ABB ACS880-01 Series, Hardware Manual

Page: 82 / 224

82 Electrical installation
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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 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
R-
R+
PE
ACS880-01 HW.book Page 82 Monday, July 1, 2013 4:51 PM