Lincoln Electric SVM149-A service manual Operation, Safety Precautions, Description

B-2 OPERATION B-2

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Read and understand this entire section before operat- ing the machine.

SAFETY PRECAUTIONS

WARNING

ELECTRIC SHOCK can kill.

•Do not touch electrically live parts or electrode with skin or wet clothing.

•Insulate yourself from work and ground.

•Always wear dry insulating gloves.

FUMES AND GASES

can be dangerous.

• Keep your head out of fumes.

•Use ventilation or exhaust to remove fumes from breathing zone.

WELDING, CUTTING and

GOUGING SPARKS

can cause fire or explosion

•Keep flammable material away.

•Do not weld, cut or gouge on containers that have held combustibles.

ARC RAYS can burn.

•Wear eye, ear and body protection.

PLASMA ARC can injure

• Keep your body away from nozzle and plasma arc.

•Operate the pilot arc with caution. The pilot arc is capable of burning the operator, others or even piercing safety clothing.

Observe additional Safety Guidelines detailed in the beginning of this manual.

DESCRIPTION

The PRO-CUT 25 is a constant current, continuous control plasma cutting power source. It provides supe- rior and reliable starting characteristics, cutting visibili- ty and arc stability. The control system has a safety mechanism to insure that the nozzle and electrode are in place before cutting or gouging. This is extremely important due to the high voltages involved.

The PRO-CUT 25 comes standard with an air regula- tor and pressure gauge. The machine also comes with an input power cord. Hand-held torches are available in 15' or 25' cable. Consumables are included with each Pro-Cut purchase so that cutting can begin right out of the box. Consumables can also be ordered as individual packages.

The PRO-CUT 25 initiates the plasma arc with a sim- ple, yet reliable, touch start mechanism. This system eliminates many of the failure problems associated with hi-frequency start systems.

PREHEAT TEMPERATURE FOR PLASMA CUTTING

Preheat temperature control is not necessary in most applications when plasma arc cutting or gouging. Preheat temperature control may be necessary on high carbon alloy steels and heat treated aluminum for crack resistance and hardness control. Job conditions, pre- vailing codes, alloy level, and other considerations may also require preheat temperature control. The following minimum preheat temperature is recommended as a starting point. Higher temperatures may be used as required by the job conditions and/or prevailing codes. If cracking or excessive hardness occurs on the cut face, higher preheat temperature may be required. The rec- ommended minimum preheat temperature for plate thickness up to 1/2" (12.7mm) is 70°F (21.1°C).

PRO-CUT 25