Lincoln Electric SVM146-A Controls and Settings, Cutting Operation, Pilot ARC Considerations

B-5 B-5

OPERATION

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CONTROLS AND SETTINGS

FIGURE B.2 - CASE FRONT CONTROLS

	Reset	Gas
Status		Purge	Gas
	Button	Button
Indicators			Regulator
			Gauge

XXXX XXXX XXXX XXXX

Output		Gas
Control		Regulator
Knob		Knob
Consumable		PRO-CUT 80
Storage
(behind
door)
		Input
Torch		Power
		Switch
Connector
	Work
	Cable	Interface
		Connector

OUTPUT CURRENT CONTROL KNOB - Adjusts the amount of cutting current applied. Affects cutting speed, dross formation, cut width, heat zone and trav- el speed.

TORCH CONNECTOR - Quick- connect type coupling for the PCT 80 cutting torch.

WORK CABLE - Provides clamp and cable connection to workpiece.

ON/OFF POWER SWITCH - Turns machine on or off.

GAS REGULATOR KNOB - Adjusts compressed gas pressure delivered to the torch. Length of torch hose is an adjustment factor. Optimum setting is 70-75 psi. The gas purge button must be pressed in to set pres- sure.

GAS REGULATOR GUAGE - Provides gas presssure reading as set by the gas regulator knob.

GAS PURGE BUTTON - Used to check or set gas pressure. Push in and hold to check pressure, then continue to hold to set the pressure. Shuts off gas when released.

RESET BUTTON - Used to reset the machine following a safety circuit trip.

STATUS (DISPLAY) BOARD INDICATORS - Four lights indicating Power, Gas Low, Thermal and Safety.

Occasionally, the pilot arc may sputter or start inter- mittently. This is aggravated when the consumables are worn or the air pressure is too high. Always keep in mind that the pilot arc is designed to transfer the arc to the workpiece and not for numerous starts without cutting.

When the pilot arc is started, a slight impulse will be felt in the torch handle. This occurrence is normal and is the mechanism which starts the plasma arc. This impulse can also be used to help troubleshoot a "no start" condition.

CUTTING OPERATION

When preparing to cut or gouge, position the machine as close to the work as possible. Make sure you have all materials needed to complete the job and have taken all safety precautions. It is important to follow these operating steps each time you use the machine.

•Turn the machine's ON/OFF POWER SWITCH to the OFF position.

•Connect the air supply to the machine.

•Turn the main power and the machine power switch on.

-The fan should start.

-The pre-charge circuit will operate for 3 seconds, then the green "Power" status indicator should turn on.

-If the "SAFETY" status indicator is lit, push the "Reset" button. If there is no problem, the status indicator will go off. If there is a problem, refer to "STATUS INDICATOR" in this section.

•Be sure that the work lead is clamped to the work- piece before cutting.

•Set the output current control knob for maximum current for high cutting speed and less dross forma- tion per Figure B.1. Reduce the current, if desired, to reduce the kerf (cut) width, heat affected zone or travel speed as required.

•Push-in and hold the Purge button to check or set the gas pressure. Pull the pressure regulator cap out and turn it to set the pressure.

-Adjust the gas regulator for 70 PSI for 25 foot (7.62m) torches or 75 PSI for 50 foot (15.24m) torches.

-Release the Purge button.

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PILOT ARC CONSIDERATIONS

The Pro-Cut has a smooth, continuous pilot arc. The pilot arc is only a means of transferring the arc to the workpiece for cutting. Repeated pilot arc starts, in rapid succession, is not recommended as these starts will generally reduce consumable life.

PRO-CUT 80