Mitsubishi FR-A Series- FR-A800, FR-A770/A701, FR-A700, FR-A800-E, FR-A741 Drive
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Apr 01, 2024 7:29 am
Cause : PU disconnection comes when the inverter trips if communication between the inverter and PU is suspended, e.g. the operation panel or parameter unit is disconnected, when the disconnected PU disconnection function is valid in Pr.75 Reset selection/disconnected PU detection/PU stop selection.
- The inverter trips if communication errors occurred consecutively for more than permissible number of retries when Pr.121 Number of PU communication retries ≠ "9999" during the RS-485 communication.
- The inverter trips if communication is broken within the period of time set in Pr.122 PU communication check time interval during the RS-485 communication via the PU connector.
- Check that the operation panel (FR-DU08) or the parameter unit (FR-PU07) is connected properly.
- Check the Pr.75 setting.
- Fit the operation panel (FR-DU08) or the parameter unit (FR-PU07) securely.
