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THEORY OF OPERATION
E-2 E-2
CLASSIC® 300D & 300G
GENERAL DESCRIPTION
The Classic® 300 welding machines are heavy duty,
engine driven DC arc welding power sources capable
of providing constant current output for stick welding or
DC TIG welding. Also, a total of 3000 watts of auxiliary
power is available at the 115 or 230VAC receptacles.
The Classic® 300 is manufactured with all copper
windings.
FIGURE E.1 - GENERAL DESCRIPTION (Classic® 300G, Zenith Fuel System/GM Engine)
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
+
-
Z
ENITH
E
.C.U.
BATTERY
STARTER
MOTOR
START
A
MMETER
IGNITION
SWITCH
ENGINE
ALTERNATOR
ENGINE FAILURE LAMP
HOUR METER
FUEL PUMP
I
DLE
SWITCH
ENGINE
RPM CONTROL
GASOLINE
ENGINE
ENGINE
CONTROL
C
OMPONENTS
AND
SENSORS
NEGATIVE
O
UTPUT
TERMINAL
P
OSITIVE
O
UTPUT
TERMINAL
CURRENT
S
ENSOR
P.C. BOARD
115 & 230VAC
RECEPTACLES
SELECTOR
SWITCH
G
ENERATOR
F
RAME
ALTERNATOR STATOR
ROTATOR
FIELD
R
ECTIFIER
G
ENERATOR
F
IELD CONTROL
RHEOSTAT
FLASHING
S
LIP
RINGS
ARMATURE
S
HAFT
S
ERIES
COILS
FIELD
SHUNT
W
INDINGS
RESIDUAL
M
AGNETISM
I
NTERPOLE
COILS
GENERATOR
ARMATURE
M
ECHANICAL
COUPLING
BRUSHES
&
COMMUTATOR
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