Trigger Mode - Migatronic PI 350 DC Manual De Instrucciones

Hot start
Hot start is a function that helps to establish
the arc at the beginning of MMA welding. This
can be achieved by increasing welding current (when
the electrode is applied to the workpiece) in relation to
the set value.
This increased start amp is maintained for half a
second, after which it decreases to the set value of
welding current.
Amp
0,5 s
Set welding
current
Welding
start
The hot start value reflects the percentage value by
which initial current is increased, and can be set
between 0% and 100%.
Arc-power
The arc power function is used to stabilise the
arc in MMA welding. This can be acheived by
increasing welding current during the short-circuits.
The additional current ceases when the short circuit is
no longer present.
Amp
Set welding
short-
current
circuit
Arc power can be adjusted between 0 and 100% of
the welding current setting.
E.g. If the welding current is set to 40A and arc power
to 50% the additional current is 20A equals 60A
when doing arc power. If the arc power is set to
100% the additional current is 40A equals 80A
when doing arc power.
Torch adjustment /
remote control – 7-poled plug
The regulation of welding current is made by
means of the torch potentiometer (optional). The
maximum current reachable is the level previously
adjusted on the front panel. The minimum current is
5A.
External adjustment –
8-poled plug (optional)
Can be used for foot pedal (optional) and
remote control units (optional) that use a 8-poled plug.
The function is used for arc ignition and adjustment of
the current. The maximum current reachable is the
level previously adjusted on the front panel. The actual
current is shown on the display.
Additional
current supply
from hot-start-
function
time
Additional current
supply from the arc
power function
time
Ignition methods
It is possible to choose between 2 different
methods of ignition for TIG welding: High-
Frequency (HF) and LIFTIG ignition. The ignition
method cannot be changed during welding. The
LIFTIG ignition is active when the indicator is
illuminated. The HF is automatically active when the
LED is switched off.
A third option permits the use of a TIG torch without
trigger: LIFTIG without TRIGGER.
HF-ignition
In HF-TIG ignition the eletrode should not touch the
workpiece. A high-frequency (HF) impulse initiates the
arc when the torch trigger is activated.
The HF will not arise and the machine will stop if the
electrode is in contact with the workpiece. Detach the
electrode and start ignition again.
LIFTIG-ignition
In LIFTIG ignition the TIG arc is ignited after making
contact between the workpiece and the tungsten
electrode, after which the trigger is activated and the
arc is established by lifting the electrode from the
workpiece.
LIFTIG-ignition without Torch trigger (TIG)
This operation offers the possibility of using TIG
torches without trigger: turn ON the arc by touching
the workpiece with the electrode and lift the torch to
ignite the arc. To activate the operation keep pressed
for 3 seconds the keypad "trigger mode": the relative
led flashes on and off to indicate the new function.
Turn OFF the arc by removing the torch from the
workpiece.

Trigger mode

Selection of trigger mode. Four-times trigger
mode is active when the LED is illuminated,
and two-times trigger mode is active when the LED is
turned off. It is not possible to change trigger method
during the welding process.
Two-times
The welding process begins by pressing the torch
trigger. Welding continues until the trigger is released
again which effects the slope-down period. It is
possible to configure the machine to work in 2 different
ways when this mode is selected.
For detailed information read the section
"USER MENU" conc. "2t.o."
Four-times
The welding process begins by pressing the torch
trigger. If the torch trigger is released during the slope-
up period welding continues with the adjusted welding
current. In order to stop the welding process the
trigger must be pressed again for more than 0.5s after
which the slope-down period begins. The slope-down
period can be stopped by releasing the trigger.
Thereafter the post-flow starts.
It is possible to configure the machine to work in
4 different ways when this mode is selected.
For detailed information read the section
"USER MENU" conc. "4t.o."
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