Lincoln Electric BIG RED 500 Service Manual page 69

E-1
TABLE OF CONTENTS-THEORY OF OPERATION SECTION
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2
Battery, Run/Stop Switch, Starter, Engine Alternator, And Engine Shutdown Circuits . . . . . . . . . . . . . . . .E-3
Auxiliary Rotor, Auxiliary Stator And Excitation (Flashing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4
Weld Rotor, Weld Stator, Selector Switch And Field Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5
Tapped Reactor And Three-Phase Rectifier Bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-6
Engine Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-7
Battery Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-7
FUEL
SOLENOID
OIL
TEMP.
ENGINE
ENGINE
SWITCH
+ +
SHUTDOWN
PROTECTION
RELAY
LIGHT
OIL
TIME
PRESSURE
DELAY
SWITCH
RELAY
RUN / STOP
SWITCH
FIGURE E.1 BLOCK LOGIC DIAGRAM
TO
HOT START
RELAY
OIL
OIL
FUEL
TEMP.
PRESSURE
SENSOR
SENSOR
SENSOR AND
AND
AND
GAUGE
GAUGE
GAUGE
MECHANICAL
COUPLING
DIESEL
ENGINE
STARTER
ENGINE
SOLENOID
ALTERNATOR
START
BUTTON
12 VDC
BATTERY
BIG RED
THREE PHASE
RECTIFIER
+
TAPPED
REACTOR
SELECTOR
SWITCH
AUXILIARY
STATOR
65 VAC
ROTOR
SHAFT
AUXILIARY
WELD
ROTOR
ROTOR
WELD
STATOR
FIELD
RECTIFIER
FINE
CURRENT
CONTROL
PART OF
STICK/TIG
115/230 VAC
SWITCH
RECEPTACLES
TO
HOT
TAPPED
START
REACTOR
RELAY
12 VDC
® 500/600
HOT
START
CIRCUIT
PART OF
STICK/TIG
SWITCH
65 VAC
150 VAC
FIELD
FEEDBACK
AUXILIARY
ROTOR
FLASHING
CIRCUIT
E-1
+