LN-35 CV/CC
RETURN TO MAIN MENU
SEMIAUTOMATIC WIRE FEEDER
IM812-A
January, 2005
For use with machines having Code Numbers:
Safety Depends on You
Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However, your
overall safety can be increased by
proper installation ... and thoughtful operation on your part. DO
NOT INSTALL, OPERATE OR
REPAIR THIS EQUIPMENT
WITHOUT READING THIS
MANUAL AND THE SAFETY
PRECAUTIONS CONTAINED
THROUGHOUT. And, most
importantly, think before you act
and be careful.
11029, 11250
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com
OPERATOR’S MANUAL
Copyright © 2005 Lincoln Global Inc.
• World's Leader in Welding and Cutting Products •
• Sales and Service through Subsidiaries and Distributors Worldwide •
i
SAFETY
i
WARNING
CALIFORNIA PROPOSITION 65 WARNINGS
Diesel engine exhaust and some of its constituents
are known to the State of California to cause cancer, birth defects, and other reproductive harm.
The Above For Diesel Engines
ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH.
KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.
Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you
purchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box
351040, Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available
from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.
BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE
PERFORMED ONLY BY QUALIFIED INDIVIDUALS.
The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.
The Above For Gasoline Engines
FOR ENGINE
powered equipment.
1.a. Turn the engine off before troubleshooting and maintenance
work unless the maintenance work requires it to be running.
____________________________________________________
1.b. Operate engines in open, well-ventilated
areas or vent the engine exhaust fumes
outdoors.
____________________________________________________
1.c. Do not add the fuel near an open flame
welding arc or when the engine is running.
Stop the engine and allow it to cool before
refueling to prevent spilled fuel from vaporizing on contact with hot engine parts and
igniting. Do not spill fuel when filling tank. If
fuel is spilled, wipe it up and do not start
engine until fumes have been eliminated.
____________________________________________________
1.d. Keep all equipment safety guards, covers and devices in
position and in good repair.Keep hands, hair, clothing and
tools away from V-belts, gears, fans and all other moving
parts when starting, operating or repairing equipment.
____________________________________________________
1.e. In some cases it may be necessary to remove safety
guards to perform required maintenance. Remove
guards only when necessary and replace them when the
maintenance requiring their removal is complete.
Always use the greatest care when working near moving
parts.
___________________________________________________
1.f. Do not put your hands near the engine fan.
Do not attempt to override the governor or
idler by pushing on the throttle control rods
while the engine is running.
1.h. To avoid scalding, do not remove the
radiator pressure cap when the engine is
hot.
ELECTRIC AND
MAGNETIC FIELDS
may be dangerous
2.a. Electric current flowing through any conductor causes
localized Electric and Magnetic Fields (EMF). Welding
current creates EMF fields around welding cables and
welding machines
2.b. EMF fields may interfere with some pacemakers, and
welders having a pacemaker should consult their physician
before welding.
2.c. Exposure to EMF fields in welding may have other health
effects which are now not known.
2.d. All welders should use the following procedures in order to
minimize exposure to EMF fields from the welding circuit:
2.d.1.
Route the electrode and work cables together - Secure
them with tape when possible.
2.d.2. Never coil the electrode lead around your body.
2.d.3. Do not place your body between the electrode and
work cables. If the electrode cable is on your right
side, the work cable should also be on your right side.
___________________________________________________
1.g. To prevent accidentally starting gasoline engines while
turning the engine or welding generator during maintenance
work, disconnect the spark plug wires, distributor cap or
magneto wire as appropriate.
2.d.4. Connect the work cable to the workpiece as close as
possible to the area being welded.
2.d.5. Do not work next to welding power source.
Mar ‘95
ii
SAFETY
ii
ELECTRIC SHOCK can
kill.
3.a. The electrode and work (or ground) circuits
are electrically “hot” when the welder is on.
Do not touch these “hot” parts with your bare
skin or wet clothing. Wear dry, hole-free
gloves to insulate hands.
3.b. Insulate yourself from work and ground using dry insulation.
Make certain the insulation is large enough to cover your full
area of physical contact with work and ground.
In addition to the normal safety precautions, if welding
must be performed under electrically hazardous
conditions (in damp locations or while wearing wet
clothing; on metal structures such as floors, gratings or
scaffolds; when in cramped positions such as sitting,
kneeling or lying, if there is a high risk of unavoidable or
accidental contact with the workpiece or ground) use
the following equipment:
• Semiautomatic DC Constant Voltage (Wire) Welder.
• DC Manual (Stick) Welder.
• AC Welder with Reduced Voltage Control.
3.c. In semiautomatic or automatic wire welding, the electrode,
electrode reel, welding head, nozzle or semiautomatic
welding gun are also electrically “hot”.
3.d. Always be sure the work cable makes a good electrical
connection with the metal being welded. The connection
should be as close as possible to the area being welded.
3.e. Ground the work or metal to be welded to a good electrical
(earth) ground.
ARC RAYS can burn.
4.a. Use a shield with the proper filter and cover
plates to protect your eyes from sparks and
the rays of the arc when welding or observing
open arc welding. Headshield and filter lens
should conform to ANSI Z87. I standards.
4.b. Use suitable clothing made from durable flame-resistant
material to protect your skin and that of your helpers from
the arc rays.
4.c. Protect other nearby personnel with suitable, non-flammable
screening and/or warn them not to watch the arc nor expose
themselves to the arc rays or to hot spatter or metal.
FUMES AND GASES
can be dangerous.
5.a. Welding may produce fumes and gases
hazardous to health. Avoid breathing these
fumes and gases.When welding, keep
your head out of the fume. Use enough
ventilation and/or exhaust at the arc to keep
fumes and gases away from the breathing zone. When
welding with electrodes which require special
ventilation such as stainless or hard facing (see
instructions on container or MSDS) or on lead or
cadmium plated steel and other metals or coatings
which produce highly toxic fumes, keep exposure as
low as possible and below Threshold Limit Values (TLV)
using local exhaust or mechanical ventilation. In
confined spaces or in some circumstances, outdoors, a
respirator may be required. Additional precautions are
also required when welding on galvanized steel.
3.f.
Maintain the electrode holder, work clamp, welding cable and
welding machine in good, safe operating condition. Replace
damaged insulation.
3.g. Never dip the electrode in water for cooling.
3.h. Never simultaneously touch electrically “hot” parts of
electrode holders connected to two welders because voltage
between the two can be the total of the open circuit voltage
of both welders.
3.i. When working above floor level, use a safety belt to protect
yourself from a fall should you get a shock.
3.j. Also see Items 6.c. and 8.
5.b.
Do not weld in locations near chlorinated hydrocarbon
coming from degreasing, cleaning or spraying operations.
The heat and rays of the arc can react with solvent vapors
form phosgene, a highly toxic gas, and other irritating products.
5.c. Shielding gases used for arc welding can displace air and
cause injury or death. Always use enough ventilation,
especially in confined areas, to insure breathing air is safe.
5.d. Read and understand the manufacturer’s instructions for this
equipment and the consumables to be used, including the
material safety data sheet (MSDS) and follow your
employer’s safety practices. MSDS forms are available from
your welding distributor or from the manufacturer.
5.e. Also see item 1.b.
vapors
Mar ‘95
to
iii
SAFETY
iii
WELDING SPARKS can
cause fire or explosion.
6.a.
Remove fire hazards from the welding area.
If this is not possible, cover them to prevent
the welding sparks from starting a fire.
materials from welding can easily go through small cracks
and openings to adjacent areas. Avoid welding near
hydraulic lines. Have a fire extinguisher readily available.
6.b. Where compressed gases are to be used at the job site,
special precautions should be used to prevent hazardous
situations. Refer to “Safety in Welding and Cutting” (ANSI
Standard Z49.1) and the operating information for the
equipment being used.
6.c. When not welding, make certain no part of the electrode
circuit is touching the work or ground. Accidental contact
can cause overheating and create a fire hazard.
6.d. Do not heat, cut or weld tanks, drums or containers until the
proper steps have been taken to insure that such procedures
will not cause flammable or toxic vapors from substances
inside. They can cause an explosion even
been “cleaned”. For information, purchase “Recommended
Safe Practices for the
Containers and Piping That Have Held Hazardous
Substances”, AWS F4.1 from the American Welding Society
(see address above).
6.e. Vent hollow castings or containers before heating, cutting or
welding. They may explode.
Sparks and spatter are thrown from the welding arc. Wear oil
6.f.
free protective garments such as leather gloves, heavy shirt,
cuffless trousers, high shoes and a cap over your hair. Wear
ear plugs when welding out of position or in confined places.
Always wear safety glasses with side shields when in a
welding area.
6.g. Connect the work cable to the work as close to the welding
area as practical. Work cables connected to the building
framework or other locations away from the welding area
increase the possibility of the welding current passing
through lifting chains, crane cables or other alternate circuits. This can create fire hazards or overheat lifting chains
or cables until they fail.
6.h. Also see item 1.c.
Remember that welding sparks and hot
though
they have
Preparation
for Welding and Cutting of
CYLINDER may explode
if damaged.
7.a. Use only compressed gas cylinders
containing the correct shielding gas for the
process used and properly operating
regulators designed for the gas and
pressure used. All hoses, fittings, etc. should be suitable for
the application and maintained in good condition.
7.b. Always keep cylinders in an upright position securely
chained to an undercarriage or fixed support.
7.c. Cylinders should be located:
• Away from areas where they may be struck or subjected to
physical damage.
• A safe distance from arc welding or cutting operations and
any other source of heat, sparks, or flame.
7.d. Never allow the electrode, electrode holder or any other
electrically “hot” parts to touch a cylinder.
7.e. Keep your head and face away from the cylinder valve outlet
when opening the cylinder valve.
7.f. Valve protection caps should always be in place and hand
tight except when the cylinder is in use or connected for
use.
7.g. Read and follow the instructions on compressed gas
cylinders, associated equipment, and CGA publication P-l,
“Precautions for Safe Handling of Compressed Gases in
Cylinders,” available from the Compressed Gas Association
1235 Jefferson Davis Highway, Arlington, VA 22202.
FOR ELECTRICALLY
powered equipment.
8.a. Turn off input power using the disconnect
switch at the fuse box before working on
the equipment.
8.b. Install equipment in accordance with the U.S. National
Electrical Code, all local codes and the manufacturer’s
recommendations.
8.c. Ground the equipment in accordance with the U.S. National
Electrical Code and the manufacturer’s recommendations.
Mar ‘95
iv
SAFETY
iv
PRÉCAUTIONS DE SÛRETÉ
Pour votre propre protection lire et observer toutes les instructions
et les précautions de sûreté specifiques qui parraissent dans ce
manuel aussi bien que les précautions de sûreté générales suivantes:
Sûreté Pour Soudage A L’Arc
1. Protegez-vous contre la secousse électrique:
a. Les circuits à l’électrode et à la piéce sont sous tension
quand la machine à souder est en marche. Eviter toujours
tout contact entre les parties sous tension et la peau nue
ou les vétements mouillés. Porter des gants secs et sans
trous pour isoler les mains.
b. Faire trés attention de bien s’isoler de la masse quand on
soude dans des endroits humides, ou sur un plancher
metallique ou des grilles metalliques, principalement dans
les positions assis ou couché pour lesquelles une grande
partie du corps peut être en contact avec la masse.
c. Maintenir le porte-électrode, la pince de masse, le câble
de soudage et la machine à souder en bon et sûr état
defonctionnement.
d.Ne jamais plonger le porte-électrode dans l’eau pour le
refroidir.
e. Ne jamais toucher simultanément les parties sous tension
des porte-électrodes connectés à deux machines à souder
parce que la tension entre les deux pinces peut être le
total de la tension à vide des deux machines.
f. Si on utilise la machine à souder comme une source de
courant pour soudage semi-automatique, ces precautions
pour le porte-électrode s’applicuent aussi au pistolet de
soudage.
2. Dans le cas de travail au dessus du niveau du sol, se protéger
contre les chutes dans le cas ou on recoit un choc. Ne jamais
enrouler le câble-électrode autour de n’importe quelle partie
du corps.
5. Toujours porter des lunettes de sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones où l’on pique le laitier.
6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque d’incendie dû aux étincelles.
7. Quand on ne soude pas, poser la pince à une endroit isolé de
la masse. Un court-circuit accidental peut provoquer un
échauffement et un risque d’incendie.
8. S’assurer que la masse est connectée le plus prés possible
de la zone de travail qu’il est pratique de le faire. Si on place
la masse sur la charpente de la construction ou d’autres
endroits éloignés de la zone de travail, on augmente le risque
de voir passer le courant de soudage par les chaines de levage, câbles de grue, ou autres circuits. Cela peut provoquer
des risques d’incendie ou d’echauffement des chaines et des
câbles jusqu’à ce qu’ils se rompent.
9. Assurer une ventilation suffisante dans la zone de soudage.
Ceci est particuliérement important pour le soudage de tôles
galvanisées plombées, ou cadmiées ou tout autre métal qui
produit des fumeés toxiques.
10. Ne pas souder en présence de vapeurs de chlore provenant
d’opérations de dégraissage, nettoyage ou pistolage. La
chaleur ou les rayons de l’arc peuvent réagir avec les vapeurs
du solvant pour produire du phosgéne (gas fortement toxique)
ou autres produits irritants.
11. Pour obtenir de plus amples renseignements sur la sûreté,
voir le code “Code for safety in welding and cutting” CSA
Standard W 117.2-1974.
PRÉCAUTIONS DE SÛRETÉ POUR
3. Un coup d’arc peut être plus sévère qu’un coup de soliel,
donc:
a. Utiliser un bon masque avec un verre filtrant approprié
ainsi qu’un verre blanc afin de se protéger les yeux du rayonnement de l’arc et des projections quand on soude ou
quand on regarde l’arc.
b. Porter des vêtements convenables afin de protéger la
peau de soudeur et des aides contre le rayonnement de
l‘arc.
c. Protéger l’autre personnel travaillant à proximité au
soudage à l’aide d’écrans appropriés et non-inflammables.
4. Des gouttes de laitier en fusion sont émises de l’arc de
soudage. Se protéger avec des vêtements de protection libres
de l’huile, tels que les gants en cuir, chemise épaisse, pantalons sans revers, et chaussures montantes.
LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR
1. Relier à la terre le chassis du poste conformement au code de
l’électricité et aux recommendations du fabricant. Le dispositif
de montage ou la piece à souder doit être branché à une
bonne mise à la terre.
2. Autant que possible, I’installation et l’entretien du poste seront
effectués par un électricien qualifié.
3. Avant de faires des travaux à l’interieur de poste, la debrancher à l’interrupteur à la boite de fusibles.
4. Garder tous les couvercles et dispositifs de sûreté à leur
place.
Mar. ‘93
for selecting a QUALITY product by Lincoln Electric. We want you
Thank You
to take pride in operating this Lincoln Electric Company product
••• as much pride as we have in bringing this product to you!
Please Examine Carton and Equipment For Damage Immediately
When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims
for material damaged in shipment must be made by the purchaser against the transportation company at the
time the shipment is received.
Please record your equipment identification information below for future reference. This information can be
found on your machine nameplate.
Product _________________________________________________________________________________
Model Number ___________________________________________________________________________
Code Number or Date Code_________________________________________________________________
Serial Number____________________________________________________________________________
Date Purchased___________________________________________________________________________
vv
Where Purchased_________________________________________________________________________
Whenever you request replacement parts or information on this equipment, always supply the information you
have recorded above. The code number is especially important when identifying the correct replacement parts.
On-Line Product Registration
- Register your machine with Lincoln Electric either via fax or over the Internet.
• For faxing: Complete the form on the back of the warranty statement included in the literature packet
accompanying this machine and fax the form per the instructions printed on it.
• For On-Line Registration: Go to our
“Product Registration”. Please complete the form and submit your registration.
Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it
handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.
The level of seriousness to be applied to each is explained below:
WEB SITE at www.lincolnelectric.com. Choose “Quick Links” and then
WARNING
This statement appears where the information must be followed exactly to avoid serious personal injury or
loss of life.
CAUTION
This statement appears where the information must be followed to avoid minor personal injury or damage to
this equipment.
vi
INSTALLATION SECTION ......................................................................................................................A
Technical Specifications.....................................................................................................................A-1
Safety Precautions .............................................................................................................................A-2
Power Source Connections................................................................................................................A-2
Gun Cable Connection to Feeder ......................................................................................................A-3
Weld Cable Connection......................................................................................................................A-4
Electrode Cable Connection ..........................................................................................................A-4
Work Cable Connection .................................................................................................................A-4
Drive Roll Installation .........................................................................................................................A-4
______________________________________________________________________________________
OPERATION ............................................................................................................................SECTION B
Safety Precautions .............................................................................................................................B-1
General Description............................................................................................................................B-1
Recommended Processes and Equipment ........................................................................................B-1
Welding Capability .............................................................................................................................B-1
LN-35 Instruments and Controls .......................................................................................................B-1
Work Clip Lead ..................................................................................................................................B-2
Wire reel Loading-50 and 60 LB. .......................................................................................................B-2
Loading Wire Drive ........................................................................................................................B-3
Idle Roll Pressure Setting ..............................................................................................................B-3
Presetting Wire Feed Speed ..........................................................................................................B-4
Making a Weld ...............................................................................................................................B-5
Procedure at End of Coil....................................................................................................................B-6
Open Arc Welding with a Constant Current .......................................................................................B-6
Automatic Protection Shutdown .........................................................................................................B-7
_______________________________________________________________________________________
TABLE OF CONTENTS
Page
vi
MAINTENANCE .......................................................................................................................SECTION D
Safety Precautions.............................................................................................................................D-1
Routine Maintenance .........................................................................................................................D-1
Circuit Protection and Automatic Shutdown.......................................................................................D-1
Adjusting Speed Sensor Module........................................................................................................D-2
Calibration of the LN-35 Wire Speed Dial..........................................................................................D-2
_______________________________________________________________________________________
TROUBLESHOOTING GUIDE .................................................................................................SECTION E
How to Use the Troubleshooting Guide .............................................................................................E-1
Troubleshooting Guide.................................................................................................................E-2,E-3
_______________________________________________________________________________________
WIRING DIAGRAMS..............................................................................................................................F-1
_______________________________________________________________________________________
A-1
RATED CCURRENT
WIRE FFEED SSPEED
PHYSICAL DIMENSIONS
WIRE DDIAMETER
VOLTAGE
INSTALLATION
TECHNICAL SPECIFICATIONS – LN-35 (K2281-1)
A-1
OPERATING ARC VOLTAGE
Constant Voltage (CV)
or 15-40 VDC (110VDC Maximum OCV)
Constant Current (CC)
Rated current 500 Amps 60% Duty Cycle
50 – 500 Inches Per Minute (IPM) (1270-12700 mm/Min.)
RECOMMENDED ELECTRODE WIRE SIZES
7/64 Inches
(2.78 mm) CORED WIRE
RATED CURRENT
WIRE SPEED RANGE
PHYSICAL DIMENSIONS
HEIGHT WIDTH DEPTH WEIGHT
27 Inches 14.25 Inches 33 Inches 82 lbs
(686 mm) (362 mm) (838 mm) (37 kg)
TEMPERATURE RANGE
OPERATION: - 40oC to +40oC (- 40oF to +104oF)
STORAGE: - 40oC to +85oC (- 40oF to +185oF)
LN-35
A-2
INSTALLATION
A-2
SAFETY PRECAUTIONS
WARNING
The electrode circuit (including welding wire, wire
drive and welding gun) is electrically hot when the
welding power source is on. The gun trigger controls
wire feed only.
Disconnect or shut off welding power source before
making connections or installations to the LN-35.
The LN-35 should be positioned upright on a
horizontal surface.
WARNING
ELECTRIC SHOCK can kill.
• Do not touch metal portions
of the LN-35 clamp when
welding power source is on.
WARNING
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 service this
equipment.
DC-250
a. Connect a jumper from 2 to 4 on the power source
terminal strip so the output will be energized when
the DC-250 is turned on.
POWER SOURCE CONNECTION
The LN-35 can be used with any DC welding power
source. A constant voltage power source is
recommended; however, the LN-35 can also be used
with a constant current power source as long as the
open circuit voltage is less than 110V DC.
The power source output will be electrically “hot” at
all times when the power source is turned on.
See the power source instruction manual for proper
power source connections and setting required.
b. Connect electrode cable to the “Innershield/
GMAW” output terminal of polarity required by
electrode. Connect work lead to other
“Innershield/GMAW” output terminal.
c. Place “Set to CV Electrode Cable Polarity” switch
at appropriate position.
d. Place power source toggle switch in “Output
Control at DC-250” position, unless a Remote
Control is connected to 75, 76 and 77 on the DC250 terminal strip.
e. Place mode switch in “Innershield GMAW (CV)”
position. Set CV arc control to “2” (or “NORMAL”
on some machines). Initially set the output
control on “7”.
DC-400 AND CV-400
a. Connect a jumper from 2 to 4 on the power
source terminal strip so the output will be
energized when the power source is turned on.
NOTE: DC-400 machines above Code 9200 have
an output toggle switch to perform this function.
b. Connect the electrode cable to the output
terminal of polarity required by electrode.
Connect work lead to other output terminal.
LN-35
A-3
c. Place “Set to Same Polarity As Electrode Cable
Connection” switch at appropriate position.
INSTALLATION
A-3
c. Set ELECTRODE POLARITY switch to constant
voltage polarity required by electrode.
d. Place power source toggle switch in “Output
Control at DC(CV) -400” position, unless a
remote control is connected to 75, 76 and 77 on
the power source terminal strip.
e. If power source has a mode switch, set switch to
Constant Voltage Innershield. Initially set the
output control on “6”.
DC-600
a. Connect a jumper from 2 to 4 on the power
source terminal strip so the output will be
energized when the DC-600 is turned on. (For
DC-600 below Code 8200, also jumper N to S.)
b. Connect the electrode cable to the output
terminal of polarity required by electrode.
Connect work lead to other output terminal.
c. Place “Set to Same Polarity As Electrode Cable
Connection” switch at appropriate position.
d. Place power source toggle switch in “Output
Control at DC-600” position, unless a remote
control is connected to 75, 76 and 77 on the DC600 terminal strip.
e. Set mode switch to Constant Voltage Innershield.
Initially set output control on “4”.
R3S-325
a. Connect a jumper from 4 to 32 on the power
source terminal strip so that the output will be
energized when the R3S-325 is turned on.
d. Set toggle switch to “Constant Voltage” and set
the Constant Voltage Control on welder and the
portable field control on #5 for initial start.
SA-200, —250 OR SAE-300, —400 (WITH
CV ADAPTER)
a. For electrode negative welding, connect the
electrode lead from the LN-35 to the output
terminal on the CV Adapter, and the work lead to
the power source output terminal labeled
“POSITIVE”. For electrode positive welding,
interchange the above lead connections so the
LN-35 electrode lead is then connected to the
positive power source terminal.
b. Place both switches on the CV Adapter to the CV
INNERSHIELD position and make appropriate
power source settings per the CV Adapter instructions provided for the power source being used.
c. The output voltage is set with the voltage control
on the CV Adapter.
NOTE: Refer to the Instruction Manual provided with
the machine for details on connection and operation
of the LN-35 with the power source.
INVERTEC, CV300 AND OTHER NEWER
LINCOLN POWER SOURCES
Refer to the instruction manual provided with the
power source for details on connection and operation
of the LN-35 with these newer machines.
b. Connect the electrode cable to the output
terminal of polarity required by electrode.
Connect work lead to other output terminal.
c. Set power source per its instruction manual.
NOTE: Use of the optional Line Voltage
Compensator available for the R3S-325 is
recommended if input line voltage variation
exceeds ±3%.
SAM-400, —650
a. Connect a jumper from 2 to C4 on the power
source terminal strip so the output will be
energized when the SAM power source is on.
b. Connect work lead to WORK stud. Connect
electrode to AUTO EQUIPMENT stud. Connect
SAM-650 “Tap” lead to the Innershield stud
desired.
GUN CABLE CONNECTION
TO FEEDER
Lay the cable out straight. Insert the connector on the
welding conductor cable into the brass conductor
block on the front of the wire drive unit. Make sure it is
all the way in and tighten the hand wheel clamp. Keep
this connection clean and bright. Connect the control
cable polarized amphenol plug into the mating 5-cavity
receptacle on the front panel of the wire feeder case.
LN-35
A-4
INSTALLATION
A-4
WELD CABLE CONNECTION
The size of the electrode cable and work cable must
be sufficient for the maximum weld current and total
cable length to be used. Refer to table A.1.
TABLE A.1
Weld Current
60% Duty Cycle 50’-100’ 100’-150’ 150’-200’ 200’-250’
200Amps 2 AWG 2 AWG 1 AWG 1/0
300Amps 1 AWG 1 AWG 1/0 2/0
400Amps 2/0 2/0 3/0 3/0
500Amps 2/0 3/0 3/0 4/0
Total Cable Length
ELECTRODE CABLE CONNECTION
Route the electrode cable through the oval hole in
the LN-35 rear panel. Connect the electrode cable to
the LN-35 using the 12” bolt on the front of the wire
drive.
WORK CABLE CONNECTION
Connect a work lead of sufficient size between
the proper output stud on the power source and
the work. Be sure the connection to the work
makes tight metal-to-metal electrical contact.
Poor work lead connections can result in poor
welding performance.
DRIVE ROLL INSTALLATION
CHANGING DRIVE ROLLS FOR TWOROLL WIRE FEEDERS:
To change drive rolls on a two-roll wire feeder, refer
to Figure A.1 and perform the following steps:
FIGURE A.1 – INSTALLING DRIVE ROLLS ON A TWO-ROLL FEEDER.
1. Rotate the latch knob on the quick release
arm.
2. Remove the hex head screw and clamping
collar. Remove the drive roll from the shaft.
3. The new roll to be installed is stamped for the
size to be fed. An “A” after the size indicates
aluminum wire. Remove the rolls from the kit and
wipe them clean. Wipe the output shaft and
locating shoulder clean.
4. Use the drive key, clamping collar, and hex
head screw to install the roll on the output shaft.
Certain size drive rolls consist of two roll halves,
and may contain a spacer. If the drive roll you
are installing contains a spacer, the spacer fits
between the two halves of the drive roll. Tighten
the hex head screw.
5. Back out the guide tube clamping screws.
Remove the old guide tubes, if installed.
6. Insert the outgoing guide tube (the one with
the plastic insert) into the front hole. If the
guide tube has a non-symmetrical chisel end,
the larger radius must face the drive roll. See
Figure A.1. Push the guide tube back as far
as it will go and tighten the clamping screw.
Insert the incoming guide tube as far back as
it will go and tighten the clamping screw. The
clamping screws are dog points. When the
guide tubes are properly installed these dog
points will lock into the annular grooves in
each of the guide tubes.
7. Set the idle roll pressure as detailed in the Idle
Roll Pressure Setting procedure detailed later
in this section.
LN-35
B-1
OPERATION
SAFETY PRECAUTIONS
READ AND UNDERSTAND ENTIRE SECTION
BEFORE OPERATING MACHINE
WARNING
ELECTRIC SHOCK can kill.
• Do not touch electrically
live part or electrode with
skin or wet clothing.
B-1
The LN-35 provides constant wire feed speed for use
with constant voltage (CV) power sources, and arcsensing wire feed speed for use with constant current
(CC) (formerly variable voltage) power sources. Wire
speed is presettable on a calibrated dial.
The power sources recommended for use with the
LN-35 include the DC-250, -400, -600, CV-400 and
R3S type transformer machines, and the SAM-400,
-650 engine welders, as well as the SA-200, -250 or
SAE-300, -400 with CV Adapter.
WELDING CAPABILITY
• Insulate yourself from
work and ground.
• Always wear dry insulating gloves.
FUMES AND GASSES can
be dangerous.
• Keep your head out of
fumes.
• Use ventilation or exhaust
to remove fumes from
breathing zone.
WELDING SPARKS can
cause fire or explosion.
• Keep flammable material
away.
ARC RAYS can burn.
• Wear eye, ear and body
protection.
------------------------------------------------------------------
GENERAL DESCRIPTION
The LN-35 is a semiautomatic wire feeder designed
for “across-the-arc” operation without a control cable
on most any DC welding power source. Simply
connect the LN-35 to the electrode cable, clip it to
Work and it is ready to weld, using up to 60 lb. coils
or spools.
RECOMMENDED PROCESSES
AND EQUIPMENT
The LN-35 will handle up to 500 Amp 60% duty cycle
welding currents.
LN-35 INSTRUMENTS AND
CONTROLS
“ELECTRODE POLARITY” SWITCH
The polarity switch is located on the center panel
inside the LN-35 case.
Set the switch to the same polarity as the electrode
lead connection to the power source. If the switch is
not set for the correct polarity, the wire feeder will not
operate.
WIRE FEED MODE SWITCH
The CV-VV (CC) Wire Feed Mode switch is located
on the center panel inside the LN-35 case.
The forward “CV” switch position provides constant
wire feed speed mode for use with constant voltage
(CV) welding power sources.
The backward “VV (CC)” switch position provides arcsensing wire feed speed mode for use with constant
current (formerly variable voltage) welding power
sources.
WIRE FEED SPEED CONTROL
This control sets the feed speed of the wire feeder.
Turn the knob to the left for slower speeds and to the
right for higher speeds. The control is calibrated. The
nameplate shows the wire speed for the given setting
of the control.
When combined with the quality drive roll kits and
accessories available for use with the LN-35, a
versatile welding system can be provided to meet the
specific needs of Innershield or submerged arc
welding applications within the wire feed capabilities
of the LN-35.
LN-35
B-2
OPERATION
B-2
WORK CLIP LEAD
WARNING
ELECTRIC SHOCK can kill.
•Do not touch metal por-
tions of the LN-35 lead clip
when welding power
source is on.
WARNING
IMPORTANT SAFETY NOTE: To avoid possible
electrical shock, do not touch the metal portions
of the LN-35 work lead clamp if the power source
output is on. The clamp will be electrically “HOT”
to work if the input electrode cable to the LN-35 is
electrically “HOT” even if the gun trigger is off.
Care should be taken to only handle the LN-35
work clamp by its non-metal insulated portions
and/or the welding power source should be turned
off before handling the work clamp.
--------------------------------------------------------------------
TO MOUNT A 50 OR 60 LB COIL:
1. To remove the wire reel from its shaft.
2. Lay the reel flat on the floor. Loosen the spinner
nut and remove the cover plate. See Figure
B.1.
3. Place the coil of electrode on the reel so it
unwinds as the reel rotates clockwise. DO NOT
cut the tie wires at this time.
4. Be sure the coil is placed so the spring loaded
arms will not interfere with the later removal of
the coil tie wires.
5. When loading 0.030, 0.035, and 0.045”
electrode, be certain the coil is placed on the
reel so the spring loaded arms are at the center
of the slots in the cardboard coil liner. This
provides the positive compression of the coil
sides needed for trouble-free wire feeding.
6. Put the cover plate on the reel so the four arms
of the cover plate straddle and are in line with
the spring loaded arms of the reel.
7. Tighten the cover as much as possible by hand.
The 15 ft work clamp lead attached to the front panel
of the LN-35 case must be connected directly to the
work using the spring clamp on the end of the lead.
If not connected, the LN-35 will not operate. However,
the electrode will still be electrically “HOT” when the
clamp lead is disconnected.
WIRE REEL LOADING – 50 AND 60 LB
ADJUSTABLE WIRE REEL BRAKE
The mount for standard 50 and 60 pound electrode
coils includes a two-position brake assembly.
Generally the brake should be at the inner position
(nearest to the wire reel shaft) for wire feed speeds
below 400 in./min (10 m/min). It should be at the
outer position for the faster wire speeds often used
when feeding smaller diameter electrode.
To adjust the brake position, remove the wire reel.
Pull the cotter pin that holds the brake shoe to the
arm, move the shoe and replace the cotter pin. Do
not bend the cotter pin - it is held in place by a
friction fit.
CAUTION
DO NOT hammer on the spinner nut arms.
Always be sure the free end of the coil is
securely held while the tie wires are being cut
and until the wire is feeding through the drive
rolls. Failure to do this will result in “back
lashing” of the coil, which may tangle the wire.
A tangled coil will not feed. It must be untangled
or discarded.
-------------------------------------------------------------------
8. Cut and remove only the tie wire holding the
free end of the coil. Insert the free end into one
of the holes in the cover and secure it by
bending it back. Cut and remove the remaining
tie wires.
9. Replace the reel on the wire feeder.
LN-35
B-3
OPERATION
B-3
FIGURE B.1 – LOADING A 50 OR 60 LB COIL.
SPINNER
NUT
COVER
PLATE
SLOTS
CARDBOARD
COIL
LINER
COIL
TIE WIRE
REEL
SPRING
LOADED
ARM
e. Press the gun trigger and push the electrode until
it just enters the drive roll.
WARNING
When inching with gun trigger, the electrode and
drive mechanism are always “hot” to work and
ground.
---------------------------------------------------------------------
f. Inch the electrode through the gun.
IDLE ROLL PRESSURE SETTING
The idle roll pressure is set at the factory backed out
two turns from full pressure. This is an approximate
setting. The optimum idle roll setting can be
determined as follows:
1. Press end of gun against a solid object that is
electrically isolated from the welder output. Press
the gun trigger for several seconds.
2. If the wire “birdnests,” jams or breaks at the drive
roll, the idle roll pressure is too great. Back the
pressure setting out
gun, and repeat above steps.
1
2 turn, run new wire through
LOADING WIRE DRIVE
a. Turn the reel or spool until the free end of the
electrode is accessible.
b. While tightly holding the electrode, cut off the bent
end and straighten the first six inches. Cut off the
first inch. (If the electrode is not properly
straightened, it may not feed or may not go into
the outgoing guide tube causing a “birdnest”.)
c. Insert the free end through the incoming guide
tube to the drive roll.
d. Turn on the welding power source.
WARNING
The electrode circuit is electrically “hot” when the
power source is on.
------------------------------------------------------------------
3. If the only result is drive roll slippage, shut off the
power source, then loosen the gun cable
clamping screw in the gearbox conductor block
and pull the gun cable forward about six inches.
There should be a slight waviness in the exposed
wire. If there is no waviness, the pressure is too
low. Increase the pressure setting
gun cable in place and repeat the above steps.
1
4 turn, lock the
LN-35
B-4
OPERATION
PRESETTING WIRE FEED SPEED
The LN-35 permits accurate presetting of the desired
wire feed speed, before welding, in both CV and CC
wire feed modes.
SETTING CONSTANT WIRE FEED SPEED (CV
MODE)
a. Set Wire Feed Mode switch to CV position.
b. Set Wire Feed dial to the desired wire feed
speed on the selected calibrated dial range.
The wire speed will remain constant at the value set,
independent of arc voltage changes, as long as the
arc voltage does not drop below the value per the
chart below for the max. wire feed speed shown:
Maximum Speed Minimum Arc Volts
B-4
b. Referring to the graph shown in Figure B.3:
1. Select the horizontal line representing the DESIRED IN/MIN. for the welding procedure. (See
example arrow line for 375 in/min.)
2. Select the diagonal line representing the ARC
VOLTS to be used for the welding procedure.
(See example arrow line for 29 volts.)
3. Determine the vertical line representing the CC
WIRE SPEED SETTING where the above two
lines cross. (See example arrow line for 450.)
c. Set the Wire Speed dial to the value determined
in Step (3) above (450 for example used).
The wire will feed at the DESIRED IN/MIN speed
when the welding power source is set to the arc
voltage to be used for the weld procedure (375
in/min. at 29V for example used).
250 IPM 15V
280 IPM 17V
350 IPM 21V
SETTING ARC SENSING WIRE FEED SPEED
(VV [CC] MODE)
When using a constant current (formerly variable
voltage) power source, welding performance is improved using arc sensing wire feed speed (VV [CC]
mode). In this wire feed mode the wire speed
increases if arc voltage increases, and decreases if
arc voltage decreases, but remains constant at any
specific voltage level.
The LN-35 permits accurate VV (CC) mode
presetting of the desired wire feed speed, for the
desired arc voltage to be used, by setting the Wire
Speed dial in the following manner before welding:
a. Set Wire Feed Mode switch to VV (CC) position.
A chart representation of the VV (CC) wire speed
setting graph is shown in Figure B.4, giving the Wire
Speed dial setting required for the DESIRED IN/MIN
and ARC VOLTS used for the welding procedures:
FIGURE B.3 CC WIRE SPEED SETTING
LN-35
B-5
OPERATION
B-5
Desired
Arc Volts Used
In/Min 16 18 20 22 24 26 28 30 32 34
50 109 97 88 80 73 67 63 58 55 51
60 131 117 105 95 88 81 75 70 66 62
70 153 136 123 111 102 94 88 82 77 72
80 175 156 140 127 117 108 100 93 88 82
90 197 175 158 143 131 121 113 105 98 93
100 219 194 175 159 146 135 125 117 109 103
110 241 214 193 175 160 148 138 128 120 113
120 263 233 210 191 175 162 150 140 131 124
130 284 253 228 207 190 175 163 152 142 134
140 306 272 245 223 204 188 175 163 153 144
150 328 292 263 239 219 202 188 175 164 154
160 350 311 280 255 233 215 200 187 175 165
170 372 331 298 270 248 229 213 198 186 175
180 394 350 315 286 263 242 225 210 197 185
190 416 369 333 302 277 256 238 222 208 196
200 438 389 350 318 292 269 250 233 219 206
210 459 408 368 334 306 283 263 245 230 216
220 481 428 385 350 321 296 275 257 241 226
230 503 447 403 366 335 310 288 268 252 237
240 525 467 420 382 350 323 300 280 263 247
250 547 486 438 398 365 337 313 292 273 257
260 569 506 455 414 379 350 325 303 284 268
270 591 525 473 430 394 365 338 315 295 278
280 613 544 490 445 408 377 350 327 306 288
290 634 564 508 461 423 390 363 338 317 299
300 656 583 525 477 438 404 375 350 328 309
310 678 603 543 493 452 417 388 362 339 319
320 700 622 560 509 467 431 400 373 350 329
330 642 578 525 481 444 413 385 361 340
340 661 595 541 496 458 425 397 372 350
350 681 613 557 510 471 438 408 383 360
360 700 630 572 526 484 450 420 394 370
380 666 604 554 512 472 444 416 392
400 700 636 584 538 500 466 438 412
420 668 612 566 526 490 460 432
440 700 642 592 550 514 482 452
460 670 620 576 536 504 472
480 700 646 600 560 526 494
500 674 626 584 546 514
MAKING A WELD
SETUP
a. Connect work cable to metal to be welded. Work
cable must make good electrical contact to the
work. The work must also be grounded as stated
in “Arc Welding Safety Precautions.”
b. Check that the LN-35 is properly connected to the
power source for the polarity and process to be
used, and appropriate power source settings are
made for the procedure to be used. (Refer to
power source operating and connection
instructions.)
c. Place the LN-35 conveniently near the work area
in a location to minimize exposure to weld spatter
and to avoid sharp bends in the gun cable.
d. Connect the LN-35 Clamp Lead to work and set
Polarity Switch to same polarity as electrode.
e. Set WIRE FEED MODE switch to CV or CC, as
appropriate for the power source, then set the
proper DIAL RANGE and WIRE SPEED dial setting for the proper wire feed speed per the
welding procedure:
For CV: Set dial to the calibrated IN/MIN desired.
(Refer to Setting Constant Wire Feed Speed
Section.)
For CC: Set dial to value determined from the CC
Wire Speed Graph for the DESIRED IN/ MIN
and ARC VOLTS to be used. (Refer to Setting
Arc Sensing Wire Feed Speed Section.)
NOTE: If procedure permits a range of acceptable
arc voltage, use the middle of the range to
determine proper WIRE SPEED setting.
f. Be sure the proper contact tip for the wire size
being used is in the gun, and the gun is safe
from work contact.
VV (CC) Speed Setting =
Desired IPM
X 35
Arc Volts
FIGURE B.4 VV(CC) WIRE SPEED SETTING
g. Turn on the welding power source.
WARNING
The electrode is electrically “hot” when the power
source is on. The gun trigger controls wire feed
only.
---------------------------------------------------------------------
LN-35
B-6
WARNING
OPERATION
a. Shut off power source if a Remote Output Control
Option or internal contactor is not used.
B-6
CYLINDER may explode if
damaged.
• Keep cylinder upright and
chained to support.
• Keep cylinder away from
areas where it may be
damaged.
• Never lift welder with cylinder attached
• Never allow welding electrode to touch cylin-
der.
• Keep cylinder away from welding or other live
electrical circuits.
--------------------------------------------------------------------
WARNING
ARC RAYS can burn.
• Do not touch metal portions of the LN-35 lead
Clamp when welding
power source is on.
-----------------------------------------------------------------
a. Cut the electrode within approximately
3/8”(9.5mm) of the end of the contact tip for solid
wire and within approximately 3/4”(19.1mm) of the
extension guide for cored wire.
b. Position electrode over joint. End of electrode
should be slightly off the work.
c. Lower welding helmet, close gun trigger, and
begin welding. Hold the gun so the contact tip to
work distance gives the correct electrical stickout
as required for the procedure being used.
NOTE: If the arc voltage is not within the proper
procedure range adjust the power source output
control. (The CC mode WIRE SPEED setting should
not be changed from the preset procedure value for
the proper arc voltage.)
d. To stop welding, release the gun trigger and
then pull the gun away from the work.
PROCEDURE AT END OF COIL
b. Cut the end of the electrode off at the gun end.
Do not break it off by hand since this puts a slight
bend in the wire and makes it difficult or
impossible to pull it back through the nozzle.
c. Uncouple the gun conductor cable from
the LN-35.
d. Lay the cable out straight.
e. Using pliers to grip the wire, pull it out of the cable
from the connector end. Do not pull it from the
gun end.
f. Put the conductor cable back on wire drive unit
after the electrode has been removed.
g. Load a new coil of wire and feed it through the
cable as described in Loading Electrode Section.
OPEN ARC WELDING WITH A
CONSTANT CURRENT (formerly
variable voltage) POWER
SOURCE
Although a constant voltage (CV) power source
is recommended for Innershield
arc welding (GMAW), satisfactory general purpose
welding may be obtained using the LN-35 with
a constant current (CC) power source for noncritical commercial quality mild steel welding
applications.
While welding with a continuously fed electrode, weld
current variations are continuously taking place. There
are many causes for these variations, but
predominantly they occur due to changes in electrical
stickout (operator hand movements, nozzle tip contact
variations, etc.) and the dynamic metal transfer
characteristics of the process or procedure being used
(short arc, globular transfer, etc.).
When using a CV power source, these current
variations have essentially no effect on the welding
arc stability since CV power sources can provide a
wide range of weld current levels with virtually no
change in average arc voltage. These “flat slope” CV
power sources, therefore, provide the arc power
required to produce the best welding characteristics
and ease of operation for most open arc, constant wire
feed speed, welding processes.
®
and gas metal
When the wire on the reel is used up, the following
procedure is to be followed for removing the old wire
from the gun cable and loading a new reel.
LN-35
B-7
OPERATION
B-7
CC (formerly VV) power sources, on the other hand,
permit the arc voltage to decrease with increases in
welding current. The output characteristics of these
power sources can range from a “drooping slope,”
which provide minor arc voltage changes with weld
current variations, to “steep slope” which provide
broad voltage changes with only minor current
variations. The steeper the slope the more difficult it
becomes to maintain arc voltage stability with a
constant wire speed open arc process.
To aid in stabilizing the arc voltage when welding on
CC power sources the LN-35 is provided with a VV
(CC) wire feed mode. This arc voltage sensing feed
mode decreases (or increases) the wire speed when
the arc voltage decreases (or increases). However, if
the electrode shorts to the work, the arc voltage will
essentially drop to zero and the short circuit current
supplied by the CC power source may not provide
enough power to re-establish the arc (especially with
steeper slope machines). Under this condition the LN35 feeder will stop, as if the trigger was released,
and not restart until the short has been opened.
Arc shorting is more difficult to avoid when using
a CC power source, and requires a more refined
operator technique than when using a CV power
source. Improved performance can be obtained
on CC power source applications within the
following guidelines:
AUTOMATIC PROTECTION
SHUTDOWN
The LN-35 control provides automatic electronic
protection circuits which shut down the LN-35 for
excessively high power source open circuit voltage or
excessive motor overload.
OVERVOLTAGE SHUTDOWN
If the power source open circuit voltage exceeds about
110-120 volts, the LN-35 will not operate until the
power source voltage drops below about 102-110
volts.
MOTOR OVERLOAD SHUTDOWN
If excessive motor overload occurs (due to prolonged
excessive feeding force, jammed drive rolls or shorted
motor leads), the LN-35 will shut down within a few
seconds after the overload occurs.
The shutdown will reset automatically when the gun
trigger is released, but will reoccur if the overload
situation is not remedied.
1. Flatter slope power sources with higher arc force
(short circuit current) will improve performance
over steep slope machines. The steeper the
slope, the more critical it is to hold proper
electrode stickout to maintain arc stability.
Welding techniques, such as weaving, will be
more difficult to control. Use the highest output
current tap or setting capable of providing the
voltage adjustment required for the procedure.
LN-35
D-1
MAINTENANCE
D-1
SAFETY PRECAUTIONS
WARNING
Have qualified personnel do the maintenance
work. Turn the engine off before working inside
the machine. In some cases, it may be
necessary to remove safety guards to perform
required maintenance. Remove guards only
when necessary and replace them when the
maintenance requiring their removal is
complete. Always use the greatest care when
working near moving parts.
Do not put your hands near the engine cooling
blower fan. If a problem cannot be corrected by
following the instructions, take the machine to
the nearest Lincoln Field Service Shop.
ELECTRIC SHOCK can kill.
•Do not operate with covers removed.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
•Turn the input power to the welding power source
off at the fuse box before working in the terminal
strip.
• Insulate yourself from work and ground
• Always wear dry insulating gloves.
See additional warning information
throughout this operator’s manual and
the Engine manual as well.
-----------------------------------------------------------
See Wire Feed Drive Roll and Guide Tube Kits Section for roll changing instructions.
WIRE REEL SPINDLE
No routine maintenance required. Do not lubricate
spindle.
CONTROL BOX
Every six months open and inspect the control section. 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 inch or less. When ordering feed motor
brushes, give all information from the motor
nameplate.
GUN AND CABLE MAINTENANCE
See IM manual provided with the gun and cable assembly.
CIRCUIT PROTECTION AND
AUTOMATIC SHUTDOWN
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 lubricant 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.
LN-35
CONTROL PC BOARD FUSE
On G1757-6 (or higher part no.) P.C. Boards the 1/8
amp fuse was replaced with electronic protection for
trigger circuit faults to electrode circuit.
On G1757-2 through -5 part no. PC boards, the 1/8
amp fuse interrupts the 500A lead to the trigger switch.
On G1757- 1 PC boards a 5 amp fuse was used to
interrupt the 667 lead. The LN-35 will not operate if
the fuse is blown.
AUTOMATIC PROTECTION SHUTDOWN
(See Automatic Protection Shutdown Section.)
D-2
ADJUSTING SPEED
SENSOR MODULE
MAINTENANCE
D-2
WARNING
The LN-35 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-35 wire feed speed control. If the
device is not screwed in far enough, the LN-35 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.
The module is properly mounted to the gearbox
as shipped from the factory. If the device is ever
removed or replaced, proper mounting technique is as
follows:
1. Be sure all power to the LN-35 is shut off at the
power source.
2. Check that the module mounting plate is screwed
securely to the side of the gearbox.
3. Gently screw the module into the mounting plate
until it just touches and stops against the rotating
part inside the gearbox.
Electrode will be electrically “hot”. Do not allow
fed wire to contact any metal common with
welding work.
--------------------------------------------------------------------
An alternate means to measure wire feed speed
is as follows:
a. Cut wire off at the end of the gun tip.
b. Press trigger to feed wire for exactly 30 seconds.
c. Cut fed wire off at the end of the gun tip and
accurately measure its length.
d. Multiply the measured length by 2 to obtain the
wire speed (IN/MIN).
e. Repeat above steps to assure repeatable accu-
racy.
4. Carefully slip speed knob onto potentiometer
shaft so it points precisely to the wire speed
measured in step 3, then secure the knob set
screw without disturbing the position. Recheck by
repeating step 3.
4. Back the module out 1/2 turn, then snug the
module lock nut without rotating the module
position. Do not overtighten lock nut.
CALIBRATION OF LN-35 WIRE
SPEED DIAL
Calibration of the LN-35 Wire Speed dial is achieved
by proper mounting of the dial knob to the speed
potentiometer shaft. Whenever the knob is removed,
the dial is recalibrated as follows:
NOTE: Knob set screw does not seat on shaft flat.
1. Be sure the Wire Speed potentiometer mounting
nut is securely tightened, then rotate the
potentiometer shaft so its flat faces about to the
100 mark on the calibrated dial.
2. Set WIRE FEED MODE switch to CV position.
3. Press gun trigger to feed wire and measure
the wire feed speed (IN/MIN) using a Portable
Digital Wire Feed Speed Meter (Lincoln K283).
Take at least two readings to assure repeatable accuracy.
Feed Speed Meter (Lincoln K283). Take at least
two readings to assure repeatable accuracy.
LN-35
E-1
TROUBLESHOOTING
HOW TO USE TROUBLESHOOTING GUIDE
WARNING
Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician and
machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical
Shock, please observe all safety notes and precautions detailed throughout this manual.
__________________________________________________________________________
E-1
This Troubleshooting Guide is provided to help you
locate and repair possible machine malfunctions.
Simply follow the three-step procedure listed below.
Step 1. LOCATE PROBLEM (SYMPTOM).
Look under the column labeled “PROBLEM (SYMPTOMS)”. This column describes possible symptoms
that the machine may exhibit. Find the listing that
best describes the symptom that the machine is
exhibiting.
Step 2. POSSIBLE CAUSE.
The second column labeled “POSSIBLE CAUSE” lists
the obvious external possibilities that may contribute
to the machine symptom.
Step 3. RECOMMENDED COURSE OF ACTION
This column provides a course of action for the
Possible Cause, generally it states to contact your
local Lincoln Authorized Field Service Facility.
If you do not understand or are unable to perform the
Recommended Course of Action safely, contact your
local Lincoln Authorized Field Service Facility.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
LN-35
E-2
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
TROUBLESHOOTING
POSSIBLE AREAS OF
MISADJUSTMENTS
E-2
RECOMMENDED
COURSE OF ACTION
No wire feed when gun trigger is
pulled.
Wire feeds for a short time but
stops feeding. When gun trigger is
released and retriggered wire
feeding starts but stops again.
Wire feeds OK, but stubs or stops
while welding.
1. Power source must be on and
open circuit voltage (OCV)
present at weld terminals.
2. LN-35 work clamp may not be
connected.
3. LN-35 polarity switch must match
electrode polarity.
4. Jumper plug on control or option
board may be loose or missing.
5. The power source O.C.V. must
be above 15 VDC. But not more
than 110 VDC.
6. The gun trigger may be faulty.Replace gun.
1. The drive motor may be
overloaded. Check the wire
feeding system. EX. Drive roll
tension, reel brake and gun
cable liner.
1. If the power source is a constant
current type supply the arc
voltage may be “dipping” below
15 VDC causing the LN-35 to
stop or hesitate.
2. Connect a constant voltage type
power supply to the LN-35.
3. Make sure wire-feed mode
switch (S3) is in the proper
position.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.
Rough wire feeding or wire not
feeding but drive rolls turning.
1. Gun cable kinked and/or twisted.
2. Wire jammed in gun and cable.
3. Incorrect size or installation
of drive roll and guide tubes.
4. Drive roll loose.
5. Gun cable dirty.
6. Worn drive roll.
7. Electrode rusty and/or dirty.
8. Worn nozzle or cable liner.
9. Partially flashed or melted
contact tip.
10. Incorrect idle roll pressure.
11. Wire reel brake tension set too
high.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
LN-35
E-3
PROBLEMS
(SYMPTOMS)
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
E-3
Variable or “hunting” arc.
Weld porosity, narrow and ropey
bead, or electrode stubbing into
plate when welding.
Motor feeds but there is no wire
feed speed control.
1. Worn and/or melted contact tip Replace.
2. Worn work cable or poor work
connection.
3. Loose electrode connect-ions. Check for loose or faulty
connections.
4. Wrong electrode polarity for
process being used.
1. Contaminated weld joint or
improper procedures. -Clean
joint and check procedure (wire
speed and all voltage).
1. Make sure all molex plugs and
leads are securely connected to
the control board.
2. Check speed sensor - see
maintenance section.
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Lincoln Authorized
Field Service Facility.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
LN-35
F-1
DIAGRAMS
CR35795
1-06-05
F-1
L12032
3
621
WIRING DIAGRAM - LN-35
A.
N.
13
}
4
121014
1
324
5
8
6
11
*
*
J3
J14
6
7
1
5
4
9
CONTROL
P.C. BOARD
5
12
7
14
13
9
*
J4
11 2
8
2
3
8
10
N.A.
10
4
1
6
3
RED
512
BLUE
555
500
BLACK
BLACK
541
WHITE
539
631
524
523
633
522
523
632
509
CV
509
523
S3
524
WIRE FEED
MODE SWITCH
V V
7
9
15
16
*
*
J2
J1
}
2
1
2
4
1
3
667
622A
500A
N.B.
N.F.
BLACK
NEG
POS
S1
POLARITY
667
SWITCH
621
667
621
631
R1
632
10KW
WIRE SPEED
CONTROL RHEOSTAT
633
N.B.
N.B.
TO WORK CABLE
RED
BLACK
BLUE
*
J13
622A
500A
ABCDE
J5
TRIGGER
CONNECTOR
NOTES
CONNECTIONS AS VIEWED FROM BACK OF RHEOSTAT AND SWITCHES.
BOTH JUMPER PLUGS MUST BE USED.
THE ’67’ LEAD TO THE POLARITY
N.A.
N.B.
N.F.
WHITE
BLACK
1 2
12 34
HALL
EFFECT
SWITCH
UBR
SWITCH COMES FROM THE CONDUCTOR BLOCK AND THE INPUT CABLE
CONNECTS DIRECTLY TO THE CONDUCTOR BLOCK.
541
539
GUN CABLE
BLACK
WHITE
INPUT CABLE
CONNECTOR CAVITY NUMBER
*
LN-35
LEGEND
S3 WIRE FEED MODE SWITCH
S1 POLARITY SWITCH
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diagram for a particular code is pasted inside
the machine on one of the enclosure panels. If the diagram is illegible, write to the Service Department for a replacement. Give the equipment code number.
NOTES
LN-35
WARNING
Spanish
AVISO DE
PRECAUCION
● Do not touch electrically live parts or
electrode with skin or wet clothing.
● Insulate yourself from work and
ground.
● No toque las partes o los electrodos
bajo carga con la piel o ropa mojada.
● Aislese del trabajo y de la tierra.
● Keep flammable materials away.
● Mantenga el material combustible
fuera del área de trabajo.
● Wear eye, ear and body protection.
● Protéjase los ojos, los oídos y el
cuerpo.
French
ATTENTION
German
WARNUNG
Portuguese
ATENÇÃO
Japanese
Chinese
Korean
Arabic
● Ne laissez ni la peau ni des vête-
ments mouillés entrer en contact
avec des pièces sous tension.
● Isolez-vous du travail et de la terre.
● Berühren Sie keine stromführenden
Teile oder Elektroden mit Ihrem
Körper oder feuchter Kleidung!
● Isolieren Sie sich von den
Elektroden und dem Erdboden!
● Não toque partes elétricas e elec-
trodos com a pele ou roupa molhada.
● Isole-se da peça e terra.
● Gardez à l’écart de tout matériel
inflammable.
● Entfernen Sie brennbarres Material!
● Mantenha inflamáveis bem guarda-
dos.
● Protégez vos yeux, vos oreilles et
votre corps.
● Tragen Sie Augen-, Ohren- und Kör-
perschutz!
● Use proteção para a vista, ouvido e
corpo.
READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO BE
USED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES.
SE RECOMIENDA LEER Y ENTENDER LAS INSTRUCCIONES DEL FABRICANTE PARA EL USO DE ESTE EQUIPO Y LOS
CONSUMIBLES QUE VA A UTILIZAR, SIGA LAS MEDIDAS DE SEGURIDAD DE SU SUPERVISOR.
LISEZ ET COMPRENEZ LES INSTRUCTIONS DU FABRICANT EN CE QUI REGARDE CET EQUIPMENT ET LES PRODUITS A
ETRE EMPLOYES ET SUIVEZ LES PROCEDURES DE SECURITE DE VOTRE EMPLOYEUR.
LESEN SIE UND BEFOLGEN SIE DIE BETRIEBSANLEITUNG DER ANLAGE UND DEN ELEKTRODENEINSATZ DES HERSTELLERS. DIE UNFALLVERHÜTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN.
● Keep your head out of fumes.
● Use ventilation or exhaust to
remove fumes from breathing zone.
● Turn power off before servicing.
● Do not operate with panel open or
guards off.
WARNING
● Los humos fuera de la zona de res-
piración.
● Mantenga la cabeza fuera de los
humos. Utilice ventilación o
aspiración para gases.
● Gardez la tête à l’écart des fumées.
● Utilisez un ventilateur ou un aspira-
teur pour ôter les fumées des zones
de travail.
● Vermeiden Sie das Einatmen von
Schweibrauch!
● Sorgen Sie für gute Be- und
Entlüftung des Arbeitsplatzes!
● Mantenha seu rosto da fumaça.
● Use ventilação e exhaustão para
remover fumo da zona respiratória.
● Desconectar el cable de ali-
mentación de poder de la máquina
antes de iniciar cualquier servicio.
● Débranchez le courant avant
l’entretien.
● Strom vor Wartungsarbeiten
abschalten! (Netzstrom völlig öffnen; Maschine anhalten!)
● Não opere com as tampas removidas.
● Desligue a corrente antes de fazer
serviço.
● Não toque as partes elétricas nuas.
● No operar con panel abierto o
guardas quitadas.
● N’opérez pas avec les panneaux
ouverts ou avec les dispositifs de
protection enlevés.
● Anlage nie ohne Schutzgehäuse
oder Innenschutzverkleidung in
Betrieb setzen!
● Mantenha-se afastado das partes
moventes.
● Não opere com os paineis abertos
ou guardas removidas.
Spanish
AVISO DE
PRECAUCION
French
ATTENTION
German
WARNUNG
Portuguese
ATENÇÃO
Japanese
Chinese
Korean
Arabic
LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA AS
PRÁTICAS DE SEGURANÇA DO EMPREGADOR.
• World's Leader in Welding and Cutting Products •
• Sales and Service through Subsidiaries and Distributors Worldwide •
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com
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