Question about RTO Esab Handy Plasma 550 W/25' Pt 31XL Torch 0558002612

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ESAB 550 plasma cutter will not shut off, I suspect a bad switch

The on & off switch will not shut the machine off, I have to unplug or shut off breaker. Could it be more than just a bad switch?

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Unlikely, the switch poles are not making contact or a wire has come adrift from one of the swiutch poles.

Posted on Jun 23, 2009

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1 Answer

Fault light is on all the time. Is there a fuse ?


Hi:
No there is no fuse for the fault light. Fault light it's on only when:
1) Voltage is wrong or not enough.
2) Overheated machine and needs to cool down.
3) Your airflow is too weak.
Check your owners manual section 5 for more info.

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1 Answer

The gas light come on and flashes and wont cut. I have changed all the nozzels on the torch and still nothing?


Hi:

Gas light goes on when you have an air flow or pressure problem. Do you have enough pressure? you will need at least 120 psi at the compressor and 75psi at the plasma machine. Do you have enough flow? You will need 20 SCFH and a 30 gallon compressor reserve tank.

Let me know if this help. Please vote.

Jul 30, 2011 | RTO Esab Power Cut 1250 Plasma W/Pt 32EH...

1 Answer

Is the esab 1250 worth buying and how much should i buy it for


Hi:
Esab's plasmas and machines are the best for manufacturing and shop maintenance. Are made for the tough jobs. Retail price brand new price is around 3200.00 US dollars.Cutting wise is a high speed cutting machine and will cut up to 1-1/2".

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1 Answer

My plasma cutter just flashes fault everytime you try and use it. could it be the ground or would it be the electrod


check the main lead to the torch,if there is a cut or any hole in the rubber coating it will show fault,the unit uses high frequencey so if the lead has a cut it wont fire up.

Jan 22, 2010 | RTO Esab Plasma Electrode 0558001969 PKG/2

1 Answer

Just got a used Snap on Plasma25. Put new Tip and elctode in it. Worked great for a few cuts then the Red Light on front of the machine came on and now wont do anything?? I dont have the manual so I dont...


I am not familiar with the guts of a snap on 25 amp plasma, but i have extensive experiance repairing inverter based cutters. 2 common problems which would cause this type of malfunction is the thermal protection circuitry, and mosfet failure. The first is easier to check and is the likely culprit. If the unit is Mosfet based, and i suspect it is, located on the aluminum heat sink the mosfets are mounted to, is a button sized device with 2 wires coming out of it. This is a normally closed switch with bi-metallic contact points inside. When it gets hot, the switch opens, and shuts down the output of the machine untill it cools off again. Many times, these arms dont quite return to their normal closed position if you exceed the duty cycle often. unplug the wires from this switch and check for continuity, if its open, you can temporarily bypass this by running a jumper across the terminals on the switch. If this gets your machine running, i advise you to replace the switch, dont operate it with the jumper in place...... If this isnt the problem, the feed back circuitry driving the mosfets is more than likely detecting a shorted mosfet. A 25 amp machine may have 9 mosfets, paired off in sets of 3, which handle abt 3 amps apiece.....chances are all 3 would have blown if there was a failure, check for obvious damage, a blown mosfet in most instances can be detected visually as 9 times out of 10, they explode..lol...hope this helps, good luck

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1 Answer

Pulsating Arc


Sounds like one or two of the power diodes are defective (open), producing a half wave pulse instead of full wave, giving it a dotting effect.

Apr 19, 2009 | RTO Esab Handy Plasma 550 W/25' Pt 31XL...

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