Case Front Controls; Wire Feed Speed Knob; Thermal Led, Motor Overload - Lincoln Electric LN-25 Service Manual

B-4

CASE FRONT CONTROLS

(See Figure B.1)
FIGURE B.1
1
2
3
4
5
6
ITEM DESCRIPTION
1 Wire Feed Speed/Amperage Display
2 Wire Feed Speed LED
3 Amperage LED
4

Wire Feed Speed Knob

5 5 pin gun trigger connector
6 Work Clip Connection
7 Thermal LED
8 Voltage Display
9 Voltage LED
10 Set-up Push Button
OPERATION
WIRE FEED SPEED KNOB
WIRE FEED SPEED, CV OPERATION
When Across the Arc models are operated with CV
power sources, the wire feed speed will remain a con-
stant value, independent of arc voltage changes, as
along as the arc voltage does not drop below the val-
7
ues per the following table.
83% WIRE FEED SPEED
8
The 83% wire feed speed reduces the wire feed speed
to 83% of the original set value when activated. For
example, if the original wfs = 200 in/min, the feeder will
9
regulate to 0.83 x 200 = 166 in/min.
The 83% trigger requires a gun with a dual procedure
10
switch.
This feature is often useful when welding pipe, and a
"cooler" procedure is required on the bottom portion.
Minimum Arc Volts
15 V
17 V
21 V
24 V
27 V
THERMAL LED, MOTOR
OVERLOAD
The thermal light illuminates when the wire drive motor
draws too much current. If the thermal light illumi-
nates, the wire drive will automatically shutdown for up
to 30 seconds to allow the motor to cool. To start weld-
ing again, release the gun trigger, inspect the gun
cable, liner (and conduit). Clean and make repairs as
necessary. Start welding again when the problem has
been safely resolved.
For best results, keep the gun cable and conduit as
straight as possible. Perform regular maintenance and
cleaning on the gun liner, conduit and gun. Always use
quality electrode, such as L-50 or L-56 from Lincoln
Electric.
LN-25™ PIPE
CV OPERATION
Maximum WFS
Standard Spin
Gearing
280
340
440
520
600
B-4
M M