Lincoln Electric RANGER 225 GXT Service Manual page 37

E-3
FIGURE E.3 – ROTOR FIELD FEEDBACK AND AUXILIARY POWER
C A P A C I T O R S O L E N O I D B A T T E R Y F L Y W H E E L E N G I N E P R I N T E D C I R C U I T S L I P S T A R T I G N . S W I T C H + - F I E L D R I N G S R U N R O T O R S W I T C H B O A R D P R E S S U R E S T A R T E R O I L A L T E R N A T O R M E T E R I D L E R H O U R W O R K R O T O R B R E A K E R S T O R R O I D S T A T O R A U X ( A U X & W E L D ) I D L E S E N S E 2 3 0 V O L T A U X 1 1 5 V O L T A U X E X C I T E R T E R M I N A L + C O N T R O L A U X O U P U T -
F U E L R O T A T I O N M E C H A N I C A L S O L E N O I D A C W E B R I D G E A C O U T P U T P O L A R I T Y C H O K E E L E C T R O D E S W I T C H C V T E R M I N A L + T A P S T A T O R - S W I T C H R A N G E R E A C T O R L D
SOLENOID
ENGINE
STARTER
FLYWHEEL
ALTERNATOR
OIL
PRESSURE
START
SWITCH
IGN.
RUN
SWITCH
HOUR
METER
-
+
BATTERY
ROTOR FIELD FEEDBACK AND
AUXILIARY POWER
The AC voltage developed in the field winding is fed to
the full wave field bridge. The DC output of the bridge
is filtered by the field capacitor and controlled by the
printed circuit board according to the output control set-
ting. This filtered and controlled voltage is fed to the
rotor winding via the brush and slip ring configuration.
As the feedback voltage is increased or decreased, the
outputs of the weld and auxiliary windings are
increased or decreased.
When full field voltage is applied to the rotor and the
engine is running at high speed (3700 RPM), a 230 AC
voltage is developed in the stator auxiliary winding.
This winding is tapped to provide 115 VAC. The two
voltages, (115 VAC and 230 VAC), are connected to the
appropriate receptacles and offer 9000 watts (total) of
AC power.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion
THEORY OF OPERATION
REACTOR
FUEL
MECHANICAL
ROTATION
ROTOR
SLIP
RINGS
IDLER
SOLENOID
EXCITER
FIELD
CAPACITOR
+
-
PRINTED CIRCUIT
BOARD
RANGER® 225 GXT
RANGE
SWITCH
AC
+
OUTPUT CHOKE
BRIDGE
AC
-
CV
TAP
WE LD
STATOR
ROTOR
(AUX & WELD)
STATOR
IDLE SENSE
AUX
TORROID
115 VOLT 230 VOLT
OUPUT
AUX
CONTROL
ELECTRODE
TERMINAL
POLARITY
SWITCH
WORK
TERMINAL
AUX
BREAKERS
AUX
E-3