Saf-Fro PRESTOTIG 315 AC/DC Manual De Instrucciones página 17

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 stop 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
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Visualization
14
Bi-Level (Set/A2) Trigger sequence
Enter Menu GTAW and enable BILV option.
When enabled, the Bi-Level tig function replaces the 4S
trigger sequence.
To select Bi-Level sequence:
Output
Press several times until the LED above lights up
When Bi-Level is selected in left display without any
welding operation you can see the text:
B-0.0
With this sequence the arc is started as in the 4S
sequence, this means that steps 1 and 2 are the same.
3. Quickly press and release the TIG torch trigger. The
machine will switch the current level from Set to A2
(background current). Each time this trigger action is
repeated the current level will switch between the
two levels.
3A. Press and hold the TIG torch trigger when
the main part of the weld is complete.
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.
To set the A2 level, user has to push SEL button until
text A2 appears on the left display: turning now the main
know is possible to set A2 in percentage of the setting
current.
NOTE: The Restart option and the Pulse function are not
available for Bi-Level Trigger sequence
LIFT TIG ON sequence
When lift tig process is selected, it is possible to
performe welding operation without the use of a trigger.
To select ON sequence:
Output
Press several times until the LED above lights up
When the sequence is selected it is possible to start a
weld with the lift method without pushing trigger.
To end the weld it is necessary to break the arc.
The parameter Starting current, Final slope and finishing
current are ignored.
Visualization
The
Visualization
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