Cause : Motor overspeed comes when too high-speed has been detected, based on the speed feedback or on the estimated speed, depending on the settings.

"SOF" fault in Schneider ATV950 drive indicates "Motor overspeed fault". This means the motor has exceeded its maximum allowable speed. This condition can lead to potential damage to the motor and drive system.

Follow These Steps to Correct "SOF Fault":

1. Check Motor Parameters:

   • Verify Settings: Confirm that the motor speed settings in the drive configuration are correct and appropriate for the application.
   • Max Speed Setting: Ensure the maximum speed limit set in the drive matches the motor specifications.

2. Inspect Feedback Devices:

   • Feedback Signal: Check the feedback devices (e.g., encoders, tachometers) for proper operation and correct signal output.
   • Wiring Inspection: Ensure that the wiring to feedback devices is secure and free of damage.

3. Inspect Load Conditions:

   • Mechanical Load: Verify that the load connected to the motor is within acceptable limits and not causing the motor to exceed its speed.
   • Belt/Chain Slippage: Check for slippage in mechanical connections that could lead to inaccurate speed readings.

4. Run Diagnostics:

   • Diagnostic Tools: Use Schneider Electric diagnostic tools to analyze the drive’s performance and error logs.
   • Error Logs: Review logs for any additional issues or related faults that may have occurred.

5. Check for External Influences:

   • Control Signals: Ensure that external control signals are not inadvertently commanding the motor to exceed its speed.
   • Environmental Factors: Look for any conditions (e.g., vibrations, overheating) that may affect motor performance.