Lincoln Electric SP-250 Connect Output Components, GUN Liner & Contact TIP Installation

		A-7	INSTALLATION		A-7
TOC	TOC	CONNECT OUTPUT COMPONENTS		GUN LINER & CONTACT TIP
				INSTALLATION
Section	Master
		INSTALL THE WORK CLAMP		The Magnum 250 SP gun and cable provided with the
to	to	Attach the work clamp to the cable which extends from		SP-250 is factory installed with a liner for a .035” or
		the front of the machine using the following procedure:		.045” (0.9 or 1.2mm) diameter electrode and an .035
Return	Return
				(0.9mm) contact tip.
		1. Insert the lug on the end of the work cable through		1. If a .045” diameter wire size is to be used, install
			the strain relief hole in the work clamp handle. See
			Figure A.7.	the .045” contact tip (also provided).
		2. Slide the work cable through the hole up to the bolt		2. For other wire sizes, use the following procedure
			and nut.	for contact tip and gas nozzle installation. See
				Figure A.8.

3. Fasten work cable using the bolt and nut provided.

		a.	Choose the correct size contact tip for the
TOC	TOC		electrode being used (wire size is stenciled on
			the side of the contact tip) and screw it snugly
Section	Master		into the gas diffuser.
		b.	Be sure the nozzle insulator is fully screwed
to	to		onto the gun tube and does not block the gas
			holes in the diffuser.
Return	Return
		c.	Slip the appropriate gas nozzle onto the noz-
			zle insulator. Either a standard .50" (12.7mm)
			or optional .62” (15.9mm) I.D. slip on gas noz-
			zle may be used and should be selected
			based on the welding application.

FIGURE A.7 - Installing The Work Clamp

d. Adjust the gas nozzle for the GMAW process to be used.

TOC	TOC	OUTPUT POLARITY CONNECTION		For the short-circuiting transfer process,	the contact
Section	Master		WARNING	tip end should be flush to extended to .12" (3.2mm)
		WARNING: TURN THE WELDER POWER SWITCH		For the spray transfer process, the contact tip should
				be flush to recessed .12" (3.2mm).
to	to	OFF BEFORE CHANGING OUTPUT CONNECTION.
		____________________________________
Return	Return
		The welder is shipped from the factory connected for
		electrode positive (+) polarity. This is the normal polar-
		ity for GMA welding.
		If negative (-) polarity is required, interchange the con-
		nection of the two cables located in the wire drive com-
		partment near the front panel. The negative lead is the
		lead closest to the front panel (where the leads come
TOC	TOC	out of the floor of the compartment) and should be
		reconnected to the brass conductor tube of the gun
Sectionto	Masterto	connector. The positive lead is stamped (+) on its ter-
		minal and should be reconnected to the work lead ter-
		minal.
Return	Return			FIGURE A.8 - Contact Tip and	Electrode
				Connections
			IDEALARC SP-250