ACS550-02/U2 User’s Manual 35
Installation
Checking the insulation of the installation
Drive
Do not make any voltage tolerance or insulation resistance tests (e.g. hi-pot or
megger) on any part of the drive as testing can damage the drive. Every drive has
been tested for insulation between the main circuit and the chassis at the factory.
Also, there are voltage-limiting circuits inside the drive which cut down the testing
voltage automatically.
Input cable
Check the insulation of the input cable according to local regulations before
connecting it to the drive.
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 500 V DC. The insulation resistance of
an ABB motor must exceed 10 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.
ohm
M
3~
U1
V1
W1
PE
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