Motor overload temperature

What does 10 mean?

According to the electronic thermal protection (ETR), the motor is excessively hot due to prolonged operation above 100% load. This indicates a severe mechanical overload on the motor. Ignoring this alarm can lead to permanent motor damage or reduced lifespan. The frequency converter can be configured to issue a warning or alarm based on the counter reaching 100% in parameter 1-90.

• Sustained mechanical overload on the motor due to process changes (e.g., increased viscosity, blockage).
• Motor cooling fan damaged, obstructed, or drawing insufficient airflow, leading to reduced heat dissipation.
• Incorrect motor nameplate data (e.g., P1-20 Motor Current, P1-25 Motor Thermal Protection) entered into the drive.
• Motor shaft or driven equipment bearings failing, increasing mechanical friction and load.
• Operation at low speeds for extended periods without independent motor cooling (e.g., forced ventilation).

Click steps to track your progress.

1. 1

   Measure actual motor current (Amps) on each phase (terminal U, V, W) with a clamp meter and compare to P1-20 Motor Current.

2. 2

   Verify drive parameters P1-20 (Motor Current), P1-22 (Motor No-load Current), and P1-25 (Motor Thermal Protection) match the motor nameplate.

3. 3

   With power off, manually rotate the motor shaft and driven equipment to check for mechanical binding or excessive friction.

4. 4

   Inspect the motor's external cooling fan for obstructions, damage, or proper rotation.

5. 5

   If operating at low speeds, confirm the motor has forced ventilation or adjust minimum speed (e.g., P1-03) to ensure adequate self-cooling.