09-30197676-DC.pdf

a Date: 15 January 2009 Origin: International Latest date for receipt of comments: 15 March 2009 Project no.: 2008/01376 Responsible committee: EPL/94 General purpose relays and reed contact units Interested committees: Title: BS IEC 61810-2-1 Ed.1: Electromechanical elementary relays Part 2-1: Reliability - Procedure for the verification of B10 values Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 15 March 2009. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. 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Direct tel: 020 8996 7009 Responsible Committee Secretary: Committee Service Centre (BSI) E-mail: cscbsigroup.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 09/30197676 DC Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:56, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on international discussions in which the UK has taken an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent standard. There is a high probability that this text could be adopted by CENELEC as a reference document for harmonization or as a European Standard. Recipients of this draft are requested to comment on the text bearing in mind this possibility. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. 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Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:56, Uncontrolled Copy, (c) BSI FORM CD (IEC) 2002-08-08 94/282/CD COMMITTEE DRAFT (CD) IEC/TC or SC: TC 94 Project number IEC 61810-2-1 Ed.1 Title of TC/SC: All-or-nothing electrical relays Date of circulation 2009-01-09 Closing date for comments 2009-04-10 Also of interest to the following committees TC 44, SC 17B Supersedes document 94/273/NP - 94/275/RVN Functions concerned: Safety EMC Environment Quality assurance Secretary: Guido von Trentini (Germany) THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT SHOULD NOT BE USED FOR REFERENCE PURPOSES. RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. Title: IEC 61810-2-1 Ed.1: Electromechanical elementary relays - Part 2-1: Reliability - Procedure for the verification of B10 values (Titre) : Introductory note Copyright © 2009 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions. You may not copy or “mirror“ the file or printed version of the document, or any part of it, for any other purpose without permission in writing from IEC. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:56, Uncontrolled Copy, (c) BSI IEC 61810-2-1 © IEC:200X 2 94/282/CD CONTENTS FOREWORD.3 Introduction.5 1 Scope.6 2 Normative references .6 3 Terms and definitions .6 4 Verification of B10.7 4.1 General.7 4.2 Requirements7 4.2.1 Test specimens .7 4.2.2 Test circuit 7 4.2.3 Contact loads 7 4.2.4 Environmental conditions.7 4.2.5 Operating conditions7 4.2.6 Failure criteria .8 4.3 Performance of the tests .8 4.3.1 Conformity test 8 4.3.2 Periodic test 8 5 Evaluation and verification of B10d.8 5.1 General.8 5.2 Requirements9 5.2.1 Test specimens .9 5.2.2 Test circuit 9 5.2.3 Contact loads 9 5.2.4 Environmental conditions.10 5.2.5 Operating conditions10 5.2.6 Failure criteria .10 5.3 Performance of the tests .10 5.3.1 Conformity test 10 5.3.2 Periodic test 11 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:56, Uncontrolled Copy, (c) BSI IEC 61810-2-1 © IEC:200X 3 94/282/CD INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROMECHANICAL ELEMENTARY RELAYS Part 2-1: Reliability Procedure for the verification of B10 values FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. IEC 61810-2-1 has been prepared by IEC Technical Committee 94: All-or-nothing electrical relays. This standard cancels and replaces IEC/PAS 61810-2-1 published in 2008-07. The text of this standard is based on the following documents: FDIS Report on voting 94/XX/FDIS 94/XX/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:56, Uncontrolled Copy, (c) BSI IEC 61810-2-1 © IEC:200X 4 94/282/CD The committee has decided that the contents of this publication will remain unchanged until the maintenance result date1 indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. 1 The National Committees are requested to note that for this publication the maintenance result date is 2013. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:56, Uncontrolled Copy, (c) BSI IEC 61810-2-1 © IEC:200X 5 94/282/CD Introduction Based on the general provisions of IEC 61810-2 this standard specifies reliability test procedures for electromechanical elementary relays where enhanced requirements for the verification of reliability apply. An initial conformity test has to be passed and then confirmed by periodic tests at least once a year. This standard describes how figures for B10 (the mean number of cycles until 10 percent of the relays have failed) are derived from these life tests performed with representative relay samples. In particular when electromechanical elementary relays are intended to be incorporated in safety-related control systems of machinery in accordance with IEC 62061 and ISO 13849-1, the mean time to dangerous failure (MTTFd) is a measure that can be taken into account when assessing the probability of dangerous failure of the safety function concerned. Although a component failure cannot be defined as “dangerous” unless the detailed application is known, it is common to consider a failure mode that is likely to result in danger in a typical application of the component, and to refer to this failure mode as a “dangerous failure”. The MTTFd then becomes the expectation of the mean time to failure in this “dangerous“ mode. For the calculation of MTTFd for electromechanical relays the data provided by the manufacturer for B10d can be used (see C.4 of ISO 13849-1). Electromechanical elementary relays with forcibly guided (mechanically linked) contacts offer the possibility of a high diagnostic coverage (DC) according to 4.5.3 of ISO 13849-1. NOTE Requirements for such relays are given in EN 50205. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:56, Uncontrolled Copy, (c) BSI IEC 61810-2-1 © IEC:200X 6 94/282/CD ELECTROMECHANICAL ELEMENTARY RELAYS Part 2-1: Reliability Procedure for the verification of B10 values 1 Scope This standard specifies reliability test procedures for electromechanical elementary relays when enhanced requirements for the verification of reliability apply. Particular provisions are given for relays incorporated in safety-related control systems of machinery in accordance with IEC 62061 and ISO 13849-1. For such relays B10 values for dangerous failures (B10d values) are derived from the tests specified in this standard. This standard is only intended to be used in conjunction with IEC 61810-2. 2 Normative references The following referenced documents are indispensable for the application 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. IEC 61810-1 (2008): Electromechanical elementary relays Part 1: General and safety requirements IEC 61810-2 (200X): Electromechanical elementary relays Part 2: Reliability IEC 62061 (2005): Safety of machinery Functional safety of safety-related electrical, electronic and programmable electronic control systems ISO 13849-1: Safety of machinery Safety-related parts of machinery Part 1: General principles for design 3 Terms and definitions The terms and definitions of IEC 61810-2 apply. 3.1 dangerous failure failure which has the potential to put the safety-related part of a control system in a hazardous or fail-to-function state 3.1.5 of ISO 13849-1 3.2 conformity test test of a sample of relays made to a given design to verify that these relays comply with the specified requirements 3.3 periodic test test carried out periodically on a sample o