Kemppi MLS 2500 - Manual (Page 12)

1 – Master MLs™ 500, 503, 3500, 3503, Mastertig MLs™ 3000, 3003, 4000, 4003 / 0649 © keMppi oy
1. MMA
Select MMA welding by pressing the selection button of MMA welding. The led is lit when
MMA is on.
2. Arc force
Press the arc force button and you will see the numerical value corresponding to the MMA dynamics
in the display. Factory setting for all electrode types is zero. You can change the value by turning
the pulse potentiometer. If numerical value is adjusted negative (-1...9) the arc is softened, and the
amount of spatter decreases when welding at the upper end of the recommended current range of
the electrode. On the positive side (1...9) the arc is rough.
In TIG mode, you can select the max. and min. current for the foot pedal (PEDAL LO/HI).
3. Hot start
When pressing the hot start button, you will see on the display the numerical value corresponding
to the MMA hot start pulse. You can adjust the value by turning the potentiometer. In TIG mode
you can select gas test function.
4. TIG welding is selected
4. Welding torch switch 2 sequence function
Gas flow starts when the torch switch is pressed. After preset pre-gas time welding starts, and
current will rise to the welding level within the up-slope time. Release the torch switch, and the
current starts to drop, and after the selected down-slope time the arc is broken. After this, the shield
gas will flow for the time selected.
4. Welding torch switch 4 sequence function
Gas flow starts when the torch switch is pressed. Release the torch switch. The ignition spark
ignites the arc, and the current will rise to the welding level within the up-slope time. Press the
torch switch down, and the welding continues. Release the torch switch, and the current starts to
drop and after the selected down-slope time the arc is broken. After this, the shield gas will flow
for the time selected.
5. HF/contact ignition in TIG welding (water fill)
TIG arc can be started either with high frequency (HF) or without (contact ignition). HF ignition
is chosen by pressing the HF CONTACT button (5) to turn on the HF light.
If you use water-cooled torch you can fill it with water by pressing the HF CONTACT button for
more than 2 seconds.
6. Remote control
If you choose to adjust the welding current with a remote control unit you need to connect the
unit and select the REMOTE button. The panel led switches off and you can select the unit (R10,
wireless remote control R11T for MMA welding, or foot pedal control R11F). There is an automatic
recognition of remote control units with potentiometers and only the symbol of a connected unit
can be chosen. The foot pedal control works only in 2T mode.
7., 8. and 14. Adjustment of parameters
To select TIG welding parameters you only need to use two buttons: arrow-left and arrow-right.
Adjustment is done with the potentiometer. When pressing the RETURN button, adjustment of
parameters goes straight to welding current. The display shows automatically numeric values and
the units of the parameters. When you adjust the parameters, you can see the value on the numerical
display. After 10 seconds, the display will return to the welding current.