1. Do the steps in section Electrical safety precautions (page 24) 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
￭
Brake resistor assembly for R1…R3
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. Stop the drive and do the steps in section Electrical safety
precautions (page 24) before you start the work.
2. Make sure that the resistor cable is connected to the resistor and disconnected
from the drive output terminals.
3. At the drive end, connect the R+ and R- conductors of the resistor cable
together. Measure the insulation resistance between the conductors and the
PE conductor with a measuring voltage of 1000 V DC. The insulation resistance
must be more than 1 Mohm.
Electrical installation – North America 175
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