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April 24th, 2017 06:00

K805N Online Rack UPS 4200W - overvoltage protection

hello, 

i have K805N Online Rack UPS 4200W that has a problem: receive overvoltage problem.

If i turn it on with a light bulb in the out, the light will power on and then imediatly receive over voltage protection. 

I have spent over 200euro and change by myself all mosfets and diodes that was damaged:

G60N100 – 6 buc.

FGL40N120 – 4 buc.

40TPS12A – 2 buc.

RHRG75120 – 2 buc.

CS60-12L01 – 1 buc.

RHR30120 – 3 buc.

RHRG 30120 – 2 buc.

and now i think is a problem with the feedback/ stabilisation. 

I`m an engineer, i know that to do if you will help me but without a schematic is very hard to understand it.

can you give me a help? or schematic?

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