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Theory of Operation..............................................................................................................Section E
General Description ..............................................................................................................E-2
Battery, Engine, Rotor, Stator and Engine Protection ...........................................................E-2
Engine Idle System................................................................................................................E-3
Generating Power..................................................................................................................E-4
Weld Power and Control........................................................................................................E-5
Remote Output Control, Output Contactor, Digital Meters ....................................................E-6
Chopper Technology Fundamentals......................................................................................E-7
Pulse Width Modulation.........................................................................................................E-8
Insulated Gate Bipolar Transistor (IGBT) Operation .............................................................E-8
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Section E-1 Section E-1
RANGER 305D
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
FIGURE E.1 – RANGER 305D BLOCK LOGIC DIAGRAM
ROTOR
ENGINE
PROTECTION
CIRCUIT
ENGINE
PROTECTION
LIGHT
RUN
STOP
SWITCH
GLOW
PLUG
BUTTON
12V.
BATTERY
STARTER
ENGINE
ENGINE
SENSORS
GLOW
PLUGS
ENGINE
ALTERNATOR
START
BUTTON
IDLE
SOLENOID
PULL
COIL
HOLD
COIL
FUEL
PUMP
FUEL
SOLENIOD
PULL COIL
PULL COIL
PC BOARD
CHARGING
SYSTEM LIGHT
(CODE 10926 ONLY)
WELD
WINDING
STATOR
EXCITER
WINDING
120/240 VAC
AUX.WINDING
42 VAC
WINDING
240
VAC
CURRENT
SENSOR
14
PIN
120
vac
FLASHING
RECEPTACLES
HOLD COIL
6
PIN
AMPHENALS
OUTPUT
CONTROL
ARC
CONTROL
MODE
SWITCH
WELDING
TERMINAL
SWITCH
IDLE
SWITCH
AMP
DISPLAY
VOLT
DISPLAY
WELD CONTROL
P.C. BOARD
POWER
MODULE
IGBTs
SHUNT
+
CHOKE
-