AS NZS IEC 60947.4.2:2015 pdf free download – Low-voltage switchgear and controlgear Part 4.2: Contactors and motor- starters—AC semiconductor motor controllers and starters.
5 Characteristics of a.c. semiconductor motor controllers and starters
5.1 Summary of characteristics
The characteristics of controllers and starters shall be stated in the following terms, where such terms are applicable:
– type of equipment (5.2);
– rated and limiting values for main circuits (5.3);
– utilization category (5.4);
– control circuits (5.5);
– auxiliary circuits (5.6);
– types and characteristics of relays and releases (5.7);
– co-ordination with short-circuit protective devices (5.8).
5.2 Type of equipment
The following shall be stated:
5.2.1 Form of equipment
Forms of controllers and starters (see 3.3 and 3.4).
5.2.2 Number of poles
– Number of main poles
– Number of main poles where the operation is controlled by a semiconductor switching
element
5.2.3 Kind of current
AC only.
5.2.4 Interrupting medium (air, vacuum, etc.)
Applicable only to mechanical switching devices of hybrid controllers and starters.
5.2.5 Operating conditions of the equipment
5.2.5.1 Method of operation
For example:
– symmetrically controlled controller (such as a semiconductor with fully controlled phases);
– non-symmetrically controlled controller (such as thyristors and diodes).
5.2.5.2 Method of control
For example:
– automatic (by pilot switch or sequence control);
– non-automatic (that is push-buttons);
– semi-automatic (that is partly automatic, partly non-automatic).
5.2.5.3 Method of connecting
For example (see Figure 2):
– motor in delta, thyristors in series with a winding;
– motor in star, thyristors in delta;
– motor in delta, thyristors connected between winding and supply.
5.3 Rated and limiting values for main circuits
The rated and limiting values established for controllers and starters shall be stated in accordance with 5.3.1 to 5.3.6, but it may not be necessary to establish all applicable values by tests.
5.3.1 Rated voltages
A controller or starter is defined by the following rated voltages.
5.3.1 .1 Rated operational voltage (U e )
Subclause 4.3.1 .1 of IEC 60947-1 :2007 applies with the following addition.
The rating of a.c. equipment shall include the number of phases except that the rating of equipment obviously intended for single-phase use only is not required to include the number of phases.
5.3.1 .2 Rated insulation voltage (U i )
Subclause 4.3.1 .2 of
IEC 60947-1 :2007 applies.
5.3.1 .3 Rated impulse withstand voltage (U imp )
Subclause 4.3.1 .3 of IEC 60947-1 :2007 applies.AS NZS IEC 60947.4.2 pdf download.