Migatronic PI Manual De Instrucciones página 10

PI control panels
TIG welding
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TIG welding
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The parameters can be adjusted with the control
knob after they are shown on the display. Press the
relative key to select the parameter. The relevant LED will
illuminate.
Pre-flow [s]
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Pre-flow is the period of time for which gas
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flows after the torch switch is pressed and before
the HF arc is established. Variable 0-10 sec. In the LIFTIG
process the period is the time until the torch is lifted away
from the workpiece.
Start Amp [A%]
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Immediately after the arc has been established,
the machine regulates the welding current to
the value stated in the Start Amp parameter. Start Amp is
set as a percentage of the required welding current and is
variable between 1-200% of the welding. Please note that
values higher than 100% generate a Start Amp bigger
than welding current.
Slope-up [s]
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Once the arc has been established, the welding
process enters a slope-up stage during which the
welding current is increased in linear fashion from the
value stated in the Start Amp parameter to the required
welding current. The duration of this slope-up time is
variable 0-20 sec in steps of 0.1 sec.
Secondary current level
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Adjustable from 10 to 200% of welding current.
You can enable this function in four-times mode only
by briefly pressing and releasing the torch trigger.
Please note that a current value of more than 100% will
generate a secondary current, which is higher than the
welding current.
Please note:
The secondary current function will be deactivated at a
current value of 100%.
Slope-down [s]
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When welding has stopped by activating the
trigger, the machine enters a slope-down stage.
During this stage current is reduced from welding current
to Final Amp over a period of time called the slope-down
time and variable 0-20 sec in steps of 0.1 sec.
Final Amp [A%]
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The slope-down stage is completed when the
current level has fallen to the value stated in the
Final Amp parameter. In 4-times it is possible to continue
in Final Amp mode until the trigger is released. Final Amp
is stated as a percentage of the required welding current
and is variable between 1-90% of the welding current.
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Spot time
The spot time in TIG is the time from the end of
slope up to beginning of slope down. Therefore, during
spot time the machine is welding with the adjusted
current. The LED flashes on and off when the function is
active.
Amp
spot
welding time
slope-up
Set welding
current
Set the timer before igniting the arc. The torch trigger,
depending from the selected torch mode can interrupt
the spot welding time. Variable 0.01-600 sec.
The function is disconnected when the time is set to 0 sec.
When used during tack welding, the timer can be set from
0.01 sec to 2.5 secs (See TIG-A-TACK).
Post-flow [s]
Post-flow is the period of time for which gas
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flows after the arc is extinguished and is variable
0-20 sec.
Synergic post-flow (option) can be activated by adjusting
time to less than 0 secs, if the IGC kit has been mounted.
The displays shows then IGC and the current post-flow.
The synergic post-flow can be adjusted +/- 50% by
pressing the -key pad and adjusting the control knob
(when the function is active).
IGC Gas control kit (option)
Adjustment of the gas flow is possible
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if a gas control kit has been installed as
special equipment. Press on the
pre-flow and gas post-flow icons are turned on. The gas
flow is variable 4-26 l/min.
Synergic gas flow can be activated by setting l/min to less
than 1 l. The display shows then IGC and the current gas
flow level. The synergic gas flow can be adjusted +/- 50%
by pressing the -key pad and adjusting the control
knob (when the function is active).
The gas valve will be completely open and the gas
adjustment is disconnected when the gas flow rate is set
to "OPn" (27l).
CWF wire program (option)
Press on the
up and slope-down icons are turned on.
The display will show X.YY where X is the CWF unit and
YY is the relative program number to be used.
Rotate the encoder to select unit/program. 0.00 is used
when NO CWF must be activated. (default).
Current type
It is possible to select either AC (alternating
current) or DC (direct current). In the TIG-welding
process, AC is used for welding of aluminium and its
alloys, while DC is used for the welding of other materials.
slope-down
time
trig down ( ) / up ( )
-key pad until the gas
-key pad until the slope-