My 250V UV ballast box blew its control board. I bought a identical model on ebay from the US and when it arrived the plate on the back stated 90-130VAC. I was hopping the US item was dual voltage so I could just start using it. If it was not, my plan was to swap in the power supply from my dud 250V box.
Opened the US box and saw that the internal components were identical to my 250V box. I have attached a photo of the components with a close up of the power supply and circuit breaker from the US box. The labels are IDENTICAL on the US and UK boxes. I therefore thought that there should be no problem running the new US box off the UK 250V supply. When I turned it on it worked but after a minute there was a smell of burning. I discovered this was coming from the fan, which on close inspection has a 115V label on it.
My question is about the power supply unit. Can someone please interpret the circuit diagram on the label for me. Is it possible that this unit puts out 115 or 250V depending on the input? I find this hard to believe. However, it would explain why the US box has a 115V fan that is burning up with the 250 V input. One last piece of info is that all the brown wires that I can get the meter on are showing 250VAC when I connect the UK mains.
Thanks for your help.
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Here is a photo of the board. It does not look like would be easy to convert it to run on 250V. I therefore think it would be best to add a chassis transformer after the emi. What do you guys think?
Best Answer
That's not a power supply, it's a line filter: -
NO!