ABB ACS480 - Page 72

WARNING!
Failure to remove the metal VAR screw, when indicated in the table, can cause
danger or drive failure.
WARNING!
Do not install the metal EMC screw in systems other than the symmetrically
grounded TN-S system. It can cause danger, or damage to the drive.
Earthing systems and factory default EMC or VAR screwFactory
default screw mater-
ial
Screw la-
bel
IT systems (ungroun-
ded or high-resistance
grounded) (C)
Corner-grounded
delta (B1), midpoint-
grounded delta (B2)
and TT (D) systems
Symmetrically groun-
ded TN-S systems, i.e,
center grounded-
wye (A)
Maintain the plastic
screw.
Maintain the plastic
screw.
Can install the metal
screw.
1)
PlasticEMC
Remove the metal
screw.
Maintain the metal
screw.
Maintain the metal
screw.
Frames R1, R3, R4:
metal
VAR
Maintain the plastic
screw.
Maintain the plastic
screw.
Maintain the plastic
screw.
Frame R2: plastic
Drive
PE
N
L3
L2
L1
Drive Drive
PE
L3
L2
L1
L3
L2
L1
Drive
PE
L3
L2
L1
B1 CA
B2
PE
L2
L3
L1
N
Drive
A
Drive
N
L3
L2
L1
D
1)
If you are concerned with EMC issues, you can install the metal screw and connect the EMC filter. The metal screw is
included in the drive delivery.
72 Electrical installation – North America