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.

Complete Troubleshooting Guide

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.