Migatronic PI 320 DC Manuel D'instruction page 25

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
current
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 20 A equals 60 A
when doing arc power. If the arc power is set to
100% the additional current is 40 A equals 80 A
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.
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.
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.
Additional current
supply from the arc
power function
short-
time
circuit
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.
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 3
different ways when this mode is selected.
For detailed information read the section "USER
MENU" of this manual about "4t.o."
Anti-freeze
This machine is provided with an anti-freeze control.
The anti-freeze-control reduces the current when the
electrodes stick to the weld piece. This makes it easier
to break off the electrode and welding can continue.
Reset to factory settings of all programs
It is possible to recall all factory standard parameters.
In this case all programs in the machine will be reset
to the following value:
•
MMA current 80A
•
MMA hotstart 50%
•
MMA arc power 50%
•
TIG Current 80A
•
TIG Spot Current 80A
•
Pre-flow 0.0 sec
•
Post-flow 3.0 sec
•
No slope-up/slope-down
•
Start amp 40%
•
Stop amp 20%
•
Second Current level 50%
•
Base amp 40%
•
Fast pulse frequency 49Hz (TIG DC HP)
•
Pause time = Pulse time = 0.1 sec (TIG DC HP)
The reset procedure is as follows:
Switch off the machine and wait until display is
extinguished.
Press the following
simultaneously:
Switch on the machine and keep the above keys
pressed until the display shows "X.XX". Then release
the keys.
X.XX is the software version of the program.
25
key pads