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GENERAL DESCRIPTION
The Classic II 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 3000 watts of auxiliary power is avail-
able at the 115 or 230VAC receptacles. The Classic II
is manufactured with all copper windings.
BATTERY, STARTER, ENGINE,
ALTERNATOR, AND PROTECTION
CIRCUITS
The 12VDC battery powers the starter motor and,
through the ignition switch, the engine protection cir-
cuitry. In the event of a low oil pressure or a high oil
temperature condition, the engine protection system
shuts the engine off. The protection relay monitors the
oil pressure sensor and the oil temperature sensor. If
either sensor “ faults,” the protection relay deactivates
the fuel solenoid and the engine shuts down.
The engine alternator supplies “charging” current for
the battery circuit. If the alternator would cease to func-
tion correctly, due to a broken fan belt or other mal-
function, the CR1 relay would activate, causing the pro-
tection relay to close the fuel solenoid and shut off the
engine.
THEORY OF OPERATION
E-2 E-2
CLASSIC II
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FIGURE E.2 – BATTERY, STARTER, ENGINE ALTERNATOR, AND PROTECTION CIRCUITS
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
NEGATIVE
OUTPUT
TERMINAL
POSITIVE
OUTPUT
TERMINAL
115 & 230VAC
RECEPTACLES
CURRENT
TRANSFORMER
FIELD
RECTIFIER
FLASHING
RESIDUAL
MAGNETISM
ALTERNATOR STATOR
ROTOR
SLIP
RINGS
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
SENSOR
OIL
TEMPERATURE
SENSOR
FUEL
SOLENOID
RELAY
CR1
ENGINE
ALTERNATOR
STARTER
MOTOR
BATTERY
ENGINE
PROTECTION
RELAY
IGNITION
SWITCH
ON LATER MODELS
PROTECTION AND IDLER CIRCUITS
ARE ON ONE PC BOARD
(NOT PRESENT
ON LATER MODELS)