Safety of machinery - Interlocking devices associated with guards - Principles for design and selection (ISO/DIS 14119:2021)

Sicherheit von Maschinen - Verriegelungseinrichtungen in Verbindung mit trennenden Schutzeinrichtungen - Leitsätze für Gestaltung und Auswahl (ISO/DIS 14119:2021)

Diese Internationale Norm legt Leitlinien für die Gestaltung und Auswahl – unabhängig von der Art der Energiequelle – von Verriegelungseinrichtungen in Verbindung mit trennenden Schutzeinrichtungen fest und enthält eine Anleitung für Maßnahmen, mit denen die Möglichkeit des Umgehens von Verriegelungseinrichtungen in vernünftigerweise vorhersehbarer Art und Weise auf ein Mindestmaß verringert wird.
Diese Internationale Norm behandelt Teile von trennenden Schutzeinrichtungen, die Verriegelungseinrichtungen betätigen, und deckt Grundsätze für die Gestaltung, Auswahl und Anwendung von Verriegelungseinrichtungen mit Schlüsseltransfersystem sowie Systemen für Maschinenanwendungen ab, unabhängig von der Energieart, die für deren Steuerung genutzt wird oder die diese selbst steuern.
ANMERKUNG ISO 14120 legt allgemeine Anforderungen an die Gestaltung und die Konstruktion von trennenden Schutzeinrichtungen fest, die hauptsächlich dafür vorgesehen sind, Personen vor mechanischen Gefährdungen zu schützen. Die Verarbeitung des von der Verriegelungseinrichtung ausgehenden Signals zum Anhalten der Maschine und um deren unerwarteten Anlauf zu verhindern, wird in ISO 13849-1 oder IEC 62061:2015 behandelt.

Sécurité des machines - Dispositifs de verrouillage associés à des protecteurs - Principes de conception et de choix (ISO/DIS 14119:2021)

Varnost strojev - Zaporne naprave, povezane z varovali - Načela za načrtovanje in izbiro (ISO/DIS 14119:2021)

General Information

Status
Not Published
Public Enquiry End Date
21-Mar-2021
Technical Committee
Current Stage
4020 - Public enquire (PE) (Adopted Project)
Start Date
21-Jan-2021
Due Date
10-Jun-2021
Completion Date
19-Apr-2021

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SLOVENSKI STANDARD
oSIST prEN ISO 14119:2021
01-marec-2021
Varnost strojev - Zaporne naprave, povezane z varovali - Načela za načrtovanje in
izbiro (ISO/DIS 14119:2021)
Safety of machinery - Interlocking devices associated with guards - Principles for design
and selection (ISO/DIS 14119:2021)
Sicherheit von Maschinen - Verriegelungseinrichtungen in Verbindung mit trennenden
Schutzeinrichtungen - Leitsätze für Gestaltung und Auswahl (ISO/DIS 14119:2021)
Sécurité des machines - Dispositifs de verrouillage associés à des protecteurs -
Principes de conception et de choix (ISO/DIS 14119:2021)
Ta slovenski standard je istoveten z: prEN ISO 14119
ICS:
13.110 Varnost strojev Safety of machinery
oSIST prEN ISO 14119:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 14119:2021

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oSIST prEN ISO 14119:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 14119
ISO/TC 199 Secretariat: DIN
Voting begins on: Voting terminates on:
2021-01-06 2021-03-26
Safety of machinery — Interlocking devices associated
with guards — Principles for design and selection
Sécurité des machines — Dispositifs de verrouillage associés à des protecteurs — Principes de conception
et de choix
ICS: 13.110
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 14119:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2021

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oSIST prEN ISO 14119:2021
ISO/DIS 14119:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

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oSIST prEN ISO 14119:2021
ISO/DIS 14119:2021(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Symbols and Abreviations .11
4 Operating principles and types of interlocking devices associated with guards .11
4.1 General .11
4.2 Principles of guard interlocking without guard locking .14
4.3 Principles of guard interlocking with guard locking .14
4.3.1 General.14
4.3.2 Interlocking device with mechanically or electromagnetically operated
guard locking . .15
5 Requirements for the design and the arrangements of interlocking devices with
and without guard locking .17
5.1 General .17
5.2 Arrangement and fastening of position switches and bolt locks .17
5.3 Arrangement and fastening of actuators .18
5.3.1 General.18
5.3.2 Cams .18
5.4 Actuation modes of Type 1 and Type 2 interlocking devices .18
5.5 Mechanical stop .19
5.6 Additional requirements on guard locking devices .19
5.6.1 General.19
5.6.2 Holding Force .20
5.6.3 Electromechanical guard locking device .20
5.6.4 Electromagnetic guard locking device .21
5.6.5 Trapped key solenoid controlled switch .22
5.6.6 Whole body access and supplementary release of guard locking .22
5.7 Interlock blocking . .24
6 Selection of an interlocking device.24
6.1 General .24
6.2 Selection of a guard locking device .24
6.2.1 Overall system stopping performance and access time .24
6.2.2 Specific requirements for selection of guard locking devices .25
6.2.3 Selection of supplementary guard locking releases .26
6.3 Controlling Access .27
6.4 Environmental conditions considerations .27
6.4.1 General.27
6.4.2 Influence of dust on Type 2 and Type 5 interlocking devices .27
6.5 Considerations for the application of Type 5 devices .28
7 Design to minimize the motivation to defeat interlocking devices .28
7.1 System design.28
7.2 Methodology procedure .28
7.3 Additional measures to minimize possibility of defeat . .29
7.4 Additional measures to minimize possibility of defeat for Type 5 devices .33
7.4.1 General.33
7.4.2 Key coding .33
7.4.3 Key retention .34
7.4.4 Reproduction of keys .34
7.4.5 Switch disconnectors .34
© ISO 2021 – All rights reserved iii

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8 Control requirements .35
8.1 General .35
8.2 Assessment of faults and fault exclusions .35
8.2.1 Assessment of faults .35
8.3 Measures to prevent common cause failures .38
8.3.1 Direct and non-direct mechanical action of the position switches of
Type 1 interlocking devices .38
8.3.2 Power medium diversity .39
8.4 Release of guard locking device .40
8.5 Logical series connection of interlocking devices .40
8.6 Electrical and environmental conditions .40
8.6.1 General.40
8.6.2 Performance considerations .41
8.6.3 Immunity from disturbance .41
8.6.4 Electrical operating conditions .41
8.6.5 Clearances and creepage distances .41
9 Information for use .41
9.1 General .41
9.2 Information for use given by the manufacturer of interlocking devices .41
9.2.1 Marking .41
9.2.2 Instructions .42
9.3 Information for use given by the manufacturer of the machine .43
Annex A (informative) Type 1 interlocking device — Examples .44
Annex B (informative) Type 2 interlocking device — Examples .49
Annex C (informative) Type 3 interlocking device — Example.51
Annex D (informative) Type 4 interlocking devices — Examples .53
Annex E (informative) Examples of other interlocking devices .55
Annex F (informative) Example of guard locking devices .56
Annex G (informative) Application examples of interlocking devices used within a safety
function .61
Annex H (informative) Motivation to defeat interlocking devices (Defeating of protective
devices) .67
Annex I (informative) Examples for maximum static action forces .73
Annex J (normative) Test procedures .75
Annex K (normative) Safety of machinery — Interlocking devices associated with guards —
Principles for design and selection .77
Annex L (normative) Type 5 interlocking devices — trapped key interlocking systems .93
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of 2006/42/EC aimed to be covered .111
Bibliography .114
iv © ISO 2021 – All rights reserved

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oSIST prEN ISO 14119:2021
ISO/DIS 14119:2021(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 199, Safety of machinery.
This second edition cancels and replaces the first edition (ISO 14119:2013), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— ISO/TS 19837 “Safety of machinery — Trapped key interlocking devices — Principles for design and
selection” is integrated as new normative Annex L with specific requirements for type 5 interlocking
devices ‑ key interlocking devices;
— “Trapped key interlocking systems” are defined as “Type 5 interlocking systems”;
— Table 4 is improved and renamed into “Additional measures in case foreseeable motivation for
defeat continues to exist depending on type of interlocking devices”;
— test procedures are described in a new normative Annex J;
— ISO/TR 24119 “Safety of machinery — Evaluation of fault masking serial connection of interlocking
devices associated with guards with potential free contacts” integrated in a new normative Annex K.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2021 – All rights reserved v

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Introduction
The structure of safety standards in the field of machinery is as follows:
a) Type‑A standards (basic safety standards) giving basic concepts, principles for design, and general
aspects that can be applied to all machinery;
b) Type‑B standards (generic safety standards) dealing with one safety aspect or one type of
safeguard that can be used across a wide range of machinery:
— Type‑B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);
— Type‑B2 standards on safeguards (e.g. two‑hand controls, interlocking devices, pressure‑
sensitive devices, guards);
c) Type‑C standards (machine safety standards) dealing with detailed safety requirements for a
particular machine or group of machines.
This document is a Type‑B2 standard as stated in ISO 12100.
The requirements of this document can be supplemented or modified by a Type‑C standard.
For machines which are covered by the scope of a Type‑C standard and which have been designed and
built according to the requirements of that standard, the requirements of that Type‑C standard take
precedence.
This International Standard has been prepared to give guidance to machinery designers and writers of
product safety standards on how to design and select interlocking devices associated with guards.
Relevant clauses of this International Standard, used alone or in conjunction with provisions from
other standards, may be used as a basis for verification procedures for the suitability of a device for
interlocking duties.
The informative Annexes A to F describe the technology and the typical characteristics of the defined
interlocking devices types 1 to 4. Other solutions may be adopted, provided that they comply with
the principles of this standard. The informative Annexes G to I give information on particular aspects
like interlocking devices used within safety functions, risk assessment considering the motivation to
defeat and static action forces. The informative Annex J describes a holding force test and an impact
resistance test for guard locking devices. Normative Annex K provides information on the masking of
faults in series connection of interlocking devices. Normative Annex L provides requirements for type 5
interlocking systems (trapped key interlocking systems) and describes their technology.
vi © ISO 2021 – All rights reserved

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oSIST prEN ISO 14119:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 14119:2021(E)
Safety of machinery — Interlocking devices associated
with guards — Principles for design and selection
1 Scope
This International Standard specifies principles for the design and selection — independent of the nature
of the energy source — of interlocking devices associated with guards and provides guidance of measures
to minimize the possibility of defeat of interlocking devices in a reasonably foreseeable manner.
This International Standard covers the parts of guards which actuate interlocking devices and
principles for the design, selection and application of trapped key interlocking devices and systems for
machinery applications, independent of the type of energy used to control them or that they control
NOTE ISO 14120 specifies general requirements for the design and construction of guards provided
primarily to protect persons from mechanical hazards. The processing of the signal from the interlocking device
to stop the machine and prevent unexpected start up is dealt with in ISO 13849‑1 or IEC 62061:2015.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13906-1, Cylindrical helical springs made from round wire and bar — Calculation and design — Part 1:
Compression springs
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design
ISO 13849-2:2012, Safety of machinery — Safety-related parts of control systems — Part 2: Validation
IEC 60204-1:2016, modified, Safety of machinery — Electrical equipment of machines — Part 1: General
requirements
IEC 60947-5-1:2016, + COR: 2016, Low voltage switchgear and controlgear — Part 5‑1: Control circuit
devices and switching elements — Electromechanical control circuit devices
IEC 60947-5-3:2013, Low‑voltage switchgear and controlgear — Part 5‑3: Control circuit devices
and switching elements — Requirements for proximity devices with defined behaviour under fault
conditions (PDDB)
IEC 62061:2015, Safety of machinery — Functional safety of safety‑related electrical, electronic and
programmable electronic control systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100, ISO 13849‑1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
© ISO 2021 – All rights reserved 1

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— IEC Electropedia: available at http:// www .electropedia .org/
3.1
interlocking device
interlock
mechanical, electrical or other type of device, the purpose of which is to prevent the operation of
hazardous machine functions under specified conditions (generally as long as a guard is not closed)
Note 1 to entry: See Figure 1 and Table 1.
[SOURCE: ISO 12100:2010, 3.28.1]
Key
1 guard 4 position switch
2 interlocking device 5 actuating system
3 actuator 6 output system
a
Direction of opening
Figure 1 — Example of an interlocking device
3.2
interlocking guard
guard associated with an interlocking device so that, together with the control system of the machine,
the following functions are performed:
— the hazardous machine functions associated with the guard cannot operate until the guard is closed;
— if the guard is opened while hazardous machine functions are operating, a stop command is given;
— when the guard is closed, the hazardous machine functions associated with by the guard can
operate. The closure of the guard does not by itself start the hazardous machine functions.
Note 1 to entry: An interlocking guard can contain/be equipped with one or more interlocking devices. These
interlocking devices can also be of different types.
[SOURCE: ISO 12100:2010, 3.27.4]
2 © ISO 2021 – All rights reserved

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3.3
interlocking guard with a start function
control guard
special form of an interlocking guard which, once it has reached its closed position, gives a command to
initiate the hazardous machine function(s) without the use of a separate start control
Note 1 to entry: ISO 12100:2010, 6.3.3.2.5 gives detailed provisions regarding the condition of use.
[SOURCE: ISO 12100:2010, 3.27.6]
3.4
guard locking device
device intended to lock a guard in the closed position and linked to the control system
3.5
interlocking guard with locking function
guard associated with an interlocking device and a guard locking device so that, together with the
control system of the machine, the following functions are performed:
— the hazardous machine functions associated with the guard cannot operate until the guard is closed
and locked;
— the guard remains closed and locked until the risk due to the hazardous machine functions associated
with the guard has ceased, and
— when the guard is closed and locked, the hazardous machine functions associated with the guard
can operate (the closure and locking of the guard do not by themselves start the hazardous machine
functions)
[SOURCE: ISO 12100:2010, 3.27.5]
3.6
safety–related part of a control system
SRP/CS
part of a control system that performs a safety function, starting from safety‑related input(s) to
generate
...

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