ABB ACH580-01 - 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
systems (B2)
≤ 600 V
Symmetrically groun-
ded 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
1)
Frames R4 and R5 are not evaluated for use on corner-grounded systems or midpoint-grounded delta systems
by IEC standards.
Note: These are the EMC filter and varistor screws of different drive frame sizes.
Ground-to-phase varistor screwsEMC filter screwsFrame size
VAREMC screwR1…R3
R4 v2
VARTwo EMC screwsR4…R5
VARTwo EMC screwsR6…R9
￭ Guidelines for installing the drive to a TT system
The drive can be installed to a TT system under these conditions:
1. Residual current device has been installed in the supply system.
2. These screws have been disconnected. Otherwise EMC filter and ground-to-phase
varistor capacitor leakage current will cause the residual current device to trip.
Electrical installation – IEC 117