ABB ACS580 Series - When to Connect EMC Filter or Disconnect Ground-To-Phase Varistor: TN-S, IT, Corner-Grounded Delta and Midpoint-Grounded Delta Systems

￭
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.
IT systems (un-
grounded or high-
resistance groun-
ded [>30 ohms])
(C)
Corner-grounded
(B1) and midpoint-
grounded delta
systems (B2)
≤ 600 V
Symmetrically
grounded TN sys-
tems (TN-S sys-
tems) ie. center-
grounded wye (A)
Factory
default
screw
material
Screw
label
Frame
size
None or plastic
2)
None or plastic
2)
Optional metal
screw
1)
None or
plastic
EMC (DC)R1…R3
R4 v2
Remove the metal
screw
None or plasticDo not disconnect
the metal screw
MetalVAR
None or plastic
2)
None or plastic
2)
Optional metal
screw
1)
None or
plastic
EMC (AC)
R4…R9
3)
None or plastic
2)
None or plastic
2)
Optional metal
screw
1)
None or
plastic
EMC (DC)
Remove the metal
screw
Do not disconnect
the metal screw
Do not disconnect
the metal screw
MetalVAR
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)
Install metal screw and connect the EMC filter for better noise filtering.
Electrical installation – North America 177