PTC Fault (Motor Overheating)

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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify proper motor ventilation and ensure cooling fins are clean and unobstructed.

2. 4

   Check the PTC probe wiring for continuity, correct connection to the drive, and proper isolation.

3. 5

   Ensure the motor's rated current and operating parameters are correctly configured in the drive.