Migatronic NAVIGATOR 2500 Manuel D'instruction page 17

Overheating
The overheating indicator is alight or flashes on
and off with a yellow light if welding is interrupted due
to overheating of the machine. The indicator remains
illuminated 5 seconds after the overheating error is
removed. Please read chapter conc. "fault indification".
Mains error
The mains error indicator is illuminated with red if the
mains voltage is too high or low. The indicator remains
illuminated 5 seconds after the mains error is
corrected so short-term errors on the mains voltage
can be noticed by the welder. Please see paragraph
conc. fault indification.
Welding process
This display is used to select the
welding process, e.g. MMA electrode or TIG. The
function is fixed during welding, and shift from TIG to
MMA is not possible before the post-flow has been
finished.
MMA electrode
MMA electrode welding has been selected.
TIG
TIG welding has been selected.
Function of the torch trigger
(The trigger method)
This display is used to decide whether the start/stop
method of the TIG welding process is to be two-times,
four-times (latching), or spot. Welding process means
the phases: pre-flow, slope-up, welding with adjusted
current, if necessary, reduced current, slope-down and
post-flow. 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. The
machine can be reactivated during slope-down and
gas post-flow.
Four-times
The welding process begins by pressing the torch
trigger. Releasing the torch trigger during gas pre-flow
activates the slope-up period. 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
after which the slope-down period begins. The slope-
down period can be stopped by releasing the trigger.
Amp
slope-up
Set welding
current
Spot
The welding process begins by pressing the torch
trigger. Welding stops automatically, depending on the
time set in spot time.
the method by which the required welding current shall
be established. This adjustment method cannot be
changed during the welding process.
Internal adjustment
The control knob positioned below the digital
display is used to set the current.
External adjustment
Current setting to be by means of a Migatronic
remote control unit. The remote control unit is
connected to a plug positioned on the rear of the
machine (not standard equipment).
Torch adjustment
Current setting to be by means of the current
control knob located in the handle of a Migatronic
dialog torch, if a dialog torch is used. The maximum
current is set with the control knob on the front panel.
The torch control is used to reduce the current from
the maximum set current to the minimum current.
tween two different methods of ignition for TIG
welding: High-frequency (HF) and LIFTIG ignition. The
method of ignition cannot be changed during the
welding process.
Two-stroke
This symbol means contact-free striking. The
arc is established in the following way:
1) The torch is placed so that the Tungsten electrode
is quite close to the welding spot (1 or 2 mm).
2) The torch trigger is activated, and the high voltage
generator of the machine will produce a voltage
impulse that ignites the arc. The welding process
has started. The welding process will stop when
the torch trigger is deactivated. The arc will
extinguish after the period of slope-down time. The
torch is held at the welding spot until after the
period of gas post-flow time in order to protect the
welding spot against oxidation.
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slope-down
time
trig down ( ) / up ( )
Amp setting function
The keypad is used to select
Ignition of TIG welding
It is possible to choose be-