Mitsubishi FR-A Series- FR-A800, FR-A770/A701, FR-A700, FR-A800-E, FR-A741 Drive
1
Posts
1
Users
0
Reactions
195
Views
Apr 01, 2024 5:05 am
Cause : Electronic thermal relay function pre-alarm comes when the cumulative value of the electronic thermal O/L relay reaches or exceeds 85% of the preset level of Pr.9 Electronic thermal O/L relay. If the value reaches 100% of Pr.9 setting, motor overload trip (E.THM) occurs.
- Check for large load or sudden acceleration.
- Check that the Pr.9 setting is appropriate.
- Reduce the load and frequency of operation.
- Set an appropriate value in Pr.9.
