THEORY OF OPERATION
DISPLAY BOARD
The Display Board provides information to the user
through digital displays and LED’s. The Display Board
communicates with the Feed Head Board via the SPI
Bus cable.
The wire feed speed display shows the rate that the
LN-15 will feed wire during the welding process. The
wire feed speed is calibrated to within +/-2%. It
always displays the preset WFS.
The arc voltage display shows the average actual arc
voltage during the welding process. When welding
ceases the average arc voltage will continue to be
shown for 5 seconds. When not welding the display
show “----“. The voltage is calibrated to +/-2% over a
range of 10 to 45VDC. A negative “-“ will be automat-
ically displayed when the LN-15 is configured for elec-
trode negative processes.
All of the LEDs will briefly light when the machine is
first turned on.
E-5 E-5
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FIGURE E.5 – DISPLAY BOARD
