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

28 EN - Quick installation and start-up guide
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.
EN
Do not install the drive with the internal EMC filter connected on a corner-grounded
TN system, otherwise the drive will be damaged.
HI
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)
-
Ground-to-phase varistor (page
Ground- to- Symmetrically
phase varis- grounded TN
tor systems (TN-S
systems) 1
(VAR)
- Do not disconnect
VAR (1 Do not disconnect
screw)
28).
Corner groun- IT systems (un-
ded TN systems grounded or
2
high-resistance
grounded [>30
ohms]) 3
Disconnect Disconnect
Do not disconnect Disconnect