Ground-To-Phase Varistor - ABB ACS560 Hardware Manual

86 Electrical installation
￭

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).
Frame EMC filter
sizes (EMC)
R0...R3 EMC (1
screw)
-
R4...R5 EMC (2
screws)
-
R6...R8 EMC (2
screws)
-
1
Drive
Ground- to- Symmetrically
phase varis- grounded TN
tor systems (TN-S
systems) 1
(VAR)
- Do not discon-
nect
VAR (1 Do not discon-
screw) nect
- Do not discon-
nect
VAR (1 Do not discon-
screw) nect
- Do not discon-
nect
VAR(1 screw) Do not discon-
nect
2
L1
L2
L3
N
PE
Corner groun-
ded TN systems
2
Disconnect
Do not discon-
nect
Frames R4 and
R5 cannot be
used in corner
grounded TN
systems.
Disconnect
Do not discon-
nect
3
L1
L2
L3
PE
Drive
IT systems (un-
grounded or
high-resistance
grounded [>30
ohms]) 3
Disconnect
Disconnect
Disconnect
Disconnect
Disconnect
Disconnect
L1
L2
L3
Drive