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4. Attach the rectangular 10-pin plug connector on the
timer kit wiring harness to the mating receptacle
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 harness
is not pinched between panels or between printed
circuit board and front panel cover.
6. Secure the timer assembly with either the two sup-
plied screws or with the original screws. The instal-
lation is now complete. Refer to the following sec-
tion 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:
A. 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.
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 auto-
matically.
C. Spot Weld Mode is 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" (5 mm) diameter
hole in the top sheet and arc welding through the
hole into the back sheet.
ACCESSORIES
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.
D. 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 "sticking" 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.
E. 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 - 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 counter clockwise to "OFF", Run-in speed will
equal the preset WFS on the machine.
PM 255
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