A Welding Machine Shutting Down Due To A Broken Fan Repaired
A lot of welding technicians ignore the benefit of having a fan or two inside a welding machine. I am hearing this statement from technicians that as long the machine is up and running it does not matter if the fan was running or not as long there is welding going on.
This machine came to my shop for repair and the technician stated the fact that it was welding fine but the fan was not running so he kept ignoring the need for cooling inside the welding machine; it went into shut down for protection.
As I took the cover off this machine, I could see a lot of dirt and dust covering the inside board and that is not healthy for such machines.
With a heavy dust blower, I cleaned the machine on the inside and I am sure you can tell the difference between the two photos here.
As seen in the photo, this machine has two fans system; one to blow air inside and the other one to suck it out creating an air flow to cool down the Mosfets/IGBT’s inside the machine.
I powered the machine up and it was working fine.
The output voltages were according to specs but when I put my hand on one side of the vents, the air circulation was not right and one of the fans was rattling very loud which is an indication of a broken fan and as you see in the photo, my speculations was correct.
I have exactly the same fan in the shop and without hesitation; I replaced the fan right away and tested out the machine. The air flow was circulating fine this time. I closed the lid, put the screws on and call the customer for pick up.
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 article on A Water Pumping Motor Repaired On A Teeth Planting Device