F30011 fault in Siemens V70 Drive indicates a Line phase failure in the main circuit. This means the drive detected excessive ripple on the DC bus, usually indicating that one of the incoming AC supply phases has been lost or a fuse has blown.
Cause:
At the power unit, the DC link voltage ripple has exceeded the permissible limit value.
Possible causes:
- A line phase has failed.
- The 3 line phases are inadmissibly unsymmetrical.
- The fuse of a phase of a main circuit has ruptured.
- A motor phase has failed.
Remedy:
- Check the main circuit fuses.
- Check whether a single-phase load is distorting the line voltages.
- Check the motor feeder cables.
