PTC Fault (Motor Overheating)
Schneider Electric · Altivar Machine ATV320 Variable Speed Drive
What does OtFL mean?
A motor overheating detected error from a PTCL (Positive Temperature Coefficient Logic) standard product. This indicates that the PTC thermistor embedded in the motor windings has exceeded its trip temperature, signaling a critical motor overheating condition. Continuous operation will severely damage the motor.
Complete Troubleshooting Guide
- 1
Allow the motor to cool down completely.
- 2
Check the motor's mechanical load and reduce it if excessive.
- 3
Verify proper motor ventilation and ensure cooling fins are clean and unobstructed.
- 4
Check the PTC probe wiring for continuity, correct connection to the drive, and proper isolation.
- 5
Ensure the motor's rated current and operating parameters are correctly configured in the drive.