Page C–2 Stellar
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SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
Appendix C: Electromagnetic Compatibility
c.0 – elecTRomAGNeTIc compATIbIlITy (emc)
As supplied, all SR55 Soft Starters meet the standards of emission and immunity levels
defined in the IEC 60947-4-2 and EN 60947-4-2 product standards for AC Semiconductor Motor
Controllers and Starters. However, the EMC performance of the controller can be significantly
affected by the manner in which it is incorporated into the system in which it is intended to
operate. To prevent inadvertent degradation of EMC performance, attention must be given to
motor cable lengths, wiring configurations, the nature of the power supply, etc., at the design,
construction and implementation stages of a project.
c.1 – INTRoducTIoN
It is widely accepted that electromagnetic compatibility between electronic and electrical
products is a desirable objective. Technical standards are increasingly stipulating levels
of EMC performance which compliant products are required to meet. The decision by the
European Union (EU) to implement a community-wide directive covering EMC caused
considerable activity among electrical and electronic equipment manufacturers and suppliers
to identify, understand, and mitigate the sources of electromagnetic interference within their
products and systems.
c.2 – ApplIcAble sTANdARd WIThIN The eu
The product standard which defines EMC performance for soft starters is IEC 60947-4-2
‘AC Semiconductor Motor Controllers and Starters.’ (The Official Journal of the EC will list
this standard as EN 60947-4-2.) The SR55 has been type tested in accordance with the test
procedures and levels laid down in the product standard.
c.3 – mANdAToRy RequIRemeNTs WIThIN The eu
(Applicable to any person involved in the installation and operation of the equipment.)
The EU Directive 2004/108/EC, describes the required EMC performance of all electrical
equipment which is to be connected to a low voltage supply network. It imposes an obligation
on the manufacturer of the soft starter to provide sufficient information for installers, system
integrators, users, and anyone else connected with the installation and operation of the
equipment. This section provides the technical information to support the obligation of the
manufacturer.
The provision and maintenance of compatibility extends from the manufacturer to the panel
builder, assembler, systems integrator, and ultimately to the installer and user. Anyone
involved in the installation and operation of the equipment, through a lack of knowledge,
misdirection, or for other reasons, can completely negate the initial EMC performance of the
equipment.
c.4 – GuIdANce foR INsTAllATIoN peRsoNNel ANd sysTem desIGNeRs
For safety reasons, all SR55 products are intended to be installed and set to work by skilled
personnel who are capable of interpreting and following EMC guidelines correctly. Any person
not fully trained in the appropriate technology should not attempt the installation.
If you do not understand, or if you are unclear about any part of these guidelines, then please
consult your supplier. Often, consultation with the supplier can avoid unnecessary problems
in specifying and installing the correct combination of equipment.
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