Hardware Manual

88 Electrical installation
 Motor and motor cable
Check the insulation of the motor and motor cable as follows:
1. Check that the motor cable is disconnected from the drive output terminals T1/U,
T2/V and T3/W.
2. Measure the insulation resistance between each phase conductor and then
between each phase conductor and the Protective Earth conductor using a
measuring voltage of 1000 V DC. The insulation resistance of an ABB motor must
exceed 100 Mohm (reference value at 25 °C or 77 °F). For the insulation
resistance of other motors, please consult the manufacturer’s instructions. Note:
Moisture inside the motor casing will reduce the insulation resistance. If moisture
is suspected, dry the motor and repeat the measurement.
 Brake resistor assembly
Check the insulation of the brake resistor assembly (if present) as follows:
1. Check that the resistor cable is connected to the resistor, and disconnected from
the drive output terminals R+ and R-.
2. 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.
ohm
M
3~
U1
V1
W1
PE
ohm
ohm
R-
R+
PE