ABB ACS480 - Disconnecting the EMC Filter or Ground-To-Phase Varistor

WARNING!
Remove the metal VAR screw in IT systems. If you do not, it can cause danger or
damage to the drive.
Earthing systems and the need to remove EMC screw or VAR screwScrew materialScrew 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)
RemoveRemoveDo not removeMetalEMC
RemoveDo not removeDo not removeFrames R1, R3, R4:
Metal
VAR
Do not removeDo not removeDo not removeFrame 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
￭ Disconnecting the EMC filter or ground-to-phase varistor
Before you proceed, see When to disconnect EMC filter or ground-to-phase
varistor (page 53). Obey the guidelines.
1. Stop the drive and disconnect it from the power line.
2. Wait 5 minutes to let the intermediate circuit capacitors discharge.
3. To disconnect the EMC filter, remove the metal EMC screw.
4. To disconnect the varistor, remove the metal VAR screw.
54 Electrical installation – IEC