Lincoln Electric IM677 RED-D-ARC LN-25 - Manual (Page 23)

LN-25
D-1 D-1
ELECTRIC SHOCK can kill.
• Do not operate with covers
removed.
• Turn off power source before
installing or servicing.
• Do not touch electrically hot
parts.
• Turn the input power to the
welding power source off at
the fuse box before working
in the terminal strip.
• Only qualified personnel
should install, use or ser-
vice this equipment.
CIRCUIT PROTECTION AND
AUTOMATIC SHUTDOWN
CONTROL PC BOARD
The Control P.C. Board has electronic protection for
trigger circuit faults to the electrode circuit.
AUTOMATIC PROTECTION SHUTDOWN
(See Automatic Protection Shutdown Section.)
ADJUSTING SPEED
SENSOR MODULE
The LN-25 Speed Sensor Module is a three lead Hall
Effect switch device encased in an externally threaded
housing which is screwed into a mounting plate on the
motor side of the wire drive gearbox.
Proper positioning of this module is critical to proper
operation of the LN-25 wire feed speed control. If the
device is not screwed in far enough, the LN-25 motor
speed could be unstable or run at full speed with no
control. If screwed in too far, it will rub a moving part
inside the gearbox.
ROUTINE MAINTENANCE
DRIVE ROLLS AND GUIDE TUBES
After feeding every coil of wire, inspect the drive roll
section. Clean it as necessary. Do not use a solvent
for cleaning the idle roll because it may wash the lu-
bricant out of the bearing. The drive roll, idle roll and
guide tubes are stamped with the wire sizes they will
feed. If a wire size other than that stamped on the rolls
is to be used, the rolls and guide tubes must be
changed.
The drive rolls for .035 through .052 cored electrode
and
1 ⁄
16
through 5 ⁄
64
electrode have a double set of teeth
so they can be reversed for additional life. Drive rolls
for .023 through .052 solid electrode and aluminum
sizes have no teeth but use two grooves so they also
can be reversed for additional life.
See Wire Feed Drive Roll and Guide Tube Kits Sec-
tion for roll changing instructions.
WIRE REEL SPINDLE
No routine maintenance required. Do not lubricate
spindle.
WARNING
SAFETY PRECAUTIONS
CONTROL BOX
Every six months open and inspect the control sec-
tion. The accumulated dirt should be gently blown off
all of the electrical components. Be sure the air that
is being used is dry. Check that lead plugs are secure
in their receptacles.
WIRE DRIVE MOTOR AND GEAR BOX
Every year examine the gear box. Paint the gear teeth
with molydisulfide filled grease. Lincoln specification
E2322.
Do not use a graphite grease.
Check the motor brushes. Replace if they are worn
down to
1 ⁄
4
’’ or less. When ordering feed motor
b r u s h e s , g i v e a l l i n f o r m a t i o n f r o m t h e motor
nameplate.
GUN AND CABLE MAINTENANCE
See IM manual provided with the gun and cable as-
sembly.
MAINTENANCE