Very simple ---it is defective, send it to Siemens or Siemens contractor to repair.

I can repair it as well if you like you can send it to me

I have a problem with 6SN11-1BA02-0CA2

it is worked  normally for two to 6 hours then

LED 5   lit ( Line supply fault)

I  check ed power supply carefully and I found it is ok and inside I did not get anything loose.

I replaced it with another one ( spare one )  and it is worked normally on the same machine.

what can I do to solve this problem of this drive?

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Split from E/R Module (6SN1145-1BA02-0CA1) Troubleshooting.