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 EMC compatibility and motor cable length (page 125).
￭ 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 below.
WARNING! 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).
IT systems (un-
grounded or high-
resistance groun-
ded [>30 ohms])
3
Corner grounded
TN systems
2
Symmetrically
grounded TN sys-
tems (TN-S sys-
tems)
1
Ground- to-
phase varistor
(VAR)
EMC filter
(EMC)
Frame
sizes
DisconnectDisconnectDo not disconnect-EMC (1 screw)R0…R3
DisconnectDo not disconnectDo not disconnectVAR (1 screw)-
DisconnectFrames R4 and R5
cannot be used in
corner grounded TN
systems.
Do not disconnect-EMC (2
screws)
R4…R5
DisconnectDo not disconnectVAR (1 screw)-
DisconnectDisconnectDo not disconnect-EMC (2
screws)
R6…R8
DisconnectDo not disconnectDo not disconnectVAR(1 screw)-
Drive
PE
N
L3
L2
L1
Drive Drive
PE
L3
L2
L1
L3
L2
L1
￭ Frames R0…R3
To disconnect the internal EMC filter or ground-to-phase varistor, if needed, do as follows:
1. Switch off the power from the drive.
Electrical installation 67
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