MK Products Cobra SX - Manual (Page 10)

Cobra ® SX Owner's Manual - Page 2
Electric Cable
A seven conductor control cable is used on the Cobra ® SX gun. The gun end
of the control cable is secured to the gun with a boot clamp and soldered to
the pot assembly, trigger and motor leads. Slack is left in the electric cable
as it exits the back of the gun to prevent cable breakage. The cabinet end
has a seven pin “W” clocked amphenol connector.
Section B Operation
General
The Cobra ® SX gun maintains a constant, steady, uniform wire feed speed,
regardless of curved or looped wire conduit. The constant push exerted
by the slave motor in the cabinet, combined with the pull of the gun motor,
causes the wire to literally float friction-free through the wire conduit. The
24VDC gun motor is controlled by a three and three-quarter (3 3/4) turn
potentiometer in the gun handle.
Controls and Settings
Potentiometer
The laterally-positioned potentiometer is located in the lower end of the
handle, providing up to 800 ipm with 3 3/4 turns.
Micro Switch
The micro switch assembly consists of the micro switch and leads.
Trigger Sensitivity
The amount of trigger lever travel can be
shortened for a “quicker” or “more responsive”
action.
A more sensitive trigger lever is produced by
reducing the gap between the trigger lever and
the micro-switch lever. By turning-in the Trigger
Sensivity Adjustment Screw (Figure 1), it closes
the gap between the trigger lever and the micro-
switch lever. This will enable the operator to
increase the sensivity of the trigger lever.
Sensitivity Adjustment
With the wire feeder turned on (with or without
welding wire loaded), turn the screw in until
the micro-switch is activated (Figure 2). Once
activated, the gun and wire feeder motors will begin
feeding wire. Retract the screw accordingly until
the system is deactivated and adjusted to the operators’ liking.
Drive Roll and Idler Rolls
General
The Cobra ® SX gun comes standard with a knurled drive roll and a grooved
idler roll, ready for welding aluminum wire diameters from .030” up to 3/64”.
An optional grooved idler roll, for wire diameter .023” is available as P/N 511-
0113. Insulated V-Groove drive roll kits are also available for aluminum wire,
(see Optional Kits).
Drive roll tension is accomplished with a unique spring-loaded pressure
screw. The Cobra
® SX comes from the factory with the pressure adjustment
screw preset.
NO ADJUSTMENT is required for all sizes and types of wires.
Drive Roll Installation/Removal
Note:
Neither of the handles needs to be removed to access the Drive or Idler Rolls
Figure 1
Figure 2