Checking The Compatibility With It (Ungrounded) And Corner-Grounded Tn Systems; Emc Filter; Ground-To-Phase Varistor - ABB ACS560 Quick Installation And Start-Up Manual

Checking the compatibility with IT (ungrounded) and
corner-grounded TN systems
￭

EMC filter

The internal EMC filter is not suitable for use on an IT (ungrounded) system or on a
corner-grounded TN system. Disconnect the EMC filter before connecting the drive to the
supply network. Check the table in
WARNING!
Do not install the drive with the internal EMC filter connected on an IT system (an
ungrounded power system or a high-resistance-grounded [over 30 ohms] power
system), otherwise the system will be connected to ground potential through the
EMC filter capacitors of the drive. This can cause danger, or damage the drive.
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. For more information, see section Technical data in the hardware
manual.
￭

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!
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 hardware manual.
Frame EMC filter
sizes
(EMC)
R0...R3 EMC (1 screw) -
- VAR (1 screw)
R4...R5 EMC (2 -
screws)
- VAR (1 screw)
R6...R8 EMC (2 -
screws)
- VAR(1 screw)
Ground-to-phase varistor (page
Ground- to- Symmetrically
phase varistor grounded TN sys-
tems (TN-S sys-
(VAR)
1
tems)
Do not disconnect
Do not disconnect
Do not disconnect
Do not disconnect
Do not disconnect
Do not disconnect
EN - Quick installation and start-up guide 29
29).
Corner grounded
2
TN systems
Disconnect Disconnect
Do not disconnect Disconnect
Frames R4 and R5 Disconnect
cannot be used in
corner grounded TN
Disconnect
systems.
Disconnect Disconnect
Do not disconnect Disconnect
EN
HI
IT systems (un-
grounded or high-
resistance groun-
3
ded [>30 ohms])