￭ Measuring the insulation 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 Electrical safety precautions (page 18) 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
￭ Custom brake resistor assembly
Check the insulation of the brake resistor assembly (if present) as follows:
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or death,
or damage to the equipment can occur.
1.
Stop the drive and do the steps in section Electrical safety precautions (page 18) before
you start the work.
2. Check that the resistor cable is connected to the resistor, and disconnected from the
drive output terminals R+ and R-.
3. At the drive end, connect the R+ and R- conductors of the resistor cable together.
Measure the insulation resistance between the combined conductors and the PE
conductor by using a measuring voltage of 1 kV DC. The insulation resistance must be
higher than 1 Mohm.
110 Electrical installation
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