Electrical installation 47
Checking the compatibility with IT (ungrounded) and
corner grounded TN systems
WARNING! Disconnect the internal EMC filter when installing the drive on an
IT system (an ungrounded power system or a high resistance-grounded [over
30 ohms] power system), otherwise the system will be connected to ground potential
through the EMC filter capacitors. This may cause danger or damage the drive.
Disconnect the internal EMC filter when installing the drive on a corner-grounded TN
system, otherwise the drive will be damaged.
Note: When the internal EMC filter is disconnected, the drive is not EMC compatible
without an external filter.
1. If you have an IT (ungrounded) or corner grounded TN system, disconnect the
internal EMC filter by removing the EMC screw. For 3-phase U-type drives (with
type designation ACS320-03U-), the EMC screw is already removed at the factory
and replaced by a plastic one.
Pay attention to the screws! Do not confuse the EMC screw to the similar varistor
disconnecting screw. Do not disconnect the varistor. The varistor protects the
drive against power line voltage peaks.
Note: In frame size R4
the EMC screw is located
to the right of terminal W2.
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