1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationElectromechanical elementary relaysPart 2-1: Reliability Procedure for the verification of B10 valuesBS EN 61810-2-1:2011National forewordThis British Standard is the UK implemen
2、tation of EN 61810-2-1:2011. It is identical to IEC 61810-2-1:2011.The UK participation in its preparation was entrusted to Technical Committee EPL/94, General purpose relays and reed contact units.A list of organizations represented on this committee can be obtained on request to its secretary.This
3、 publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 73984 2 ICS 29.120.70Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published und
4、er the authority of the Standards Policy and Strategy Committee on 30 June 2011.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61810-2-1:2011EUROPEAN STANDARD EN 61810-2-1 NORME EUROPENNE EUROPISCHE NORM April 2011 CENELEC European Committee for Electrotechnical
5、Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61810-2-1
6、:2011 E ICS 29.120.70 English version Electromechanical elementary relays - Part 2-1: Reliability - Procedure for the verification of B10 values (IEC 61810-2-1:2011) Relais lectromcaniques lmentaires - Partie 2-1: Fiabilit - Procdure de vrification des valeurs de B10 (CEI 61810-2-1:2011) Elektromech
7、anische Elementarrelais - Teil 2-1: Funktionsfhigkeit (Zuverlssigkeit) - Verfahren zum Nachweis der B10-Werte (IEC 61810-2-1:2011) This European Standard was approved by CENELEC on 2011-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condition
8、s 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 Central Secretariat or to any CENELEC member. This European Standard exists in three
9、official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical
10、committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerlan
11、d and the United Kingdom. BS EN 61810-2-1:2011EN 61810-2-1:2011 - 2 - Foreword The text of document 94/317/FDIS, future edition 1 of IEC 61810-2-1, prepared by IEC TC 94, All-or-nothing electrical relays, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61810-2-1 on 2
12、011-04-01. This standard is to be used in conjunction with EN 61810-2:2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following
13、 dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-04-01 Annex ZA has been added
14、 by CENELEC. _ Endorsement notice The text of the International Standard IEC 61810-2-1:2011 was approved by CENELEC as a European Standard without any modification. _ BS EN 61810-2-1:2011- 3 - EN 61810-2-1:2011 Annex ZA (normative) Normative references to international publications with their corres
15、ponding European publications 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. NOTE When an intern
16、ational publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 61810-1 2008 Electromechanical elementary relays - Part 1: General requirements EN 61810-1 2008 IEC 61810-2 2011 Electromechanical elementary relays -
17、Part 2: Reliability EN 61810-2 2011 IEC 62061 2005 Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems EN 62061 + corr. February 2005 2010 ISO 13849-1 2006 Safety of machinery - Safety-related parts of control systems - Part 1:
18、 General principles for design EN ISO 13849-1 2008 BS EN 61810-2-1:2011 2 61810-2-1 IEC:2011 CONTENTS INTRODUCTION . 5 1 Scope . . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Verification of B107 4.1 General . 7 4.2 Requirements . 7 4.2.1 Test specimens 7 4.2.2 Test circuit 7 4.2.3 Co
19、ntact loads . 7 4.2.4 Environmental conditions 7 4.2.5 Operating conditions 8 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 B10d9 5.1 General . 9 5.2 Requirements . . 10 5.2.1 Test specimens . 10 5.2.2 Tes
20、t circuit . 10 5.2.3 Contact loads . 10 5.2.4 Environmental conditions 10 5.2.5 Operating conditions 10 5.2.6 Failure criteria 10 5.3 Performance of the tests . 11 5.3.1 Conformity test . 11 5.3.2 Periodic test . 11 Annex A (informative) Example illustrating the assessment of malfunctions for B10dev
21、aluation 15 Bibliography . 17 Figure 1 Schematic flowchart 13 Figure 2 Schematic flowchart for relays where dangerous failures have to be assessed . 14 Table A.1 Example with number of cycles at which malfunctions have been recorded . . 15 BS EN 61810-2-1:201161810-2-1 IEC:2011 5 INTRODUCTION Based
22、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 is passed and then confirmed by periodic tests with specified period
23、icity. This standard describes how figures for B10(the mean number of cycles until 10 % 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 c
24、ontrol 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 “da
25、ngerous” 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 MTTFdthen becomes the expectation of the mean time to failure in th
26、is “dangerous“ mode. For the calculation of MTTFdfor electromechanical relays the data provided by the manufacturer for B10dcan be used (see C.4 of ISO 13849-1:2006). Electromechanical elementary relays with forcibly guided (mechanically linked) contacts offer the possibility of a high diagnostic co
27、verage according to 4.5.3 of ISO 13849-1:2006. NOTE Requirements for such relays are given in EN 50205. BS EN 61810-2-1:2011 6 61810-2-1 IEC:2011 ELECTROMECHANICAL ELEMENTARY RELAYS Part 2-1: Reliability Procedure for the verification of B10values 1 Scope This part of IEC 61810 specifies reliability
28、 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 B10value
29、s for dangerous failures (B10dvalues) are derived from the tests specified in this standard. This International 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
30、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 requirements IEC 61810-2:2011, Electromechanical elementary relays Part 2:
31、 Reliability IEC 62061:2005, Safety of machinery Functional safety of safety-related electrical, electronic and programmable electronic control systems ISO 13849-1:2006, Safety of machinery Safety-related parts of control systems Part 1: General principles for design 3 Terms and definitions For the
32、purposes of this document, the terms and definitions given in the IEC 61810-2, as well as the following 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 ISO 13849-1:2006, 3.1.5, modified 3.2 confo
33、rmity 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 of relays drawn from running production BS EN 61810-2-1:201161810-2-1 IEC:2011 7 NOTE The results from periodic
34、tests are used to verify that the level of technical performance is maintained. 4 Verification of B104.1 General This clause specifies requirements where the reliability of the relay has to be assessed and verified. This procedure is applicable to relays where wearout mechanisms prevail. NOTE 1 For
35、relays where random failures prevail, provisions are under consideration. NOTE 2 For relays intended to be used in safety-related control systems of machinery, the provisions of Clause 5 are applicable. The following failure modes can occur: failure to open of a relay contact; failure to close of a
36、relay contact; unintended bridging of a changeover contact; insulation failure of the relay. From a conformity test, a value for B10is obtained that indicates the probability of the occurrence of a relay failure. The value for B10is given in numbers of cycles. NOTE 3 With the knowledge of the freque
37、ncy of operation (cycling rate) of the relay within a specific application the number of cycles can be transformed into respective times. Verification that this B10value is applicable to relays from the series production shall be carried out by periodic tests. An overview of this procedure is given
38、in Figure 1. 4.2 Requirements 4.2.1 Test specimens The test shall be carried out with 10 relays in accordance with IEC 61810-2. 4.2.2 Test circuit The test circuit described in Annex C of IEC 61810-1:2008 shall be used, unless otherwise specified by the manufacturer and explicitly indicated in the t
39、est report. When feasible, one of the circuits in accordance with Annex D of IEC 61810-1:2008 is to be used. 4.2.3 Contact loads The contact loads shall be specified by the manufacturer and indicated in the test report. It is recommended to select appropriate resistive loads according to 5.7 of IEC
40、61810-1:2008 or inductive loads according to Annex B of IEC 61810-1:2008. 4.2.4 Environmental conditions The conditions of Table 1 of IEC 61810-1:2008 apply. However, an extended ambient temperature range of 18 C to 40 C is permitted. BS EN 61810-2-1:2011 8 61810-2-1 IEC:2011 4.2.5 Operating conditi
41、ons The provisions of 5.3 of IEC 61810-2:2011 apply. Unless otherwise specified by the manufacturer, each cycle of the coil energization shall be 1 s ON and 9 s OFF. The test is performed without coil suppression, unless explicitly specified. 4.2.6 Failure criteria Generally the test is to be contin
42、ued until all test specimens have failed. When the test is truncated at a specific number of cycles, all relays that have not yet failed are considered to fail at that number of cycles (worst case assumption). However, at least 7 of the tested relays shall fail physically. For the assessment of reco
43、rded malfunctions severity B according to Clause 6 of IEC 61810-2:2011 applies. The dielectric test is performed: between coil and contacts; between adjacent contacts; across open contacts. NOTE A contact that fails to open cannot be tested for compliance with the requirements for open contacts. The
44、 verification of insulation requirements according to Clause 11 of IEC 61810-1:2008 (with 75 % of the initial voltage for the dielectric test specified under 10.3 of IEC 61810-1:2008) may be performed in either of the following ways: a) during the test, the dielectric test is performed periodically
45、at given numbers of cycles. When the relay does not pass the dielectric test, the number of cycles for the previous dielectric test that has been passed is considered as the cycles to failure value for this individual relay; b) in the case that no periodical monitoring according to item a) is perfor
46、med, the dielectric test shall be made when a relay under test fails due to a functional contact failure (see 4.1). If the relay does not comply with the dielectric test, the whole test is not passed. The same applies when the test is truncated at a certain number of cycles. 4.3 Performance of the t
47、ests 4.3.1 Conformity test The conformity test is carried out with a sample of 10 relays. Each failure shall be recorded. The B10value is evaluated based on the procedure given in IEC 61810-2. After completion of a conformity test, the first periodic test shall be initiated for verification in accor
48、dance with the periodicity specified under 4.3.2. 4.3.2 Periodic test The periodic test shall be performed in regular intervals as specified by the manufacturer. For each periodic test, the evaluated B10value shall be at least 80 % of the B10value obtained from the conformity test. NOTE This require
49、ment is intended to take into account possible variations for the periodic tests. BS EN 61810-2-1:201161810-2-1 IEC:2011 9 In case these requirements are not met, suitable corrective actions have to be taken to remove the failure causes. The complete conformity test shall be repeated with appropriately modified test specimens or adapted contact loads (e.g. reduced switching current). 5 Evaluation and verification of B10d5.1 General This clause specifies requireme
