Cause : Single output phase loss comes when one of the three output phases is missing or has a significant imbalance. The fault could be caused by issues such as wiring problems, a blown fuse, or internal drive failures.

"OPF1" Single output phase loss fault in Schneider ATV950 drive indicate "Single Output Phase Loss". This means the drive detects one of the motor phases has been lost.

Steps to Correct an "OPF1 Single Output Phase Loss Fault":

1. Immediate Actions:

   • Stop Operation: If the drive is running, stop it immediately to prevent any potential damage to the motor or drive.
   • Reset Error: Attempt to reset the error using the drive’s control panel. This may clear temporary issues.

2. Inspect Wiring and Connections:

   • Output Wiring: Check the wiring from the drive to the motor for any loose or disconnected wires. Ensure all connections are secure and properly terminated.
   • Continuity Check: Use a multimeter to check for continuity in the output wires. Ensure there are no breaks or disconnections.

3. Check Motor Connections:

   • Motor Terminals: Inspect the motor terminals for loose or corroded connections. Tighten any loose connections and clean any corrosion.
   • Internal Motor Wiring: If possible, check the internal wiring of the motor for any issues that might cause a phase loss.

4. Inspect Fuses and Circuit Breakers:

   • Fuses: Check any fuses in the drive's output circuit. Replace any blown fuses with ones of the correct rating.
   • Circuit Breakers: Ensure that any circuit breakers are in good condition and have not tripped.

5. Verify Parameter Settings:

   • Phase Loss Detection: Ensure that the phase loss detection settings in the drive are configured correctly. Adjust the sensitivity if necessary.
   • Current Limits: Verify that the current limit settings are appropriate for the motor and application.

6. Check for Internal Drive Issues:

   • Drive Components: Inspect the drive’s internal components, such as output transistors and capacitors, for any signs of damage or failure.
   • Diagnostic Tools: Use diagnostic tools or software provided by Schneider Electric to perform a thorough check of the drive’s internal systems.