F06010 Infeed: Power Unit Phase Failure fault in siemens drive

F06010 Infeed: Power Unit Phase Failure fault in siemens drive indicates that the one or more input phases are missing. 

Cause:
Blown fuse on one phase. Loose terminal connection on L1, L2, or L3. 

Remedy: 
- Check input voltage on all three phases. 
- Check tightening torque of terminals.

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