Welder Operation, Duty Cycle | Lincoln Electric 200

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B-3			OPERATION		B-3
Larger machines with a capacity of 350 amperes and				DUTY CYCLE
higher, which are operated at low or no-load conditions				The NEMA output rating of the PIPELINER® 200D
for extended periods of time are especially susceptible
to the conditions described above. To accomplish suc-				KUBOTA is 200 amperes at 28 arc volts on a 60% duty
cessful engine break-in, most diesel-powered equip-				cycle (consult Specifications in this manual for alternate
ment needs only to be run at a reasonably heavy load				ratings). Duty cycle is based on a ten minute period;
within the rating of the welder for some period of time				thus, the welder can be loaded at rated output for six
during the engineʼs early life. However, if the welder is				minutes out of every ten minute period.
subjected to extensive light loading, occasional moder-
ate to heavy loading of the engine may sometimes be				CONTROL OF WELDING CURRENT
necessary. Caution must be observed in correctly
loading a diesel/generator unit.					CAUTION
1. Connect the welder output studs to a suitable				DO NOT TURN THE “CURRENT RANGE SELEC-
	resistive load bank. Note that any attempt to short			TOR” WHILE WELDING because the current may
	the output studs by connecting the welding leads			arc between the contacts and damage the switch.
	together, direct shorting of the output studs, or			------------------------------------------------------------------------
	connecting the output leads to a length of steel will
	result in catastrophic damage to the generator and			The “Current Range Selector” provides five overlap-
	voids the warranty.			ping current ranges. The “Fine Current Adjustment”
2. Set the welder controls for an output current and				adjusts the current from minimum to maximum within
	voltage within the welder rating and duty cycle.			each range. Open circuit voltage is also controlled by
	Note that any attempt to exceed the welder rating			the “Fine Current Adjustment” permitting control of the
	or duty cycle for any period of time will result in			arc characteristics.
	catastrophic damage to the generator and voids
	the warranty.			A high open circuit voltage setting provides the soft
3. Periodically shut off the engine and check the				“buttering” arc with best resistance to pop-outs pre-
	crankcase oil level.			ferred for most welding. To get this characteristic, set
				the “Current Range Selector” to the lowest setting that
WELDER OPERATION				still provides the current you need and set the “Fine
				obtain 175 amps and a soft arc, set the “Current
			WARNING	Current Adjustment” near maximum. For example: to
				Range Selector” to the 190-120 position and then
		ELECTRIC SHOCK can kill.		adjust the “Fine Current Adjustment” for 175 amps.
		•	Do not touch electrically live parts or	When a forceful “digging” arc is required, usually for
		•	electrode with skin or wet clothing.	vertical and overhead welding, use a higher “Current
			Insulate yourself from work and	Range Selector” setting and lower open circuit voltage.
			ground.	For example:	to obtain 175 amps and a forceful arc,
		FUMES & GASES can be dangerous.		set the “Current Range Selector” to the 240-160 posi-
		• Keep your head out of the fumes.		tion and the “Fine Current Adjustment” setting to get
		• Use ventilation or exhaust to remove		175 amps.
			fumes from breathing zone.	Some arc instability may be experienced with EXX10
		WELDING SPARKS can cause fire or		electrodes when trying to operate with long arc tech-
				niques at settings at the lower end of the open circuit
		explosion.		voltage range.	CAUTION

		• Keep flammable material away.
		ARC RAYS can burn.		DO NOT attempt to set the “Current Range Selector”
				between the five points designated on the nameplate.

		• Wear eye, ear, and body protection.		------------------------------------------------------------------------
------------------------------------------------------------------------				These switches have a spring loaded cam which
				almost eliminates the possibility of setting this switch
				between the designated points.

PIPELINER® 200D KUBOTA

Lincoln Electric 200 service manual Welder Operation, Duty Cycle, Control of Welding Current

Models: 200

OPERATION

DUTY CYCLE

CONTROL OF WELDING CURRENT

DO NOT TURN THE “CURRENT RANGE SELEC-

arc between the contacts and damage the switch.

WELDER OPERATION

voltage range.