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TABLE OF CONTENTS-THEORY OF OPERATION SECTION
E-1 E-1
VANTAGE® 400
FIGURE E.1 — VANTAGE® 400 BLOCK LOGIC DIAGRAM.
W
E
L
D
W
I
N
D
I
N
G
30
AUXILIARY
WINDINGS
10 + 30
ROTOR
+
REMOTE
AMPHENOL
ARC
CONTROL
OUTPUT
CONTROL
PROCESS/RANGE
SELECTOR
WELD
CONTROL
BOARD
THREE-PHASE
RECTIFIER
WORK
TERMINAL
ELECTRODE
TERMINAL
CHOPPER MODULE
IGBT
CHOKE
VOLTMETER
AMMETER
PWM
SIGNAL
VRD
VOLTAGE REDUCTION
VRD FEEDBACK
VRD
LIGHTS
R
G
VRD
SWITCH
(OFF)
SHUNT
AUX. FEEDBACK
120VAC
RECEPTACLED (2)
AUX
CURRENT
TORROID
42 VAC TO 14 PIN AMPHENOL
FOR WIRE FEEDER
240 VAC
30
240VAC
RECEPTACLE
LOW IDLE COMMAND
F
E
E
D
B
A
C
K
C
U
R
R
E
N
T
I
D
L
E
V.R.D.
POWER TO CONTROL BOARD
POWER TO
VRD
80 VDC
VOLT
FEEDBACK
+
-
ENGINE
GLOW PLUGS
MECHANICAL
ROTATION
STARTER
ALTERNATOR
BATTERY
OIL PRESS
TEMP
ROTOR
FLASH
ENGINE PROTECTION
IDLER CONTROL
P.C. BOARD
STATOR
SLIP
RINGS
+
-
RUN/STOP
SWITCH (RUN)
ENGINE
SENSORS
ENGINE
TROUBLE
LIGHT
Y
ALT
SOL SOL
ALT FLASH
S
H
U
T
D
O
W
N
I
D
L
E
R
+
-
Y
ALTERNATOR
LIGHT
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2
Battery, Starter, Engine, Rotor, Stator, Engine Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2
Weld Windings, Rectifier, Chopper Modules and Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3
Weld Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4
Insulated Gate Bipolar Transistor (IGBT) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5
Pulse Width Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-6
Chopper Technology Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-7
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