ABB ACS580-01 - Ground-To-Phase Varistor

92 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 on page 92.
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 sections Frames
R1…R3 on page 93 or Frames R4…R9 on page 94.
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
R1…R3 EMC
(1 screw)
- Do not disconnect Disconnect Disconnect
-VAR
(1 screw)
Do not disconnect Disconnect Disconnect
R4…R5 EMC
(2 screws)
- Do not disconnect Frames R4 and
R5 cannot be
used in corner
grounded TN
systems.
Disconnect
-VAR
(1 screw)
Do not disconnect Disconnect
R
6 …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