SIST EN 1760-2:2002
(Main)Safety of machinery - Pressure sensitive protective devices - Part 2: General principles for the design and testing of pressure sensitive edges and pressure sensitive bars
Safety of machinery - Pressure sensitive protective devices - Part 2: General principles for the design and testing of pressure sensitive edges and pressure sensitive bars
This standard contains requirements for pressure sensitive edges and bars for use as safety devices. The standard applies to pressure sensitive edges and bars used to detect persons or parts of persons who may be exposed to contact with hazardous moving parts. The purpose of this standard related primarily to safety and reliability rather than suitability. For the relationship between safety and reliability, see EN 954-1, annex D.
Sicherheit von Maschinen - Druckempfindliche Schutzeinrichtungen - Teil 2: Allgemeine Leitsätze für die Gestaltung und Prüfung von Schaltleisten und Schaltstangen
Diese Norm beinhaltet Anforderungen an Schaltleisten und Schaltstangen, die als Schutzeinrichtungen eingesetzt werden. Diese Norm gilt für Schaltleisten und Schaltstangen, die Personen oder deren Körperteile erkennen, die durch gefahrbringende Bewegungen gefährdet werden können. Diese Norm hat in erster Linie die Sicherheit und Zuverlässigkeit, und nicht die Eignung, zum Ziel. Für die Beziehung zwischen Sicherheit und Zuverlässigkeit, siehe prEN 954-1, Anhang D.
Sécurité des machines - Dispositifs de protection sensibles a la pression - Partie 2 : Principes généraux de conception et d'essais des bords et barres sensibles a la pression
La présente norme comporte des prescriptions relatives aux bords et aux barres sensibles a la pression, destinés a etre utilisés comme dispositifs de protection et non comme dispositifs d'actionnement pour un fonctionnement normal. La présente norme s'applique aux bords et barres sensibles a la pression servant a détecter la présence de personnes ou de parties du corps humain susceptibles d'etre exposées a un risque comme celui que représentent des parties mobiles dangereuses.
L'objet de la présente norme concerne plus la sécurité et la fiabilité que l'aptitude a l'usage. En ce qui concerne la relation entre sécurité et fiabilité, voir l'annexe D de l'EN 954-1:1996.
La présente norme spécifie des prescriptions relatives aux bords et barres sensibles a la pression avec et sans mécanisme de réarmement extérieur.
La présente norme se limite au fonctionnement des bords et barres sensibles a la pression et ne spécifie pas les prescriptions relatives a leur application. Toutefois, l'article 6 comporte des prescriptions relatives aux informations d'utilisation, qui doivent etre fournies par le fabricant. Une procédure de sélection figure a l'annexe C.
Les notes de conception figurant a l'annexe D constituent un guide supplémentaire pour la conception de bords et barres sensibles a la pression qui assureront un fonctionnement sur et fiable. Les notes de l'annexe E constituent un guide général pour l'application, alors que l'annexe G constitue un guide pour l'application des capteurs, en particulier pour les systemes a impulsion d'air.
La présente norme ne spécifie pas les dimensions des bords ou barres sensibles a la pression pour une application particuliere.
La présente norme ne s'applique pas aux dispositifs d'arret selon l'EN 60204-1 qui sont uniquement utilisés pour le fonctionnement normal, y compris les dispositifs d'arret d'urgence des machines.
Varnost strojev - Varovalne naprave, občutljive na tlak - 2. del: Splošna načela načrtovanja in preskušanja robov in drogov, občutljivih na dotik
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 1760-2:2002
01-september-2002
9DUQRVWVWURMHY9DURYDOQHQDSUDYHREþXWOMLYHQDWODNGHO 6SORãQDQDþHOD
QDþUWRYDQMDLQSUHVNXãDQMDURERYLQGURJRYREþXWOMLYLKQDGRWLN
Safety of machinery - Pressure sensitive protective devices - Part 2: General principles
for the design and testing of pressure sensitive edges and pressure sensitive bars
Sicherheit von Maschinen - Druckempfindliche Schutzeinrichtungen - Teil 2: Allgemeine
Leitsätze für die Gestaltung und Prüfung von Schaltleisten und Schaltstangen
Sécurité des machines - Dispositifs de protection sensibles a la pression - Partie 2 :
Principes généraux de conception et d'essais des bords et barres sensibles a la pression
Ta slovenski standard je istoveten z: EN 1760-2:2001
ICS:
13.110 Varnost strojev Safety of machinery
SIST EN 1760-2:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN 1760-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2001
ICS 13.110
English version
Safety of machinery - Pressure sensitive protective devices -
Part 2: General principles for the design and testing of pressure
sensitive edges and pressure sensitive bars
Sécurité des machines - Dispositifs de protection sensibles Sicherheit von Maschinen - Druckempfindliche
à la pression - Partie 2: Principes généraux de conception Schutzeinrichtungen - Teil 2: Allgemeine Leitsätze für die
et d'essais des bords et barres sensibles à la pression Gestaltung und Prüfung von Schaltleisten und
Schaltstangen
This European Standard was approved by CEN on 13 January 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1760-2:2001 E
worldwide for CEN national Members.
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EN 1760-2:2001
CONTENTS
1 Scope 9
2 Normative references 10
3 Terms and definitions 12
4 Requirements 19
4.1 Effective sensing surface 19
4.2 Actuating force (see 7.4 and 7.5 for test method) 20
4.3 Pre-travel (see 7.6.1 for test method) 20
4.4 Overtravel (see 7.6.3 for test method) 20
4.5 Working travel (see 7.6.2 for test method) 20
4.6 Force-travel relationship(s) (see 7.6 for test method) 21
4.7 Minimum operating speed (see 7.5 for test method) 22
4.8 Number of operations (see 7.7 for test method) 22
4.8.1 Single sensors (see 7.7.1 for test method) 22
4.8.2 Combination of sensors (see 7.7.2 for test method) 22
4.9 Sensor output (see 7.8 for test method) 22
4.10 Response of output signal switching device to the actuating force (see 7.8 and 7.9 for test
method) 22
4.10.1For systems where the sensor output remains in the OFF state for as long as the actuating
force is applied. 22
4.10.2For systems where the sensor output does not stay in the OFF state when the actuating
force remains 23
4.11 Reset function (see 7.9 for test method) 23
4.12 Environmental conditions (see 7. 10 for test method) 23
4.12.1Climatic conditions (see 7.10.2 and 7.10.3 for test method) 23
4.12.2Electromagnetic compatibility (see 7.10.4 for test method) 23
4.12.3Vibration (see 7.10.5 for test method) 23
4.12.4Bump (see 7.10.6 for test method) 24
4.13 Power supply variation 24
4.13.1Electrical power supply variation (see 7.11.1 for test method) 24
4.13.2Non-electrical power supply variations (see 7.11.2 for test method) 24
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EN 1760-2:2001
4.14 Electrical equipment (see 7.12.1 for test method) 24
4.14.1General 24
4.14.2Protection against electric shock 25
4.14.3Protection against overcurrent 25
4.14.4Electromechanical devices 25
4.14.5Pollution degree 25
4.14.6Clearance, creepage distances and isolating distances 25
4.14.7Wiring 25
4.15 Pneumatic equipment (see 7.12.2 for test method) 25
4.16 Hydraulic equipment (see 7.12.3 for test method) 25
4.17 Enclosure (see 7.13 for test method) 25
4.17.1Sensor 25
4.17.2Control unit and output signal switching device 25
4.18 Additional coverings for sensors (see 7.14 for test method) 25
4.19 Access (see 7.15 for test method) 26
4.20 Categories according to EN 954-1 (see 7.16 for test method) 26
4.21 Adjustments (see 7.17 for test method) 26
4.22 Sensor fixing and mechanical strength (see 7.18 for test method) 26
4.23 Recovery after deformation (see 7.19 for test method) 26
4.24 Connections (see 7.20 for test method) 27
4.25 Sharp corners, sharp edges and rough surfaces (see 7.21 for test method) 27
4.26 Mechanical features (see 7.22 for test method) 27
4.27 Inhibition and blocking (see 7.25 for test method) 27
5 Marking (see 7.23 for test method) 27
6 Information for selection and use (see 7.3 and 7.24 for test method) 28
6.1 General 28
6.2 Essential data for the selection of a suitable device(s) 28
6.3 Information for use 29
6.3.1 Information for installation and commissioning 29
6.3.2 Information relating to the operation of the device 30
7 Verification of requirements 31
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EN 1760-2:2001
7.1 Test samples 31
7.1.1 Sensor 31
7.1.2 Control units and output signal switching devices 32
7.2 Test pieces 32
7.3 Test number 1: Safety-related data for selection, installation, commissioning, operation and
maintenance of a suitable device(s) (see 6.2 and 6.3) 32
7.4 Test number 2: Mounting orientations of sensors (see 3.20 and figure 5) 32
7.4.1 Edge sensors 32
7.4.2 Bar sensors 33
7.5 Test number 3: Actuating force (requirements see 4.2) 33
o
7.5.1 Single sensor at 20 C33
o
7.5.2 Combination of sensors at 20 C34
7.5.3 Single sensor over the operating temperature range 36
7.5.4 Combination of sensors over the operating temperature range 37
7.6 Test number 4: Force-travel relationship(s) (requirements see 4.6) 39
7.6.1 Pre-travel (requirements see 4.3) 39
7.6.2 Working travel (requirements see 4.5) 39
7.6.3 Overtravel (requirements see 4.4) 39
7.7 Test number 5: Number of operations (requirements see 4.8) 40
7.8 Test number 6: Output state of the sensor and the output signal switching device
(requirements see 4.9 and 4.10) 40
7.9 Test number 7: Response of output signal switching device to the actuating force, the reset
and the state of the power supply (requirements see 4.10 and 4.11) 40
7.10 Test number 8: Environmental tests (requirements see 4.12) 40
7.10.1Functional test 40
7.10.2Test number 8.1: Operating temperature range (requirements see 4.12.1) 41
7.10.3Test number 8.2: Humidity (requirements see 4.12.1) 41
7.10.4Test number 8.3: Electromagnetic compatibility (requirements see 4.12.2) 41
7.10.5Test number 8.4: Vibration (requirements see 4.12.3) 42
7.10.6Test number 8.5: Bump (requirements are only for bars: see 4.12.4) 42
7.11 Test number 9: Power supply variation (requirements see 4.13) 43
7.11.1Test number 9.1: Electrical power supply variation (requirements see 4.13.1) 43
7.11.2Test 9.2: Non-electric power supply variations (requirements see 4.13.2) 43
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EN 1760-2:2001
7.12 Test number 10: Electrical, pneumatic and hydraulic equipment (requirements see 4.14,
4.15 and 4.16) 43
7.12.1Test number 10.1: Electrical equipment (requirements see 4.14) 43
7.12.2Test number 10.2: Pneumatic equipment (requirements see 4.15) 43
7.12.3Test number 10.3: Hydraulic equipment (requirements see 4.16) 43
7.13 Test number 11: Enclosure (requirements see 4.17) 43
7.14 Test number 12: Additional coverings for sensors (requirements see 4.18) 43
7.15 Test number 13: Access (requirements see 4.19) 43
7.16 Test number 14: Category(ies) (requirements see 4.20) 43
7.17 Test number 15: Adjustments (requirements see 4.21) 44
7.18 Test number 16: Sensor fixing (requirements see 4.22) 44
7.19 Test number 17: Recovery after deformation (requirements see 4.23) 44
7.20 Test number 18: Connections (requirements see 4.24) 44
7.21 Test number 19: Sharp corners, sharp edges and rough surfaces (requirements see 4.25) 44
7.22 Test number 20: Mechanical features (requirements see 4.26) 44
7.23 Test number 21: Marking (requirements see clause 5) 44
7.24 Test number 22: Information for selection and use (requirements see clause 6) 44
7.25 Test number 23: Inhibition and blocking (requirements see 4.27) 44
Annex A (normative) Timing diagrams for devices with and without reset 45
Annex B (informative) Explanatory notes 49
Overtravel and total travel 50
Annex C (informative) Notes to the machinery manufacturer/user 51
C.1 Introduction 51
C.2 Selection of suitable devices 51
C.2.1 General 51
C.2.2 Selection procedure 52
Annex D (informative) Design notes 53
D.1 General 53
D.1.1 Frequency of operation 53
D.1.2 Components 53
D.1.3 Affects of liquid 53
D.2 Pressure sensitive edges 53
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EN 1760-2:2001
D.2.1 Profile material 53
D.2.2 Sensor sensitivity 53
D.2.3 Physical effects 53
D.2.4 Pressure sensitive edges with electric sensors 53
D.2.5 Pressure sensitive edges with air pulse sensors 54
D.2.6 Pressure sensitive edges with fibre optic sensors 54
D.3 Pressure sensitive bars 54
D.3.1 Use of position detection switches 55
D.3.2 Trap points 55
Annex E (informative) Application notes 56
E.1 Sensor mounting 56
E.2 Environmental considerations 56
E.3 Sensor positioning 56
Annex F (informative) Installation, commissioning and test 57
F.1 System information 57
F.2 Commissioning 57
F.3 Regular inspection and tests 58
F.4 Inspection and tests after maintenance 58
Annex G (informative) General considerations for systems meeting category 2 according to EN
954-1 59
G.3 Air-pulse sensors 59
Annex ZA (informative) Clauses of this European Standard addressing essential requirements or
other provisions of EU directives 60
Bibliography 61
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EN 1760-2:2001
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 114 "Safety of
machinery", the secretariat of which is held by DIN.
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 2001, and conflicting national standards shall
be withdrawn at the latest by August 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
Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
standard.
This is the second part of a multi-part type B Standard which will cover safety devices that detect the
presence of a person through the application of a pressure or force by a part of the person's body.
After actuation the safety devices give a stop command which is used by the control system of the
machine to provide protection for the person who caused the device to be actuated.
The other parts of the standard cover:
Part 1: Safety of machinery - Pressure sensitive protective devices - General principles for the design
and testing of pressure sensitive mats and pressure sensitive floors.
Part 3: Safety of machinery - Pressure sensitive protective devices - General principles for the design
and testing of pressure sensitive bumpers and plates including pressure sensitive wires and barriers.
(under preparation)
Normative annex A presents timing diagrams for devices with and without reset. Informative annex B
explains the relationship between operating speed, the force exerted on the body and the distance
travelled by the device following actuation. The notes in informative annex C provide guidance to
users on the selection of a suitable device. It is recommended that the supplier and customer liase to
examine carefully the constraints presented by the application before placing an order for the
equipment.
The safeguarding of machinery (see 3.19 of EN 292-1:1991) can be achieved by many different
means. These means include guards which prevent access to the hazard zone by means of a
physical barrier (e.g. fixed guards to EN 953 and interlocking guards to EN 1088); and protective
devices, (e.g. electro-sensitive protective equipment to EN 61496 and pressure-sensitive protective
devices to this standard).
Type C standards makers and designers of machinery / installations should consider the best way to
achieve the required level of safety taking into account the intended application and the results of the
risk assessment (see EN 1050). The best solution may combine several of these different means. It is
recommended that the machinery / installation supplier and the user examine together carefully the
existing constraints before making their decision on the choice of safeguarding means.
The notes in informative annex D give guidance regarding the design of pressure sensitive edges and
pressure sensitive bars. Informative annex E gives guidance on the application of pressure sensitive
edges and pressure sensitive bars. Informative annex F gives guidance on installation, commissioning
and testing. Informative annex G covers general considerations for meeting category 2 according to
EN 954-1.
This European Standard does not specify the dimensions or the configuration of the effective sensing
surface of pressure sensitive edges or pressure sensitive bars in relation to any particular application.
However, there is a requirement for the manufacturer of any safety device to provide sufficient
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EN 1760-2:2001
information to enable the user (i.e. the machinery manufacturer and / or the user of the machinery) to
specify an adequate arrangement.
According to the CEN/CENELEC 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,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
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EN 1760-2:2001
Introduction
Pressure sensitive edges and pressure sensitive bars are safety devices of the "mechanically
actuated trip device" type (see 3.23.5 of EN 292-1:1991). General requirements for these devices (as
well as other safety devices) are given in 4.1 and 4.2 of EN 292-2:1991.
Pressure sensitive edges and bars are used in a wide range of applications with different conditions of
use relating, for example, to loading, electrical, physical and chemical environments. They are
interfaced with machine controls to ensure that the machine reverts to a safe condition if the device is
actuated.
Pressure sensitive edges and pressure sensitive bars may be fitted to a moving part of a machine at
the point where a trapping, crushing or collision hazard may occur. They may also be fitted to a fixed
part of a machine or an obstacle to prevent trapping or crushing hazards with a moving part of a
machine. Pressure sensitive edges and pressure sensitive bars are designed, selected, installed
and/or interfaced with the control system of the machine so that the force/pressure applied to a person
or parts of the body do not exceed certain limits.
This European standard is a type B standard as stated in EN 1070.
Pressure sensitive edges, bars, bumpers and barriers have many similarities. The following table
summarises the differences which generally apply between the devices and gives guidance for their
application.
Table 1 — Characteristic features of pressure sensitive devices excluding mats and floors
Edge Bar Bumper
Part 2 Part 3
Cross section regular regular regular /
irregular
Length/Width >1 any ratio any ratio
ratio
Effective sensing deflects moves as a deflects locally
surface locally whole and / or moves
as a whole
Intended to finger finger
detect hand hand hand
arm arm arm
leg leg leg
head head head
torso torso torso
1 Scope
This standard contains requirements for pressure sensitive edges and pressure sensitive bars for use
as safety devices and not as actuating devices for normal operational. The standard applies to
pressure sensitive edges and pressure sensitive bars used to detect persons or parts of persons who
may be exposed to danger such as hazardous moving parts.
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EN 1760-2:2001
The purpose of this standard relates primarily to safety and reliability rather than suitability. For the
relationship between safety and reliability, see annex D of EN 954-1:1996.
This standard specifies requirements for pressure sensitive edges and pressure sensitive bars with
and without an external reset facility.
This standard is restricted to the functioning of pressure sensitive edges and pressure sensitive bars
and does not specify the requirements for their application. However, clause 6 contains requirements
for information for use which has to be provided by the manufacturer. A selection procedure is given
in annex C.
The design notes in annex D give additional guidance regarding the design of pressure sensitive
edges and pressure sensitive bars which will give safe and reliable service. The notes in annex E
provide general guidance regarding application, while annex G provides guidance on the application of
sensors, especially for air-pulse systems.
This standard does not specify the dimensions of the pressure sensitive edges or bars in relation to a
particular application.
The standard does not apply to stopping devices according to EN 60204-1 used only for normal
operational, including emergency stopping, of machinery. Additional requirements may be necessary
where pressure sensitive edges and pressure sensitive bars are used in locations accessible to elderly
or disabled people or children.
Note It may not be possible to carry out all the tests in this standard for pressure sensitive edges and
pressure sensitive bars when they have been designed and built into the machinery by its manufacturer.
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 below. For dated references, subsequent amendments or revisions 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
EN 954-1:1996, Safety of machinery - Safety-related parts of control systems - Part 1: General
principles for design
EN 982, Safety of machinery - Safety requirements for fluid power systems and their components –
Hydraulics
EN 983, Safety of machinery - Safety requirements for fluid power systems and their components –
Pneumatics
EN 1070, Safety of machinery – Terminology
EN 50081-1, Electromagnetic compatibility - Generic emission standard - Part 1: Residential,
commercial and light industry
EN 60068-2-6, Environmental testing - Part 2: Tests - Tests Fc: Vibration (sinusoidal) (IEC 60068-2-
6:1995 + Corrigendum 1995)
EN 60068-2-14, Environmental testing - Part 2: Tests - Test N: Change of temperature (IEC 60068-2-
14:1984 + A1:1986)
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EN 1760-2:2001
EN 60068-2-29, Basic environmental testing procedures; part 2: tests; test Eb and guidance: bump
(IEC 60068-2-29:1987)
EN 60204-1:1997, Safety of machinery - Electrical equipment of machines - Part 1: General
requirements (IEC 60204-1:1997)
EN 60439-1:1999, Low-voltage switchgear and controlgear assemblies; part 1: type-tested and
partially type-tested assemblies (IEC 60439-1:1999)
EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 60947-5-1:1997, Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and
switching elements - Electromechanical control circuit devices (IEC 60947-5-1:1997)
EN 61000-4-2, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques -
Section 2: Electrostatic discharge immunity test - Basic EMC publication (IEC 61000-4-2:1995)
EN 61000-4-3, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques -
Section 3: Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:1995,
modified)
EN 61000-4-4, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques -
Section 4: Electrical fast transient/burst immunity test - Basic EMV publication (IEC 61000-4-4:1995)
EN 61000-4-5, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques -
Section 5: Surge immunity test (IEC 61000-4-5:1995)
EN 61000-4-6, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques -
Section 6: Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-
6:1996)
EN 61000-6-2, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity for
industrial environments (IEC 61000-6-2:1999)
EN 61496-1, Safety of machinery - Electro-sensitive 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 optoelectronic protective devices
prEN 61496-3:2000, Safety of machinery - Electro-sensitive protective equipment - Part 3: Particular
requirements for Active Opto-electronic Protective Devices responsive to Diffuse Reflection
(AOPDDR)
IEC 60068-2-3, Basic environmental testing procedures. Part 2: Tests. Test Ca: Damp heat, steady
state
IEC 60664-1, Insulation co-ordination for equipment within low-voltage systems; Part 1: Principles,
requirements and tests
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EN 1760-2:2001
3 Terms and definitions
The terms and definitions given in EN 1070 apply to this standard in addition to the terms and
definitions which follow.
3.1
pressure sensitive edge
safety device of the 'mechanically activated trip' type (see 3.23.5 of EN 292-1:1999) intended to detect
the touch of a person or part of a person and comprising:
a) sensor(s) which generates a signal when pressure is applied to part of its surface, where:
- the length is greater than the width;
- the cross section throughout the pressure sensitive area is constant;
- the width of the cross section is greater than 8 mm;
- the effective sensing surface is deformed locally to actuate the sensor(s);
NOTE The width of the cross section is usually less than or equal to 80 mm.
b) a control unit, which responds to the signal from the sensor and generates an output signal(s) to the
control system of a machine.
3.2
pressure sensitive bar
safety device (see 3.23 of EN 292-1:1991) comprising:
a) a sensor(s) which generates a signal when pressure is applied to part of its surface, where:
- the length is greater than the width;
- the cross section throughout the pressure sensitive area is constant;
- the width of the cross section is greater than 8 mm;
- the effective sensing surface moves as a whole to actuate the sensor(s).
NOTE 1 The width of the cross section is usually less than or equal to 80 mm.
NOTE 2 The surface of a pressure sensitive bar can also deform locally but the deformation does not actuate
the sensor(s).
b) a control unit, which responds to the signal from the sensor and generates an output signal(s) to the
control system of a machine.
3.3
sensor
that part of the pressure sensitive edge or pressure sensitive bar which generates a signal in response
to sufficient pressure applied to part of its surface.
3.4
control unit
that part of the pressure sensitive edge or pressure sensitive bar which responds to the condition of
the sensor and generates output signals to the machine control system.
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EN 1760-2:2001
1) Pressure sensitive edge or bar
2) Sensor(s)
3) Control unit (may be located within the machine control system enclosure or be part of the
machine control system)
4) Output signal switching device(s) (may be located within the machine control system
enclosure or be part of the machine control system)
5) Part of the machine control system for pressure sensitive edge/pressure sensitive bar output
signal processing
6) Actuating force
7) Sensor output signal
8) ON state/OFF state signal
9) Manual reset signal (where appropriate alternative to A)
10) Reset signal from machine control system (where appropriate)
11) Monitoring signals (optional)
A) Manual reset signal to the machine control system (where appropriate alternative to 9).
B) Machine control system(s)
Figure 1 — Pressure sensitive edge or pressure sensitive bar applied to a machine
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EN 1760-2:2001
3.5
output signal switching device
a part of the control unit of a pressure sensitive edge or pressure sensitive bar which is connected to
the machine control system and transmits output signals.
NOTE Definitions above describe the functional components of a pressure sensitive edge or bar. These
functions may be integrated into a single assembly or may be contained in any number of separate assemblies
(see figure 1).
For example a simple pressure sensitive edge or pressure sensitive bar actuating a position detection switch
may be considered to be the sensor, the control unit, and the output signal switching device.
3.6
ON state of output signal switching device(s)
the state in which the output circuit(s) is complete and permits the flow of current or fluid.
3.7
OFF state of output signal switching device(s)
the state in which the output circuit(s) is broken and interrupts the flow of current or fluid.
3.8
actuating force
any force applied to the sensor which causes the output signal switching device(s) to go to the OFF
state.
3.9
effective sensing surface
that part of the surface of the sensor or a combination of sensors within the effective sensing angle
and the effective sensing length where the application of an actuating force creates an OFF state in
the output signal switching device (see, for example, figures 2 and 3).
3.10
effective sensing length
the length of the effective sensing surface.
3.11
reference axis
a line in the direction of the length of the sensor, whose position in the cross-sectional view of the
sensor is used to define the effective sensing surface (see figures 2 and 3).
3.12
effective sensing angle
the angle around the reference axis, which limits the effective sensing surface along the effective
sensing length (see figures 2 and 3).
3.13
reference direction
that direction of actuation, from a point on the effective sensing surface towards the reference axis,
which bisects the effective sensing angle and is normal to the reference axis (see figures 2 and 3).
3.14
dead surface(s)
the part of the surface area of the sensor outside the effective sensing surface (see figures 2 and 3).
3.15
pre-travel
the distance travelled by an object, moving in a direction normal to the reference axis and in the axis of
the applied actuating force measured from where this object touches the effective sensing surface to
where the output signal switching device(s) changes to an OFF state under specified conditions (see
figure 4).
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EN 1760-2:2001
1 reference direction
2 reference axis
effective sensing surface
L effective sensing length
effective sensing angle
dead surface
see 7.4.1
Figure 2 — Effective sensing surfaces of pressure sensitive edges
3.16
working travel
the distance travelled by an object, moving in a direction normal to the reference axis, from where this
object touches the effective sensing surface, under specified conditions, to where a stated limit force is
exerted on the object (see figure 4).
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EN 1760-2:2001
1 reference direction
2 reference axis
L effective sensing length
effective sensing surface
effective sensing angle
dead surface
see 7.4.1
Figure 3 — Effective sensing surface of pressure sensitive bars
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EN 1760-2:2001
a force (N) 1 stated limit force
b travel (mm) 2 lowest actuating force
c pre-travel
d overtravel at 250 N
e working travel at 250 N
f overtravel at 400 N
g working travel at 400 N
h total travel
A pre-travel (actuating
...
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