ABB ACS580-07 - Checking the Insulation of the Drive System; Checking the Insulation of the Input Cable; Checking the Compatibility with IT (Ungrounded), Corner-Grounded Delta, Midpoint-Grounded Delta, and TT Systems; Ground-To-Phase Varistor

￭ Checking the insulation of the drive system
WARNING!
Do not make any voltage withstand or insulation resistance tests on any part of
the drive as testing can damage the drive. Every drive has been tested for insulation
between the main circuit and the chassis at the factory. Also, there are
voltage-limiting circuits inside the drive which cut down the testing voltage
automatically.
￭ Checking the insulation of the input cable
Before you connect the input power cable to the drive, check its insulation according to local
regulations.
￭ Checking the compatibility with IT (ungrounded), corner-grounded
delta, midpoint-grounded delta, and TT systems
Ground-to-phase varistor
A drive with the ground-to-phase varistor connected can be installed to a symmetrically
grounded TN-S system. If you install the drive to another system, you may need to disconnect
the varistor.
WARNING!
Do not install the drive with the ground-to-phase varistor connected to a system
that the varistor is not suitable for. If you do, the varistor circuit can be damaged.
When to disconnect the ground-to-phase varistor: TN-S, IT, corner-grounded delta
and midpoint-grounded delta systems
IT systems (ungrounded or
high-resistance grounded [>30
ohms]) (C)
Corner-grounded (B1) and
midpoint-grounded delta (B2)
systems
Symmetrically grounded TN
systems (TN-S systems), ie.
center-grounded wye (A)
Frame
size
Disconnect EMC screws (2 pcs)
and VAR screw.
Do not disconnect EMC AC or
VAR screws. Disconnect EMC
DC screw.
Do not disconnect EMC or VAR
screws.
R6...R9
Disconnect VAR wire.Do not disconnect VAR wire.Do not disconnect VAR wire.R10...
R11
Electrical installation 91
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