6SN1145-1BA01-0BA0

Hello All,

I have a question about infeed module 6SN1145-1BA01-0BA0 , when I power up with 400-480vac it does work for the first moment and Led's seems ok but after second output voltage "DC bus"600-700vdc drop to 300vdc and then I hear relay click so voltage goes back again to 600vdc and so on, I did replace to PB with a good one and nothing change so I think problem with CB but I don't know exactly what components are bad and need to be replace. if any one had same problem and was able to fix it please tell me what component that need to be replace and BTW I also did replace the 2 PC small cards on control board and still does the same problem. Thank you for your support

How you checked it?

In stand alone condition or with load connected condition?

problem has been solved!

I found a bad high voltage Relay and when I replaced , unit works fine. thank you