MK Products Cobra SX LE Com AC only - Manual (Page 10)

Cobra ® SX Lincoln Compatible ™ Owner's Manual - Page 2
Section B Operation
General
The Cobra ® SX Lincoln Compatible™ 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 Lincoln Compatible ™ 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 Lincoln Compatible ™ 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
1. Push the idler lever, this will relieve the pressure against the drive roll (as
shown in Figure 3).
2. Align the Drive Roll Removal Tool (P/N 931-0100) over the flats of the
drive roll (as shown in Figure 4). Hold the gun with one hand or on a
table top, with the other hand give the Removal Tool a quick snap-turn in
the CLOCKWISE DIRECTION.
Figure 1
Figure 2