1.
Do the steps in section Electrical safety precautions (page 57) before you start the work.
2. Make sure that the motor cable is disconnected from the drive output terminals.
3. Measure the insulation resistance between each phase conductor and the protective
earth conductor. Use 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 [77 °F]). For the
insulation resistance of other motors, refer to the manufacturer’s instructions.
Note: Moisture inside the motor casing reduces the insulation resistance. If you think
that there is moisture in the motor, dry the motor and do the measurement again.
1000 V DC,
>
100 Mohm
U1-PE, V1-PE, W1-PE
M
3~
U1
V1
W1
PE
ohm
60 Electrical installation