Kemppi Kempact 251R Operating Manual page 21

3. Control knob for welding voltage
This control knob increases and reduces the available output voltage of the machine to the
welding arc. The scale is regulated in volts and is also supported by a graphical display bar that
indicates the proportion of the available output voltage selected.
4. Shielding gas button
GAS
This button sets the machine's dynamics range for either mixed (Ar/C0₂) or carbon dioxide
(C0₂) shielding gas. A single press of the button changes the set-up for the intended gas type.
The selected shielding gas type is shown in the LCD display panel. If using argon shielding gas
for aluminium or CuSi MIG brazing filler wires, use the mixed gas setting (Ar/C0₂).
5. Timer button for spot and cycle arc welding
SPOT /
CYCLE
The spot and cycle arc timer offers two modes of function. By pressing and selecting the SPOT
timer, you regulate the time duration for one single 'SPOT' welding cycle from either 0.1 to 9.9
seconds of arc time. By selecting the 'CYCLE' arc timer you regulate the machine to a repeating
cycle of arc time and pause time. The pause time offered is 0.1 to 3 seconds. Select function by
depressing button 4. Regulation and adjustment of SPOT and CYCLE arc values are adjusted
by the voltage control (item 3). Function selection is confirmed by either one dot (SPOT TIME)
or dash line (CYCLE TIME) under the word 'Timer' in the display.
6. 2T/4T gun switch latching button
2T / 4T
This button offers you two modes of welding gun functions. The selected mode is indicated as
either 2T or 4T in the display.
• In 2T mode the welding arc is started by a single press and hold of the welding gun
trigger. Welding continues whilst the trigger is held, and stops when the trigger is
released.
• In 4T mode the gun trigger is pressed and gas starts to flow. When the trigger is
released, the arc ignites. Welding continues until the trigger is pulled and released for a
second time. This mode is useful for long welding durations.
7. Selection for MIG/MAG or HOT SPOT welding function
MIG
HOT SPOT
This button switches the machine from standard MIG/MAG welding mode to a specialised
process function for localised spot heating and stress relieving for metal panels.
This function is normally used in the automotive industry and light sheet fabrication. To switch
between functions, press and hold the button for 5 seconds. See further information on HOT
SPOT function later in this manual.
8. Parameter display
The large illuminated parameter display is designed to provide excellent visibility of welding
values and machine settings in a variety of welding situations. The display is protected by a
polycarbonate lens fitted into the control panel housing.
© Kemppi Oy / 1135
EN
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