Electrical installation
49
Connection to an IT (ungrounded) power system
WARNING! Before connecting the drive to an IT power system [an ungrounded
power system or a high resistance-grounded (over 30 ohms) power system] or a
corner-grounded power system, the internal EMC filtering of the drive must be
disconnected.
If a drive with its internal EMC filtering connected is installed on an IT system or a
corner-grounded system, the drive system will be connected to earth potential
through the EMC filter capacitors of the drive. This may cause danger or damage the
unit.
Disconnection of internal EMC filtering
1. Place the drive module on its back on a level surface.
2. Release the two screws holding the JCU control unit.
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