Kemppi MasterTig MLS 4000 User Manual

Page 15

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
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.
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.