S120, faults F7802 and F30027

Hellow

i have Repeated problem for S120 drive each time starting the drive it trippes 

gving faults F7802 and F30027  together , once we resset and start again it start normally without any problems, 

Note : before reset the fault the DC voltage is exist on AOP : 955 VDC

So can you tell me what is the problem and how to clear it

Thanks 

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Split from F30027 URGENT !!.

Thank you very much it was just as you explained and the problem solved