Electrical installation
77
Electrical installation
What this chapter contains
This chapter instructs in the cabling of the drive.
Warnings
WARNING! Only qualified electricians are allowed to carry out the work described in
this chapter. Follow the Safety instructions on the first pages of this manual. Ignoring
the safety instructions can cause injury or death.
Checking the insulation of the assembly
Drive
Every drive module has been tested for insulation between the main circuit and the
chassis (2500 V rms 50 Hz for 1 second) at the factory. Therefore, do not make any
voltage tolerance or insulation resistance tests (e.g. hi-pot or megger) on any part of
the drive.
Input cable
Check the insulation of the input cable according to local regulations before
connecting it to the drive.
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 U2,
V2 and W2.
2. Measure the insulation resistance between each phase conductor and the
Protective Earth conductor using a measuring voltage of 500 V DC. The
insulation resistance of an ABB motor must exceed 10 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.
ohm
M
3~
U1
V1
W1
PE
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