Saf-Fro PRESTOTIG 315 AC/DC Manual De Instrucciones página 20

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.
3A. 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.
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 again increase to the
Welding current, like in step 4,
to continue welding. When the
main part of the weld is complete go to step 3.
As shown here, again after the
TIG torch trigger is quickly
pressed and released from step
3A, it is possible to quickly
press and release the TIG torch
trigger a second time to end the
downslope time and
welding.
Spot TIG (GTAW welding)
Enter in Menu GTAW to enable spot welding function.
When enabled, the spot tig function replaces the 2S
trigger sequence.
To select Spot function:
Output
Press until the LED above lights up
This welding mode is especially thought to tack or weld
thin materials.
It uses HF start and immediately It delivers the set
current without any upslope/downslope.
When spot is selected automatically you have this
setting:

2S without restart

Working only in HF mode

Upslope and downslope are disabled
When spot is selected in left display without any welding
operation you can see the text:
S-0.0
While right displays shown the set current.
For default the spot time is 0s: that means the output
current is delivered only when the trigger button is
pushed.
The welding time is set with the spot time control and will
be constant independently from the operation of the
Trigger.
To set the spot time, user has to push SEL button until
text SPT appears on the left display: turning now the
main know is possible to set SPT time from 0 to 100s
stop
Visualization
English