Cause : Output phase loss comes when the drive has detected a loss of current on all three output phases. The fault could be caused by wiring problems, a blown fuse, or internal drive failures.

"OPF2" Output Phase Loss Fault in a Schneider ATV950 drive indicates that "one or more of the output phases are missing" or have a significant "imbalance". This means the drive has detected a loss of all three phase currents to the motor.

Follow These Steps to Correct an "OPF2 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.