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38 Electrical installation
Measuring the insulation of the brake resistor circuit
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
you start the work.
2. Make sure that the resistor cable is connected to the resistor and disconnected from the
drive output terminals.
3. At the drive end, connect the R+ and R- conductors of the resistor cable together. Measure
the insulation resistance between the conductors and the PE conductor with a measuring
voltage of 1000 V DC. The insulation resistance must be more than 1 Mohm.
Connecting the brake resistor cables and thermal switch
Connection diagram
￭
This diagram shows the brake resistor cable connections and an example connection of
the thermal switches.
The diagram also shows the internal connections of the brake chopper module cubicle done
by ABB.
Electrical safety precautions (page 35)
ohm
1 kV DC,
> 1 Mohm
R+
R-
PE
before
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