• personal protective equipment.
Measuring the insulation resistance - North America
￭
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 input power cable
Before you connect the input power cable to the drive, measure its insulation
resistance according to local regulations.
￭
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 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 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
92 Electrical installation – North America
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