Plasma Cutter

[bdierks]

So i am haveing a problem with my plasma cutter. I start to cut and it cuts just fine for a couple of inches, but then it just stops. and it wont let me start again with out turning off the power and letting it set for a few seconds. if i dont do that, it just makes a beeping sound. i can go a little farther on sheetmetal, but when i do like 1/4 in. it stops after about 2 inches. I have tried more air presure and i have tried less air presure. It is a Thermal Dynamics Cuttmaster 51, witch should be able to cut up to 1/2 inch. any help would be great, thanks