ABB ACH580-31 Series Hardware Manual page 88

84 Electrical installation – IEC
IT systems (ungrounded or high-resistance grounded [>30 ohms])
TT systems
Note 1: Frames R3 and R6 are evaluated for use on corner-grounded systems and
midpoint-grounded delta systems by UL standards. They are not evaluated by IEC
standards for use on corner-grounded or midpoint-grounded systems.
Note 2: These are the EMC filter and varistor screws of different drive frame sizes.
IEC
Frame
size
R3
R6
R8
*)
VAR screw functions also as EMC AC screw in frame R8.
R3: Disconnect EMC and VAR screws.
L1
R6: Disconnect EMC AC, EMC DC and VAR screws.
L2
R8: Disconnect EMC DC and VAR screws.
L3
R3: Disconnect EMC and VAR screws.
L1
R6: Disconnect EMC AC, EMC DC and VAR screws.
L2
R8: Disconnect EMC DC and VAR screws.
L3
Residual current device has to be installed in the supply
N
system.
Note:
• Because the EMC filter screws have been disconnected,
ABB does not guarantee the EMC category.
• ABB does not guarantee the functioning of the ground
leakage detector built inside the drive.
• In large systems the residual current device can trip without
a real reason.
EMC filter crews
EMC
EMC AC, EMC DC
EMC DC
Ground-to-phase varistor screws
VAR
VAR
VAR*