25
Figure 11 - Burnback Control
4.0 OPERATION
4.1 STANDARD CONTROLS
4.1.1 POWER ON/OFF SWITCH & LAMP
The main power switch is located on the front panel in the
upper left-hand corner. This switch energizes the main
transformer, control circuitry and illuminates the Power “ON”
lamp. (Figures 12 &13)
4.1.2 FAULT LAMP FIGURE 12
THE FAULT LAMP IS CONFIGURED FOR FUTURE USE AND IS
NOT CURRENTLY ACTIVATED.
4.1.3 TEMP LAMP FIGURE 12
THE TEMP LAMP ILLUMINATES IF AN OVER TEMPERATURE
CONDITION OCCURS WITHIN THE MULTIMASTER 260.
THIS CONDITION MAY BE CAUSED BY EXCESSIVE DUTY
CYCLE OR OVERCURRENT CONDITIONS. WHEN AN OVER
TEMPERATURE CONDITION OCCURS, THE WELDING OUTPUT
IS TURNED OFF AND THE UNIT MUST BE ALLOWED TO COOL.
THE MACHINE WILL AUTOMATICALLY RESET WHEN THE
TEMPERATURE FALLS TO A SAFE LEVEL.
4.1.4 PROCESS SELECTOR SWITCH FIGURE 12
The three position process selector switch is located in the
upper righthand corner of the control panel. The process
selector switch provides the visual indication of which process
(Mig, Tig or stick) has been selected.
4.1.5 SECONDARY WELDING CONNECTIONS
The secondary output welding terminals, POS (+) and NEG
(-) are located in the lower right of the front panel, directly
beneath the NAS Mig Gun Connector (Figure 13). See 4.4, 4.5,
and 4.6 for Setup Guides for specic application.
4.1.6 DIGITAL DISPLAYS WFS, AMPS & VOLTS
The digital displays located on the left side of the control
panel are multi-functional depending on the welding process
being used.
4.1.7 MIG WELDING
In the Mig process mode, the digital displays will read preset
wire feed speed in inches per minute and preset arc volts
when the PRESET button is pressed. Once welding begins,
the displays will show average welding current and volts in
the top and bottom display, respectively. The displays have
a “HOLD” circuit that retains the welding conditions. After
welding stops, the display will continue to show the last
welding current and voltage sampled until welding starts
again or the preset button is pressed.
4.1.8 TIG AND STICK WELDING
In the TIG and STICK process mode, you must depress and
hold the PRESET button while presetting the welding current
in the top display. Releasing the preset button causes the
display to return to zero. Once welding begins, the display
will show average welding current and volts in the top and
bottom display, respectively. After welding stops, the display
will again return to zero. There is no “HOLD” circuit for the
display when using the TIG and STICK process modes.
4.1.9 WIRE FEED SPEED CONTROL FIGURE 12
The wire feed speed control potentiometer allows wire feed
speed adjustments between 65 and 675 inches per minute
(IPM). Selecting the Mig process and pressing the PRESET
switch allows the wire feed speed to be preset in the top
digital display by turning the wire speed knob.
4.1.10 VOLTAGE/CURRENT TRIM FIGURE 12
The arc voltage is controlled with this knob when the Process
selector switch is in the MIG position. The Mig arc voltage
can be preset by pressing the preset button and reading the
preset arc volts in the bottom digital display while turning
this knob.
The arc current is controlled with this knob when the WELD
PROCESS SWITCH is in the TIG or STICK position. The welding
current can be preset in amperes by pressing the preset button
and reading the preset amps in the top digital display while
turning this knob. The actual arc voltage will be displayed
during welding.
4.1.11 BURNBACK CONTROL FIGURE 11
The burnback control is located inside the wire spool compart-
ment above the wire feed motor. The control knob adjusts
the time between when the wire feed brake is applied and
the welding contactor is turned “o”. This determines how far
the wire will burnback towards the contact tip after welding
is stopped. If the wire is sticking in the weld pool then turn
the knob clockwise a small amount and retest. Continue this
procedure until the wire clears the top of the weld pool or
burns back the desired amount.
SECTION 4 OPERATION
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