Four IGBT Shorted On a Dead Welding Machine
It is a 200 amp welding machine that went dead and usually with this kind of machines if the IGBT get shorted, the whole machine will go dead. So I headed directly to these parts.
As I took the screws off I was able to see what inside and machine and it looked brand new.
The first place to look was the IGBT’s located on this heat metal shield.
I could see four IGBT’s there and when I started testing them while on board, I got the indication that all four of them were shorted.
And as expected, when I took them off board and tested them again, all four IGBT’s were shorted and needed replacement.
I called the customer to tell him my repair price and although I went as low as I can with the price, he did not agree.
Although the customer and I did not agree on the price, I went ahead and turned the machine on after disconnecting the pins of the IGBT’s from the board and as you can see, the machine was up and running.
There will be no voltages on the output of the machine terminals and because of that, no welding can be done. I just turned it on for a few seconds to make sure all is well. Anyway, the machine is still in my shop waiting for the customer to pick it up, until then be safe.
Mission Almost Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous repair articles in the link below: