Kemppi KM 400 MVU User Manual

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3.3.4 Adjustment of MIG dynamics (arc force)

When you press button 3, you can adjust the MIG welding dynamics of the machine by means

of the right-hand knob, 11. The welding dynamics setting affects the properties of the welding

arc and the amount of spatter as follows:

• The value 0 is the recommended basic setting.

• Use values -1 … -9 if you want a softer arc and less spatter.

• Use values 1 … 9 if you want a rougher and more stable arc. This setting is useful when

you are using 100% CO2 shielding gas when welding steel.

3.3.5 Gas test

The gas test button (5) opens the gas valve without activating the wire feed or power source.

By default, gas flows for 20 seconds. The gas flow time remaining is shown on the display.
The right-hand knob (11) allows you to set the default gas flow time, between 10 and 60

seconds, and store the new default value in the machine’s memory. To abort the gas test, press

the start button or gun switch.

3.3.6 Wire feed test

When you press the Wire inch button, 6, the wire feeder engine starts but the gas valve does

not open and the power source is not activated. The default wire feed speed is 5 m/min, and

you can adjust the speed with the right-hand knob. When the button is released, the wire

feeding stops. The machine automatically goes back to the normal state after approximately

five seconds from release of the button or immediately when you press the start button.

3.3.7 Selection of liquid- or gas-cooled MIG gun

You can select a MIG gun cooled with liquid or gas by pressing buttons 3 and 5 simultaneously

and holding them down for at least one second.

• When the display reads ‘GAS’, you can use a gas-cooled MIG gun with the equipment.

• When the display reads ‘COOLEr’, you can use a liquid-cooled MIG gun with the

equipment.

You can change the gun selection by pressing buttons 3 and 5 again, as above. With a liquid-

cooled gun selected, the liquid cooling function is started when the power source is started

the next time.

3.3.8 Retrieval of weld data

The weld data function allows you to return to the welding current and voltage used during

the previous session, with the weld data feature. To use the feature, press buttons 5 and 7

simultaneously.

3.3.9 Selection of control panel

Button 12 allows you to switch control between the control panels in the power source and

wire feeder. The indicator shows which of the control panels is in use.

• When the ‘LOCAL’ light is on, the wire feeding speed and welding current are set using

knobs 10 and 11 of the power source control panel.

• When the ‘REMOTE’ light is on, the wire feed speed and welding current are set using the

control panel of the wire feeder. Knobs 10 and 11 of the power source are disabled in this

mode.

3.3.10 Setting of the MIG operating mode

Button 9 allows you to set the MIG welding gun to either two-sequence or four-sequence

mode. The indicator shows the mode selected.

• In two-sequence mode (2T), welding is started by pressing the gun switch and stopped

by releasing the switch.

• In four-sequence mode (4T), the following actions take place:

When you press the gun switch, the shielding gas starts to flow.

When you release the switch, welding starts.

When you press the switch again, welding ends.

When you release the switch again, the flow of the shielding gas ends.

FastM

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