Lincoln Electric SVM204-A Generating Power, DC Weld Output, Weld Output Control, Weld Boost

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E-6 THEORY OF OPERATION E-6

FIGURE E.6 - GENERATING POWER

							CURRENT	120 VAC RECEPTACLES		240 VAC
							SENSOR
									RECEPTACLE
		OIL LEVEL						CB1	CB3
OIL		INDICATOR
LEVEL								CB2	CB4
MODULE
(KOHLER)							REACTOR
		OIL LEVEL			AUXIIARY WINDINGS
		SWITCH		RINGS		STATOR
				SLIP						+
				_ +		WELD		OUTPUT	CHOKE
										OUTPUT
		IGNITION	ENGINE		ROTOR	WINDINGS		RECTIFIER
										STUDS
								(2 PHASE)
					BRUSHES
		STARTER /	ALTERNATOR	IDLE	EXCITER
		SOLENOID		SOLENOID	WINDING
		10 AMP						BOOST
								WINDING
		FUSE
		OFFAUTO
_	+	HIGH
		START
BATTERY				ENGINE
				SHUTDOWN
				RELAY				OUTPUT
						AUTOMATIC	OUTPUT	CONTROL
						IDLER	CONTROL CIRCUIT
						CIRCUIT
			HOUR
			METER		FIELD / CONTROL PC BOARD

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GENERATING POWER (continued)

DC Weld Output

AC output from the two phase-shifted weld windings pass through a reactor then to a two-phase bridge rec- tifier. DC output from the rectifier is then stabilized by a choke and terminates at two weld output terminals.

Weld Output Control

Weld output is controlled by varying the current in the rotating field winding. This is done through circuitry on the PC board that detects the position of the output control potentiometer and then limits the rotor current accordingly.

NOTE: Because the strength of the rotating field affects the output of all the windings, auxiliary output will also drop when the weld output control setting is decreased.

Weld Boost:

The Outback® 185 is equipped with a weld boost cir- cuit that improves weld performance. The reactor con- tains a weld boost winding that produces output rela- tive to the weld current. In high welding load situations, the exciter winding will tend to drop off in output while the boost winding’s output tends to increase. The out- put from this boost winding is routed through a circuit breaker. It is then rectified and added to the exciter cir- cuit, resulting in a significant improvement in weld per- formance.

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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion

OUTBACK® 185