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• ARC ESTABLISHED LED goes on when the arc
is fully established and goes out if the arc goes
out.
• START LED is on from the time the arc is estab-
lished until current begins to go up (soft start) or
down (hot start). Note that the Start LED is off
during upslope if a soft start is used.
• PEAK LED goes on after the Start period. If the
Pulse switch is on, the Peak LED goes off dur-
ing the Background periods. The Peak LED and
Background LED will alternate when pulsing.
• BACKGROUND LED is on during the
Background (low pulse) period of pulsing.
• CRATER FILL LED is on during the Fade-Out
downslope and final current periods.
NOTE: An LED will light in response to the control cir-
cuit command, even if other components do not work.
For example, if the gas supply is turned off or the gas
solenoid valve malfunctions or the fuse is blown, the
gas will not flow even though the Gas and Water LED
lights up. Another example is the High Frequency LED
which can light, yet there will not be high frequency
due to a blown fuse or defective high frequency circuit
or spark gaps set too large.
The Status Indicator LEDs are useful for understanding
which functions are active during a weld sequence
and for how long. They are useful for setting times of
the controls on the Function Panel. See Figure B.2.
The Status Indicator LED circuit board includes a
receptacle for plugging in the circuit board included
with the Optional Interface Kit.
OPERATION
B-10 B-10
SQUARE WAVE TIG 355
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