Code

Name

Causes

Possible Solutions

oH3

Motor Overheat (PTC Input)

The thermistor wiring that detects motor temperature is defective.

Correct wiring errors.

A fault occurred on the machine.

Example: The machine is locked.

Examine the machine and remove the cause of the fault

The motor has overheated.

  • Check the load level, acceleration/deceleration time, and motor start/stop frequency (cycle time).

  • Decrease the load.

  • Increase the values set in C1-01 to C1-08 [Acceleration/Deceleration Times].

  • Set E2-01 [Motor Rated Current (FLA)] correctly to the value specified by the motor nameplate.

  • Make sure that the motor cooling system is operating correctly, and repair or replace it if it is damaged.

  • Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2, adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid Point A Voltage] and E1-10 [Minimum Output Voltage].

    Note:

    If the values set in E1-08 and E1-10 are too low, the overload tolerance will decrease at low speeds.
Note:

  • When H3-02, H3-10, or H3-06 = E [MFAI Function Selection = Motor Temperature (PTC Input)], the drive detects this fault if the motor overheat signal entered to an analog input terminal A1, A2, or A3 is more than the alarm detection level.

  • If the drive detects this error, the terminal set to H2-01 to H2-04 = 10 [MFDO Function Select = Alarm] will activate.

  • If the drive detects this error, it will operate the motor as specified by the stopping method set in L1-03 [Motor Thermistor oH Alarm Select].