Motor Overload Trip (Electronic Thermal O/L Relay)

What does E.THM mean?

The FR-A800 inverter's internal electronic thermal overload relay has tripped, indicating that the motor has been subjected to a continuous overload condition exceeding its thermal capacity for an extended period. This protects the motor from overheating and damage.

• Continuous mechanical overload on the motor, causing it to draw current above its rated value.
• Incorrect electronic thermal overload relay setting in the FR-A800 inverter, not matching the motor's rated current.
• Insufficient motor cooling or poor ventilation at the motor.
• Motor winding damage or insulation degradation.
• Parameter P001 (Pr.9) (Motor capacity) or P002 (Pr.10) (Motor rated current) are incorrectly set.

Click steps to track your progress.

1. 1

   Inspect the motor and mechanical load for any binding, excessive friction, or blockages that could cause continuous overload.

2. 2

   Verify the motor's rated current from its nameplate and ensure parameter P002 (Pr.10) (Motor rated current) is set correctly in the FR-A800 inverter.

3. 3

   Check the motor's cooling fan and ensure adequate ventilation around the motor.

4. 4

   Measure motor winding resistance and insulation resistance to ground to check for internal motor damage.

5. 5

   If the motor operates at low speeds for extended periods, consider external cooling for the motor.