{"id":239335,"date":"2024-10-19T15:39:11","date_gmt":"2024-10-19T15:39:11","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-61810-22017\/"},"modified":"2024-10-25T10:21:18","modified_gmt":"2024-10-25T10:21:18","slug":"bs-en-61810-22017","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-61810-22017\/","title":{"rendered":"BS EN 61810-2:2017"},"content":{"rendered":"

This part of IEC 61810<\/span> <\/span> covers test conditions and provisions for the evaluation of endurance tests using appropriate statistical methods to obtain reliability characteristics for relays.<\/p>\n

This document applies to electromechanical elementary relays considered as non-repaired items (i.e. items which are not repaired after failure).<\/p>\n

The lifetime of a relay is usually expressed in number of cycles (CTF). Therefore, whenever the terms \u201ctime\u201d or \u201cduration\u201d are used in IEC 61649<\/span> <\/span>, they carry the meaning \u201ccycles\u201d. However, with a given frequency of operation, the number of cycles can be transformed into respective times (e.g. times to failure (TTF)).<\/p>\n

The failure criteria and the resulting characteristics of elementary relays describing their reliability in normal use are specified in this document. A relay failure occurs when the specified failure criteria are met.<\/p>\n

As the failure rate for elementary relays cannot be considered as constant, particularly due to wear-out mechanisms, the cycles to failure of tested items typically show a Weibull distribution. This document provides numerical and graphical methods to calculate approximate values for the two-parameter Weibull distribution, as well as lower confidence limits and a method for confirmation of reliability values with the WeiBayes method.<\/p>\n

This document does not cover procedures for electromechanical elementary relays where enhanced requirements for the verification of reliability apply.<\/p>\n

\n
\n NOTE 1\n <\/div>\n

Such reliability test procedures are specified in IEC 61810\u20112\u20111<\/span> <\/span>. In particular, when electromechanical elementary relays are intended to be incorporated in safety-related control systems of machinery in accordance with IEC 62061<\/span> <\/span> and ISO 13849\u20111<\/span> <\/span>, IEC 61810\u20112\u20111<\/span> <\/span> defines procedures for the manufacturer to provide B<\/i> 10D<\/sub> values.<\/p>\n<\/div>\n

\n
\n NOTE 2\n <\/div>\n

Electromechanical elementary relays with forcibly guided (mechanically linked) contacts according to IEC 61810\u20113<\/span> <\/span> offer the possibility of a high diagnostic coverage according to 4.5.3 of ISO 13849\u20111:2015<\/span> <\/span>.<\/p>\n<\/div>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nNational foreword <\/td>\n<\/tr>\n
7<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
9<\/td>\nFOREWORD <\/td>\n<\/tr>\n
11<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
12<\/td>\n1 Scope
2 Normative references
3 Terms and definitions <\/td>\n<\/tr>\n
15<\/td>\n3.21 Terms and definitions related to tests
4 General considerations <\/td>\n<\/tr>\n
16<\/td>\n5 Test conditions
5.1 Sample items <\/td>\n<\/tr>\n
17<\/td>\n5.2 Environmental conditions
5.3 Operating conditions <\/td>\n<\/tr>\n
18<\/td>\n5.4 Test equipment
6 Failure criteria
7 Output data
8 Analysis of output data
9 Presentation of reliability measures <\/td>\n<\/tr>\n
20<\/td>\nAnnex A (normative) Data analysis
A.1 General
A.2 Abbreviations
A.3 Symbols and definitions <\/td>\n<\/tr>\n
21<\/td>\nA.4 Weibull distribution <\/td>\n<\/tr>\n
22<\/td>\nA.5 Procedure
A.5.1 Graphical methods <\/td>\n<\/tr>\n
23<\/td>\nFigures
Figure A.1 \u2013 An example of Weibull probability paper <\/td>\n<\/tr>\n
25<\/td>\nFigure A.2 \u2013 An example of cumulative hazard plotting paper
Figure A.3 \u2013 Plotting of data points and drawing of a straight line <\/td>\n<\/tr>\n
26<\/td>\nFigure A.4 \u2013 Estimation of distribution parameters <\/td>\n<\/tr>\n
27<\/td>\nA.5.2 Numerical methods <\/td>\n<\/tr>\n
28<\/td>\nA.5.3 Confidence Intervals <\/td>\n<\/tr>\n
30<\/td>\nA.5.4 WeiBayes Approach <\/td>\n<\/tr>\n
31<\/td>\nTables
Table A.1 \u2013 Confidence levels for WeiBayes without failures <\/td>\n<\/tr>\n
33<\/td>\nAnnex B (informative) Example of data analysis
B.1 Graphical methods case study (cumulative hazard plot)
B.1.1 General
B.1.2 Procedure of cumulative hazard plot
Table B.1 \u2013 Worksheet for cumulative hazard analysis <\/td>\n<\/tr>\n
35<\/td>\nB.1.3 Example applied to life test data
Figure B.1 \u2013 Estimation of distribution parameters <\/td>\n<\/tr>\n
36<\/td>\nTable B.2 \u2013 Example worksheet <\/td>\n<\/tr>\n
37<\/td>\nFigure B.2 \u2013 Cumulative hazard plots <\/td>\n<\/tr>\n
38<\/td>\nB.2 Numerical methods case study (Weibull probability)
B.2.1 General
B.2.2 Distribution parameters
B.2.3 Mean cycles to failure (MCTF)
Table B.3 \u2013 First twenty failures in this example <\/td>\n<\/tr>\n
39<\/td>\nB.2.4 Value of B10
B.2.5 Mean time to failure (MTTF)
B.3 Confidence intervals case study
B.3.1 General
B.3.2 Interval estimation of \u03b2 <\/td>\n<\/tr>\n
40<\/td>\nB.3.3 Interval estimation of \u03b7
B.3.4 Lower confidence limit for B10 <\/td>\n<\/tr>\n
41<\/td>\nB.3.5 Lower confidence limit for R
B.4 WeiBayes case study <\/td>\n<\/tr>\n
42<\/td>\nFigure B.3 \u2013 Type test versus WeiBayes analysed periodic test <\/td>\n<\/tr>\n
43<\/td>\nAnnex C (informative) Statistical tables
C.1 Table of gamma function
C.2 Fractiles of the normal distribution
Table C.1 \u2013 Values of the gamma function <\/td>\n<\/tr>\n
44<\/td>\nTable C.2 \u2013 Fractiles of the normal distribution <\/td>\n<\/tr>\n
45<\/td>\nAnnex D (informative) Success run \u2013 Test without failures
D.1 General
D.2 Confidence level and minimum reliability <\/td>\n<\/tr>\n
46<\/td>\nD.3 Example
Table D.1 \u2013 Number of samples and life cycles <\/td>\n<\/tr>\n
47<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Electromechanical elementary relays – Reliability<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2017<\/td>\n48<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":239337,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[512,2641],"product_tag":[],"class_list":{"0":"post-239335","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-120-70","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/239335","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/239337"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=239335"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=239335"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=239335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}