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POWER MIG 255
ACCESSORIES
C-3 C-3
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3. Using a screwdriver, remove the two screws
securing the lower cover panel to the front of the
machine. Remove the lower cover panel.
4. Attach the rectangular 10-pin plug connector on
the timer kit wiring harness to the mating recepta-
cle connector located directly behind the removed
cover panel. Be sure that the latch on the connec-
tor is aligned with the one on the board and insert
it until the latch engages.
5. Align the timer panel for installation and carefully
insert the printed circuit board and wiring harness
through the opening. Make sure the wiring har-
ness is not pinched between panels or between
printed circuit board and front panel cover.
6. Secure the timer assembly with either the two
supplied screws or with the original screws. The
installation is now complete. Refer to the following
section for operating instructions.
OPERATING INSTRUCTIONS
FOR TIMER KIT
If the optional Timer Kit (K1701-1) is installed, select
the desired mode with the selector switch:
1. Normal Welding mode provides weld power only
while the trigger switch is depressed. This is the
same operation as when the Timer Kit is not
installed.
2. 4-Step Trigger interlock mode eliminates the
need to hold the gun trigger while welding. It oper-
ates in 4 steps:
a. Close trigger and establish welding arc.
b. Release trigger and continue welding.
c. Reclose trigger near end of weld.
d. 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.
3. 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 con-
tinuous 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 in. (5 mm) diam-
eter hole in the top sheet and arc welding through
the hole into the back sheet.
To make spot plug welds, punch 3/16 in. (5 mm)
holes in the top sheet. Set the Spot Time control
to approximately 1.2 seconds and set the proce-
dure 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.
4. Burnback Time control provides manual adjust-
ment of the burnback time (0-250 milliseconds) for
any selected welding mode. This control should
be set as low as possible without the wire “stick-
ing” in the puddle after each weld. Too long of a
burnback time may form a “ball” on the end of the
wire, or may “flash back” to the gun tip.
5. Run-In Mode is used to adjust the starting wire
feed speed. Starting conditions for certain welding
applications can be improved with adjustment to
the Run-In speed. The control allows for initial
starting speeds from 50 to 150 IPM. After the arc
is started, the set point on the wire feed speed
control will dominate. Note that the Run-in is not
functional with the spool gun. Also note that if
Run-in is set fully counterclockwise to OFF, Run-
in speed will equal the preset WFS on the
machine.