Electrical installation
62
Motor and motor cable
Check the insulation of the motor and motor cable as follows:
1. Check that the motor cable is connected to the motor, and disconnected from the
drive output terminals U2, V2 and W2.
2. Measure the insulation resistance between each phase conductor and the
Protective Earth conductor using a measuring voltage of 1000 V DC. The
insulation resistance of an ABB motor must exceed 100 Mohm (reference value
at 25 °C or 77 °F). For the insulation resistance of other motors, please consult
the manufacturer’s instructions. Note: Moisture inside the motor casing will
reduce the insulation resistance. If moisture is suspected, dry the motor and
repeat the measurement.
IT (ungrounded) systems
In units with EMC filter options (+E202 or +E200 in the type code), disconnect the
filter capacitors before connecting the drive to an ungrounded system. For detailed
instructions, see ACS800-01, -U1, -04 frames R2-R6 EMC filter disconnection
(3AXD00000168163 [English]).
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.
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