BR OVERHEAT
ABB · ACS800
What does 7112 mean?
The brake resistor connected to the ABB ACS800 drive is experiencing an overload condition, leading to excessive temperature. This fault (3.17 FW 5 bit 3) can reduce braking effectiveness, potentially damage the resistor or associated components, and indicates that the braking duty cycle may be too demanding or improperly configured.
Common Causes
- Brake resistor overload due to an excessive braking duty cycle for the application.
- Incorrect parameter settings for the brake chopper or resistor overload protection in parameter group 27 BRAKE CHOPPER.
- The braking cycle demands exceed the allowed limits for the installed brake resistor's thermal capacity.
- Excessive AC supply voltage to the drive can affect regenerative braking behavior.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Stop the ABB ACS800 drive and allow the brake resistor to cool down to a safe operating temperature before resuming operation.
- 2
Review and adjust parameter settings in group 27 BRAKE CHOPPER to ensure they match the installed brake resistor's specifications and the application's braking requirements.
- 3
Evaluate the braking duty cycle of the application; ensure it meets the specifications of the brake resistor. Reduce braking demands or consider a larger resistor if consistently hitting limits.
- 4
Measure the drive's AC supply voltage to confirm it is within specified limits and not excessively high, which can impact regenerative voltage levels.
- 5
Inspect the brake resistor for any visible signs of physical damage, such as burnt areas, cracks, or discolored components.