IEC 60947-4-2-2020 pdf free download – Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – Semiconductor motor controllers, starters and soft-starters
This part of lEC 60947 applies to semiconductor motor controllers,starters and soft-starterswhich can include a series mechanical switching device, intended to be connected to circuitsthe rated voltage of which does not exceed 1 000 vAC.
This document characterizes semiconductor motor controllers and starters with and withoutbypass means.
This document does not apply to:
– semiconductor motor controllers and starters used for continuous operation of AC motors
at motor speeds other than the normal speed1;
electromechanical contactors and external overload relays (see lEC 60947-4-1);
short-circuit protective device associated with semiconductor motor controllers andstarters (see iEc 60947-4-1(MPSD),IEC 60947-2 and lEC 60947-3);
semiconductorequipment, includingsemiconductor contactors (3.4.13 oflEC 60947-1:2020) controlling non-motor loads (see lEC 60947-4-3);
– semiconductor motor controllers and starters used for rotor circuits1;- adjustable speed electrical power drive systems (see lEC 61800 series);- use of the product within explosive atmospheres (see lEC 60079 series);software and firmware requirements 1;
NOTE 1 Guidance on embedded software is given in lEC TR 63201.- cyber security aspects (see lEC TS 63208).
Contactors，overload relays and control circuit devices used in semiconductor motorcontrollers and starters are considered compliant with the requirements of their relevantproduct standard.Where mechanical switching devices are used, they are considered meetingthe requirements of their own lEC product standard,and the additional requirements of thisdocument.
The object of this document is to state as follows:
– the characteristics of semiconductor motor controllers，starters and soft-starters and
associated equipment;
the conditions with which semiconductor motor controllers，starters and soft-starterscomply with reference to
a) their operation and behaviour in normal and abnormal operating conditions includingovercurrent operating conditions;
b) their dielectric properties;
c) the degrees of protection provided by their enclosures where applicable;
d) their construction including safety measures against electric shock， fire hazard and
mechanical hazard;
the tests intended for confirming that these conditions have been met, and the methods tobe adopted for these tests;
– the information to be given with the equipment, or in the manufacturer’s literature.
NOTE 2 For the purpose of this document,the term “controller”is used instead of “semiconductor motorcontroller”.
2Normative references
The following documents are referred to in the text in such a way that some or all of theircontent constitutes requirements of this document.For dated references,only the editioncited applies. For undated references, the latest edition of the referenced document (includingany amendments) applies.
IEC 60034-1:2017，Rotating electrical machines – Part 1: Rating and performance
IEC 60445,Basic and safety principles for man-machine interface,marking and identification- ldentification of equipment terminals,conductor terminations and conductors
IEC 60715,Dimensions of low-voltage switchgear and controlgear – Standardized mountingon rails for mechanical support of switchgear,controlgear and accessories
IEC 60730-1,Automatic electrical controls – Part 1: General requirements
IEC 60947-1:2020,Low-voltage switchgear and controlgear – Part 1: General rules
IEC 61000-3-2，Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmoniccurrent emissions (equipment input current s16 A per phase)
IEC 61000-3-3,Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltagechanges, voltage fluctuations and flicker in public low-voltage supply systems, for equipmentwith rated current s16 A per phase and not subject to conditional connection
IEC 61000-3-11，Electromagnetic compatibility (EMC) – Part 3-11:Limits – Limitation ofvoltage changes,voltage fluctuations and flicker in public low-voltage supply systems -Equipment with rated current s 75 A and subject to conditional connection
IEC 61000-3-12,Electromagnetic compatibility (EMC) – Part 3-12: Limits – Limits forharmonic currents produced by equipment connected to public low-voltage systems with inputcurrent >16 A and s 75 A per phase
IEC 61140:2016，Protection against electric shock – Common aspects for installation andequipment
CISPR 11:2015,Industrial，scientific and medical equipment – Radio-frequency disturbancecharacteristics – Limits and methods of measurement.IEC 60947-4-2 pdf download.