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THEORY OF OPERATION
E-4 E-4
VANTAGE® 400
FIGURE E.4 — WELD CONTROL BOARD
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
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
WELD CONTROL BOARD
The 80 VDC derived from the filter capacitors on the
Power Modules, supplies various regulated DC volt-
ages to operate the Weld Control PC board circuitry. It
also supplies two regulated DC voltages to operate the
IGBT driver circuitry on the two Power Modules.
The Weld Control PC board monitors the operator con-
trols (arc control, output, and process/range selector).
It compares these commands to the current and volt-
age feedback information it receives from the shunt
and output terminal circuits. The circuitry on the Weld
Control PC board determines how the output should be
controlled to optimize welding results, and it sends the
correct PWM signals to the IGBT driver circuits. The
Weld Control PC board also commands the thermal
light and the voltmeter and ammeter (some items may
be optional).
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