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ENGINE, MAIN GENERATOR
ARMATURE AND FRAME AND DC
EXCITER
EXCITATION (FLASHING)
The main generator armature and the exciter arma-
ture are mechanically coupled to the engine. When
the engine is started and running, the residual mag-
netism that is stored in the exciter pole pieces is
induced upon the exciter armature. This causes the
exciter to "build-up" and produce a DC output volt-
age. This DC voltage is applied, via the field rheostat
control, to the main generator shunt field coils. The
exciter output is also connected to the 115VDC recep-
tacle.
MAIN SHUNT, INTERPOLE AND SERIES
COILS
The generator armature rotates within the magnetic
field created by the shunt field windings. A DC voltage
is induced in the armature and is transferred, through
the armature commutator and brushes, to the series
and interpole coils. The interpole coils, which are con-
nected in series with the positive output terminal, are
located so as to counteract any magnetic influences
that could cause mechanical distortion in the rotating
armature. The series coils are designed to oppose or
"buck" the DC voltage that is generated in the arma-
ture.
THEORY OF OPERATION
E-3 E-3
CLASSIC I
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.3 – ENGINE, MAIN GENERATOR ARMATURE AND FRAME AND DC EXCITER
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
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