7310 Overspeed Fault in ABB ACS380 Drive

 Fault 7310 – Overspeed in the ABB ACS380 Drive VFD indicates that the motor speed has exceeded the maximum permitted speed. The drive trips to protect the motor and mechanical equipment from damage caused by excessive speed.

7310 Overspeed Fault in ABB ACS380 Drive


This fault is commonly caused by incorrect minimum/maximum speed settings, insufficient braking torque, or sudden load changes while operating in torque control mode.

Possible Causes

  • Incorrect minimum speed setting.
  • Incorrect maximum speed setting.
  • Insufficient motor braking torque.
  • Sudden load changes during torque control.
  • Brake chopper or braking resistor not installed where required.
  • Incorrect application of torque control.
  • High-inertia load causing overspeed.
  • Mechanical load driving the motor above its commanded speed.

Solutions

1. Check Speed Limits

  • Verify the speed limit settings:
    • Parameter 30.11 – Minimum Speed
    • Parameter 30.12 – Maximum Speed
  • Correct the values if they are set incorrectly.

2. Check Motor Braking Torque

  • Verify that the motor has sufficient braking torque to decelerate the load safely.
  • Increase braking capability if required.

3. Check Torque Control

  • Verify that torque control is appropriate for the application.
  • Check whether sudden load changes are causing the motor to accelerate beyond the speed limit.

4. Check Brake Chopper and Braking Resistor

  • Determine whether the application requires a brake chopper and braking resistor.
  • Install or verify proper operation if required.

Additional Information

The ABB ACS380 continuously monitors the motor speed. If the measured speed exceeds the maximum allowable value, the drive generates Fault 7310 – Overspeed to protect the motor, drive, and driven machine.

Typical causes include:

  • Incorrect speed parameter settings.
  • Regenerative load conditions.
  • Insufficient braking.
  • Torque-controlled applications with rapidly changing loads.

Common Symptoms

  • Drive displays 7310 – Overspeed.
  • Motor speed exceeds the configured limit.
  • Drive trips during deceleration or sudden load release.
  • Overspeed occurs in torque control mode.
  • Motor may freewheel after the trip.
  • Process stops unexpectedly.

Recommended Troubleshooting Sequence

  1. Verify that the displayed fault is 7310.
  2. Check Parameter 30.11 – Minimum Speed.
  3. Check Parameter 30.12 – Maximum Speed.
  4. Verify that the speed limits match the application requirements.
  5. Check the adequacy of the motor braking torque.
  6. Verify whether torque control is suitable for the application.
  7. Determine whether a brake chopper and braking resistor are required.
  8. Correct the settings or hardware as necessary.
  9. Reset the fault.
  10. Confirm normal drive operation.

7310 Overspeed Check Table

Check PointAction
Parameter 30.11Verify Minimum Speed setting
Parameter 30.12Verify Maximum Speed setting
Braking torqueEnsure sufficient braking capability
Torque controlVerify correct application
Load conditionsCheck for sudden load changes
Brake chopperInstall or verify operation if required
Braking resistorInstall or verify operation if required
Drive operationConfirm normal speed after reset

Preventive Maintenance Tips

  • Verify minimum and maximum speed settings during commissioning.
  • Ensure the braking system is properly sized for high-inertia loads.
  • Install a brake chopper and braking resistor where regenerative energy is significant.
  • Avoid sudden unloading in torque-controlled applications.
  • Periodically inspect braking components and wiring.
  • Monitor recurring 7310 faults to identify mechanical or application issues.
  • Verify motor and machine speed ratings before increasing speed limits.
  • Follow ABB commissioning and preventive maintenance recommendations for the ACS380 Drive VFD.

Proper verification of Parameters 30.11 and 30.12, adequate motor braking torque, correct use of torque control, and proper installation of a brake chopper and braking resistor will help prevent recurring 7310 – Overspeed faults in ABB ACS380 drives, ensuring safe and reliable operation.

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