ABB ACQ810-04, Hardware Manual, Page: 71 / 144

Installation 71

Motor and motor cable
Check the insulation of the motor and motor cable as follows:
1. Check that the motor cable is 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 500 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.
Checking the compatibility with IT (ungrounded) systems
The drive is not suitable for use in an IT (ungrounded) system as standard. Disconnect the
grounding wire of the AIBP board before connecting the drive to the supply network as
instructed below.
WARNING! If a drive is installed on an IT system (an ungrounded power system or a high
resistance-grounded [over 30 ohm] power system) without disconnecting the AIBP board
grounding wire, the system will be connected to earth potential through the varistors of the
board. This may cause danger or damage the unit.
1. Open the screws and remove the cover.
2. Disconnect the grounding wire.
ohm
M
3~
U1
V1
W1 PE
1
1
1 1
2