Lincoln Electric CITOTIG 200 AC/DC Operator's Manual page 18

4-Step Trigger Sequence
To select 4-Step sequence:
Output
Press several times until the LED above lights up
With the 4-step trigger mode and a TIG welding mode
selected, the following welding sequence will occur.
1. 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. In LIFT
starting the touching current is 25A until the short
circuit is removed.
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.
2. 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.
3. 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.
4. 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.
English
Visualization
16
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 turn OFF.
This sequence operation, 4-step with restart disabled, is
the default setting from the factory.
4-Step Trigger Sequence with Restart Option
To select 4-Step with restart sequence:
Output
Press several times until the LED above lights up
Enter Menu GTAW and enable 4RST option.
If 4-step restart is enabled from the setup menu the
following sequence will occur for steps 3 and 4 (steps 1
and 2 are not altered by the restart option):
3. Press and hold the TIG torch trigger. The machine will
now decrease the output current at a controlled rate,
or downslope time, until the Crater current is reached.
4. Release the TIG torch trigger. The output current will
again increase to the Welding current, like in step 2, to
continue welding.
If the weld is completely finished, use the following
sequence instead of step 3 described above.
3.A. Quickly press and release the TIG torch trigger.
The machine will now decrease the output current
at a controlled rate, or downslope time, until the
Crater current is reached and the output of the
machine is turned OFF. After the arc is turned
OFF the postflow time will start.
Visualization
English