Lincoln Electric LN IM311-E - Manual (Page 13)

B-3 OPERATION B-3
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.
For older Code units (9805), never set the power
source open circuit voltage higher than 50
(1) volts. The
LN™-23P will not feed wire if the voltage is higher
than 50
(1) volts. When using these older units with a
CV Converter or a DC-600 and inching wire (not weld-
ing) 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
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 keep the gun cable as straight as practical
and avoid sharp bends.
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 cir-
cuit 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
feeder being used for welding.
LN™-23P
(1) 45 volts on DC-600.