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Lincoln Electric SVM150-A User Manual Page 43

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Section E-1 Section E-1
RANGER 250
Theory of Operation .............................................................................................................Section E
General Description ..............................................................................................................E-2
Battery, Engine, Rotor, Stator and Engine Protection ...........................................................E-2
Weld Windings, Rectifier, Power Module and Feedback.......................................................E-3
Analog Power Board and Control Board ...............................................................................E-4
Insulated Gate Bipolar Transistor (IGBT) Operation .............................................................E-5
Pulse Width Modulation.........................................................................................................E-6
Chopper Technology Fundamentals......................................................................................E-7
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
FIGURE E.1 – RANGER 250 BLOCK LOGIC DIAGRAM
ENGINE
CONTROL
BOARD
ROTOR
STATOR
BATTERY
BOARD
BATTERY
CHOKE
IGBT
MECHANICAL
RO TATI ON
STARTER
I
D
L
E
R
ARC
CONTROL
OUTPUT
CONTROL
MODE
SELECTOR
POWER MODULE
THREE-PHASE
RECTIFIER
WORK
TERMINAL
ELECTRODE
TERMINAL
+
120VAC
RECEPTACLE
240VAC
RECEPTACLE
SLIP
RINGS
TO
CONTROL
BOARD
GAS
OIL
PRESSURE
SWITCH
RUN/STOP
SWITCH
FLYWHEEL
ALTERNATOR
TO CONTROL
BOARD
AMPHENOL
4
2
V
A
C
FIELD
WINDING
AUXILIARY
WINDINGS
WIRE FEED
PWR WNDG
4
2
V
A
C
2
4
0
V
A
C
1
2
0
V
A
C
W
E
L
D W
I
N
D
I
N
G
+
ANALOG
POWER
BOARD
2
0
V
D
C
4
0
TO
1
0
0
V
D
C
FROM
TOROID
CURRENT
SENSOR
SHUNT
F
E
E
D
B
A
C
K
SOL
____
REGULATED VOLTAGES
P
W
M
S
I
G
N
A
L
S
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