Motor And Motor Cable; It (Ungrounded) Systems - ABB ACS800-U1 Hardware Manual

60 Electrical installation

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 be more than 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 reduces 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
ACS800-01, -U1, -04 frames R2-R6 EMC filter disconnection
instructions, see
(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.
U1
V1
ohm
W1
M
3~
PE