Electrical installation 129
Checking the insulation of the assembly
WARNING! Repeat the steps described in section Electrical safety
precautions on page 128. The complete safety instructions are given in
Safety instructions for ACS880 multidrive cabinets and modules
(3AUA0000102301 [English]). If you ignore them, physical injury or death, or damage to
the equipment can occur.
ACS880-04
Do not make any voltage tolerance or insulation resistance tests on ACS880-04. Every
supply and inverter module has been insulation tested between the main circuit and the
chassis at the factory. Also, there may be voltage-limiting circuits inside the modules which
cut down the testing voltage automatically.
Power cables
Check the insulation of the supply (input) and motor (output) cable according to local
regulations before connecting it to the drive.
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.
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