20 Most Recent Miller Spectrum 375 Cutmate Plasma Cutter 903891 Questions & Answers

if its on an extension cord then definitely. You need to run those on 220-240 or use s super short cord. Make sure you have good airflow too.

It sounds like you have a problem in the power supply input area. Make sure your voltage select switch is in the correct location. Unplug the unit and switch back and forth between the two positions to clean the contacts. Try again. If still bad check you terminal lug connections on the input lead wires. If still bad please answer these questions.

Does the power indicator come on at all? Does the fan start?

Check the contactor contacts for pitting. if severly pitted, replace contactor. If a death grip on the switch makes it work better then a light touch- replace the trigger switch.

The cable or cutting head may be damaged. The power connections may be loose, an internal circuit breaker may have failed. If the cooling fan does not come on, check the wiring in the cabinet for damaged wires. Disconnect fan wires- noting where each connected and check to see if the fan burned out- if it did, replace the fan and it chould begin to work correctly. If the fan checks out okay- it will have 2 discrete sets of windings-one for the fan, the other to provide control voltage.Check that board with the rectifiers as a rectifier may have failed or there may be a fuse on the board.If it were mine, I would check everything under the cabinet after it has been thoroughly blown clean.

always remember the ground...have a big air supply. small compressors can not keep up and machine stops cutting.

There are a few things about plasma cutting safety that are different from general welding safety tips This short list of plasma cutter safety tips is geared toward light duty plasma cutting using compressed air not large industrial units that use gas mixtures and water cutting tables. Electric Shock Can Kill - Operating a plasma cutter completes an electric circuit between the torch and the workpiece. The workpiece and anything touching the workpiece are part of the electrical circuit. - Never touch the torch body, workpiece or the water in a water table when the plasma system is operating. Voltages & Currents - Plasma cutter output voltages are much greater than welding voltages, usually 100-200 volts. Precautionary Measures - Do not pick up the workpiece, including the waste cutoff, while you cut. Leave the workpiece in place on the workbench with the work cable attached during the cutting process. - During plasma cutting operations do not move the work clamp. Wear insulated gloves and boots, and keep your body and clothing dry. - Do not stand, sit or lie on or otherwise touch any wet surface when using the plasma cutter system. - Insulate yourself from work and ground using dry insulating mats or covers big enough to prevent any physical contact with the work or ground. If you must work in or near a damp area, use extreme caution. Work Cable - Ensure metal-to-metal contact between work cable and workpiece or work table. - Work cable clamp should make contact with clean metal free of rust, dirt, painted surfaces, etc. - Do not attach work cable to the piece that will fall away when the cut is complete Plasma cutter Arc Rays Plasma cutter arc rays produce intense visible and invisible (ultraviolet and infrared) rays that can burn eyes and skin. Protective Clothing - Guantlet gloves, safety shoes and hat. - Flame-retardant clothing to cover all exposed areas. - Cuffless trousers to prevent entry of sparks and slag. - Remove combustibles, such as a butane lighter or matches, from your pockets before cutting. Noise Levels of Plasma Arc Cutting - Plasma arc cutting systems can generate noise levels in excess of 120 dB during high-amperage cutting operations. - Ear protection should be used when operating or working near plasma arc cutting operations. Toxic Fumes & Gases Plasma arc cutting can produce toxic fumes and gases that deplete oxygen and cause serious injury. - Keep the cutting area well ventilated or use an approved air-supplied respirator. - Do not cut in locations near degreasing, cleaning or spraying operations. The vapors from certain chlorinated solvents decompose to form phosgene gas when exposed to ultraviolet radiation. Pacemakers & Hearing Aids - Pacemaker and hearing aid operation can be affected by magnetic fields from high currents. Pacemaker and hearing aid wearers should consult a doctor before going near any plasma arc cutting and gouging operations Overall Plasma Safety - The plasma arc cutting process can be very safe. - By paying attention to safety standards and correctly setting up and operating the system, plasma arc cutting poses no more a threat than most welding processes.

You may need a better air supply. Also check the tip. This sometimes happens with mine when the tip gets pitted, not sure why but changing the tip sorts it out. They are fussy machines in some ways. Dont like dirty material, need a good earth.

loosen the retainer cap and twist the consumables and retighten