Lincoln Electric SVM185-A service manual Electrode Polarity Shielding GAS Connection, Gmaw, Gtaw

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A-6				INSTALLATION						A-6
ELECTRODE POLARITY							SHIELDING GAS CONNECTION
The wire feeder is factory set for Electrode Positive								WARNING
welding.	Most	GMAW	welding	procedures		use		CYLINDER may	explode	if
Electrode	Positive	welding.	Most	GTAW	and	some
								damaged.
Innershield procedures use Electrode Negative weld-
ing.								• Keep cylinder	upright and
		CAUTION						chained to support.
							•	Keep cylinder away from areas where it may be
When changing the electrode polarity,					the weld			damaged.
cables must be changed at the power source studs							•	Never lift welder with cylinder attached.
and the DIP switch inside the wire feeder must be							•	Never allow welding electrode to touch cylinder.
properly set. Operation with the DIP switch in the							•	Keep cylinder away from welding or other live
wrong position will cause erratic arc performance.								electrical circuits.
								• BUILD UP OF SHIELDING GAS MAY
		WARNING						HARM HEALTH OR KILL.
								• Shut off shielding gas supply when not in
	ELECTRIC SHOCK CAN KILL.							use.
							• See American National Standard Z-49.1, "Safety
	• Turn the input power OFF at the weld-							in Welding and Cutting” Published by the
	ing power source before changing							American Welding Society.
	electrode polarity.						------------------------------------------------------------------------
	• Do not touch electrically live parts.						MAXIMUM INLET PRESSURE IS 100 PSI.		(6.9 BAR.)
	• Only qualified personnel should per-						Install the shielding gas supply as follows:
	form maintenance work.						1. Secure the cylinder to prevent it from falling.
-------------------------------------------------------------------------
							2. Remove the cylinder cap. Inspect the cylinder valves
Electrode Polarity		DIP switch #7 setting						and regulator for damaged threads, dirt, dust, oil or
Positive		OFF (Factory setting)						grease. Remove dust and dirt with a clean cloth. DO
Negative		ON						NOT ATTACH THE REGULATOR IF OIL, GREASE OR
								DAMAGE IS PRESENT! Inform your gas supplier of
Tools required:								this condition. Oil or grease in the presence of high
• 5/16" nut driver								pressure oxygen is explosive.
							3. Stand to one side away from the outlet and open the
To change the DIP switch from Electrode Polarity:								cylinder valve for an instant. This blows away any dust
								or dirt which may have accumulated in the valve outlet.
1. Turn power off at the welding power source							4. Attach the flow regulator to the cylinder valve and tight-
2. Remove the spool of wire from the feeder.								en the union nut(s) securely with a wrench.		Note: if
								connecting to 100% CO2 cylinder, insert regulator
3. Remove the 4 screws holding the cover. Lift the cover
out of the feeder.								adapter between regulator and cylinder		valve. If
								adapter is equipped with a plastic washer, be sure it is

4. Move DIP switch #7 on the feed head board to the		seated for connection to the CO2 cylinder.
appropriate position.
	5.	Attach one end of the inlet hose to the outlet fitting of
5. Install the cover and secure with the screws.
		the flow regulator. Attach the other end to the welding
		system shielding gas inlet. Tighten the union nuts with
		a wrench.
	6.	Before opening the cylinder valve, turn the regulator
		adjusting knob counterclockwise until the adjusting
		spring pressure is released.
	7.	Standing to one side, open the cylinder valve slowly a
		fraction of a turn. When the cylinder pressure gage
		stops moving, open the valve fully.
	8.	The flow regulator is adjustable. Adjust it to the flow rate
		recommended for the procedure and process being
		used before making a weld.

POWER FEED® 25M