This part of IEC 60947 applies to separable contacts used in the utilization area considered, such as switching elements for control circuits.<\/p>\n
This standard takes into consideration two typical rated voltage areas:<\/p>\n
above (and including) 10 V (typically 24 V) where contacts are used for switching loads with possible electrical erosion, such as programmable controller inputs;<\/p>\n<\/li>\n
below 10 V (typically 5 V) with negligible electrical erosion, such as electronic circuits.<\/p>\n<\/li>\n<\/ol>\n
This standard does not apply to contacts used in:<\/p>\n
functional safety area. In case of contacts used in functional safety area, Annex N of IEC 60947-5-1:2016 applies;<\/p>\n<\/li>\n
very low energy area of measurement, for example, sensor or thermocouple systems.<\/p>\n<\/li>\n<\/ul>\n
The object of this standard is to propose a method of assessing the performances of low energy contacts giving<\/p>\n
useful definitions;<\/p>\n<\/li>\n
general principles of test methods which are to monitor and record the behaviour of contacts at each operation;<\/p>\n<\/li>\n
functional bases for the definition of a general testing equipment;<\/p>\n<\/li>\n
preferred test values;<\/p>\n<\/li>\n
particular conditions for testing contacts intended for specific applications (such as switching of PC inputs);<\/p>\n<\/li>\n
information to be given in the test report;<\/p>\n<\/li>\n
interpretation and presentation of the rest results.<\/p>\n<\/li>\n<\/ul>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 1 Scope and object 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3 Definitions and list of symbols used 3.1 Definitions <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 3.2 List of symbols used 4 General principles <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5 General test method <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 6 General characteristics 6.1 Measurement methods Figure 1 \u2013 Functional diagram of the testing equipment <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Figure 2 \u2013 Typical test circuit for the basic method <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6.2 Sequences of operations Figure 3 \u2013 Test circuit for monitoring a load <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 4 \u2013 Sequential diagram with load-switching contacts <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 6.3 Electrical characteristics Figure 5 \u2013 Sequential diagram without load-switching contacts <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 6.4 Characteristics of operation <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 7 Characterization of defects 7.1 Basic method 7.2 Monitoring the load (figure 3) 8 Ambient conditions 8.1 Normal conditions 8.2 Preconditioning <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 8.3 Particular conditions 9 Methods of reporting 9.1 Failure criterion 9.2 Reporting the failure rate <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 10 Information to be provided in the test report <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Table 1 \u2013 Coefficient Kc for a time-terminated test <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Annex\u00a0A (normative) Information to be supplied by the manufacturer <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Low-voltage switchgear and controlgear – Control circuit devices and switching elements. Method of assessing the performance of low-energy contacts. Special tests<\/b><\/p>\n |