D106 Inverter Overload Fault in ABB ACS880 Drive

D106 Inverter Overload in the ABB ACS880 Drive indicates that the drive inverter has exceeded its allowable current or torque limits, and the overload condition has continued longer than the delay configured in Parameter 31.204 – Inverter Overload Delay. To protect the inverter power electronics from damage, the drive generates Fault D106 and stops operation.

The overload condition is monitored only when:

• The generating power exceeds 10% of the motor nominal power, and
• The actual motor speed is greater than 5% of the motor synchronous speed.

This fault generally indicates a problem with the load conditions, torque control, current limits, speed controller settings, or drive sizing, rather than an internal hardware failure.

Possible Causes

• Inverter current exceeded the allowable limit.
• Inverter torque exceeded the allowable limit.
• Parameter 31.204 – Inverter Overload Delay set too short.
• Excessive mechanical load.
• Sudden load changes causing high torque demand.
• Incorrect speed controller torque settings.
• Torque limit configured too high.
• Speed limit configured incorrectly.
• Power limit configured incorrectly.
• Current limit configured incorrectly.
• Motor undersized for the application.
• Drive undersized for the motor or load.
• Mechanical binding in the driven equipment.
• Incorrect motor parameter settings.
• Motor not properly tuned (ID Run not completed).
• Motor cable faults causing excessive current.

Solutions

• Cycle power to the drive and check whether the fault clears.
• Verify Parameter 31.204 – Inverter Overload Delay.
• Review the speed controller torque settings.
• Check the configured torque limits.
• Verify the speed limit settings.
• Review the power limit settings.
• Check the current limit settings.
• Inspect the driven machine for excessive mechanical load.
• Ensure the motor shaft rotates freely.
• Inspect the motor and motor cables for damage.
• Verify all motor cable connections are secure.
• Check the motor nameplate data in Parameter Group 99 – Motor Data.
• Perform a Motor ID Run if motor parameters have changed.
• Verify the drive is correctly sized for the application.
• Reduce excessive load if possible.
• Contact ABB technical support if the fault persists after inspection.

Additional Information

The ABB ACS880 continuously monitors the operating conditions of the inverter to protect its power semiconductors from excessive thermal and electrical stress.

Fault D106 is generated when the inverter operates above its permissible current or torque capability for longer than the delay specified by Parameter 31.204 – Inverter Overload Delay.

The overload protection becomes active only when:

• The motor is producing more than 10% of its nominal generating power, and
• The motor speed exceeds 5% of synchronous speed.

Common reasons for this fault include:

• Excessive mechanical loading.
• Incorrect torque controller tuning.
• Improper torque, speed, current, or power limit settings.
• Incorrect motor data.
• An improperly sized motor or drive.

A motor that has not completed a successful Motor ID Run may require excessive current to produce the requested torque, increasing the likelihood of inverter overload.

Unlike an Overcurrent Fault, which responds almost instantly to excessive current, D106 monitors continuous overload conditions that persist beyond the configured delay.

Common Symptoms

• Drive trips with Fault D106.
• Motor stops under heavy load.
• High motor current before the fault occurs.
• Excessive torque demand displayed.
• Fault occurs during acceleration or heavy-duty operation.
• Drive trips after operating under load for a short period.
• Motor struggles to accelerate.
• High load applications repeatedly generate the fault.
• Fault remains until reset.
• Production process stops unexpectedly.

Recommended Troubleshooting Sequence

1. Cycle power to the drive.
2. Verify Parameter 31.204 – Inverter Overload Delay.
3. Review the speed controller torque settings.
4. Check the torque limit configuration.
5. Verify the speed limit settings.
6. Review the power limit settings.
7. Check the current limit settings.
8. Inspect the driven machine for excessive load.
9. Ensure the motor shaft rotates freely.
10. Inspect the motor and motor cables.
11. Verify motor cable connections.
12. Check Parameter Group 99 – Motor Data.
13. Perform a Motor ID Run if recommended.
14. Verify proper drive and motor sizing.
15. Contact ABB technical support if the fault persists.

Inverter Overload Check Table

Check Point	Action
Power cycle	Restart the drive
Parameter 31.204	Verify Inverter Overload Delay
Speed controller torque	Review settings
Torque limits	Verify configuration
Speed limits	Check settings
Power limits	Verify configuration
Current limits	Review settings
Mechanical load	Inspect for excessive load
Motor shaft	Verify free rotation
Motor cables	Inspect for loose or damaged connections
Parameter Group 99	Verify Motor Data values
Motor ID Run	Perform if recommended
Drive sizing	Confirm suitability for the application
ABB technical support	Contact if the fault remains after inspection

Preventive Maintenance Tips

• Configure Parameter 31.204 – Inverter Overload Delay according to the application requirements.
• Periodically review torque, speed, current, and power limit settings.
• Complete a successful Motor ID Run during commissioning.
• Enter accurate motor nameplate data in Parameter Group 99 – Motor Data.
• Inspect motor cables and terminals during scheduled maintenance.
• Monitor mechanical equipment for increasing load or binding.
• Verify the drive and motor are correctly sized for the application.
• Maintain proper cooling and ventilation for the drive cabinet.
• Record recurring overload events to identify long-term loading trends.
• Perform preventive maintenance on driven equipment to minimize excessive torque demand.

Proper verification of Parameter 31.204 – Inverter Overload Delay, optimization of the speed controller torque settings, correct adjustment of the torque, speed, current, and power limits, and routine inspection of the motor, motor cables, and driven machinery will help prevent recurring D106 Inverter Overload faults in ABB ACS880 drives, ensuring reliable inverter protection, efficient motor performance, and dependable long-term operation of the drive system.