Lincoln Electric LN-23P Service Manual page 15

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DRIVE ROLL PRESSURE
The drive roll pressure is pre-set at the factory for
proper feeding. If the idle roll tension must be relieved
temporarily, see the Maintenance Section for proper
adjustment procedure.
ADJUSTING WIRE FEED SPEED AND
VOLTAGE
Set the wire feed as specified in the procedures using
the calibrated dial on the back of the LN-23P control
box. When the reduced wire speed switch (mounted
on the gun handle) is in Position No. 1, the wire feed
speed will be that which is indicated on the dial. In
Position No. 2, the wire feed speed will be 83% of the
figure indicated on the dial.
Set the voltage by adjusting the voltage control while
welding until the voltage specified in the procedures is
indicated on the meter. The meter reading with the
power source on but not welding is the open circuit
voltage. With some power sources, this voltage may
be significantly higher than welding voltage.
When establishing initial procedures, start with the
voltage control set near minimum. Strike an arc on
scrap steel. If the electrode gets hot but the arc fails to
start, increase the voltage settings until the arc can be
established.
NEVER set the power source open circuit voltage
higher than 50 volts. The LN-23P will not feed wire
(1)
when the voltage is higher than 50
When using the CV Converter or the DC-600 and inch-
ing wire (not welding) at open circuit voltages below 20
volts or above 25 volts, feeding may be unsteady or
the wire speed may vary from that set on the dial. This
condition does not exist while welding. Minimum
usable arc voltage is 14 volts.
NOTE: For improved readability of the voltmeter in
some applications, the voltmeter guard may be
installed rotated end for end. This will result in the pro-
tective bars crossing the meter face in a different loca-
tion.
MAKING THE WELD
Be sure the proper contact tip for either .068" or 5/64"
wire, as appropriate, is in the gun. The thread protec-
tor should cover the external threads on the nozzle.
Loosen the insulated socket head screw on the side of
the gun, rotate the gun nozzle to the position most
45 volts on DC-600.
(1)
OPERATION
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volts.
(1)
LN-23P
convenient for the particular application, and retighten
the screw.
When welding, set the wire feeder on the floor or hang
it near the work area as convenient. Place the LN-23P
to minimize the amount of spatter falling onto it.
Always avoid sharp bends and keep the gun cable
as straight as practical.
Be sure the electrode cable, work cable, and control
lead are connected and the power source is on.
Press the gun trigger to feed the electrode out of the
gun. Use a visible stickout equal to the electrical stick-
out specified in the procedures for the wire being used.
Position the gun with the wire just off or lightly touch-
ing the work. Press the gun trigger to start the arc.
Once the arc is established, the gun trigger can be
released while welding. The gun trigger interlock circuit
automatically keeps the welding process on. At the end
of the weld, pull the gun away from the work.
When not welding, always store the gun in the insulat-
ed tube on the front of wire feeder.
While welding with one feeder of a two-feeder installa-
tion the electrode of the second feeder is "HOT". Only
one feeder at a time can be used for welding. Do not
press the gun trigger of the idle feeder while the other
feeder is being used since this can shut down the feed-
er being used for welding.
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