MK Products Cobramatic 42VAC - Manual (Page 13)

Cobramatic ® Owner’s Manual - page 7
motor produces approximately 1 1/2 lbs. inches and approximately 4 1/2 lbs.
inches when in the all other wires position.
NOTE:
Operating the cabinet with the switch in the wrong
position will cause wire feed difficulties.
Posa Start Controls
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 feed speed is automatically changed from the slow run-in speed to the
welding speed set on the torch potentiometer.
Posa Start Operating Procedure
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 feed speed is automatically changed from the slow run-in speed to the
welding speed set on the torch potentiometer.
The Posa Start feature allows the Cobramatic® to be used in combination
with constant current DC welding power sources of open circuit voltage in
excess of 55 volts - also, any constant voltage welding power source capable
of a minimum of 50 amps.
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
setting. 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
Section B
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