Lincoln Electric SVM204-A service manual Figure E.4 Automatic Idle System

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E-4 THEORY OF OPERATION E-4

FIGURE E.4 - AUTOMATIC IDLE SYSTEM

							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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AUTOMATIC IDLE SYSTEM

The Outback® 185 is equipped with an automatic engine idle system. A solenoid is used to pull the engine throttle to a preset low speed position when 12 volts DC is applied. When no voltage is applied, the solenoid is released allowing the engine governor to control the RPM.

The “high” and “auto” positions on the rotary run/stop/idle switch control the supply of positive (+) battery voltage to the idle solenoid. When the switch is in the “high” position, the solenoid is shut off and the engine will remain in high idle. When the switch is in the “auto” position, positive (+) battery voltage is applied to the solenoid and the negative (-) connection is controlled by the PC board as described below.

The following explanation assumes that the rotary switch is in the “auto” position and the engine is oper- ating at low RPM.

Weld and auxiliary current are detected by a toroidal current sensor that is connected to the PC board. When sufficient current flows through the sensor; the PC board detects this and immediately interrupts the negative (-) connection to the solenoid. The solenoid is released and the engine RPM increases to the high setting. When the current flow stops, the PC board will begin a time delay of about 12 seconds. If the current flow begins again during this time delay, the solenoid remains inactive and the engine continues to operate at high RPM. If no current flow is detected at the end of the 12 second delay, the negative (-) connection to the solenoid is restored and the engine will drop to low idle RPM.

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

OUTBACK® 185