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Section E-1 Section E-1
SA-250
Theory of Operation .............................................................................................................Section E
General Description...............................................................................................................E-2
Battery, Starter, Engine Alternator, and Protection Circuits ..................................................E-2
Engine, Generator Armature and Frame, Alternator Stator and Rotor..................................E-3
Excitation (Flashing)........................................................................................................E-3
Auxiliary and Field Feedback Coils.................................................................................E-3
Interpole and Series Coils...............................................................................................E-4
Current Range Selector ..................................................................................................E-4
Fine Current Adjustment .................................................................................................E-4
Engine Idler Circuit..........................................................................................................E-4
DC Generator Machines........................................................................................................E-5
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
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
TEMPERATURE
FUEL
ENGINE
ALTERNATOR
STARTER
MOTOR
BATTERY
ENGINE
PROTECTION
RELAY
IGNITION
SWITCH
INJECTION
PUMP
GAUGE
SWITCH
FIGURE E.1 – SA-250 BLOCK LOGIC DIAGRAM