5.5 how the danger zone at the tools and
associated areas, such as moving die cushions, blanking holders and workpiece ejectors, shall be
safeguarded. Tables 2, 3 and 4 list the safeguarding methods including mode of production, mode of cycle
initiation, mode of operation and the requirements for the design of the control and monitoring systems:
 single cycle: manual feed or removal (table 2)
 automatic cycle: manual feed or removal (table 3)

 automatic cycle: solely automatic feed and removal (table 4).

5.3.2 Safeguarding measures described in EN 292 – 1 and 2 which are appropriate to the safeguarding of
any operator at the tools are listed below. Designers, manufacturers and suppliers shall select the
safeguarding methods which reduce the risks as far as possible, considering the significant hazards (see
table 1) and the mode of production (see tables 2, 3 and 4):
a) closed tools (see EN 294, EN 349, 5.3.4, 5.3.9 and annex C);
b) fixed enclosing guards (see EN 294, EN 953, 5.3.4, and 5.3.10);
c) interlocking guards with or without guard locking (see EN 953, EN 1088, 5.3.11, 5.3.13, 5.3.17 and
annex D);
d) control guards with or without guard locking (see 4.2.2.5 of EN 292-2:1991/A1:1995, EN 953, EN 1088,
5.3.11, 5.3.13, 5.3.17 and annex D);
e) early opening interlocking guards with or without guard locking (see EN 953, EN 999, EN 1088, 5.3.11,
5.3.13, 5.3.14, 5.3.17 and annex D);
f) electro-sensitive protective equipment (ESPE) using active opto-electronic protective devices (AOPDs)
(see EN 999, EN 61496-1, prEN 61496-2, 5.3.15, 5.3.17 and annex E);
g) two-hand control devices (see EN 574, EN 999, 5.3.16 and 5.3.17);
h) hold-to-run control devices (see 3.23.3 of EN 292-1:1991) with a slow closing speed (equal or less than
10 mm/s, see 5.3.18) principally for toolsetting (see 5.5).
5.3.3 The selected combination of safeguarding measures described in 5.3.2 shall protect all exposed
persons, i.e. those who may gain access to the danger zone during operation, setting, maintenance, cleaning
and inspection activities, as described in 4.2.
5.3.4 Where a hydraulic press is capable of being manually loaded and/or unloaded, the safeguarding
method shall not rely solely on the use of closed tools or fixed enclosing guard(s) unless the closed tools or
fixed enclosing guard(s) is supplied as a part of the press for a single specific purpose (see 7.2. j) and k)).
5.3.5 The requirements of the safety measures listed in 5.3.2 are given in 5.3.9 to 5.3.18 and shall be met in
addition to those established by the relevant standards (see clause 2).
5.3.6 The provided guards and protective devices shall be at least interfaced with the control system of the
press in the same category as required for these guards and devices.
5.3.7 If the work performed on the press requires access to the danger zone from more than one side,
arrangements shall be provided for the fitting of a guard or a device giving the same level of protection for the
operator on each side.
5.3.8 Where a very large press may be used for special "one-off" pressing of large components, for example
pressure vessel ends, and use of a guard is impracticable, the designer, manufacturer and supplier shall
make provision as necessary for allowing in such cases a safe method of work to be applied by the user, for
example provision of controls to be moved to a safe position with a good view of the tools/workpiece and if
necessary additional audible warnings or visual danger signals (see EN 842). If this press is not exclusively
dedicated to this work, clauses 5.3.2 to 5.3.7 shall apply.
5.3.9 Closed tools shall be inherently safe. Their openings and the corresponding distances shall meet the
requirements laid down in table 4 of EN 294:1992 or not exceed 6 mm. Any additional crushing hazard outside
the closed tools shall be avoided following table 1 of EN 349:1993 (see annex C).
5.3.10 Fixed enclosing guards shall comply with EN 953. They shall be firmly secured to the machine,
another rigid structure or the floor. The feed opening shall comply with table 4 of EN 294:1992.
5.3.11 Interlocking guards and control guards shall comply with EN 953 and prevent, in conjunction with fixed
guards, access to the danger zone in the tools area during any dangerous movement. Initiation of the stroke
shall be prevented until the guard gate is closed. The associated interlocking devices shall be designed and
constructed in accordance with 6.2.2 of EN 1088:1995, and the safety related parts of its control system shall
conform to category 4 of EN 954-1:1996. Control guards shall also conform to 3.22.6 of EN 292-1:1991 and
4.2.2.5 of EN 292-2:1991.
5.3.12 Using an interlocking guard as a control guard, it shall not be possible to stand between the guard and
the danger zone. This can be prevented using additional safeguarding means. These additional safeguarding
means shall either be an AOPD (type 4) or a fixed guard kept in place permanently (e.g. by welding) or an
interlocking guard in accordance with clause 6.2.1 of EN 1088.
Control guards shall only be used when the opening stroke length is equal to or less than 600 mm and the
depth of the press table is equal to or less than 1000 mm. These restrictions do not apply when the control
guard is controlled by a hold–to–run control device.
The control guard(s) shall be securely held open (e.g. by spring or counterweight) to avoid gravity fall which
can cause unintended cycle initiation.
5.3.13 The guards mentioned in 5.3.11 shall be provided
a) either with guard locking, to prevent the opening of the guard gate until any dangerous movement in the
tools area has ceased;
b) or without guard locking, but designed to bring the dangerous movement to a stop before the danger
zone can be reached.
5.3.14 Where an interlocking guard or a control guard has an early opening feature, it shall function as an
early opening interlocking guard (see 3.8).
5.3.15 ESPE using AOPD in the form of light curtain shall comply with the following:
a) AOPDs shall conform to type 4 of #EN 61496–1:2004$, and be designed and constructed according
to prEN 61496-2:1997;
b) access to the danger zone shall only be possible through the detection zone of the AOPD. Additional
safeguarding shall prevent access to the danger zone from any other direction;
c) where it is possible to stand in a position between a AOPD and the danger zone of the press, additional
means, for example further beams, shall be provided to detect a person standing there. The maximum
permissible undetected gap shall be equal to or less than 75 mm;
d) it shall not be possible to initiate any dangerous movement while any part of the body is interrupting the
AOPD;
e) the means of resetting shall be so positioned that, from that position, there is a clear view of the danger
zone. There shall not be more than one reset control device on each detection zone. If the press is
safeguarded by means of side and back AOPDs, a reset control device shall be provided on each
detection zone;
f) where the AOPD operates by reflecting the transmitted light beam back along its own path and additional
reflector(s) are placed within the detection zone, then the configuration of the additional reflector(s) shall
not allow an item of thickness equal to or greater than the specified test piece size (see 4.1.2 of
EN 61496-2:1998) to be undetected by the AOPD within the whole of the detection zone, unless other
measures are taken to ensure that it is not possible to reach the danger zone;
g) where the AOPD is also used for cycle initiation, either single or double break:
i) the height of the press table shall be equal to or more than 750 mm above the standing level of
the operator. If the table is less than 750 mm in height, this height shall be achieved by the use
of an additional guard(s); this guard and all other guards preventing access to the tools area
shall be kept in place permanently, e.g. by welding, or by the use of an interlocking guard. It
shall not be possible to stand between the physical barrier and the table or tools, or beside the
table or tools;
ii) the opening stroke length shall be equal to or less than 600 mm and the depth of the press table
shall be equal to or less than 1000 mm;
iii) the detection capability shall not exceed 30 mm (see table A.1)
iv) before the first cycle initiation, the reset fu
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