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Fault tracing
Contents of this chapter
This chapter describes the fault tracing of the brake unit.
Fault indications
A fault in the resistor brake circuit prevents fast motor deceleration and can cause the drive
to trip on a fault.
If a fault is detected by the chopper control unit, the brake chopper disconnects the brake
resistor from the intermediate circuit, and the chopper fault indication relay output is
de-energized.
Depending on the application, the relay output either opens the drive main contactor/breaker
or gives a fault indication to the overriding control system. See the circuit diagrams delivered
with the unit.
Fault indication/Fault
Fault indication relay output
switches off the main power
or gives a fault indication to
an overriding control system.
Chopper does not function.
Cause
Chopper or resistor overheated.
Digital input for the temperature fault
is at value 0 = overtemperature, al-
though there is no overtemperature.
Short circuit in resistor or power cables.
Chopper control board failure. Chopper
damaged; it is not able to disconnect
resistor from intermediate circuit.
Chopper voltage setting too high.
Inverter overvoltage control is on.
Fault tracing 71
10
What to do
Let equipment cool.
Check temperature sensor connections
both at the brake control unit end, and
at the temperature sensor end.
Check sensor. Replace faulty sensor.
Check power cables and resistor.
Contact local ABB representative.
Check voltage setting.
Check parameters of all inverters.
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