Control Unit - Migatronic FOCUS TIG 200 PFC Manuel D'instruction

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. Press the key for 3 seconds
to display the arc voltage (valid ONLY for TIG DC and MMA DC).
Press again "A" to display the welding
Units for parameters
Units of measurement of the selected parameter.
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 lit if the mains voltage is more
than 25% lower than the nominal mains voltage.
Secondary parameters
Pre-flow [s]
Pre-flow is the period of time for which gas flows after the
torch switch is pressed and before the HF arc is
established, or until the torch is lifted away from the work-
piece in the LIFTIG process. Variable 0-10 sec.

CONTROL UNIT

current.
Slope-down [s]
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.
Post-flow [s]
Post-flow is the period of time for which gas flows after
the arc is extinguished and is variable 0-20 sec.
Current type (TIG AC/DC)
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.
AC-t-balance (based on time) (TIG AC/DC)
Adjustment of the refinement function during the AC TIG
welding of aluminium and its 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 suitable refinement zone is established
around the molten pool.
Electrode preheating (TIG AC/DC)
The length of the preheat period depends on both the
diameter of the electrode and the angle of the point of the
electrode, as well as the size of the ball at the end of the
electrode.
Adjustment is possible from 1 to 15, with 1 being the minimum and
15 being the maximum preheat periods. If the period is too short the
pilot arc will extinguish shortly after ignition. The size of the ball at
the end of the electrode will increase if the pre-heat period is too
long.
current. It is possible to adjust:
Pulse time
Adjustable from 0.01 to 10 sec. in DC and from 0.1 to 10
sec. in AC, in steps of 0.01 sec.
Pause time
Adjustable from 0.01 to 10 sec. in DC and from 0.1 to 10
sec. in AC, in steps of 0.01 sec.
Base amp
Adjustable from 10 to 90% of the pulse current.
Electrode welding (MMA)
Is used for selection of electrode welding. It is not possible
to change welding process during welding.
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.
9
Slow pulse
(TIG DC and TIG AC)
Is used for selection of slow pulse.
The pulse current is equal to the set