Lincoln Electric COMMANDER SVM145-B Service Manual page 49

Section E-1
-THEORY OF OPERATION SECTION-
Theory of Operation .............................................................................................................Section E
General Description ..............................................................................................................E-2
Battery, Engine, Rotor, Stator and Engine Protection ...........................................................E-2
Weld Windings, Rectifier, Power Modules and Feedback.....................................................E-3
Control Transformer and Control Board ...............................................................................E-4
Insulated Gate Bipolar Transistor (IGBT) Operation .............................................................E-5
Pulse Width Modulation .........................................................................................................E-6
Chopper Technology Fundamentals ......................................................................................E-7
ENGINE
STARTER
ALTERNATOR
ENGINE
SENSORS
BATTERY
ENGINE
PROTECTION
TABLE OF CONTENTS
D
L
E
W
MECHANICAL
ROTATION
SLIP
RINGS
STATOR
AUXILIARY
SOL
1
1
I
5
D
SOL
V
L
S A
E
H C
R
U
T
D
O
W
N
CONTROL
TRANSFORMER
FIGURE E.1 – Commander 300 BLOCK LOGIC DIAGRAM
COMMANDER 300
TO
CONTROL
BOARD
THREE-PHASE
RECTIFIER
W
I
N
D
I
N
G
CONTROL
BOARD
ROTOR
ARC OUTPUT
CONTROL CONTROL
WINDINGS
230VAC
RECEPTACLE
115VAC
RECEPTACLE
42VAC
30VAC
30VAC
Section E-1
WORK
TERMINAL
__
SHUNT
TO
CONTROL
BOARD
POWER MODULES
(TWO)
ELECTRODE
IGBT
TERMINAL
CHOKE
+
IGBT
MODE
SELECTOR