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18
ACH580 Installation, Operation and Maintenance Manual
ACH580-01 Installation
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
. The VAR
screw location is labeled on the drive.
Check the table below to determine which screws may be metal for your system.
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.
Frame
sizes
Screw
label
Factory
default
screw
material
1)
Configure the ACH580 EMC Filter based on the electrical
system of the installation
Symmetrically
grounded TN
systems (e.g.
Center-
grounded-wye)
3)
Corner grounded
TN systems
4)
IT systems
(ungrounded or
high-resistance
grounded [>30
ohms])
5)
R1…R3
EMC (DC) Plastic
Can install metal
screw
Maintain the plastic
screw
Maintain the plastic
screw.
VAR
Metal
Maintain the metal
screw
Remove the metal
screw
Remove the metal
screw
R4…R5
EMC (AC)
Plastic
Can install metal
screw
Maintain the plastic
screw
2)
Maintain the plastic
screw
EMC (DC) Plastic
Can install metal
screw
Maintain the plastic
screw
Maintain the plastic
screw
VAR
Metal
Maintain the metal
screw
Maintain the metal
screw
2)
Remove the metal
screw
R6…R9
EMC (AC)
Plastic
Can install metal
screw
Maintain the plastic
screw
Maintain the plastic
screw
EMC (DC) Plastic
Can install metal
screw
Maintain the plastic
screw
Maintain the plastic
screw
VAR
Metal
Maintain the metal
screw
Maintain the metal
screw
Remove the metal
screw
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
frames are not to be used on IEC installations of corner grounded networks.
3)
4)
5)
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.
L1
L2
L3
N
PE
Drive
L1
L2
L3
PE
Drive
L1
L2
L3
Drive