Cause : Motor Overheat Alarm (PTC Input) comes when the motor overheat signal to analog input terminal A1, A2, or A3 exceeded the alarm detection level. Detection requires setting multi-function analog inputs H3-02, H3-10, or H3-06 to E.

1. Check the size of the load, the accel/decel times, and the cycle times.
2. Decrease the load.
3. Increase the acceleration and deceleration times (C1-01 through C1-08).
4. Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
5. Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
6. Check the motor rated current.
7. Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
8. Ensure the motor cooling system is operating normally.
9. Repair or replace the motor cooling system.