MK Products MK Cobramatic Pro Series - Manual (Page 13)

Cobramatic ® Pro Series Owner’s Manual - Page 6
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).
Timing adjustment for the variable settings are as follows: Move the jumpers
to variable setting location. Turn potentiometer screw (Small flat or cross-
head) half way. Upon release of gun trigger, count time between yellow Gas
Solenoid LED (L1) and green Trigger LED (L3). Adjust as necessary.
Wire Inch
Wire Inch momentary switch causes wire feed at the weld feed rate indepen-
dent of Posa Start and may be used to observe or time the weld wire feed
rate without turning Posa Start off. The contactor is not activated during “Wire
Inch.”
Gas Purge
The Gas Purge momentary switch operates the gas solenoid in the cabinet.
Meter
The LED Meter provides a continuous reading of wire feed speed in inches
per minutes. While welding, the meter will display weld voltage.
NOTE:
The Work Ground Wire must be at Work Ground Table in order to dis-
play weld voltage.
Posa Start Operating Procedure
CAUTION:
Do not operate this wire feeder on a power source having a high-fre-
quency (HF) starting circuit until the high frequency feature has been
turned off or disabled. Failure to disable the HF will result in damage
to the PosaStart circuitry of the main board.
General
The Posa Start Run-in Speed Control, located on the front panel, provides
adjustment for slow wire run-in. Once the arc has been established, the wire
Middle/Bottom: 0-5 sec. Top/Middle: 2 sec fixed
Figure 6b
Figure 6a
Rows 1 & 3: 0.25 sec. fixed Rows 3 & 5: 0-1 sec. Rows 5 & 7: 0-5 sec.