Lincoln Electric SVM175-A service manual Connection of the LN-742 to Ranger 305D See Figure C.7

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C-9			ACCESSORIES			C-9
	CONNECTION OF THE LN-742 TO THE
	RANGER 305D.				CAUTION
	(SEE FIGURE C.7.)			An
					increase of the high idle engine	RPM by changing
1.		Shut the welder off.		the governor setting or overriding the throttle linkage
				will cause an increase in the AC auxiliary voltage. If
2.		Connect the electrode cable from the LN-742		this voltage goes over 140 volts, wire feeder control cir-
				cuit may be damaged. The engine governor setting is
		to the “+” terminal of the welder. Connect the work		preset at the factory - do not adjust above RPM speci-
		cable to the “-” terminal of the welder.		fications listed in this manual.
	NOTE: Figure C.7 shows the electrode connected for			------------------------------------------------------------------------
	positive polarity. To change polarity, shut the welder
	off and reverse the electrode and work cables at the			7.	Place the “WELD TERMINALS” switch in the
	output terminals.
	NOTE: Welding cable must be sized for current and				“REMOTELY CONTROLLED” position.
				8.	Adjust wire feed speed and voltage at the LN-742..
	duty cycle of application.
3.		Connect the K619 Control Cable to the 14-pin		9.	Set the ARC control to “0” initially and adjust to
		amphenol on the Ranger 305D and the input cable			suit.
4.		plug on the LN-742..
		Set the “VOLTMETER” switch to “+” or “-” depend-
5.		ing on the polarity chosen.
		Set the “MODE” switch to “CV-WIRE” position.
6.		Place the “IDLER” switch in the “AUTO” or “HIGH”
		position, as desired.

FIGURE C.7 - Ranger 305D/LN-742 CONNECTION DIAGRAM

14-PIN			TO LN-742 INPUT
AMPHENOL
+	-		CABLE PLUG
			K619 CONTROL CABLE
			ELECTRODE CABLE
		TO WORK	TO WIRE FEED UNIT

RANGER 305D