F7801 fault in Siemens V70 Drive indicates a Motor overcurrent. This means the motor drew more current than its permissible limit, which can be caused by a short circuit, aggressive ramping, or a heavy mechanical jam.
Cause: The permissible motor limit current was exceeded.
- Effective current limit set too low.
- Current controller not correctly set.
- Motor was braked with an excessively high stall torque correction factor.
- Up ramp was set too short or the load is too high.
- Short-circuit in the motor cable or ground fault.
- Motor current does not match the current of Motor Module.
Remedy:
- Reduce the stall torque correction factor.
- Increase the up ramp or reduce the load.
- Check the motor and motor cables for short-circuit and ground fault.
- Check the Motor Module and motor combination.
