Standard Controls; Mig Welding; Operation - ESAB Multimaster 300 Manuel D'instructions

sectIon 4

4.0 operatIon

comply with all ventilation, fire and other safety require-
ments for arc welding as established in the safetY section
at the front of this manual.
4.1 stanDarD controls
4.1.1 poWer on/off sWItch & laMp (figures 12 &13)
The main power switch is located on the front panel in the
upper left-hand corner. This switch energizes the main trans-
former, control circuitry and illuminates the Power "ON" lamp.
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 300/300X. This condition may
be caused by excessive duty cycle or over-current 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 specific 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 for 10 seconds, then
returns to "0".
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 av-
erage 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 "off". 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.
figure 11 - Burnback control
29
operatIon