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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check for conditions causing large load or sudden acceleration.