Ground-To-Phase Varistor - ABB ACH580 Series Installation, Operation And Maintenance Manual

18

Ground-to-phase varistor

The ground-to-phase varistor is not suitable for use on an IT (ungrounded) system.
Disconnect the ground-to-phase varistor by removing the metal screw before
connecting the drive to the supply network. See the table on page 18. The VAR
screw location is labeled on the drive.
Check the table below to determine which screws may be metal for your system.
Frame
R1...R3
R4...R5
R6...R9
1) EMC and VAR columns show the screw material when the drive is shipped.
2) R4 and R5 frames were evaluated for use on corner grounded networks by UL standards. R4 and R5
3)
Note:The VAR screw on R1...R3 also connects the EMC (AC) circuit internally within the VFD.
Note:Failure to remove a metal screw, when indicated in the table above, may result in VFD failure.
Note: For statements containing "Maintain plastic screw.": Metal screw must not be
used, plastic screw may be maintained or removed from the AC EMC circuit.
ACH580-01 Installation
Factory
Screw default
sizes label screw
material
EMC (DC) Plastic
VAR Metal
EMC (AC) Plastic
EMC (DC) Plastic
VAR Metal
EMC (AC) Plastic
EMC (DC) Plastic
VAR Metal
frames are not to be used on IEC installations of corner grounded networks.
L1
L2
L3
N
PE
Drive
ACH580 Installation, Operation and Maintenance Manual
Configure the ACH580 EMC Filter based on the electrical
system of the installation
Symmetrically
grounded TN
Corner grounded
systems (e.g.
1)
TN systems
Center-
3)
grounded-wye)
Can install metal Maintain the plastic
screw screw
Maintain the metal Remove the metal
screw screw
Can install metal Maintain the plastic
screw screw
Can install metal Maintain the plastic
screw screw
Maintain the metal Maintain the metal
screw screw
Can install metal Maintain the plastic
screw screw
Can install metal Maintain the plastic
screw screw
Maintain the metal Maintain the metal
screw screw
4)
L1
L2
L3
PE
Drive
IT systems
(ungrounded or
high-resistance
4)
grounded [>30
ohms])
Maintain the plastic
screw.
Remove the metal
screw
Maintain the plastic
2)
screw
Maintain the plastic
screw
Remove the metal
2)
screw
Maintain the plastic
screw
Maintain the plastic
screw
Remove the metal
screw
5)
Drive
5)
L1
L2
L3