Magnum MIG 200MMA IGBT Welder Feeds Wire Continuously, Display Not Working

Question

Hello. I have a migum welder Magnum mig 200mma igbt. The problem is that the welder went on all the time after the warranty expired immediately popsula. He feeds the wire all the time. After disconnecting the pistol the roller is still spinning. In addition, the display on the welder does not...

bearq · Answer

Rather no fairies on the forum, give the welder to some service that will repair it if it is profitable at all. That this Magnum broke down right after the warranty is normal, such a company.

daniel9541 · Answer

I'm not looking for fairies in the forum. I'm just asking others if they had the case or they know it. .

bearq · Answer

Even if someone knows each other, no one can give you an answer through the forum, looking only at the center of the welder. Something has apparently been damaged and to diagnose it you should have such a system in front of you, make the appropriate measurements and only then you can comment on the damage or possible repair costs.

stasiekb100 · Answer

I have 280 with this case. I'll let you know how to fix it.

Added after 17 [hours] 28 [minutes]:

Diagnosis - damaged motor drive transistor and motor brake transistor. I don't know any other elements yet, I'll finish it.

Added after 19 [hours] 30 [minutes]:

The 15 V zener diode in the motor drive transistor gate control circuit has failed. The transistor went into linear operation and burned out, I replaced the transistor and the zener diode.

xavi77 · Answer

Hello. And can you ask for where are these elements and what to use?

xavi77 · Answer

Hello.

I replaced the igbt9z24 transistor, 15v zener diode and additionally a q5 8050 transistor, the welding machine fired normally, the display lit up, the engine did not run. After switching on the feed, the problem returned, i.e. the display is off, the engine is running all the time and something is popping up.

stasiekb100 · Answer

And the brake transistor colleague checked?

xavi77 · Answer

I did not check the order, but if something is broken there, it causes such a symptom.

xavi77 · Answer

Hello

I also replaced vt1 irfz 44 now the symptom is that the welding machine turns on, the display is lit, the engine is not working, but when you press the handle, listen to the gas valve while the engine is not turned on.

feniks_ · Answer

And the 7805 and 7812 stabilizers are ok? Surely it hasn't damaged or burned irf9z24 again?

xavi77 · Answer

Motor drive transistors listed. The welder works. Thanks for the help.

Magnum MIG 200MMA IGBT Welder Feeds Wire Continuously, Display Not Working

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Topic summary