Electrical installation
76
Before installation
Checking the insulation of the assembly
Every drive has been tested for insulation between the main circuit and the chassis
(2500 V rms 50 Hz for 1 second) at the factory. Therefore, do not make any voltage
tolerance or insulation resistance tests (e.g. hi-pot or megger) on any part of the
drive. When checking the insulation of the assembly, proceed in the following
manner:
WARNING! Check the insulation before connecting the drive to the supply. Make
sure that the drive is disconnected from the supply (input power).
1. Check that all motor cables are disconnected from the drive output terminals.
2. Measure the insulation resistances of the motor cable and the motor between
each phase and the Protective Earth by using a measuring voltage of 1 kV DC.
The insulation resistance must be higher than 1 Mohm.
IT (ungrounded) systems
EMC filter +E202 is not suitable for use in an IT (ungrounded) system. If the drive is
equipped with EMC filter +E202, disconnect the filter before connecting the drive to
the supply network. For detailed instructions on how to do this, please contact your
local ABB representative.
WARNING! If a drive with EMC filter +E202 is installed on an IT system [an
ungrounded power system or a high resistance-grounded (over 30 ohms) power
system], the system will be connected to earth potential through the EMC filter
capacitors of the drive. This may cause danger, or damage the unit.
PE
ohm
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