MK Products Cobramatic 42VAC - Manual (Page 14)

Cobramatic ® Owner’s Manual - page 8
amperage control set to “Panel” or “Standard” depending on power supply.
Turn the Cobramatic® power switch to the “ON” position and the Posa Start
switch to the “OFF” position.
Adjust power source to desired amperage for your weld condition.
Press gun trigger and adjust wire feed speed at gun to match current setting.
If approximate wire feed speed is not known, it is better to start with excess
wire feed rather than too little, in order to prevent possible damage to the
contact tip.
Turn Posa Start switch to the
“ON” position. Press torch trigger and, using
Run-in Speed Control, adjust wire feed speed to approximately 10% of weld-
ing wire speed set at torch.
Strike an arc; if the wire stubs out, reduce wire feed rate at gun, or increase
amperage setting on power source.
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.
Section C OPTIONAL KITS
The following is a list of Optional Kits available for the Cobramatic ® Wire
Feeder.
A detailed description of each kit is given later in this section.
P/N Description
005-0674 Gas Purge/Trigger Latch Kit
005-0675 Water Pressure Kit
005-0674 Gas Purge/Trigger Latch Kit
The Gas Purge/Trigger Latch Kit is a dual function kit. The kit includes an
easy to install interface control PC board, a 24VAC solenoid for pre and post
purge control, a modified valve stem for the welding torch and, a front panel
switch for activating the Trigger Latch mechanism.
The gas control times have been preset to 0.5 seconds pre-purge and 1.0
seconds post-purge. This offers an optimum amount of inert gas shielding
prior to striking the arc and after the arc has been extinguished.
The Trigger Latch mechanism gives the operator the flexibility of normal
trigger operation (pull trigger to weld - release trigger to stop). This also
offers the comfort of latched trigger operation (pull trigger once to latch and
weld - pull trigger again to unlatch and stop).
005-0675 Water Pressure Kit
By monitoring the pressure from the water recirculator, the switch uses the
pressure as the key safety element in protecting the torch from overheating
Section C
(Continued)
CAUTION:
Do Not operate this wire feeder on a power source having a high-frequency
starting circuit before making sure that the high frequency portion of the
power source is turned off.
Failure to take this precaution will cause permanent
damage to the Posa Start circuitry.