Measuring the insulation
￭
Measuring the insulation resistance of the drive
WARNING!
Do not do voltage withstand or insulation resistance tests on the drive. The
tests can cause damage to the drive. Every drive is 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.
￭
Measuring the insulation resistance of the motor and motor cable
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or
death, or damage to the equipment can occur. If you are not a qualified
electrical professional, do not do installation, commissioning or
maintenance work.
1. Do the steps in section Electrical safety precautions (page 44) 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 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
ohm
M
3~
U1
V1
W1
PE
46 Electrical installation
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