Power Input Cables; Welding Guns - Lincoln Electric GMA WIRE FEEDERS LN-7 Operator's Manual

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K418 GMA TIMER KIT
This kit is available to provide the following functions:
1. Preflow Control – Provides flow of shielding gas
to the work before the arc is established. The
solenoid valve is energized immediately when the
gun trigger is closed, but the time delay before the
wire feeder is energized is adjustable to between
0 and 1.5 seconds.
2. Postflow Control – Provides flow of shielding gas
to the work after welding is stopped. Solenoid
valve shutoff delay after the trigger is released is
adjustable from 0.5 to 4.5 seconds.
3. Burnback Control – Provides a precise time delay
that allows the wire to be burned off at the end of
the weld. The delay is adjustable for optimum
burnback depending on the wire size, process,
procedure, etc.
4. Purge - Cold Inch Switch – Momentary Up
position energizes the gas solenoid but not the
wire feeder or welding power source. Momentary
down position energizes the wire feeder but not
the welding power source or the gas solenoid
valve.
Installation and operation instructions (M15059) are
included with the kit.
K417 DIGITAL VOLTMETER KIT
Includes a three digit LED display and a polarity switch.
Also includes a hold feature that freezes the display for
approximately six seconds at the reading just prior to
stopping welding. This feature allows the operator to
easily check his procedure at the end of the weld and
make adjustments if required. Installation instructions
(M15080) are included with the kit.
ACCESSORIES
K320 FLUX TANK
The K320 flux tank is available to permit the LN-7 or
LN-7 GMA to be used for submerged arc welding.
Install per the instructions shipped with the kit.
WIRE REEL DUST SHIELD DOOR
FOR K303
In extremely dusty and dirty locations this door kit can
be added to those units having the dust shield kit (S-
14543). This door kit includes a hinged door and
sliding bottom seal. When these parts are attached to
the reel support per the instructions included, the unit
becomes a completely enclosed housing. Order part
no. M11514.

POWER INPUT CABLES

A variety of power input cable assemblies are avail-
able for various current ratings and power source con-
nection types. All provide a polarized control cable
plug (MS-3106A-18-12S) and a lugged electrode
cable for connection to the wire feeder.

WELDING GUNS

INNERSHIELD GUNS
The K126 gun and cable assembly is recommended
for most welding with 0.062 in. through 3/32 in.
Innershield electrodes at up to 350 amps. Install the
insulated nozzle extension (or thread protector) and
the nozzle contact tip for the stickout and electrode
size being used. (See Figure C.1.)
LN-7 & LN-7 GMA
FIGURE C.1 – THE K126 GUN.
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