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30 Electrical installation
Checking the insulation of the assembly
Inverter unit
￭
WARNING!
Do not do any voltage withstand or insulation resistance tests 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.
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 or maintenance work.
1. Do the steps in section
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,
ohm
> 100 Mohm
Connecting the control cables
See the chapter on control units for the default I/O connections. Note that the default I/O
connections can be affected by some options. See the circuit diagrams delivered with the
drive for the actual wiring.
Electrical safety precautions (page 27)
V1
before you start the work.
U1
U1-PE, V1-PE, W1-PE
M
3~
W1
PE
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