Lincoln Electric LN-15 WIRE FEEDER SVM166-A Service Manual page 22

B-8
Hold with toggle switch in the DOWN position to acti-
vate Gas Purge and let the shielding gas flow. The gas
solenoid valve will energize but neither the power
source output nor the drive motor will be turned on.
The Gas Purge switch is useful for setting the proper
flow rate of shielding gas. Flow meters should always
be adjusted while the shielding gas is flowing.
2 STEP - TRIGGER INTERLOCK SWITCH
The 2 Step - Trigger Interlock switch
changes the function of the gun trigger. 2
Step trigger operation turns welding on
and off in direct response to the trigger.
Trigger Interlock operation allows weld-
ing to continue when the trigger is
released for comfort on long welds.
Place the toggle switch in the UP position
for 2 Step operation or in the DOWN
position for Trigger Interlock operation.
2 Step Trigger
2 Step trigger operation is the most common. When
the gun trigger is pulled, the welding power source
energizes the electrode output and the wire feeder
feeds wire for welding. The power source and wire
feeder continue welding until the trigger is released.
Trigger Interlock
Trigger Interlock operation provides for operator com-
fort when making long welds. When the gun trigger is
first pulled, the welding power source energizes the
output and the wire feeder feeds wire for welding. The
gun trigger is then released while the weld is made. To
stop welding, the gun trigger is pulled again, and when
it is released the welding power source output turns off
and the wire feeder stops feeding wire.
CAUTION
If the arc goes out while welding with trigger inter-
lock operation, the electrode output from the weld-
ing power source remains energized and the wire
feeder will continue to feed wire until the gun trig-
ger is again pulled and then released.
------------------------------------------------------------------------
FLOW METER
The flowmeter shows the flow rate of shielding gas and
has a valve to adjust the flow. The flow meter is cali-
brated for CO2, Ar, and CO2/Ar blends. The middle of
the ball indicates the flow rate of shielding gas.
Adjust the flow rate by turning the valve at the bottom
of the meter. Most weld procedures require 25-40 scfh
(11.8 - 18.9 lpm) for sufficient shielding gas coverage.
Gun angle, nozzle diameter, joint configuration and
wind conditions may effect the amount of shielding gas
required.
OPERATION
SCFH
10
20
30
40
50
60
70
80
SPINDLE BRAKE
Adjust the spindle brake tension to allow the spool to
spin freely, yet have enough resistance for little or no
overrun when wire feeding is stopped.
SHIELDING GAS CONNECTION
• Keep cylinder away from areas where it may be
damaged.
• Never lift welder with cylinder attached.
• Never allow welding electrode to touch cylinder.
• Keep cylinder away from welding or other live
electrical circuits.
-----------------------------------------------------------------------
• BUILD UP OF SHIELDING GAS MAY HARM
HEALTH OR KILL.
• Shut off shielding gas supply when not in use.
• See American National Standard Z-49.1, "Safety
in Welding and Cutting" Published by the
American Welding Society.
------------------------------------------------------------------------
Customer must provide a cylinder of shielding gas, a
pressure regulator, a flow control valve and a hose
from the flow valve to the gas inlet fitting of the LN-15.
Connect a supply hose from the gas cylinder flow valve
outlet to the 5/8-18 female inert gas fitting on the back
of the LN-15.
LN-15
Liter/Min.
4.7
9.4
14.2
18.9
23.6
28.3
33.1
37.8
WARNING
CYLINDER may explode if
damaged.
• Keep cylinder upright and
chained to support.
WARNING
B-8