It (Ungrounded) Systems - ABB ACS800-U4 Hardware Manual

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IT (ungrounded) systems

Ensure that the drive is not equipped with optional EMC filter, i.e. type code does not
include selections +E200 or +E202.
However if EMC filters exist, disconnect the EMC filter capacitors of selections
+E202 and +E200 before connecting the drive to an ungrounded system. For
detailed instructions on how to do this, please contact your local ABB distributor.
WARNING! If a drive with EMC filter selection +E202 or +E200 is installed on an IT
system [an ungrounded power system or a high resistance-grounded (over 30 ohms)
power system], the system will be connected to earth potential through the EMC
filter capacitors of the drive. This may cause danger or damage the unit.
Electrical installation
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