ABB ACS560 - Ground-To-Phase Varistor

￭
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
grounded [>30
ohms])
3
Corner groun-
ded TN systems
2
Symmetrically
grounded TN
systems (TN-S
systems)
1
Ground- to-
phase varis-
tor
(VAR)
EMC filter
(EMC)
Frame
sizes
DisconnectDisconnectDo not discon-
nect
-EMC (1
screw)
R0…R3
DisconnectDo not discon-
nect
Do not discon-
nect
VAR (1
screw)
-
DisconnectFrames R4 and
R5 cannot be
used in corner
grounded TN
systems.
Do not discon-
nect
-EMC (2
screws)
R4…R5
DisconnectDo not discon-
nect
VAR (1
screw)
-
DisconnectDisconnectDo not discon-
nect
-EMC (2
screws)
R6…R8
DisconnectDo not discon-
nect
Do not discon-
nect
VAR(1 screw)-
1 2 3
Drive
PE
N
L3
L2
L1
Drive Drive
PE
L3
L2
L1
L3
L2
L1
86 Electrical installation