Miller Electric Bobcat 250 manual Operating the Welding Generator, Front Panel Controls

. A complete Parts List is available at www.MillerWelds.com

SECTION 6 − OPERATING THE WELDING GENERATOR

6-1. Front Panel Controls

		6	3
4	5

		1		2	Ref. 228 201-B
1	Engine Control Switch	Hour Meter: With engine off, place Engine	5	Coarse Range Switch
Use switch to start engine, select speed, and		Control switch in Run/Idle position to view en-	NOTICE − Do not switch under load.
		gine hours.
stop engine. In Run/Idle position, engine runs
		Oil Change Interval: With engine off, place En-	Use switch to select weld amperage range
at idle speed at no load, and weld/power speed
under load. In Run position, engine runs at		gine Control switch in the Run position to see	when Weld Process Selector switch is in Stick/
weld/power speed.		hours before next oil change. Oil hours start at	Tig position, or voltage range when switch is in
. Place switch in Run position to operate		100 and count down to 0 (zero) (oil change	Wire position.
		due).	. For best arc starts and when using weld
	most MIG equipment.	. Negative hours indicated when past rec-
2	Engine Choke Control			and generator power together, use a low
		ommended oil change interval.		Coarse Range setting with the Fine con-
Use control to change engine air-fuel mix.
		To reset, cycle Engine Control switch from		trol set at 7 or higher.
To Start: pull out choke and turn Engine Con-		Run/Idle to Run three times within five sec-	6	Fine Control
trol switch to Start position. Release switch		onds (engine off).	Use control to select weld amperage (Stick/
and slowly push choke in when engine starts.		4 Weld Process Selector Switch
			Tig) or voltage (Wire) within the range selected
. If the engine does not start, let engine		NOTICE − Do not switch under load.	by the Coarse Range switch. Control may be
	come to a complete stop before attempt-	Use switch to select type of weld output.	adjusted while welding.
	ing restart.	Wire (GMAW) Welding: Use a positive (+)	Set control at 10 for maximum generator
. During cold weather some gasoline en-		position for Direct Current Electrode Positive	power.
	gines encounter difficulties that are easily	(DCEP) and a negative (−) position for Direct	Weld output would be about 124 A DC based
		Current Electrode Negative.
	remedied. See Section 6-2and 10-3.		on control settings shown (80% of 60 to 140
To Stop: turn Engine Control switch to Off		Stick (SMAW) and TIG (GTAW Welding): Use	A). Settings shown are typical for welding with
		a positive (+) position for Direct Current Elec-	a 7018 (1/8) electrode.
position.
		trode Positive (DCEP) and a negative (−) posi-
			. See Sections 6-3thru 6-5for typical pro-
3	Engine Hour Meter/Fuel Gauge/Idle	tion for Direct Current Electrode Negative.
	Control	Use AC position for alternating current.		cess connections and control settings.

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