EN – R0…R4 Quick installation guide 25
Switch off the power and open the cover
See figure B1 on page 165.
2. Switch off the power from the drive.
3. Remove the front cover: Loosen the retaining screw with a screwdriver (3a) and
lift the cover from the bottom outwards (3b) and then up (3c).
Check the compatibility with IT (ungrounded) and corner-
grounded TN systems
EMC filter
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. Check the table on page 26.
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.
Ground-to-phase varistor
The ground-to-phase varistor is not suitable for use on an IT (ungrounded) system.
Disconnect the ground-to-phase varistor before connecting the drive to the supply
network. Check the table on page 26.
WARNING! Do not install the drive with the ground-to-phase varistor connected
on an IT system (an ungrounded power system or a high-resistance-grounded
[over 30 ohms] power system), otherwise the varistor circuit can be damaged.
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