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1st Ed, Rev B 07/31/2019
SR44 Series Soft Starter User Manual
Chapter 4: Electromagnetic Compatibility
4.5 – EMC Basic Criteria
The electromagnetic compatibility of a product is defined by two criteria:
1) Immunity to electromagnetic disturbances generated externally to the product.
2) The type and amount of conducted and radiated electromagnetic emissions emanating from the
product.
Ascertaining the nature of the power supply is of primary consideration when deciding on
appropriate EMC requirements. The requirements for equipment installed in heavy industrial
environments (fed from their own isolated low voltage power supply) differ from those installed in
residential, commercial, light industrial, and health-care applications (directly connected to a
public low-voltage network).
Generally, industrial installations require higher immunity levels and permit higher levels of
conducted and radiated emissions than those for non-industrial installations. On the other hand,
lower levels of emissions output, and lower immunity levels, are specified for installations
connected directly to the public low-voltage network.
4.6 – Purchasing Implications of Meeting an EMC Standard
Before purchasing components for the installation, the specifier must evaluate the expected source
of power for the Soft Starter and understand exactly the implications for meeting EMC
requirements. It is likely that failure to do so will result in the purchase and installation of
inappropriate equipment. Close consultation with your supplier will avoid these unnecessary
problems, particularly when you do not understand, or are unclear about any part of the guidelines
given later in this section. If you have any doubt, please ask.
IMPORTANT: The information and guidance given in section 4.7 forms part of the statutory requirements
of the European Union Directive 89/336/EEC on EMC.
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