Operation, Caution – Lincoln Electric LN-25 SVM179-B User Manual
Page 24
OPERATION
B-10
B-10
LN-25™ PRO
INTERNAL CONTROLS DESCRIPTION
2 STEP - TRIGGER INTERLOCK
SWITCH
The 2 Step - Trigger Interlock
switch changes the function of the
gun trigger. 2 Step trigger opera-
tion turns welding on and off in
direct response to the trigger.
Trigger Interlock operation allows
welding to continue when the trig-
ger is released for comfort on long
welds.
Place the toggle switch in the DOWN position for 2
Step operation or in the UP 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.
If the arc goes out while welding with
trigger interlock operation, the elec-
trode output from the welding power
source remains energized and the wire
feeder will continue to feed wire until
the gun trigger is again pulled and
then released.
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CV/CC SWITCH
(See Figure B.4)
The CV/CC switch sets the wire
feed speed control method for the
wire feeder.
In the CV position, the wire feed
speed remains constant during
welding. A steady arc voltage is
regulated by the power source by
adjusting the arc current.
In the CC position, the wire feed
speed varies during welding. The
arc length is maintained by chang-
ing the wire feed speed.
COLD FEED PUSHBUTTON
When cold feeding, the wire drive
will feed electrode but neither the
power source nor the gas solenoid
will be energized. Adjust the speed
of cold feeding by rotating the WFS
knob. Cold feeding, or “cold inching”
the electrode is useful for threading
the electrode through the gun.
CV
CC
CAUTION