Checking the insulation of the assembly
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) systems
The RFI filter is not suitable for use in IT (ungrounded) systems. Disconnect the filter before
connecting the drive to the supply network. For instructions on how to do this, contact your
local ABB representative.
WARNING!
If a drive with an RFI filter is installed on an IT system (an ungrounded power
system), the system will be connected to earth potential through the filter capacitors
of the drive. This can cause danger, or damage the unit.
Electrical installation 103
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