ABB ACS580-07 - Guidelines for Installing the Drive to a TT System

IT systems (ungrounded or
high-resistance grounded [>30
ohms]) (C)
Corner-grounded (B1) and
midpoint-grounded delta (B2)
systems
Symmetrically grounded TN
systems (TN-S systems), ie.
center-grounded wye (A)
Frame
size
Drive Drive
PE
L3
L2
L1
L3
L2
L1
Drive
PE
L3
L2
L1
B1 C
B2
PE
L2
L3
L1
N
Drive
A
These are the EMC filter and varistor screws in different drive frame sizes.
Ground-to-phase varistor screwsEMC filter (+E200) screwsFrame
size
VARTwo EMC screwsR6..R9
Guidelines for installing the drive to a TT system
The drive can be connected to a TT system under these conditions:
1. Residual current device has been installed in the supply system.
2. This wire has been disconnected. Otherwise EMC filter and ground-to-phase varistor
capacitor leakage current will cause the residual current device to trip.
Ground-to-phase varistor screwsEMC filter screwsFrame
size
VARTwo EMC screwsR6...R9
VAR-R10, R11
92 Electrical installation