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ANALOG CONTROL POWER
SUPPLY BOARD AND WELD
CONTROL BOARD
The Analog Control Power Supply Board, which is pow-
ered by 40 VDC delivered from the DC Buss Power
Supply Board, supplies various regulated DC voltages
to operate the Weld Control Board circuitry. It also pro-
vides two regulated 20 VDC supplies to operate the
electronics on the Chopper Module Boards and applies
a 15 VDC supply to the Peripheral Board.
The Weld Control Board monitors the operator controls
(arc control, output control, hot start control, mode
selector switch, CC Slope switch and the remote con-
trol receptacle). It compares these commands to the
current and voltage feedback information it receives
from the shunt and output terminal circuits. The cir-
cuitry on the Weld Control Board determines how the
output should be controlled to optimize welding results,
and it sends the correct PWM gate signals to the IGBT
driver circuits. The Weld Control Board commands the
voltmeter and ammeter, which display both preset and
actual (while welding) voltage and current. The Weld
Control Board also controls the cooling fan motor and
the thermal indicator (light).
E-4 E-4
THEORY OF OPERATION
MULTI-WELD 350
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
CHOKE
IGBT
IGBT
SHUNT
WORK
TO ELECTRODE
CABLE
+
ANALOG
CONTROL
POWER
SUPPLY
BOARD
WELD
CONTROL
BOARD
ARC
FORCE
CONTROL
OUTPUT
CONTROL
HOT
START
DC
BUS
POWER
SUPPLY
BOARD
FAN
+
DC
POWER
SOURCE
(EXTERNAL)
_
REMOTE
RECEPTACLE
INPUT
DIODES
INPUT
CONTACTOR
MULTI-WELD 350 BLOCK LOGIC DIAGRAM
CC SLOPE
(STICK/GOUGE or PIPE)
PERIPHERAL
BOARD
INPUT
INDICATOR
LIGHT
ON/OFF
MODE
SWITCH
(1/2)
CR1
CHOPPER MODULE
CHOPPER MODULE
ON/OFF
MODE
SWITCH
(1/2)
VOLTS
AMPS
THERMAL
LIGHT
FREEWHEELING DIODE
FREEWHEELING DIODE
REGULATED
VOLTAGES
CR1
COIL
15 VDC
CURRENT FEEDBACK
TO WELD CONTROL BOARD
20
VDC
x 2
-
INPUT
CAPACITORS
40
VDC
LEFT AND RIGHT
CHOPPER MODULES
GATE
SIGNALS
40 VDC
FIGURE E-4 – ANALOG CONTROL POWER SUPPLY BOARD AND WELD CONTROL BOARD