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manual abstract
Plasma arc cutting requires higher voltages than welding to start and maintain the arc (200 to 400 volts dc are common), but also uses torches designed with safety interlock systems which turn off the machine when the shield cup is loosened or if tip touches electrode inside the nozzle. Incorrectly installed or improperly grounded equipment is a hazard. . Do not touch live electrical parts. . Wear dry, hole-free insulating gloves and body protection. . Insulate yourself from work and ground using dry insulating mats or covers big enough to prevent any physical contact with the work or ground. . Do not touch torch parts if in contact with the work or ground. . Turn off power before checking, cleaning, or changing torch parts. . Disconnect input power before installing or servicing this equipment. Lockout/tagout input power according to OSHA CFR 1910.147 (see Safety Standards). . Properly install and ground this equipment according to its Owner’s Manual and national, state, and local codes. . Check and be sure that input power cord ground wire is properly connected to ground terminal in disconnect box or that cord plug is connected to a properly grounded receptacle outlet – always verify the supply ground. . When making input connections, attach proper grounding conductor first. . Frequently inspect input power cord for damage or bare wiring – replace cord immediately if damaged – bare wiring can kill. . Turn off all equipment when not in use. . Inspect and replace any worn or damaged torch cable leads. . Do not wrap torch cable around your body. . Ground the workpiece to a good electrical (earth) ground if required by codes. . Use only well-maintained equipment. Repair or replace damaged parts at once. . Wear a safety harness if working above floor level. . Keep all panels and covers securely in place. . Do not bypass or try to defeat the safety interlock systems. . Use only torch(es) specified in Owner’s Manual. . Keep away from torch tip and pilot arc when trigger is pressed. . Clamp work cable with good metal-to-metal contact to workpiece (not piece that will fall away) or worktable as near the cut as practical. . Insulate work clamp when not connected to workpiece to prevent contact with any metal object. ELECTRIC SHOCK can kill. SIGNIFICANT DC VOLTAGE exists on internal parts of inverter power sources AFTER the removal of input power. . Turn Off unit, disconnect input power, check voltage on input capacitors, and be sure it is near zero (0) volts before touching any parts. Check capacitors according to instructions in Maintenance Section of Owner’s Manual or Technical Manual before touching any parts. OM-928 Page 1 EXPLODING PARTS can injure. . On inverter power sources, failed parts can explode or cause other parts to explode when power is applied. Always wear a face shield and long sleeves when servicing inverters. FLYING SPARKS can cause injury. Sparks and hot metal blow out from the cutting arc. Chipping and grinding cause flying metal. . Wear approved face shield or safety goggles with side shields. . Wear proper body protection to protect skin. . Wear flame-resistant ear plugs or ear muffs to prevent sparks from entering ears. ARC RAYS can burn eyes and skin. Arc rays from the cutting process produce intense visible and invisible (ultraviolet and infrared) rays that can burn eyes and skin. . Wear face protection (helmet or shield) with correct shade of filter to protect your face and eyes when cutting or watching. ANSI Z49.1 (see Safety Standards) suggests a No. 9 shade (with No. 8 as minimum) for all cutting currents less than 300 amperes. Z49.1 adds that lighter filter shades may be used when the arc is hidden by the workpiece. As this is normally the case with low current cutting, the shades suggested in Table 1 are provided for the operator’s convenience. . Wear approved safety glasses with side shields under your helmet or shield. . Use protective screens or barriers to protect others from flash and glare; warn others not to watch the arc. . Wear protective clothing made from durable, flame-resistant material (leather and wool) and foot protection. Table 1. Eye Protection For Plasma Arc Cutting Current Level In Amperes Minimum Shade Number Below 20 20 – 40 40 – 60 60 – 80 #4 #5 #6 #8 NOISE can damage hearing. Prolongednoise from some cutting applications can damage hearing if levels exceed limits specified by OSHA (see Safety Standards). . Use approved ear plugs or ear muffs if noise level is high. . Warn others nearby about noise hazard. FUMES AND GASES can be hazardous. Cutting produces fumes and gases. Breathing these fumes and gases can be hazardous to your health. . Keep your head out of the fumes. Do not breathe the fumes. . If inside, ventilate the area and/or use exhaust at the arc to remove cutting fumes and gases. . If ventilation is poor, use an approved air-supplied respirator. . Read the Material Safety Data Sheets (MSDSs) and the manufacturer’s instruction for metals to be cut, ...