20 Most Recent RTO THERMAL DYNAMICS CUTMASTER 52 PLASMA CUTTER 1-5130- 1 Questions & Answers

We had the same problem. Try and replace the swirl ring in the torch head. It costs around 35 dollars. It worked for us.

Try and replace the swirl ring. We had the same problem and it fixed it. They cost around 35 bucks

Hi,
To find out why the fuse keeps cutting off you will need to open that up and trace down the problem with an OHM meter...
You may find a black spot where it is shorting or arcing, but if not then the circuits will have to be traced and eliminated one by one till you find the source of the problem...
It could be anything from bad wire or connection to a bad transformer..

heatman101

There is a resettable breaker inside the machine that cuts off power to the plasmahead when tripped. Check that and make sure the head is secore to cable and cable is secure to machine.If it still fails to function check the coil in the contactor to make sure it has not burned out. Also check the pressure switch to make sure it closes contacts to make the circuit when the unit is pressurized If switch is not functional the head will not operate. Also check gas solenoid or solenoids to make sure they do not have burned out coils as well. An Ohmmeter should show about 2000 ohms give or take some. The main contactor winding also. It may be the main contactor needs replacement- a loose power connection can lead to burned contacts. So if you hear the machine click when you press the trigger, but no power to head, and all the other items mentioned still leaves you with no power at the head, that main contactor is the likely culprit.If IGBT's had failed- they would blow apart part of their plastic case.So a quick visual is usually adequate for those.

Louis D Biasi You resurrected a 12 year old unanswered question which will now stick on the Homepage, 'Unsolved' despite being answered. It is always better to make a squeaky fresh, clean question of your own. The area where you posted is the 'Additional Information' information are so perhaps the OP can take his apart for you, but where the trigger connects should be pretty straight forward. Electrical schematics are available. Here are some manuals https://www.manualslib.com/brand/mishto/welding-system.html But is appears to also go by the name of 'Rossi'. Better manual here https://www.manualslib.com/products/Rossi-Welders-Weld-Mig220bz-3941072.html ..

I have the same problem with the Mighty Mig...Did you find these resistor values?