Mitsubishi FR-A Series- FR-A800, FR-A770/A701, FR-A700, FR-A800-E, FR-A741 Drive
1
Posts
1
Users
0
Reactions
213
Views
Mar 30, 2024 7:35 am
Cause : PTC thermistor operation comes when the inverter output when the motor overheat status is detected for 10s or more by the external PTC thermistor input connected to the terminal AU. This fault is available when "63" is set in Pr. 184 AU terminal function selection and AU/PTC switchover protective function is not available.
- Check the connection between the PTC thermistor switch and thermal protector.
- Check the motor for operation under overload.
- Is valid setting ( = 63) selected in Pr. 184 AU terminal function selection ?
- Reduce the load weight.
