Control Unit - Migatronic FOCUS TIG 200 AC/DC HP Manuel D'instructions

Control knob
All parameters are set by the use of only
one control knob. These parameters include
current, slope-down time, etc.
This control knob is positioned in the right
side of the control panel. The digital display shows the
value of the parameter being set. The unit of
measurement of the parameter is shown on the right
side of the digital display.
A parameter can be selected by means of the relative
keypad in the relevant section. A bright indication light
indicates the parameter selected. The control knob is
then used for setting a new value.
Welding current
The key pad can be used to display the
welding current.
Adjustable from 5A to 200A. After the welding process
has stopped, the adjusted current is shown on the
display. During welding, however, the actual welding
current is shown. During pulse welding an average
welding current is automatically shown when shifting
between welding current and base current becomes
faster than possible viewing.
Units for parameters
Units of measurement of the selected para-
meter.
Welding voltage indicator
The welding voltage indicator is illuminated for
reasons of safety and in order to show if there is
voltage at the output taps.
Overheating error indicator
The overheating indicator is illuminated if
welding is interrupted due to overheating of the
machine.
Mains error indicator
The mains error indicator is illuminated if the
mains voltage is more than 15% lower than the rated
voltage.

CONTROL UNIT

Secondary parameters
before the HF arc is established, or until the torch is
lifted away from the workpiece in the LIFTIG process.
Variable 0-10 sec.
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.
variable 0-20 sec.
welding process, AC is used for welding of aluminium
and its alloys, while DC is used for the welding of other
materials.
alloys. The function is a balance based on time
between the positive and negative halfperiod.
Adjustment is possible between 20 and 80 percent as
the statement in percent is based on the negative part
of the period time. Adjustment continues until a suit-
able refinement zone is established around the molten
pool. Forcing the balance to 100% the machine will
execute one "preheating" action in positive polarity,
followed by standard continuous negative welding.
This function is intended to "clean" the material at the
beginning of each welding.
14
Pre-flow [s]
Pre-flow is the period of time for which gas
flows after the torch switch is pressed and
Slope-down [s]
When welding has stopped by activating the
trigger, the machine enters a slope-down
Post-flow [s]
Post-flow is the period of time for which gas
flows after the arc is extinguished and is
Current type
It is possible to select either AC (alternating
current) or DC (direct current). In the TIG-
AC-t-balance (based on time)
Adjustment of the refinement function during
the AC TIG welding of aluminium and its