MK Products Cobramatic 120 VAC V6 - Manual (Page 15)

Cobramatic ® Owner’s Manual - page 7
The Posa Start feature allows the Cobramatic ® feeder and gun to be used
in conjunction with constant current DC welding power sources of open cir-
cuit voltage in excess of 55 volts - also, any constant voltage welding power
source capable of a minimum of 50 amps.
Once the PosaStart circuit has transferred from slow run-in to weld speed,
the blue LED (L4) illuminates (Figure 7).
Figure 7
CV/CC Posa Start Operations
NOTE:
CV Posa Start does not need welding voltage sensing lead.
The default factory setting is CV mode. Attach Cobramatic ® cabinet to CV
power source according to the installation instructions.
Turn the Cobramatic
® cabinet to the “ON” position and the Posa Start to the
“OFF” position. Adjust power source to desired voltage for your weld condi-
tion. Depress gun trigger and adjust wire feed speed at gun to match voltage
setting.
Turn the Posa Start switch to the
“ON” position. Depress gun trigger and,
using Run-in Speed Control, adjust wire feed rate to approximately 50% of
welding wire speed set at gun.
Initiate an arc, and adjust wire feed speed at gun until correct condition is
achieved. At the moment when welding wire speed transition occurs, L4 will
illuminate.
POSA START WIRE SPEED NOTE:
Because the Posa Start Run-in Speed always remains a percentage
of the actual welding wire feed rate, the Posa Start run-in speed
will always slow down or speed up proportional to any
adjustment you now make at the gun. Therefore, if you slow down
the welding wire feed speed, you will have to increase
the Run-in Speed setting.
Remote Operation: Input/Ouput
The terminal strip TB1(reference Appendix pages) allows for external input
signals for remote operation of the feeder as well as output signals for volt-
age and wire speed measurements, for a wide variety of automatic and semi-
automatic applications. By making connections across specific points of
TB1, such functions as the trigger and motor speed control can be controlled
using an external source, such as a controller interface or a PLC (program-
mable logic controller).
Blue LED
when PosaStart engages.
L4
Figure 8