46 R6…R9 Quick installation guide
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.
Check from the table below if you have to disconnect the EMC filter (EMC) or ground-
to-phase varistor (VAR). For instructions on how to do this, see page 47.
Frame
sizes
EMC
filter
(EMC)
Ground-
to-phase
varistor
(VAR)
Symmetrically
grounded TN
systems
(TN-S systems)
1
Corner grounded
TN systems
2
IT systems
(ungrounded or
high-resistance
grounded
[>30 ohms])
3
R6…R9 EMC
(2 screws)
-
Do not disconnect
Disconnect Disconnect
-VAR
(1 screw)
Do not disconnect Do not disconnect
Disconnect
1 2 3
Drive
PE
N
L3
L2
L1
Drive Drive
PE
L3
L2
L1
L3
L2
L1
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