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

Note D. When AUTO is selected, the starting
parameters are automatically recalled based on the set
current adjustable by main knob in the front panel.
Diameter of the electrode is automatically recalled based
on the following table
User dialed weld I (AMP)
> 227
<=227 and > 153
<=153 and > 67
<=67 and > 27
<=27
4mm diameter starting parameters are never recalled
when DIA = AUTO.
Note E. When ADV option is enabled, the user can
create his personal starting setting according to "TIG AC
starting parameters below).
Note F. This option is accessible only when a specific
diameter is selected. When DIA = AUTO or DIA = ADV,
that option is not visible.
WAVE-FORM selection
With this option is possibile to select between four
different waveforms:

"Soft" shape: to have a nice balance between a
focused Arc and low noise.

"Fast" shape: to have more focused arc.

"Sin" Wave shape: comparable with older
conventional machines, not very concentrated but
very soft.

"Triangle" shape: to reduce the amount of heat
delivered to the workpiece.
Default setting: SQRE
Tungsten Size and Type
In order to ensure the maximum performance and arc
striking reliability the operating parameters of the
machine are automatically adjusted to the type and size
of the tungsten electrode in use. Selecting the
appropriate diameter of the electrode, automatically a
recorder set of parameter is recalled to assure in both
DC and AC mode a good are striking. For AC welding
advanced users is present the possibility to modify the
AC starting parameters
Tig AC starting parameters
The unit is delivered not allowing to the user to change
starting parameters: for default option "Tig starting
parameters", from now on TSTR, is selected in AUTO.
When AUTO is selected for TSTR option, the value of
the 4 parameters settable (SCRT, STME, SSLP and
PCRT) and polarity (EP) are stored in unit and can be
modified by the user .
Following picture show the meaning of the parameter for
a local hand working. The ramp in SSLP time ends when
STRT current level is reached: if STRT is lower than
PCRT, the level will be PCRT.
Note: when PCRT is set in the range above, the
minimun current delivered by the unit is PCRT level
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Tungsten diameter
3.2 mm
2.4 mm
1.6 mm
1 mm
0.5 mm
The starting sequence changes also if the foot paddle is
present: in fact taking care of the STRT level is not
settable, the level at the end of the SSLP ramp is the
level from the footpaddle or the PCRT level.
NOTE: the setting parameters stored assure the striking
of the arc when correct electode (diameter and colour)
has been correctly selected.
In order to allow maximum flexibility to advanced users
that need complete control over the welding process, the
AC starting parameters can be modified by selecting
MANL for the TSTR (Tig Starting Parameters) option in
Menu C.
User can change polarity,
values of the other parameters creating its personal
waveform for starting.
NOTE: the changing of the parameters above, could
affect the striking of the arc if not correcting set.
Restart 2S, Restart 4S, Spot and Bi-Level
See GTAW section above for details about mode of
working.
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