MK Products Cobramatic 120VAC - Manual (Page 13)

Cobramatic ® Owner’s Manual - page 6
Note:
Reverse polarity MUST be used.
Posa Start Connections
Attach the #14 single black lead which extends from the back of the cabinet
to the negative terminal of the power supply or work ground. The Posa Start
lead is internally connected to the P.C. board on terminal strip J6, terminal 2.
CV Posa Start Operations
Attach Cobramatic® to CV power source according to the installation instruc-
tions.
Turn the Cobramatic® to the “ON” position and the Posa Start to the “OFF”
position.
Adjust power source to desired voltage for your weld condition.
Depress gun trigger and adjust wire feed speed at gun to match voltage set-
ting. If approximate wire feed is not known, it is better to start with excess
wire feed rather than too little, in order to prevent a “burn-back”.
Turn the Posa Start switch to the “ON” position. Press torch trigger and,
using Run-in Speed Control, adjust wire feed rate to approximately 10% of
welding wire speed set at torch.
Strike an arc, and adjust wire feed rate at gun until correct condition is
achieved.
CC Posa Start Operation
Attach the Cobramatic® to a CC power source according to the installation
instructions.
Insure power supply high frequency switch is in the “OFF” position, and
power supply is set to DC reverse polarity.
The power supply contactor should be set to “Remote” or “Tig” and the
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.