AS/NZS IEC 60947.4.2:2015 pdf download – Low-voltage switchgear and controlgear Part 4.2: Contactors and motor- starters—AC semiconductor motor controllers and starters.
1 Scope This standard applies to a.c. semiconductor motor controllers and starters, which may include a series mechanical switching device, intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. This standard 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 2.2.1 3 of IEC 60947-1 :2007) controlling non-motor loads; – electronic a.c. power controllers covered by IEC 601 46 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 a.c. semiconductor motor controllers and starters and associated equipment; – the conditions with which a.c. 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. NOTE For the purpose of this standard, the term “controller” may be used instead of “a.c. semiconductor motor controller”.
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 :201 0, 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 6041 0:1 973, 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 switchgear and controlgear – Part 1: General rules IEC 61 000-4 (all parts), Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques CISPR 1 1 :2009, Industrial, scientific and medical equipment – Radio-frequency disturbance characteristics – Limits and methods of measurement Amendment 1 (201 0)
3.3 Terms and definitions concerning a.c. semiconductor motor controllers and starters 3.3.1 semiconductor switching device switching device designed to make and/or break the current in an electric circuit by means of the controlled conductivity of a semiconductor NOTE This definition differs from IEC 60050-441 :1 984, 441 -1 4-03 since a semiconductor switching device is also designed for breaking the current. [IEC 60947-1 :2007, 2.2.3] 3.3.2 a.c. semiconductor motor controller semiconductor switching device that provides the starting function for an a.c. motor and an OFF-state NOTE 1 Because dangerous levels of leakage currents can exist in a semiconductor motor controller in the OFF- state, the load terminals should be considered as live parts at all times. NOTE 2 In a circuit where the current passes through zero (alternately or otherwise), the effect of “not making” the current following such a zero value is equivalent to breaking the current. 3.3.3 semiconductor motor controller (form 1) a.c. semiconductor motor controller, in which the starting function may comprise any starting method specified by the manufacturer, and that provides control functions which may include any combination of manoeuvring, controlled acceleration, running or controlled deceleration of an a.c. motor. A FULL-ON state may also be provided NOTE See Figure 1 and Table 1 .