Fault Tracing; Contents Of This Chapter; Fault Indications - ABB ACS880-607LC Hardware Manual

Fault tracing

Contents of this chapter

This chapter describes the fault tracing possibilities of the brake unit.

Fault indications

A fault in the resistor braking 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 chopper fault indication relay output is
de-energized.
Depending on the application, the relay output either opens the drive main circuit 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.
Cause
Chopper or resistor overheated.
No enable input received by chop-
per control board.
Short circuit in resistor or power
cables.
Chopper control board failure.
Chopper damaged; it is not able to
disconnect resistor from intermedi-
ate circuit.
Fault tracing 39
8
Remedy
Check connections. Let equipment
cool.
Check that enable input is on.
Check power cables and resistor.
Contact local ABB representative.