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

E-9
THREE
PHASE
INPUT
POWER
INPUT
LINE
SWITCH
PROTECTION
BOARD

DISPLAY BOARD

The Display Board allows the operator to select from
the procedures that are programmed into the
machine, and it lets the Control Board know which
procedure was selected. These procedures are pro-
grammed into the machine's software package. The
Display Board is used to communicate with the oper-
ator. It determines what Overlay is installed in the
machine and which buttons are active on the keypad.
It also controls the LCD display, the lights on the front
of the machine, the Piezo Buzzer and the water cool-
er. Through the use of a current serial loop, the
Display Board and Control Board communicate (or
talk) to the wire feeder(s). The Display Board can also
communicate with a computer through the RS232
interface.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
THEORY OF OPERATION
FIGURE E.9 – DISPLAY 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-9
CHOKE POSITIVE
NEGATIVE
SHUNT
AND