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●How to check if the power supply is phase failure

Ans.

Please check the input power voltage must be 220V.  

The wires from electrical control box must be 220V for L1-L2=220V; L1-L3=220V; L2-L3=220V. 

And then test again by pressing RUN button to confirm if power supply is all Ok.

 

How to check if the power supply is phase failure Video:

https://www.dropbox.com/s/d80fyjb4b9yzygi/How%20to%20check%20power%20supply%20missing%20phase%20for%20CNC-350A2.mp4?dl=0