Electronic thermal relay function pre-alarm

What does TH mean?

This pre-alarm appears if the cumulative value of the electronic thermal O/L relay reaches or exceeds 85% of the preset level in Pr.9 (Electronic thermal O/L relay). It serves as a warning that the motor is approaching its thermal limit, and a protective shutdown will activate if 100% is reached.

• Motor winding temperature nearing the thermal overload limit.
• Excessive motor current draw over an extended period.
• Ambient temperature sensor reading indicates high operating temperature.
• Motor thermal model calculating a high temperature (e.g., based on P3-XX parameters).

Click steps to track your progress.

1. 1

   Reduce the load on the motor and/or decrease the frequency of operation.

2. 2

   Set an appropriate value in Pr.9 (Electronic thermal O/L relay) according to motor specifications and application requirements.

3. 3

   Check for conditions causing large load or sudden acceleration.