Measuring the insulation
Measuring the insulation is typically not required in North America.
￭ Measuring the insulation of the drive system
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 of the input cable
Before you connect the input power cable to the drive, measure its insulation according to
local regulations.
￭ 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.
Stop the drive and do the steps in section Electrical safety precautions (page 14) 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 exceed 100 Mohm (reference value at 25 °C [77 °F]). For the
insulation resistance of other motors, consult the manufacturer’s instructions.
Note: Moisture inside the motor casing reduces the insulation resistance. If moisture
is suspected, dry the motor and repeat the measurement.
1000 V DC,
>
100 Mohm
U1-PE, V1-PE, W1-PE
M
3~
U1
V1
W1
PE
ohm
￭ Measuring the insulation of brake resistor and resistor 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.
70 Electrical installation – North America
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