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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

Page 38
Image 38
Lincoln Electric SVM204-A service manual Figure E.4 Automatic Idle System