Theory of operation, General description, Engine – Lincoln Electric CLASSIC I SVM134-A User Manual
Page 40
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.
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.
THEORY OF OPERATION
E-2
E-2
CLASSIC I
FIGURE E.2 – BATTERY, STARTER, ENGINE ALTERNATOR AND OIL SWITCH CIRCUIT
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
NEGATIVE
OUTPUT
TERMINAL
POSITIVE
OUTPUT
TERMINAL
RESIDUAL
MAGNETISM
ARMATURE
SHAFT
GENERATOR
ARMATURE
BRUSHES
&
COMMUTATOR
GENERATOR
FRAME
SERIES
COILS
INTERPOLE
COILS
SHUNT
WINDINGS
GENERATOR
FIELD CONTROL
FIELD
MECHANICAL
COUPLING
REED
RELAY
CR2
SELECTOR
SWITCH
IDLER
BOARD
IDLER
SOLENOID
OIL
PRESSURE
ENGINE
ALTERNATOR
STARTER
MOTOR
BATTERY
ENGINE
IGNITION
SWITCH
SWITCH
ENGINE
HOUR
METER
OIL
PRESSURE
LIGHT
115 VDC
RECEPTACLE
FUEL
SHUTDOWN
ENGINE
IGNITION
SHUNT
FIELD
SERIES
FIELD
ARMATURE
EXCITER
DC