AS/NZS 3947.5.4:2000

1 - AS/NZS 3947.5.4:2000 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - CONTROL CIRCUIT DEVICES AND SWITCHING ELEMENTS-METHODS OF ....
4 - PREFACE
6 - CONTENTS
8 - INTRODUCTION
9 - 1 General
9 - 1.1 Scope and object
9 - 1.2 Normative references
10 - 2 Definitions and lists of symbols used
10 - 2.1 Definitions
10 - 2.1.1 reliability:
10 - 2.1.2 contact reliability:
11 - 2.1.3 failure:
11 - 2.1.4 defect:
11 - 2.1.5 observed failure rate
11 - 2.1.6 assessed failure rate
11 - 2.1.7 constant failure rate period:
11 - 2.1.8 entity; item:
11 - 2.1.9 controlling unit:
11 - 2.1.10 steady state (of the contacts after closing):
11 - 2.1.11 load:
11 - 2.1.12 duty ratio:
12 - 2.1.13 contact voltage drop:
12 - 2.1.14 defect contact voltage drop :
12 - 2.1.15 defect time:
12 - 2.1.16 ON voltage:
12 - 2.1.17 ON time :
12 - 2.1.18 OFF voltage :
12 - 2.1.19 OFF time :
12 - 2.2 List of symbols used
13 - 3 General principles
13 - 4 General test method
14 - 5 General characteristics
14 - 5.1 Measurement methods
14 - 5.1.1 Measurement on the contact (basic method)
15 - 5.1.2 Monitoring the load (alternative method)
16 - 5.2 Sequences of operations
17 - 5.3 Electrical characteristics
17 - 5.3.1 Characteristics of the supply for basic method
18 - 5.3.2 Supply for alternative method
18 - 5.3.3 Characteristics of active load
18 - 5.4 Characteristics of operation
19 - 6 Characterization of defects
19 - 6.1 For the basic method
19 - 6.1.1 Calibration of the detection threshold
19 - 6.1.2 Monitoring (during tm)
19 - 6.2 Monitoring the load (figure 3)
19 - 6.2.1 Voltage drop measurement
19 - 6.2.2 Analysis of the state of the load
19 - 7 Ambient conditions
19 - 7.1 Normal conditions
19 - 7.1.1 Preconditioning
20 - 7.2 Particular conditions
20 - 8 Methods of reporting
20 - 8.1 Failure criterion
20 - 8.2 Reporting the failure rate
20 - 8.2.1 Estimation of ...when failed items are not replaced
21 - 8.2.2 Estimation of ...when failed items are replaced
22 - 9 Information to be provided in the test report
24 - Annex A - Information to be supplied by the manufacturer

Applies to separable contacts used above (and including)10V (typically 24V) where contacts are used for switching loads with possible electrical erosion, such as programmable controller inputs or below 10V (typically 5V) with negligible electrical erosion, such as electronic circuits. Does not apply to contacts used in identical with and reproduced from IEC 60947-5-4;1996.

First published as AS/NZS 3947.5.4:2000.