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CONTROLS AND SETTINGS
Operator controls are illustrated in Figure B.1. Refer to
the figure and the following explanations of the
controls.
WIRE FEED SPEED CONTROL. This control sets the
feed speed of the wire feeder. Turn the knob to the left
for slower speeds and to the right for higher speeds.
The control is calibrated. The nameplate shows the
wire speed for the given setting of the control.
BURNBACK CONTROL (OPTIONAL). This control,
located on the optional K419 Burnback Timer and K418
GMA Timer Kits, provides a precise time delay that
allows the wire to be burned off at the end of the weld.
This is useful for those applications where higher
speed, fine wire feeding is used and there is a
tendency for the electrode to overrun at the end of the
weld and cause “sticking” in the crater. The delay is
adjustable for optimum burnback depending on wire
size, process, procedure, etc.
PREFLOW CONTROL (OPTIONAL). This control,
located on the optional K418 GMA Timer Kit, provides
flow of shielding gas to the work before the arc is
established. The gas solenoid valve is energized
immediately when the gun trigger is closed, but the
time delay before the wire feeder is energized is
adjustable from 0 to 1.5 seconds. Turn the knob to the
left for shorter delays and to the right for longer delays.
POSTFLOW CONTROL (OPTIONAL). This control,
located on the optional K418 GMA Timer Kit, provides
flow of shielding gas to the work after welding has
stopped. Delay for the gas solenoid valve shutoff is
adjustable from 0 to 1.5 seconds. Turn the knob to the
left for shorter delays and to the right for longer delays.
PURGE - COLD INCH SWITCH (OPTIONAL). This
control, located on the optional K418 GMA Timer Kit,
provides control of some wire feeder functions without
energizing the welding power source. The momentary
up position energizes the gas solenoid but not the wire
feeder or welding power source. The momentary down
position energizes the wire feeder but not the gas
solenoid or the welding power source.
ELECTRODE POLARITY SWITCH (OPTIONAL). This
switch, located on the optional K416 Digital and K417
Analog Meter Kits, controls the polarity of the meter.
Set this switch to the same polarity as the electrode
lead to allow correct operation of the meter.
OPERATION B-3
LN-7 GMA WIRE FEEDER
POSTFLOW
CONTROL
(OPTIONAL)
PREFLOW
CONTROL
(OPTIONAL)
PURGE-COLD
INCH SWITCH
(OPTIONAL)
WIRE FEED
SPEED CONTROL
ELECTRODE
POLARITY SWITCH
(OPTIONAL)
BURNBACK
CONTROL
(OPTIONAL)
FIGURE B.1 – WIRE FEEDER CONTROLS.