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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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