Kemppi MASTERTIG AC/DC 2000 Operation Instructions Manual - 3.3. Mma Welding
14 – Mastertig AC/DC 2000, 2500, 2500W, 3500W/0510
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3.1. NUMERICAL DISPLAYS AND SIGNAL LIGHTS OF THE PANEL
Machine on
Heat protection
Wrong mains voltage, over or under-voltage
Display of
welding current
or set value
current
Display of
welding voltage
or parameters
Units of the display
The signal light of thermal protection is on when the machine has over-heated. Let the machine on so
that the fan will cool the machine. Wait until the light goes off, and you can continue welding.
The light for the wrong voltage turns on if the mains voltage is too high or too low. Check the voltage
setting of the machine and/or the mains voltage. The wrong voltage light will also turn on if there is a
momentaneous over-voltage in the mains supply.
The current is displayed with a tolerance of 3 % ± 2 A; the voltage with a tolerance of 3 % ± 0.2 V.
3.2 USE OF THE REMOTE CONTROL
The remote control is selected from the key REMOTE. With
the remote control you can adjust the welding current of MMA
and TIG welding. The values of the parameters (up-slope and
down-slope times, gas flow times etc.) are adjusted from the
current knob.
With remote control unit C 100AC you can also change the
welding method (MMA / TIG). The machine selects the polarity
(type of current) in accordance with an advance selection on
the panel.
3.3. MMA WELDING
3.3.1. Selection of type of current
Select MMA welding by pressing the selection key of MMA welding. The signal light of the
type of current indicates the current type selected: AC, DC-, DC+.
Change the current type by pressing the MMA selection key again and the current type will
change and the signal light will show the current type selected.
3.3.2. Broken arc method
Press the BROKEN ARC key and the signal light for broken arc method turns on.
A broken arc method has to be used if the seam to be welded cannot tolerate the heat of a
continuous arc. The heat of the welding is controlled by breaking the arc. Usually the reason is
thin material or various fittings. In the broken arc method position, the arc breaks faster and the
ignition pulse is smaller then in ordinary MMA welding.