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

1000 V DC,
ohm
> 1 Mohm
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. See section EMC compatibility and motor cable length (page
￭

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 sections
or Frames R4...R8 (page
Ground-to-phase varistor (page
65).
Electrical installation 63
R+
R-
PE
63).
120).
Frames R0...R3 (page 64)