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Fault tracing
Contents of this chapter
This chapter describes the fault tracing possibilities of the brake unit.
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
control switch or switches (page
Equipping the drive with a main contactor and manual
22).
Fault tracing 53
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