Motor Thermal Overload

What does 80 mean?

This fault indicates that the motor's thermal model or external thermal sensor has detected an overheating condition. Continuous operation in an overheated state will degrade motor insulation, leading to premature motor failure and costly repairs or replacements. The drive trips to protect the motor.

• Sustained mechanical overload on the motor, causing excessive current draw and I²R heating.
• Insufficient motor cooling due to blocked ventilation fins, contaminated cooling fan, or high ambient temperature around the motor.
• Incorrect motor nominal current (P1-23) or motor thermal protection time constant (P1-24) set too low in the drive.
• External thermal sensor (e.g., PTC thermistor connected to terminals 53/54) reporting an over-temperature condition.
• Motor operating at very low speeds for extended periods in a non-forced ventilated motor (reduced cooling efficiency).

Click steps to track your progress.

1. 1

   Measure the actual motor current (via LCP display P06-00) during operation and compare against the motor's nameplate nominal current.

2. 2

   Inspect the motor's cooling fins and fan for obstructions, dust buildup, or damage, ensuring free airflow.

3. 3

   Verify the motor nominal current (P1-23) and motor thermal protection time (P1-24) are correctly configured per the motor nameplate.

4. 4

   If using an external thermistor, measure its resistance at terminals 53/54 (or appropriate analog input) and compare against sensor data sheet values.

5. 5

   Consider increasing acceleration/deceleration ramp times (P1-41, P1-42) to reduce transient thermal stress during frequent starts/stops.