Checking The Insulation Of The Assembly; It (Ungrounded) Systems - ABB ACS800-01 Hardware Manual

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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. Check the insulation of the assembly as follows.
WARNING! Check the insulation before connecting the drive to the mains. Make
sure that the drive is disconnected from the mains (input power).
1. Check that the motor cable is disconnected from the drive output terminals U2,
V2 and W2.
2. Measure the insulation resistances of the motor cable and the motor between
M
each phase and the Protective Earth by using a measuring voltage of 1 kV DC.
ohm
The insulation resistance must be higher than 1 Mohm.
PE

IT (ungrounded) systems

Disconnect the EMC filter capacitors of selections +E202 and +E200 before
connecting the drive to an ungrounded system. For detailed instructions on how to
do this, please contact your local ABB distributor.
WARNING! If a drive with EMC filter selection +E202 or +E200 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.
Electrical installation