112
agility
TM
Series Soft Start User Manual
MAN-AGY-001. Version 04. 21/09/2018
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.
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.
IMPORTANT: The information and guidance given in section C.7 forms part of the
statutory requirements of the European Union Directive 2004/108/EC on EMC
Basic EMC Considerations
Immunity
The product standard for immunity requirements is EN 60947-4-2:2012. All agility
TM
Soft Starter
products meet, or exceed the industrial level immunity requirements laid down in this standard.
Emissions
Emissions are classified as low frequency (below 9kHz), known as harmonics, and high or radio
frequency (above 9kHz). Both radio-frequency emissions and low-frequency harmonics are
generated by the action of the agility
TM
Soft-Starter.
NOTICE: This product has been designed for environment A. Use of this product in
environment B may cause unwanted electromagnetic disturbances in which case the user
may be required to take adequate mitigating measures.
Emissions - Harmonics
During normal operation, soft starters turn their semiconductor switches on and off in order to
vary the voltage at the motor terminals, and this introduces supply discontinuities and generates
harmonics. However, the mode of pulsing used by agility
TM
Soft Starters minimizes these
harmonic effects, since agility
TM
power circuits are configured as a fully-controlled regulators
(W3C).
EMC (continued)