IEC 60947-4-2-2011 pdf free download.Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – AC semiconductor motor controllers and starters.
IEC 60947-4-2 characterizes a.c. semiconductor motor controllers and starters with and without bypass means.
AC semiconductor motor controllers and starters dealt with in this standard are not normally designed to interrupt short-circuit currents. Therefore, suitable short-circuit protection (see 8.2.5) should form part of the installation, but not necessarily of the a.c. semiconductor motor controller or starter.
In this context, this standard gives requirements for a.c. semiconductor motor controllers and starters associated with separate short-circuit protective devices.
This standard does not apply to
— continuous operation of a.c. motors at motor speeds other than the normal speed;
— semiconductor equipment, including semiconductor contactors (see 2.2.13 of IEC 60947-1 :2007) controlling non-motor loads;
— electronic a.c. power controllers covered by IEC 60146 series.
Contactors, overload relays and control circuit devices used in a.c. semiconductor motor controllers and starters should comply with the requirements of their relevant product standard. Where mechanical switching devices are used, they should meet the requirements of their own IEC product standard, and the additional requirements of this standard.
The object of this standard is to state as follows:
— the characteristics of ac. semiconductor motor controllers and starters and associated equipment:
— the conditions with which ac. semiconductor motor controllers and starters comply with reference to
a) their operation and behaviour;
b) their dielectric properties;
C) the degrees of protection provided by their enclosures where applicable;
d) their construction;
— the tests intended for confirming that these conditions have been met, and the methods to be adopted for these tests;
— the information to be given with the equipment, or in the manufacturer’s literature.
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 60034-1 :20 10. Rotating electrical machines — Part 1: Rating and performance IEC 60085:2007, Electrical insulation — Thermal evaluation and designation
IEC 60269-1:2006, Low-voltage fuses — Part 1: General requirements Amendment 1 (2009)
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems
IEC 60947-1:2007, Low-voltage switch gear and controlgear — Part 1: General rules
IEC 61000-4 (all parts), Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques
CISPR 11:2009. Industrial, scientific and medical equipment — Radio-frequency disturbance characteristics — Limits and methods of measurement
Amendment 1 (2010)
3 Terms, definitions, symbols and abbreviations
3.1 General
For the purposes of this document, the terms and definitions of Clause 2 of IEC 60947- 1:2007, as well as the following terms, definitions, symbol and abbreviations apply.IEC 60947-4-2 pdf free download.