Control Board - Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual

E-7
THREE
PHASE
INPUT
POWER
INPUT
LINE
SWITCH
PROTECTION
BOARD

CONTROL BOARD

The Control Board is at the heart of controlling the out-
put of the machine. With the information it receives
from the Shunt (current feedback), the voltage sensing
leads, the wire feeder(s), and the other printed circuit
boards, the Control Board optimizes the welding
results by regulating the FETs' switching times, which
in turn control the output of the machine. The Control
Board also monitors the thermal protection devices
and the regulation and fault signals produced on the
Protection Board.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
THEORY OF OPERATION
FIGURE E.7 – CONTROL BOARD
INPUT
RECTIFIER
INPUT AND
CONTACTOR RECONNECT
LEFT
SWITCH
BOARD
FET
ASSEMBLY
AUX.
TRANS
RIGHT
SWITCH
BOARD
FAN
FET
ASSEMBLY
POWER
BOARD
WATER
COOLER
PC
INTERFACE
POWER WAVE 450
MAIN OUTPUT
TRAMSFORMER
RECTIFIER
CT
SNUBBER
SENSE LEADS
CONTROL
BOARD
LCD
DISPLAY
DISPLAY
BOARD
KEYPAD
OVERLAY
WF1 WF2
E-7
CHOKE POSITIVE
NEGATIVE
SHUNT
AND