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44 Fault tracing and maintenance
Fault indications
A fault in the resistor brake circuit prevents fast motor deceleration and may cause the
drive to trip on a fault.
If a fault is detected by the chopper control board, the brake chopper disconnects the
brake resistor from the intermediate circuit, and the changeover switch of the fault
indication relay output is released. The relay output indicates the following faults:
•
brake resistor or resistor cable short circuit
•
brake chopper – IGBT – short circuit
•
chopper control board failure
•
chopper enable input signal switched off.
Note: The chopper is not able to switch off a short-circuit current. If the fault indication
relay output X3 is wired to the main contactor circuit of the drive, the main contactor will
open upon a fault. For wiring examples, see section
contactor and manual control switch(es)
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.
Chopper starts to function at
too low a DC voltage.
Inverter trips on fault 3210 DC
link overvoltage.
Brake resistor or chopper
overheats.
on page 26.
Cause
Chopper or resistor overheated.
No enable input received by
chopper control board.
Short circuit in power cables or
resistor.
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.
Chopper voltage setting too low.
Chopper voltage setting too high.
The maximum brake cycle
exceeded or resistor cooling
insufficient.
Chopper voltage setting incorrect
or jumper missing.
Equipping the drive with a main
Remedy
Check connections. Let equipment
cool.
Check that enable input is on.
Check power cables and resistor.
Contact local ABB representative.
Check voltage setting.
Check parameters of all inverters.
Check that enable input is on.
Check voltage setting.
Check voltage setting.
Check parameters of all inverters.
Check duty cycle and resistor
cooling.
Make sure that voltage setting is
correct and jumper is properly in
place.
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