Lincoln Electric Cobramatic K2259-1 Operator's Manual page 15

release trigger to start welding functions - pull trigger again and release to
stop welding functions.
The Prepurge/Postpurge functions are pre-configured to provide a preset
amount of pre & postpurge gas time; 0.25 and 2.0 second respectively. The
default factory position of this jumper is horizontal (top right) across pins.
Changing the position of the JP3 jumper changes the configuration of the pre
& postpurge sequences. Refer to Figure 5 for the desired pre and postpurge
sequence. Once the desired sequence is selected, relocate on JP3 jumper
from its horizontal default pattern (top right) to its new vertical sequence posi-
turn.
Figure 5
Pre-Purge Settings & Adjustments (JP2)
The Pre-Purge Jumper/Pot Configuration at JP2 has 3 available settings:
0.25 sec. fixed, variable from 0-1 sec. or variable from 0-5 seconds.
By default, the twin two-pin jumpers, across rows 1 & 3, are configured for
0.25 sec. Just to the left of the jumpers is a ¾-turn potentiometer (pot) which
is used with both variable settings. For the 0-1 sec. range, move the jumpers
across rows 3 & 5. For the 0-5 second range, move the jumpers across rows
5 & 7 (Figure 6a).
Rows 3 & 5: 0-1 sec.
Rows 1 & 3: 0.25 sec. fixed Rows 5 & 7: 0-5 sec.
Figure 6a
Timing adjustment for the variable settings are as follows: Move the jumpers
to either variable setting location. Turn potentiometer screw (Small flat or
cross-head) half way. Pull gun trigger and count time between red contactor
wire feed LED (L2) and yellow Gas Solenoid LED (L1). Adjust pot screw as
necessary.
Post-Purge Settings & Adjustments (JP1)
The Post-Purge Jumper/Pot Configuration at JP1 has 2 available settings: 2
sec. fixed and variable from 0-5 seconds.
By default, the two-pin jumper across the top-and-middle pins, is configured
for 2 sec. Just to the left of the jumper is a ¾-turn pot which is used with the
variable setting. For the 0-5 second range, move the jumper from the top-
and-middle to the middle-and-bottom pins (Figure 6b).
Cobramatic Owner's Manual - page 5
®