F0022 Supply PHASE LOSS Fault in ABB ACS550 Drive

F0022 Supply PHASE LOSS in the ABB ACS550 Drive indicates that the drive has detected excessive ripple in the DC bus voltage caused by the loss of one input power phase or an input supply imbalance. The ACS550 continuously monitors the intermediate DC circuit. If the DC voltage ripple exceeds approximately 14% of the nominal DC voltage, the drive generates Fault F0022 and stops operation to protect the rectifier, DC bus capacitors, and inverter power module.

This fault generally indicates a problem with the incoming three-phase power supply, blown input fuse, or supply imbalance, rather than the motor or load.

Possible Causes

• One input power phase is missing.
• Blown input line fuse.
• Input power supply imbalance.
• Loose input power connection.
• Damaged input cable.
• Single-phasing of the incoming supply.
• Defective circuit breaker or contactor.
• Poor electrical connection at input terminals.
• Excessive DC bus voltage ripple.
• Fault function parameter configured to trip on phase loss.
• Weak or unstable utility power supply.
• Internal rectifier failure (less common).

Solutions

1. Check the input power line fuses and replace any blown fuses.
2. Verify that all three input phases are present.
3. Check for input power supply imbalance.
4. Measure the input line-to-line voltages and ensure they are balanced.
5. Inspect the input power cables and terminals for loose or damaged connections.
6. Check the incoming circuit breaker and contactor.
7. Verify the fault function parameter setting related to supply phase loss.
8. Restore a balanced three-phase power supply.
9. Reset the fault and restart the drive.
10. If the fault persists with a healthy power supply, inspect the rectifier section of the drive.

Additional Information

The ABB ACS550 continuously monitors the intermediate DC bus voltage.

Fault F0022 is generated when the DC bus voltage ripple exceeds approximately 14% of the nominal DC voltage, typically because one of the incoming AC phases is missing or significantly unbalanced.

According to ABB, the first corrective actions are to:

• Check the input power line fuses.
• Verify that all three supply phases are present and balanced.
• Check the relevant fault function parameter settings.

Unlike an Undervoltage Fault, F0022 Supply PHASE LOSS specifically indicates excessive DC bus ripple caused by phase loss or supply imbalance, not simply low supply voltage.

Common Symptoms

• Drive displays F0022 Supply PHASE LOSS.
• Motor stops unexpectedly.
• Fault occurs during startup or while running.
• One input fuse may be blown.
• Incoming voltage measurements are unbalanced.
• Increased DC bus ripple.
• Reduced motor performance before tripping.
• Drive may hum or vibrate abnormally.
• Fault may occur intermittently with unstable utility power.
• Drive will not restart until the supply problem is corrected.

Recommended Troubleshooting Sequence

1. Verify that the fault is F0022 Supply PHASE LOSS.
2. Disconnect power and follow lockout/tagout procedures.
3. Inspect all input power line fuses.
4. Replace any blown fuses.
5. Measure all three input line voltages.
6. Verify that the voltage imbalance is within acceptable limits.
7. Inspect the input power cables and terminals.
8. Check the incoming circuit breaker and contactor.
9. Verify the fault function parameter settings.
10. Restore a balanced three-phase supply.
11. Reset the fault.
12. Restart the drive.
13. Monitor the DC bus voltage and input supply.
14. If the fault persists, inspect the drive's input rectifier.
15. Contact ABB technical support if necessary.

F0022 Supply PHASE LOSS Check Table

Check Point	Action
Input power line fuses	Inspect and replace if blown
Three-phase supply	Verify all phases are present
Input voltage	Measure and confirm balanced voltages
Input power cables	Inspect for loose or damaged connections
Circuit breaker/contactor	Verify proper operation
DC bus ripple	Check for excessive ripple if diagnostic tools are available
Fault function parameters	Verify correct settings
Rectifier section	Inspect if supply is normal but fault remains
Drive operation	Confirm normal operation after repair
ABB technical support	Contact if the fault persists

Preventive Maintenance Tips

• Periodically inspect and tighten input power terminals.
• Check input fuses during routine maintenance.
• Monitor the incoming three-phase voltage for imbalance.
• Replace aging or damaged power cables.
• Inspect contactors and circuit breakers for reliable operation.
• Maintain a stable, balanced power supply.
• Verify fault function parameter settings after commissioning or maintenance.
• Record recurring F0022 faults to identify long-term power quality issues.
• Protect the drive from repeated single-phasing events.
• Perform regular preventive maintenance according to ABB recommendations.

Proper inspection of the input power line fuses, three-phase supply, input voltage balance, power cables, fault function parameter settings, and DC bus condition will help prevent recurring F0022 Supply PHASE LOSS faults in ABB ACS550 drives, ensuring stable DC bus voltage, reliable inverter operation, and long-term system performance.