2 Engineering
2.4 EMC compliance
36 DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com
With their high interference immunity up to category C3, DC1 variable
frequency drives are ideal for use in harsh industrial networks (2nd environ-
ment).
The DC1…-F… version (with integrated RFI filter) makes it possible to
comply with the stringent limit values for conducted emission for category
C1 in the 1st environment. This requires a correct EMC installation
( Page 51) and the observance of the permissible motor cable lengths and
the maximum switching frequency (f
PWM
) of the inverter.
In the case of variable frequency drives without an internal radio interference
suppression filter, longer motor cable lengths and lower leakage currents can
sometimes be achieved for the individual categories by using a dedicated
external radio interference suppression filter.
The required EMC measures should be taken into account in the engineering
phase. Improvements and modifications during mounting and installation or
even at the installation site involve additional and even considerably higher
costs.
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