Theory Of Operation; General Description; Battery, Starter, Engine Alternator And Oil Switch Circuit - Lincoln Electric CLASSIC I SVM134-A Service Manual

E-2
FIGURE E.2 – BATTERY, STARTER, ENGINE ALTERNATOR AND OIL SWITCH CIRCUIT
ENGINE
HOUR
METER
FUEL
SHUTDOWN
ENGINE
IGNITION
IGNITION
ENGINE
SWITCH
ALTERNATOR
BATTERY

GENERAL DESCRIPTION

The Classic I is a heavy duty, engine driven, DC arc
welding power source capable of providing constant
current output for stick welding or DC TIG welding.
Also, a total of 1750 watts of auxiliary power is available
at the 115VDC receptacle. The Classic I is manufac-
tured with all copper windings.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

THEORY OF OPERATION

IDLER
BOARD
OIL
PRESSURE
LIGHT
IDLER
SOLENOID
OIL
PRESSURE
SWITCH
SERIES
COILS
ENGINE GENERATOR
MECHANICAL
ARMATURE
COUPLING
INTERPOLE
COILS
STARTER
MOTOR
CLASSIC I
SELECTOR
SWITCH
REED
RELAY
CR2
GENERATOR
FRAME
RESIDUAL
MAGNETISM
SHUNT
FIELD
DC
ARMATURE
EXCITER
SHAFT
ARMATURE
SERIES
FIELD
FIELD
SHUNT
WINDINGS
GENERATOR
FIELD CONTROL
BATTERY, STARTER, ENGINE
ALTERNATOR AND OIL SWITCH
CIRCUIT
The 12VDC battery powers the starter motor and,
through the ignition switch, the engine ignition and fuel
shutoff solenoid. The engine alternator supplies
"charging" current for the battery circuit. If the oil pres-
sure switch does not close, due to low oil pressure or
inadequate oil supply, the oil pressure light will not
glow, the hour meter will not operate and the engine
alternator will not function.
E-2
NEGATIVE
OUTPUT
TERMINAL
115 VDC
RECEPTACLE
POSITIVE
OUTPUT
TERMINAL