76 Electrical installation
Checking the compatibility with IT (ungrounded) and
corner-grounded TN systems
The internal EMC filter is not suitable for use on an IT (ungrounded) system or on a
corner-grounded TN system. Disconnect the EMC filter before connecting the drive to
the supply network. For instructions on how to do this, see page 76.
WARNING! Do not install the drive with the internal EMC filter connected 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 of the drive. This can cause danger, or damage the
drive.
Do not install the drive with the internal EMC filter connected on a corner-grounded
TN system, otherwise the drive will be damaged.
Note: When the internal EMC filter is disconnected, the drive EMC compatibility is
considerably reduced. See section Compliance with the European EMC Directive on
page 134.
Disconnecting the internal EMC filter – all frame sizes
To disconnect the internal varistors and EMC filter (option +E200), in an IT
(ungrounded) or corner-grounded TN system, do as follows:
1. Switch off the power from the drive.
2. Remove the following screws:
• VAR (frames R1 and R2, located close to the supply terminals)
• EMC, VAR1 and VAR2 (frames R3 and R4, located on the front of the power
unit).
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