ABB ACH180-04S - When to Disconnect the EMC Filter

￭
When to disconnect the EMC filter
The table shows different earthing systems, and when you need to disconnect the
EMC filter (metal EMC screw).
WARNING!
Remove the metal EMC screw in systems other than the symmetrically
grounded TN-S systems. If you do not, it can cause danger or damage to the
drive.
When to remove EMC screw or VAR screwScrew materialScrew
label
IT systems (un-
grounded or high-
resistance groun-
ded) (C)
Corner-grounded
delta (B1), mid-
point- grounded
delta (B2) and TT
(D) systems
Symmetrically
grounded TN-S sys-
tems, i.e, center-
grounded wye (A)
RemoveRemoveDo not removeMetalEMC
Do not removeDo not remove
Do not remove
1)
Plastic
RemoveDo not removeDo not removeMetalVAR
Do not removeDo not removeDo not removePlastic
A B1
B2A
C
D
L1
L2
L3
N
PE
L1
L2
L3
PE
L1
L2
L3
L1
L2
L3
N
PE
L1
L2
L3
PE
L1
L2
L3
N
1)
Can install the metal screw included in the drive delivery to connect the internal EMC filter.
Note: Frame R1 does not currently support corner-grounded delta (B1) system.
64 Electrical installation