Lincoln Electric CITOTIG 315DC Service Manual page 12

turned OFF.
After the arc is turned OFF, the gas valve will
remain open to continue the flow of the shielding
gas to the hot electrode and work piece.
As shown above, it is possible to press and hold the
TIG torch trigger a second time during downslope to
end the downslope function and maintain the output
current at the Crater current. When the TIG torch trigger
is released the output will turn OFF and the postflow
time will start. This operation sequence, 2-step with
restart disabled, is the default setting from the factory.
2-Step Trigger Sequence with Restart Option
To select 2-Step with restart sequence:
Action
+
See "Setup menu" section below
then:
Press several times until the LED above lights up
If the 2-step restart option is enabled from the
setup menu the following sequence will occur:
Press and hold the TIG torch trigger to start
the sequence as described above.
Release the TIG torch trigger to start the downslope.
During this time press and hold the TIG torch trigger to
restart welding. The output current will increase again
at a controlled rate until the Welding current is
reached. This sequence can be repeated as many
times as necessary. When the welding is complete
release the TIG torch trigger. When the Crater current
is reached the output of the
4-Step Trigger Sequence
To select 4-Step sequence:
With the 4-step trigger mode and a TIG welding mode
selected, the following welding sequence will occur.
Visualization
As shown here, after
the TIG torch trigger is
quickly pressed and
released from step 3A,
it is possible to press
and hold the TIG torch
trigger another time to
end the downslope time
and maintain the output
current at the Crater
current. When the TIG
torch trigger is released
the output will
12
machine is turned OFF.
Action
Press several times until the LED above lights up
Press and hold the TIG torch trigger to start the
sequence. The machine will open the gas valve to
start the flow of the shielding gas. After the preflow
time, to purge air from the torch hose, the output of
the machine is turned ON. At this time the arc is
started according to the selected welding mode.
After the arc is started the output current will be at
the Start current. This condition can be maintained
as long as necessary.
If the Start current is not necessary, do not hold
the TIG torch trigger as described at the beginning
of this step. In this condition, the machine will pass
from Step 1 to Step 2 when the arc is started.
Releasing the TIG torch trigger starts the upslope
function. The output current will be increased at a
controlled rate, or upslope time, until the Welding
current is reached. If the torch trigger is pushed during
the upslope time the arc will stop immediately and the
output of the machine is turned OFF.
Press and hold the TIG torch trigger when the main
part of the weld is complete. The machine will now
decrease the output current at a controlled rate, or
downslope time, until the Crater current is reached.
This Crater current can be maintained as long as
necessary. When the TIG torch trigger is released
the output of the machine is turned OFF and the
postflow time will start.
Visualization