Setting Run-In Speed On Standard Power Mig® Feeder; Operating Instructions For Timer Settings - Lincoln Electric 11519 Service Manual

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SETTING RUN-IN SPEED ON STAN-
DARD Power MIG® FEEDER
FAST OR SLOW RUN-IN MODE SELECTION,
(When Timer Option is not installed)
The Power MIG® 255XT is factory set for fast run-in
mode where the wire feed will accelerate directly to the
preset wire feed speed when the gun trigger is closed.
Slow run-in mode may also be selected, where it will
initially feed wire at 50 IPM until output current is
sensed or for 1.0 seconds, whichever occurs first. After
which it will accelerate to the preset wire feed speed.
NOTE: See operating instructions for Timer Option Kit
if it is installed, as it provides its own Run-in
operation.
INSTRUCTIONS TO ENTER SLOW RUN-IN
1. Turn power OFF on front panel of Power MIG®
255XT.
2. Turn the wire feed speed dial to minimum, fully
counterclockwise.
3. With the gun trigger closed, turn the power ON at
the front panel of the Power MIG® 255XT.
4. The display will read "SLO run".
INSTRUCTIONS TO ENTER FAST RUN-IN
1. Turn power OFF on front panel of Power MIG®
255XT.
2. Turn the wire feed speed dial to maximum, fully
clockwise.
3. With the gun trigger closed, turn the power ON at
the front panel of the Power MIG® 255XT.
4. The display will read "FAS run".
NOTE: Arc starting characteristics may be effected
when using the fast run-in mode since optimum
starting processes are being overridden.
On the initial trigger closure at power up, no output
power or wire feed will be available until the trigger is
opened and reclosed, regardless of wire feed speed
dial setting.
OPERATION
It is not necessary to repeat either of the above
procedures each time the unit is powered up. The unit
will remember the run-in mode from the previous
power down and return you to that same state upon
your next power up. Thus, you need only perform one
of the above procedures when you want to change the
run-in mode.
OPERATING INSTRUCTIONS FOR
TIMER SETTINGS
Select the desired mode with the selector switch:
A. Normal Welding mode provides weld power only
while the trigger switch is depressed.
B. 4-Step Trigger interlock mode eliminates the need
to hold the gun trigger while welding. It operates in 4
steps:
1. Close trigger and establish welding arc.
2. Release trigger and continue welding.
3. Reclose trigger near end of weld.
4. Release trigger again to stop welding.
If the arc is broken while using this feature, the
machine will reset to the "trigger off" condition
automatically.
NOTE: 4 Step Trigger interlock mode does not function
with a Spool Gun.
C. Spot Weld Mode is used for tack welding parts into
position or for spot plug welds to hold thin sheet
metal together prior to manual stitch or continuous
welding. To use this feature, adjust the On-Time (0-
5 seconds) as appropriate to obtain the desired
results. Closing the trigger initiates a single timed
spot weld cycle.
Plug welds are made by using a punch to make a
3/16" (5 mm) diameter hole in the top sheet and arc
welding through the hole into the back sheet.
To make spot plug welds, punch 3/16" (5 mm) holes
in the top sheet. Set the Spot Time control to
approximately 1.2 seconds and set the procedure
for the metal thickness to be welded. Install spot
weld nozzle (if available) on gun and press it
against the top sheet so the top and bottom sheets
are tight together. Close trigger and hold it closed
until the arc goes out. If a spot weld nozzle is not
used, smoother welds will result by moving the
welding wire in a small circle during the weld.
Power MIG® 255XT
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