When To Connect Emc Filter Or Disconnect Ground-To-Phase Varistor: Tn-S, It, Corner-Grounded Delta And Midpoint-Grounded Delta Systems - ABB ACS580 Series Hardware Manual

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When to connect EMC filter or disconnect ground-to-phase varistor:
TN-S, IT, corner-grounded delta and midpoint-grounded delta systems
Requirements for disconnecting EMC filter and varistor and additional requirements
for different electrical power systems are given below.
Note: Configure the EMC filter based on the electrical system of the installation
site.
Frame Screw Factory
size label
material
R1...R3 EMC (DC) None or
R4 v2
VAR
3) EMC (AC) None or
R4...R9
EMC (DC) None or
VAR
A
1) Install metal screw and connect the EMC filter for better noise filtering.
Symmetrically
default grounded TN sys-
screw tems (TN-S sys-
tems) ie. center-
grounded wye (A)
Optional metal
plastic 1)
screw
Metal Do not disconnect
the metal screw
Optional metal
1)
plastic
screw
Optional metal
plastic 1)
screw
Metal Do not disconnect
the metal screw
L1
L2
L3
N
PE
Drive
Electrical installation – North America 177
Corner-grounded
(B1) and midpoint-
grounded delta
systems (B2)
≤ 600 V
None or plastic
None or plastic
None or plastic
None or plastic
Do not disconnect
the metal screw
B1
L1
L2
L3
PE
Drive
B2
L1
L2
L3
PE
Drive
IT systems (un-
grounded or high-
resistance groun-
ded [>30 ohms])
(C)
2) 2)
None or plastic
Remove the metal
screw
2) 2)
None or plastic
2) 2)
None or plastic
Remove the metal
screw
C
L1
L2
L3
Drive