Lincoln Electric | LN-25 Pro | Operator Manual | LN-25™ PRO - Lincoln Electric

LN-25™ PRO - Lincoln Electric
IM901-A
LN-25™ PRO
January, 2010
For use with machines having Code Number: 11387, 11388, 11507, 11508
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.
IP23
IEC 60974-5
OPERATORʼS MANUAL
Copyright © Lincoln Global Inc.
• 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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SAFETY
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
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
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.
FOR ENGINE
powered equipment.
1.h. To avoid scalding, do not remove the
radiator pressure cap when the engine is
hot.
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.
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.
2.d.4. Connect the work cable to the workpiece as close as
possible to the area being welded.
___________________________________________________
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.5. Do not work next to welding power source.
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SAFETY
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.
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.
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 within applicable OSHA PEL and
ACGIH TLV limits 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.
5. b. The operation of welding fume control equipment is affected
by various factors including proper use and positioning of
the equipment, maintenance of the equipment and the specific welding procedure and application involved. Worker
exposure level should be checked upon installation and
periodically thereafter to be certain it is within applicable
OSHA PEL and ACGIH TLV limits.
5.c. Do not weld in locations near chlorinated hydrocarbon vapors
coming from degreasing, cleaning or spraying operations.
The heat and rays of the arc can react with solvent vapors to
form phosgene, a highly toxic gas, and other irritating products.
3.j. Also see Items 6.c. and 8.
5.d. 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.e. 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.f. Also see item 1.b.
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SAFETY
WELDING and CUTTING
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.
Remember that welding sparks and hot
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 though they have
been “cleaned”. For information, purchase “Recommended
Safe Practices for the Preparation for Welding and Cutting of
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.
6.f. Sparks and spatter are thrown from the welding arc. Wear oil
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.
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.
6.I. Read and follow NFPA 51B “ Standard for Fire Prevention
During Welding, Cutting and Other Hot Work”, available
from NFPA, 1 Batterymarch Park, PO box 9101, Quincy, Ma
022690-9101.
6.j. Do not use a welding power source for pipe thawing.
Refer to http://www.lincolnelectric.com/safety for additional safety information.
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SAFETY
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 LʼArc
1. Protegez-vous contre la secousse électrique:
a. Les circuits à lʼélectrode 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 sʼisoler 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 lʼeau 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 sʼapplicuent 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 nʼimporte quelle partie
du corps.
3. Un coup dʼarc peut être plus sévère quʼun coup de soliel,
donc:
a. Utiliser un bon masque avec un verre filtrant approprié
ainsi quʼun verre blanc afin de se protéger les yeux du rayonnement de lʼarc et des projections quand on soude ou
quand on regarde lʼarc.
b. Porter des vêtements convenables afin de protéger la
peau de soudeur et des aides contre le rayonnement de
lʻarc.
c. Protéger lʼautre personnel travaillant à proximité au
soudage à lʼaide dʼécrans appropriés et non-inflammables.
4. Des gouttes de laitier en fusion sont émises de lʼarc de
soudage. Se protéger avec des vêtements de protection libres
de lʼhuile, tels que les gants en cuir, chemise épaisse, pantalons sans revers, et chaussures montantes.
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5. Toujours porter des lunettes de sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones où lʼon pique le laitier.
6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque dʼincendie 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 dʼincendie.
8. Sʼassurer que la masse est connectée le plus prés possible
de la zone de travail quʼil est pratique de le faire. Si on place
la masse sur la charpente de la construction ou dʼautres
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 dʼincendie ou dʼechauffement des chaines et des
câbles jusquʼà ce quʼils 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
dʼopérations de dégraissage, nettoyage ou pistolage. La
chaleur ou les rayons de lʼarc 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
LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR
1. Relier à la terre le chassis du poste conformement au code de
lʼélectricité 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, Iʼinstallation et lʼentretien du poste seront
effectués par un électricien qualifié.
3. Avant de faires des travaux à lʼinterieur de poste, la debrancher à lʼinterrupteur à la boite de fusibles.
4. Garder tous les couvercles et dispositifs de sûreté à leur
place.
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Thank You
for selecting a QUALITY product by Lincoln Electric. We want you
to take pride in operating this Lincoln Electric Company product
••• as much pride as we have in bringing this product to you!
CUSTOMER ASSISTANCE POLICY
The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment, consumables, and cutting equipment. Our challenge is to meet the needs of our customers and to exceed their expectations. On occasion, purchasers may ask Lincoln
Electric for advice or information about their use of our products. We respond to our customers based on the best information in our possession at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability, with respect to such information or advice. We expressly disclaim any warranty of any kind, including any warranty of fitness for any customerʼs particular purpose,
with respect to such information or advice. As a matter of practical consideration, we also cannot assume any responsibility for updating or
correcting any such information or advice once it has been given, nor does the provision of information or advice create, expand or alter any
warranty with respect to the sale of our products.
Lincoln Electric is a responsive manufacturer, but the selection and use of specific products sold by Lincoln Electric is solely within the control
of, and remains the sole responsibility of the customer. Many variables beyond the control of Lincoln Electric affect the results obtained in
applying these types of fabrication methods and service requirements.
Subject to Change – This information is accurate to the best of our knowledge at the time of printing. Please refer to www.lincolnelectric.com
for any updated information.
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___________________________________________________________________________
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 WEB SITE at www.lincolnelectric.com. Choose “Quick Links” and then
“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:
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.
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TABLE OF CONTENTS
Page
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Installation.......................................................................................................................Section A
Technical Specifications .......................................................................................................A-1
Safety Precautions ...............................................................................................................A-2
Location ................................................................................................................................A-2
High Frequency Protection ...................................................................................................A-2
Weld cable Sizes ..................................................................................................................A-2
Cable Connections ...............................................................................................................A-3
Shielding Gas Connection ....................................................................................................A-3
Wire Drive Configuration ......................................................................................................A-4
Changing The Gun Receiver Bushing ................................................................................A-4
Procedure to Install Drive Rolls and Wire Guides ..............................................................A-4
Pressure Arm Adjustment ....................................................................................................A-5
Loading Spools of Wire ........................................................................................................A-5
Gun Connections..................................................................................................................A-5
Power Source to LN-25™ Pro Cable Connection Diagrams ..................................A-6 thru A-8
________________________________________________________________________________
Operation.........................................................................................................................Section B
Safety Precautions ...............................................................................................................B-1
Graphic Symbols that appear on this Machine or in this Manual .........................................B-1
Definition of Welding Terms .................................................................................................B-2
General Description..............................................................................................................B-2
Recommended Processes, Equipment Limitations, Recommended Power Sources ..........B-2
Case Front Controls ...............................................................................................B-3 thru B-5
Internal Controls ...................................................................................................................B-6
Internal Controls Decription ..................................................................................................B-7
Constant Current Wire Welding............................................................................................B-8
Rear Controls .......................................................................................................................B-9
Gas Purge Pushbutton .......................................................................................................B-10
Flow Meter..........................................................................................................................B-10
Power-Up Sequence ..........................................................................................................B-10
________________________________________________________________________________
Accessories ....................................................................................................................Section C
Factory Installed Equipment.................................................................................................C-1
Drive Roll Kits used ..............................................................................................................C-1
Accessories Used ..................................................................................................C-2 thru C-5
Installation of Water Cooling Kit ...........................................................................................C-6
________________________________________________________________________________
Maintenance ....................................................................................................................Section D
Safety Precautions ...............................................................................................................D-1
Routine Maintenance ...........................................................................................................D-1
Periodic Maintenance...........................................................................................................D-1
Calibration Specification ................................................................................................D-1,D-2
________________________________________________________________________________
Troubleshooting .............................................................................................................Section E
How to Use Troubleshooting Guide .....................................................................................E-1
Digital Display Models Error Codes......................................................................................E-2
Troubleshooting Guide .................................................................................................E-3, E-4
________________________________________________________________________________
Wiring Diagram & Dimension Prints .............................................................................Section F
________________________________________________________________________________
Parts Pages ................................................................................................................P-557 Series
_______________________________________________________________________________
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A-1
A-1
INSTALLATION
TECHNICAL SPECIFICATIONS – LN-25™ PRO ACROSS THE ARC MODEL
(K2613-1, K2613-2)
INPUT VOLTAGE and CURRENT
INPUT VOLTAGE ± 10%
INPUT AMPERES
15-110 VDC
4A
RATED OUTPUT @ 104°F (40°C)
DUTY CYCLE
INPUT AMPERES
60% rating
450
100% rating
325
GEARING - WIRE FEED SPEED RANGE-WIRE SIZE
GMAW
FCAW
GEARING
WFS RANGE
WIRE SIZES
WFS RANGE
WIRE SIZES
Extra torque
K2613-2
30 – 400 ipm
(0.8 – 10.1m/min)
.023 – 1/16"
(0.6 – 1.6mm)
30 – 400 ipm
(0.8 – 10.1m/min)
.030 - 3/32”
(10.3 – 2.4mm)
Standard Speed
K2613-1
50 – 700 ipm
(1.3 – 17.7m/min)
.023 – 1/16"
(0.6 – 1.6mm)
50 – 700 ipm
(1.3 – 17.7m/min)
.030 - 5/64
(0.8 - 2.0mm)
PHYSICAL DIMENSIONS
HEIGHT
14.8 Inches
(376 mm)
Handle folded down
WIDTH
8.7 Inches
( 221 mm)
DEPTH
22.2 Inches
(589 mm)
TEMPERATURE RANGE
OPERATION:
STORAGE:
-40°F to 104°F (-40°C to 40°C)
-40°F to 185°F (-40°C to 85°C)
LN-25™ PRO ACROSS THE ARC MODEL
WEIGHT
36 lbs
(16 kg)
A-2
A-2
INSTALLATION
SAFETY PRECAUTIONS
The handle of the LN-25™ PRO is intended for
moving the wire feeder about the work place only.
WARNING
ELECTRIC SHOCK CAN KILL.
• Turn the input power OFF at the
disconnect switch or fuse box
before attempting to connect or
disconnect input power lines, output cables or control cables.
• Only qualified personnel should
perform this installation.
• Do not touch metal portions of the work clip
when the welding power source is on.
• Do not attach the work clip to the wire feeder.
• Connect the work clip directly to the work, as
close as possible to the welding arc.
• Turn power off at the welding power source
before disconnecting the work clip from the
work.
• Only use on power sources with open circuit
voltages less than 110 VDC.
------------------------------------------------------------------------
LOCATION
For best wire feeding performance, place the LN25™ PRO on a stable and dry surface. Keep the
wire feeder in a vertical position. Do not operate the
wire feeder on an angled surface of more than 15
degrees.
When suspending a wire feeder, insulate the
hanging device from the wire feeder enclosure.
HIGH FREQUENCY PROTECTION
CAUTION
Locate the LN-25™ PRO away from radio controlled
machinery. The normal operation of the LN-25™
PRO may adversely affect the operation of RF controlled equipment, which may result in bodily injury
or damage to the equipment.
----------------------------------------------------------------------------
WELD CABLE SIZE
Table A.1 located below are copper cable sizes recommended for different currents and duty cycles.
Lengths stipulated are the distance from the welder to
work and back to the welder again. Cable sizes are
increased for greater lengths primarily for the purpose
of minimizing cable drop.
Do not submerge the LN-25™ PRO.
The LN-25™ PRO is rated IP23 and is suitable for
outdoor use.
TABLE A.1
RECOMMENDED CABLE SIZES (RUBBER COVERED COPPER - RATED 167°F or 75°C)**
CABLE SIZES FOR COMBINED LENGTHS OF ELECTRODE AND WORK CABLES
AMPERES PERCENT
0 to 50Ft.
50 to 100Ft.
100 to 150 Ft.
150 to 200 Ft.
200 to 250 Ft.
DUTY
(0 to15m)
(15 to 30m)
(30 to 46m)
(46 to 61m)
(61 to 76m)
CYCLE
200
200
225
225
250
250
250
250
300
325
350
400
400
500
60
100
20
40 & 30
30
40
60
100
60
100
60
60
100
60
2
2
4 or 5
3
3
2
1
1
1
2/0
1/0
2/0
3/0
2/0
2
2
3
3
3
2
1
1
1
2/0
1/0
2/0
3/0
2/0
2
2
2
2
2
1
1
1
1
2/0
2/0
2/0
3/0
3/0
1
1
1
1
1
1
1
1
1/0
2/0
2/0
3/0
3/0
3/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
2/0
3/0
3/0
4/0
4/0
4/0
** Tabled values are for operation at ambient temperatures of 104°F(40°C) and below. Applications above 104°F(40°C) may require cables
larger than recommended, or cables rated higher than 167°F(75°C).
LN-25™ PRO ACROSS THE ARC MODEL
A-3
A-3
INSTALLATION
SHIELDING GAS CONNECTION
CABLE CONNECTIONS
There is one circular connector for the gun trigger on
the front of the LN-25™ PRO.
Function
5-pin trigger
connector for
push-guns
only.
Pin
Wiring
A
B
C
D
E
Trigger
Not used
Common
Not used
Not used
C
D
B
E
A
WARNING
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 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.
---------------------------------------------------------------------------Maximum inlet pressure is 100 psi. (6.9 bar.)
Install the shielding gas supply as follows:
1. Secure the cylinder to prevent it from falling.
2. Remove the cylinder cap. Inspect the cylinder valves
and regulator for damaged threads, dirt, dust, oil or
grease. Remove dust and dirt with a clean cloth. DO
NOT ATTACH THE REGULATOR IF OIL, GREASE
OR DAMAGE IS PRESENT! Inform your gas supplier
of this condition. Oil or grease in the presence of high
pressure oxygen is explosive.
3. Stand to one side away from the outlet and open the
cylinder valve for an instant. This blows away any dust
or dirt which may have accumulated in the valve outlet.
4. Attach the flow regulator to the cylinder valve and
tighten the union nut(s) securely with a wrench. Note:
if connecting to 100% CO2 cylinder, insert regulator
adapter between regulator and cylinder valve. If
adapter is equipped with a plastic washer, be sure it is
seated for connection to the CO2 cylinder.
5. Attach one end of the inlet hose to the outlet fitting of
the flow regulator. Attach the other end to the welding
system shielding gas inlet. Tighten the union nuts with
a wrench.
6. Before opening the cylinder valve, turn the regulator
adjusting knob counterclockwise until the adjusting
spring pressure is released.
7. Standing to one side, open the cylinder valve slowly a
fraction of a turn. When the cylinder pressure gage
stops moving, open the valve fully.
8. The flow regulator is adjustable. Adjust it to the flow
rate recommended for the procedure and process
being used before making a weld.
LN-25™ PRO ACROSS THE ARC MODEL
A-4
A-4
INSTALLATION
WIRE DRIVE CONFIGURATION
(See Figure A.2)
CHANGING
BUSHING
THE
GUN
RECEIVER
WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the
welding power source before installation or changing drive rolls and/or
guides.
• Do not touch electrically live parts.
• When inching with the gun trigger, electrode
and drive mechanism are "hot" to work and
ground and could remain energized several seconds after the gun trigger is released.
• Do not operate with covers, panels or guards
removed or open.
• Only qualified personnel should perform maintenance work.
---------------------------------------------------------------------------Tools required:
• 1/4" hex key wrench.
Note: Some gun bushings do not require the use of
the thumb screw.
1. Turn power off at the welding power source.
2. Remove the welding wire from the wire drive.
3. Remove the thumb screw from the wire drive.
4. Remove the welding gun from the wire drive.
5. Loosen the socket head cap screw that holds the
connector bar against the gun bushing.
Important: Do not attempt to completely
remove the socket head cap screw.
6. Remove the outer wire guide, and push the gun
bushing out of the wire drive. Because of the precision fit, light tapping may be required to remove
the gun bushing.
7. Disconnect the shielding gas hose from the gun
bushing, if required.
8. Connect the shielding gas hose to the new gun
bushing, if required.
9. Rotate the gun bushing until the thumb screw hole
aligns with the thumb screw hole in the feed plate.
Slide the gun receiver bushing into the wire drive
and verify the thumb screw holes are aligned.
10. Tighten the socket head cap screw.
11. Insert the welding gun into the gun bushing and
tighten the thumb screw.
PROCEDURE TO INSTALL DRIVE ROLLS
AND WIRE GUIDES
WARNING
• Turn the input power OFF at the
welding power source before installation or changing drive rolls and/or
guides.
• Do not touch electrically live parts.
• When inching with the gun trigger, electrode
and drive mechanism are "hot" to work and
ground and could remain energized several seconds after the gun trigger is released.
• Do not operate with covers, panels or guards
removed or open.
• Only qualified personnel should perform maintenance work.
-----------------------------------------------------------------------1. Turn power off at the welding power source.
2. Release the idle roll pressure arm.
3. Remove the outer wire guide by turning the knurled
thumbscrews counter-clockwise to unscrew them
from the feed plate.
4. Rotate the triangular lock and remove the drive
rolls.
FIGURE A.2
THUMB SCREW
GUN RECEIVER BUSHING
OUTER WIRE GUIDE
CONNECTOR BLOCK
SOCKET HEAD
CAP SCREW
LOOSEN
5. Remove the inner wire guide.
6. Insert the new inner wire guide, groove side out,
over the two locating pins in the feed plate.
7. Install a drive roll on each hub assembly secure
with the triangular lock.
8. Install the outer wire guide by aligning it with the
pins and tightening the knurled thumbscrews.
9. Close the idle arm and engage the idle roll pressure
arm. Adjust the pressure appropriately.
TIGHTEN
LN-25™ PRO ACROSS THE ARC MODEL
A-5
A-5
INSTALLATION
PRESSURE ARM ADJUSTMENT
WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the welding power source before installation or
changing drive rolls and/or guides.
• Do not touch electrically live parts.
• When inching with the gun trigger, electrode
and drive mechanism are "hot" to work and
ground and could remain energized several seconds after the gun trigger is released.
• Do not operate with covers, panels or guards
removed or open.
• Only qualified personnel should perform maintenance work.
---------------------------------------------------------------------------The pressure arm controls the amount of force the
drive rolls exert on the wire. Proper adjustment of the
pressure arm gives the best welding performance.
Set the pressure arm as follows:
(See Figure A.3)
Aluminum wires
between 1 and 3
Cored wires
between 3 and 4
Steel, Stainless wires between 4 and 6
FIGURE A.3
6
Al
Fe, CrNi
Fe, CrNi
ALUMINUM WIRES
CORED WIRES
STEEL, STAINLESS WIRES
LOADING SPOOLS OF WIRE
WARNING
• Keep hands, hair, clothing and tools
away from rotating equipment.
• Do not wear gloves when threading wire
or changing wire spool.
• Only qualified personnel should install,
use or service this equipment.
-----------------------------------------------------------------------Loading 10 to 15 lb. (4.5 – 6.8kg) Spools.
1. Squeeze the release bar on the retaining collar and
remove it from the spindle.
2. Place the spindle adapter on the spindle, aligning
the spindle brake pin with the hole in the adapter.
3. Place the spool on the spindle and align the
adapter brake tab with one of the holes in the back
side of the spool. An indicator mark on the end of
the spindle shows the orientation of the brake tab.
Be certain the wire feeds off of the spool in the
proper direction.
4. Re-install the retaining collar. Make sure that the
release bar snaps out and that the retaining collar
fully engages the groove on the spindle.
GUN CONNECTION
WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the welding power source before installation or
changing drive rolls and/or guides.
• Do not touch electrically live parts.
• When inching with the gun trigger, electrode
and drive mechanism are "hot" to work and
ground and could remain energized several seconds after the gun trigger is released.
• Do not operate with covers, panels or guards
removed or open.
• Only qualified personnel should perform maintenance work.
---------------------------------------------------------------------------The LN-25™ PRO ACROSS THE ARC MODEL
comes with a K1500-2 gun adapter installed. (See
Figure A.4)
To install a gun,
1. Turn power OFF.
2. Remove the thumb screw.
3. Push the gun the completely into the gun bushing.
4. Secure the gun in place with the thumb screw.
5. Connect the trigger cable from the gun to the trigger
connector on the front of the feeder.
Note: Not all gun bushings require the use of the
thumb screw.
FIGURE A.4
A K468 spindle adapter is required for loading 2"
(51mm) wide spools on 2" (51mm) spindles. Use a
K468 spindle adapter for loading 2-1/2" (64mm) wide
spools.
LN-25™ PRO ACROSS THE ARC MODEL
THUMB
SCREW
GUN
A-6
A-6
INSTALLATION
POWER SOURCE TO LN-25™ PRO
CABLE CONNECTION DIAGRAMS
ACROSS THE ARC SET-UPS
CC Power Sources with Output Terminals Always
Hot (See Figure A.5)
CC Power Source
Ranger 250, 250 LPG
Ranger 305G, 305D
FIGURE A.5
Commander 300
Vantage 300, 400, 500
Air Vantage 500
Ranger 10,000
Electrode
LN-25™ PRO
(Across the Arc)
Ranger 3 phase
SAE 400 with CV adapter
Engine Driven welder with
Wire Feed Module
Work clip
Work
If the power source has a Remote/Local switch, place
the switch in the Local position.
Place the CV/CC switch in the feeder in the "CC" position.
K#
Description
K2613-1
K2613-2
KP1695-XX
KP1696-XX
KP1697-XX
See Magnum Literature
LN-25™ PRO
LN-25™ PRO Extra Torque
K1803-1
Drive Roll Kit
Welding Gun
CC power Source
Welding Cables
CV Power Sources with Stud Connectors and
Remote/Local Switch (See Figure A.6)
FIGURE A.6
CV-655
DC-400
DC-600
DC-655
V450-Pro
Electrode
LN-25™ PRO
(Across the Arc)
Work clip
Work
Place the power source Remote/Local switch in the
Local position.
Place CV/CC switch in the feeder in the "CV" position.
K#
Description
K2613-1
K2613-2
KP1695-XX
KP1696-XX
KP1697-XX
See magnum Literature
LN-25™ PRO
LN-25™ PRO Extra Torque
K1803-1
LN-25™ PRO ACROSS THE ARC MODEL
Drive Roll Kit
Welding Gun
CV power Source
Welding Cables
A-7
A-7
INSTALLATION
CV Power Sources with Stud Connectors and no
Remote/Local Switch. (See Figure A.7)
FIGURE A.7
Jumper
CV-400
CV-655
Electrode
LN-25™ PR0
(Across The Arc)
Work clip
Work
K#
Description
K2613-1
K2613-2
KP484
KP1695-XX
KP1696-XX
KP1697-XX
See Magnum Literature
LN-25™ PRO
LN-25™ PRO Extra Torque
Jumper Plug Kit
Place CV/CC switch in the feeder in the "CV" position.
K1803-1
Drive Roll Kit
Welding Gun
CC power Source
Welding Cables
CV Power Source with Twist-Mate Connectors and
Remote/Local Switch. (See Figure A.8)
FIGURE A.8
V350-Pro
Electrode
LN-25™ PRO
(Across the Arc)
Work clip
Work
Place CV/CC switch in the feeder in the "CV" position.
K#
Description
K2613-1
K2613-2
KP1695-XX
KP1696-XX
KP1697-XX
See Magnum Literature
LN-25™ PRO
LN-25™ PRO Extra Torque
K1841
LN-25™ PRO ACROSS THE ARC MODEL
Drive Roll Kit
Welding Gun
CC power Source
Welding Cables
A-8
A-8
INSTALLATION
CV Power Source with Twist-Mate Connectors and
no Remote/Local Switch. (See Figure A.9)
FIGURE A.9
Jumper
CV-250
CV-300
CV-305
LN-25™ PRO
Electrode
Work clip
Work
Place CV/CC switch in the feeder in the "CV" position.
K#
Description
K2613-1
K2613-2
KP1695-XX
KP1696-XX
KP1697-XX
See Magnum Literature
LN-25™ PRO
LN-25™ PRO Extra Torque
K1841K484
LN-25™ PRO ACROSS THE ARC MODEL
Drive Roll Kit
Welding Gun
CV power Source
Welding Cables
Jumper Plug kit
B-1
B-1
OPERATION
SAFETY PRECAUTIONS
READ AND UNDERSTAND ENTIRE SECTION
BEFORE OPERATING MACHINE.
GRAPHIC SYMBOLS THAT APPEAR ON
THIS MACHINE OR IN THIS MANUAL
INPUT POWER
WARNING
• ELECTRIC SHOCK CAN KILL.
Unless using COLD FEED feature, when feeding with gun trigger, the electrode and drive
mechanism are always electrically energized and could
remain energized several seconds after the welding ceases..
• Do not touch electrically live part or electrode
with skin or wet clothing.
• Insulate yourself from work and ground.
• Always wear dry insulating gloves.
• Do not operate with covers, panels or guards
removed or open.
------------------------------------------------------------------------• 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.
------------------------------------------------------------------------SEE ADDITIONAL WARNING INFORMATION
UNDER ARC WELDING SAFETY PRECAUTIONS
AND IN THE FRONT OF THIS OPERATING MANUAL.
-------------------------------------------------------------------------
ON
OFF
WIRE FEEDER
POSITIVE OUTPUT
NEGATIVE OUTPUT
INPUT POWER
DIRECT CURRENT
U0
OPEN CIRCUIT
VOLTAGE
U1
INPUT VOLTAGE
U2
OUTPUT VOLTAGE
I1
INPUT CURRENT
I2
OUTPUT CURRENT
PROTECTIVE
GROUND
WARNING OR
CAUTION
LN-25™ PRO ACROSS THE ARC MODEL
B-2
B-2
OPERATION
DEFINITION OF WELDING TERMS
WFS
• Wire Feed Speed
CC
• Constant Current
General Functional Description
The LN-25™ PRO as designed is a simple, robust
feeder. Standard features include a calibrated wire
feed speed dial, 2 step/trigger interlock switch, CV-CC
switch, Gas Purge and Cold Feed.
RECOMMENDED PROCESSES
CV
• Constant Voltage
• GMAW
• FCAW
GMAW
• Gas Metal Arc welding
PROCESS LIMITATIONS
• GMAW-P procedures must be qualified by the customer.
• Across-the-Arc models are not recommended for
stitch or spot welding.
SMAW
• Shielded Metal Arc welding
FCAW
• Flux Core Arc Welding
EQUIPMENT LIMITATIONS
GENERAL DESCRIPTION
General Physical Description
The LN-25™ PRO is specially engineered to be the
most rugged portable wire feeder available.
Several models of the LN-25™ PRO are offered to
best meet individual welder needs. The Extra Torque
model features additional torque gearing for reliable
feeding of large diameter FCAW wires. All of the models include a gas solenoid and flow meter for the flexibility to run most wire processes.
The plastic case is molded from a high impact, flame
retardant plastic for durability and low weight. The
patent pending design keeps the internal components
protected and dry.
The heart of the LN-25™ PRO is the 2 roll MAXTRAC™ drive. The patented features on the wire
drive offer tool-less changing of the drive rolls and
wire guides for quick spool changes. A tachometer
controlled motor powers the patent pending drive rolls
for smooth, steady feeding without slippage.
With only one p.c. board, the LN-25™ PRO is
designed to be simple, reliable and easy to service.
The p.c. board is mounted with Lincolnʼs leading environmental design protection by mounting the board in
a plastic tray and potting it with epoxy.
• The duty cycle of the wire feeder is 325A, 100% and
450A, 60%. Duty cycle is based upon the amount of
welding performed in a 10 minute period.
• The maximum spool size is 45 lb, 12" diameter.
• Maximum FCAW gun length is 15 ft.
• Maximum GMAW gun length is 25 ft.
• Push-pull guns do not work with the wire feeder.
• When using the digital meter kit, preset voltage is
accurate only with the following power sources:
Invertec V-350
CV-305
Invertec V-450
CV-400
DC-400
DC-600
DC-655
RECOMMENDED POWER SOURCES
• CV-250
• CV-300
• CV-305
• CV-400
• CV-655
• DC-400
• DC-600
• DC-655
• Invertec V-350 PRO
• Invertec V-450 PRO
• Multi-Weld 350
• Ranger 10,000
LN-25™ PRO ACROSS THE ARC MODEL
• Ranger 3 Phase
• Ranger GXT
• Ranger 250
• Ranger 305
• SAE-400
• Pipeliner 200G
• Classic 300
• Vantage 300
• Vantage 400
• Vantage 500
• Air Vantage 500
B-3
B-3
OPERATION
(See Customer Assistance Policy in the front of this
Instruction Manual)
CASE FRONT CONTROLS (See Figure B.1)
FIGURE B.1
1
5
6
2
3
4
ITEM
1
2
3
4
5
6
DESCRIPTION
Analog Voltmeter
Wire Feed Speed Knob
5-pin gun trigger connector
Work sense lead
Thermal LED, Motor Overload
Polarity LED
1. ANALOG VOLTMETER
The analog voltmeter shows the voltage between
electrode and work. On across the arc models, the
voltmeter shows open circuit voltage when the wire
feeder is not welding. The voltmeter is polarity
insensitive and the range is 0 – 40VDC.
LN-25™ PRO ACROSS THE ARC MODEL
B-4
B-4
OPERATION
2. WIRE FEED SPEED KNOB
The large, calibrated wire feed speed knob makes
for easy and accurate adjustment of the wire feed
speed. The knob rotates 3/4 turn. Turn the knob
clockwise to increase the wire feed speed, and
counter clockwise to reduce the wire feed speed.
Models with analog voltmeters have a calibrated
scale printed around the wire feed speed knob
using "in/min" units. A separate decal with "m/min"
units is included with these models wire feeder.
Wire Feed Speed, CV Operation
When Across the Arc models are operated with CV
power sources, the wire feed speed will remain a constant value, independent of arc voltage changes, as
along as the arc voltage does not drop below the values per the following table.
CV OPERATION
Minimum Arc Volts Maximum WFS Maximum WFS
Standard Spin (Extra Torque
Gearing)
Gearing
210
280
15 V
235
340
17 V
400
440
21 V
400
520
24 V
400
600
27 V
Wire Feed Speed, CC Operation
When Across the Arc models are operated with CC
power sources, the wire feed speed changes as the
arc voltage changes. When the arc voltage increases,
the wire feed speed will increase; and when the arc
voltage decreases, the wire feed speed will decrease.
To preset the wire feed speed on CC power sources:
1. Set the Wire Feed Mode switch inside the LN25™ Pro to "CC".
2. Refer to the Figure B.1a graph for the setting for
the wire feed speed knob setting. Select the horizontal line representing the Desired Wire Feed
Speed. (See Figure B.1a arrow for 375 in/min.)
3. Select the diagonal line representing the Arc
Volts. (See Figure B.1a for 29 volts.)
4. Determine the vertical line representing the CC
representing the CC Wire Feed Speed setting
where the above two lines cross. (See Figure
B.1a arrow line for 450.) Set the LN-25™ Pro
wire feed speed knob to this value.
CC WFS dial setting = desired WFS x 35
Arc Volts
Example:
= 375 in/min. (Horizontal Line) x 35
29 Arc Volts (Diagonal Line)
= 452.5 (Vertical Line) Use 450 setting
(See Figure B.1a)
FIGURE B.1a
CC
200
250
300
15
17
19
21
450
23
500
550
600
25
27
29
31
650
700
33
VOLTS
ARC
35
35
700
33
650
31
600
29
550
27
500
25
ARC
VOLTS
23
450
21
400
375
350
19
17
15
300
250
200
in/min.
.nim/ni
50 100 150 200 250 300 350 400 450 500 550 600 650 700
50
100
150
350
375
400
150
A constant voltage (CV) power
source is recommended for fluxcored arc welding. (FCAW) and
gas metal arc welding (GMAW) to
obtain code quality results.
However, this wire feeder may also
be used with a constant current
(CC) power source to obtain passable results for noncritical quality
applications.
100
50
50
100
150 200 250 300 350 400 450 500 550 600 650 700
CC
LN-25™ PRO ACROSS THE ARC MODEL
B-5
OPERATION
3. 5-PIN GUN TRIGGER CONNECTOR
4. WORK SENSE LEAD
5. THERMAL LED, MOTOR OVERLOAD
The thermal light illuminates when the
wire drive motor draws too much current.
If the thermal light illuminates, the wire
drive will automatically shutdown for up to
30 seconds to allow the motor to cool. To
start welding 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.
6. POLARITY LED
The Polarity LED
lights when the wire
+ POLARITY
feeder is connected
POLARDAD
for positive polarity.
- POLARITÉ
Use the polarity
LED to verify the
wire feeder is connected for the proper polarity.
- POLARITÉ
POLARDAD
+ POLARITY
LN-25™ PRO ACROSS THE ARC MODEL
B-5
B-6
B-6
OPERATION
INTERNAL CONTROLS
FIGURE B.2
5
4
3
2
1
8
7
9
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
10
11
12
DESCRIPTION
2 Step Trigger Interlock Switch
CV / CC Switch
Pressure Adjustment Arm
Optional Timer Kit (See Accessories Section)
Spool Retainer
Spindle Brake
Gun Bushing
Thumb Screw for securing the welding Gun
Socket Head Cap Screw for securing the Gun Bushing
Drive Hubs
Inlet Wire Guide
Cold Feed Pushbutton
LN-25™ PRO ACROSS THE ARC MODEL
6
B-7
B-7
OPERATION
INTERNAL CONTROLS DESCRIPTION
(See Figure B.2)
CV/CC SWITCH
(See Figure B.2)
The CV/CC switch sets the wire
feed speed control method for the
wire feeder.
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
welding to continue when the trigger 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.
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 changing the wire feed speed.
COLD FEED PUSHBUTTON
(See Figure B.2)
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 comfort 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.
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.
CAUTION
If the arc goes out while welding with
trigger interlock operation, the electrode 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.
----------------------------------------------------------------------------
LN-25™ PRO ACROSS THE ARC MODEL
CV
CC
CC
CV
B-8
B-8
OPERATION
CONSTANT CURRENT WIRE WELDING
(See Figure B.3)
Most semiautomatic welding processes perform better
using constant voltage power sources.
Welding codes usually do not address the power
source selection or specifically, whether the welding
process is to be operated in the constant voltage or
constant current mode. Instead, codes typically specify limitations on the current, voltage, heat input and
preheat temperature based on the material to be
welded. The intention is to assure that proper weld
material properties will develop.
Welding is sometimes performed using constant current power sources. The operation can be more convenient because it may allow the use of an existing
stick (SMAW) power source and the power source
can be placed at a distant location without any provision for adjusting the output settings.
For constant current operation, the power source is
set to deliver the specified current. The power source
regulates this current regardless of changes in the
welding circuit, including cable length, electrode diameter, wire feed speed, contact tip to work distance,
etc.
If the contact tip to work distance is properly maintained, a satisfactory operating voltage range may be
achieved, and a sound weld may result. However,
when a welder uses a longer contact tip to work distance, an arc-sensing wire feeder compensates by
increasing the wire feed speed to regulate the voltage.
Even if the voltage and current remain unchanged, the
increased wire feed speed may result in a deposition
rate well beyond the specified range of the electrode.
Under these conditions, the specified weld metal properties may not be achieved.
Constant voltage power sources deliver large current
surges to stabilize the arc when the electrode is shorted or the arc length is very short. However, a constant
current power source does not provide such a
response to stabilize the arc. It may be difficult to
achieve required weld metal properties, or to achieve
the required quality of welds needed to pass nondestructive tests, when such welds are made under constant current operation.
For these reasons, Lincoln Electric does NOT recommend constant current semiautomatic welding for
applications which need to meet specified weld metal
chemical or mechanical property requirements or weld
quality requirements.
Changes in the wire feed speed (WFS) or contact tip
to work distance (CTWD) affect the arc voltage when
constant current power sources are used. Lowering
the wire feed speed raises the voltage, raising the
wire feed speed lowers the voltage. Lengthening the
contact tip to work distance raises the voltage, shortening the contact tip to work distance lowers the voltage.
FIGURE B-3
Current
+
Wire
Feeder
CTWD
WFS
Constant Current
Power Source
-
Current
LN-25™ PRO ACROSS THE ARC MODEL
B-9
B-9
OPERATION
REAR CONTROLS:
6
5
4
3
2
1
ITEM
connections
Optional Water cooled gun
Electrode Lead
Shielding Gas Inlet
Flow Meter Valve
Flow Meter Ball
Gas Purge Pushbutton
DESCRIPTION
6
5
4
3
2
1
1
2
3
4
5
6
ITEM
1
2
3
4
5
6
DESCRIPTION
Gas Purge Pushbutton
Flow Meter Ball
Flow Meter Valve
Shielding Gas Inlet
Electrode Lead
Optional Water cooled gun
connections
LN-25™ PRO ACROSS THE ARC MODEL
B-10
OPERATION
GAS PURGE PUSHBUTTON
POWER-UP SEQUENCE
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.
On feeders with analog voltmeters, the thermal LED
will briefly light during power-up.
If the gun trigger is activated during power up, the
feeder will not operate until the gun trigger is released.
FLOW METER
The flowmeter shows the flow rate of shielding gas
and has a valve to adjust the flow. The flow meter is
scaled for CO2, Ar, and Ar/CO2 blends. The middle of
the ball indicates the flow rate of shielding gas.
Adjust the flow rate while depressing the GAS
PURGE switch 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.
When using a wire feeder with
a flow meter, adjust the regulator at the shield gas bottle or
supply to a flow rate that is
higher than the flow rate indicated on the feeder flow
meter. Note that most regulators are calibrated based upon
having low restrictions on the
outlet. The valve on the feeder
flow meter creates a high
restriction and may cause
errors in the readings at the
supply regulator. Set the gas
flow rate using the feeder flow
meter reading and not the
supply regulator reading.
SCFH
10
20
30
40
50
60
70
80
B-10
90
80
70
60
50
40
B all
30
20
10
Valve
Liter/Min.
4.7
9.4
14.2
18.9
23.6
28.3
33.1
37.8
LN-25™ PRO ACROSS THE ARC MODEL
C-1
ACCESSORIES
FACTORY INSTALLED EQUIPMENT
• K1500-2 Gun Receiver Bushing.
DRIVE ROLL KITS
WIRE TYPE
Steel Wires:
Cored Wires:
Aluminum Wires:
ELECTRODE SIZE
.023-.030 (0.6-0.8mm)
.035 (0.9mm)
.045 (1.2mm)
.052 (1.4mm)
1/16 (1.6mm)
.035,.045 (0.9, 1.2mm)
.040 (1.0mm)
.030-.035" (0.8-0.9mm)
.040-.045" (1.0-1.2mm)
.052" (1.4mm)
1/16" (1.6mm)
.068-.072" (1.7-1.8mm)
5/64" (2.0mm)
3/32” (2.4mm)
.035" (0.9 mm)
.040" (1.0mm)
3/64" (1.2mm)
1/16" (1.6mm)
KP KIT
KP1696-030S
KP1696-035S
KP1696-045S
KP1696-052S
KP1696-1/16S
KP1696-1
KP1696-2
KP1697-035C
KP1697-045C
KP1697-052C
KP1697-1/16C
KP1697-068
KP1697-5/64
KP1697-3/32
KP1695-035A
KP1695-040A
KP1695-3/64A
KP1695-1/16A
Includes: 2 V groove
drive rolls and inner
wire guide.
Includes: 2 Knurled
drive rolls and inner
wire guide.
Includes: 2 polished
U groove drive rolls,
outer wire guide and
inner wire guide.
LN-25™ PRO ACROSS THE ARC MODEL
C-1
C-2
ACCESSORIES
K1796-xx
AWG 1/0 Co-Axial Power Cable
Includes: 1/0 Coaxial weld
cable of length "xx". Ends of
the weld cable have lug connections. Use for Pulse welding.
K2593-xx
AWG #1 Coaxial Power Cable
Includes: AWG #1 Coaxial
weld cable of length "xx".
Ends of the weld cable have
lug connections. Use for
Pulse or STT™ welding.
K1803-1
Work and Feeder Cables Package
Includes: Twist-Mate to Lug
2/0 cable 14' (1.2m) long with
Ground Clamp, and TwistMate to Lug 2/0 Cable 9'
(2.7m) long.
K1840-xx
Weld Power Cable, Twist-Mate to
Lug
Includes: Twist-Mate to Lug,
1/0 cable of length "xx".
K1842-xx
Weld Power Cable, Lug to Lug
IIncludes: Lug to Lug, 3/0
Cable of length "xx" for lengths
up to 60' (18.3m). Lug to Lug,
4/0 Cable of length "xx" for
lengths greater than 60'
(18.3m).
LN-25™ PRO ACROSS THE ARC MODEL
C-2
C-3
ACCESSORIES
K1797-xx
K2335-1
K484
K1520-1
(requires Digital
Meter/remote
control kit)
K1798
(requires
remote control
kit
Control Cable
Adapter for Competitive Power
Sources
Jumper Plug Kit
42 Volt Transformer Kit
Includes: 14 pin to 14 pin wire
feeder to power source control
cable.
Includes: Adapter control
cable for connecting a Lincoln
42 VAC wire feeder to a 24
VAC Miller power source.
Requires the digital
meter/remote voltage control
kit.
Includes: 14 pin circular connector with jumper for leads 24. For use in power sources
for turning the weld terminals
"ON" at all times.
Includes: One transformer kit
for operating a 42 VAC wire
feeder on a power source supplying only 115 VAC.
Adapter Cable for Control Cable to Includes: 14 circular connector
Terminal Strip Power Sources
with leads to connect to a terminal strip.
LN-25™ PRO ACROSS THE ARC MODEL
C-3
C-4
ACCESSORIES
K910-1
Ground Clamp
Includes: One 300 Amp
Ground Clamp.
K910-2
Ground Clamp
Includes: One 500 Amp
Ground Clamp.
K1500-1
Gun Receiver Bushing (for guns
with K466-1 Lincoln gun connectors; Innershield and Subarc guns)
Includes: Gun receiver bushing, set screw and hex key
wrench.
K1500-2
Gun Receiver Bushing (for guns
with K466-2, K466-10 Lincoln gun Includes: Gun receiver bushconnectors; Magnum 200/300/400 ing with hose nipple, set screw
and hex key wrench.
guns and compatible with Tweco®
#2-#4)
K1500-3
Includes: Gun receiver bushGun Receiver Bushing (for guns
with K613-7 Lincoln gun connec- ing with hose nipple, set screw
and hex key wrench.
tors; Magnum 550 guns and compatible with Tweco® #5)
LN-25™ PRO ACROSS THE ARC MODEL
C-4
C-5
ACCESSORIES
K1500-4
Gun Receiver Bushing (for gun
Includes: Gun receiver bushwith K466-3 Lincoln gun connec- ing with hose nipple, set screw
tors; compatible with Miller® guns.)
and hex key wrench.
K1500-5
Gun Receiver Bushing (compatible
with Oxo® guns.)
Includes: Gun receiver bushing
with hose nipple, 4 guide tubes,
set screw and hex key wrench.
K489-7
Gun Receiver Bushing (for Lincoln
Fast-Mate guns.)
Includes: Gun receiver bushing
with trigger connector.
K435
Spindle Adapter, for mounting 14
lb. (6.4 kg) Innershield Coils on 2
in (51 mm) spindles.
Includes: Spindle Adapter made
from 2 coil retainers. (Electrode
not included.)
K468
Spindle Adapter, for mounting 8in
(203mm) diameter spools on 2 in
(51 mm) spindles.
Includes: 2 Spindle Adapters,
one for 2" wide spools and the
other for 3" wide spools.
K590-6
Includes: 2 hoses with female
Water Connection Kit (for
quick connectors at each end, 2
European and Control cable modmale connectors for 3/16" ID
els only)
hose, 2 male connectors for _" ID
hose, and mounting hardware.
K586-1
Deluxe Adjustable Gas Regulator
Includes: Deluxe Gas Regulator
for Mixed Gases, Adapter for
CO2 and 10' (3.0m) Hose.
LN-25™ PRO ACROSS THE ARC MODEL
C-5
C-6
C-6
ACCESSORIES
INSTALLATION OF THE K590-6 WATER
COOLING KIT
4. Use a 5/16" nut driver to remove the screws holding
the water cooling cover on the case front of the
inner module and on the rear of the case.
WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the disconnect switch before working on
this equipment.
• Do not touch electrically hot parts.
• Only qualified personnel should
install, use or service this equipment.
-----------------------------------------------------------------------The K590-6 components are rated up to 70 psi (5 bar)
and 158°F (70°C). Use a coolant fluid that is compatible with the water cooler and the gun.
Tools required:
• 3/8" wrench
• 5/16" nut driver
• medium flat bladed screw driver
• cutting tool
5. Install the fitting and hose assembly to the case
front. Route the hoses along the bottom of the
inner module and out through the cutout of the
cover. Slide the module back into the case.
1. Turn power off at the welding power source.
2. Remove the screws securing the case to the inner
module using a 3/8" wrench.
6. Secure the module to the case with the screws.
(Shown in Step 2)
7. Install the fitting assembly to the rear of the case
200
0
1
here
joo
e
200
0
was
1
here
was
joe
3. Remove the module from the case by lifting the
front of the module approximately .25" (6 mm) and
then sliding forward.
ALUMINUM CASE
PLASTIC CASE
8. Slide the hose clamps on to the hoses. Trim the
hoses to length so that they lay flat on the case bottom. Slide hose clamps on the hose. Slide the
hoses on to the fittings on the case rear and secure
with the hose clamps.
LN-25™ PRO ACROSS THE ARC MODEL
D-1
MAINTENANCE
D-1
SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the
welding power source before
installation or changing drive
rolls and/or guides.
• Do not touch electrically live
parts.
• When inching with the gun trigger, electrode
and drive mechanism are "hot" to work and
ground and could remain energized several
seconds after the gun trigger is released.
• Do not operate with covers, panels or guards
removed or open.
• Only qualified personnel should perform maintenance work.
----------------------------------------------------------------------
ROUTINE MAINTENANCE
5. Energize the output circuit of the power source.
Adjust the power source output to 20±1 VDC as
measured on the reference meter.
6. Verify that LN-25™ PRO voltmeter reads between
19 and 21 volts.
If the voltmeter reading is out of range, check for
loose connections or replace the voltmeter. There is
no calibration adjustment for the LN-25™ PRO voltmeter.
Flow Meter Validation
Tools required:
• Flow meter reference standard.
• Constant voltage DC welding power source (DC400, V-350, CV-400 or equivalent).
To verify the flow meter accuracy:
• Check weld cables, control cables and gas hoses
for cuts.
• Clean and tighten all weld terminals.
PERIODIC MAINTENANCE
• Clean drive rolls and inner wire guide and replace if
worn.
• Blow out or vacuum the inside of the feeder.
1. Turn power OFF.
2. Connect the LN-25™ PRO to the constant voltage
DC welding power source. The work lead of the
LN-25™ PRO must be connected to the work terminal of the power source.
CALIBRATION SPECIFICATION
3. Connect a supply of CO2 to the wire feeder. Do
not exceed the maximum inlet pressure of the wire
feeder.
Voltmeter Validation, Across the Arc Analog Meter
Models
4. Disconnect the shielding gas hose that connects to
the gun bushing.
Tools required:
• DC voltmeter reference standard
• Constant voltage DC welding power source with
adjustable no-load voltage (DC-400, V-350, CV-400
or equivalent).
5. Connect the shielding gas hose to flow meter reference standard.
To verify the analog voltmeter accuracy:
1. Turn power OFF.
2. Connect the LN-25™ PRO ACROSS THE ARC
MODEL to the constant voltage DC welding power
source. The work lead of the LN-25™ PRO must
be connected to the work terminal of the power
source.
6. Orient the LN-25™ PRO in a vertical position.
7. Turn power ON.
8. Adjust the flow meter on the LN-25™ PRO to 40
scfh while pressing the GAS PURGE button.
9. Measure the gas flow with the calibrated flow
meter while pressing the GAS PURGE button.
10. The measured flow rate should be between 35
and 45 scfh.
3. Connect the reference voltmeter between the
brass block of the LN-25™ PRO and the work
lead.
4. Turn power ON.
LN-25™ PRO ACROSS THE ARC MODEL
D-2
D-2
MAINTENANCE
The LN-25™ PRO flow meter cannot be calibrated. If
the flow meter reads incorrectly, check for leaks or
kinks in the gas hose. Replace the flow meter if necessary.
Wire Feed Speed Validation
(See Figure D.1)
Calibration of the LN-25™ PRO may be required when
the p.c. board, wire feed speed potentiometer or motor is
replaced or serviced. Calibration matches the scale on
the name plate to the actual wire feed speed.
To change the wire feed speed calibration:
(See Figure D.2)
Tools required:
• 5/16" nut driver
• RPM meter
• Shorting plug. The shorting plug shorts pins 4 & 8 of
connector J3 on the Control P.C. Board. J3 is a 8 pin
molex connector.
1. Turn power OFF.
Tools required:
• RPM meter
• Constant voltage DC welding power source (DC-400,
V-350, CV-400 or equivalent)
• 7/16" open end wrench
2. Remove the 4 screws holding the rear cover inside
the feeder and remove the cover.
3. Open the idle arm.
To verify if calibration is necessary:
4. Set the wire feed speed per the table.
1. Turn power OFF.
Model gearing Wire Feed Speed
Standard Speed 400 in/min
Extra Torque
150 in/min
2. Set the wire feed speed per the table.
Model gearing Wire Feed Speed Acceptable Range
Standard Speed 400 in/min
69 - 77 rpm
Extra Torque
150 in/min
25 - 31 rpm
3. Remove the plastic cover from the lower portion of the
wire drive with a 7/16" wrench.
4. Connect the LN-25™ PRO to the constant voltage DC
welding power source. The work lead of the LN-25™
PRO must be connected to the work terminal of the
power source.
5. Connect the LN-25™ PRO to the constant voltage DC
welding power source. The work lead of the LN-25™
PRO must be connected to the work terminal of the
power source.
6. Turn power ON.
7. Insert the shorting plug into connector J3 on the
Control P.C. Board. The shorting plug shorts pins 4
& 8.
8. Remove the shorting plug.
5. Turn power ON.
9. Turn power OFF.
6. Measure the motor rpm when the COLD FEED button
is pressed.
10. Replace the cover and secure with the screws.
7. Verify the rpm is within the acceptable range.
FIGURE D.2
FIGURE D.1
COVER
MOTOR
SHAFT
COVER
P.C. BOARD
LN-25™ PRO ACROSS THE ARC MODEL
E-1
TROUBLESHOOTING
E-1
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.
__________________________________________________________________________
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 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.
Step 2. POSSIBLE CAUSE.
The second column labeled “POSSIBLE CAUSE” lists
the obvious external possibilities that may contribute
to the machine symptom.
WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the welding power source before installation or changing
drive rolls and/or guides.
• Do not touch electrically live parts.
• When inching with the gun trigger, electrode and drive mechanism are "hot" to work
and ground and could remain energized several seconds after the gun trigger is
released.
• Welding power source must be connected to system ground per the National Electrical
Code or any applicable local codes.
• Only qualified personnel should perform maintenance work.
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-25™ PRO ACROSS THE ARC MODEL
E-2
E-2
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Fault Code
Digital Display Models Error Codes
Description
Possible Adjustments
Err 81 Motor overload, long term.
1. The wire drive motor has over- 1. Check that the electrode slides
easily through the gun and cable.
heated.
2. Remove tight bends from the gun
and cable.
3. Check that the spindle brake is
not too tight.
4. Verify a high quality electrode is
being used.
5. Wait for the error to reset and the
motor to cool (approximately 1
minute).
Err 82 Motor overload, short term.
1. The wire drive motor current draw 1. Check that motor can turn freely
has exceeded limits, usually when idle arm is open.
because the motor is in a locked 2. Verify that the gears are free of
debris and dirt.
rotor state.
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-25™ PRO ACROSS THE ARC MODEL
E-3
E-3
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
Output Problems
The feeder does power up - no dis- 1. The work sense lead is disconplay, no cold feed.
nected or is a poor electrical connection. (Across the arc models)
2. The power source is OFF.
3. The circuit breaker for the wire
feeder on power source have
tripped. (control cable models)
4. The control cable may be loose or
damaged. (control cable models)
RECOMMENDED
COURSE OF ACTION
1. Connect the work sense lead to
the work in a location free of dirt,
rust and paint.
2. Turn ON the power source.
3. Reset the circuit breakers.
4. Tighten, repair or replace the control cable.
The wire feeder power up but there 1. The contactor coil connections are 1. Verify the contactor coil connecis no output when the trigger is loose.
tions.
pulled. The shielding gas is flowing 2. The contactor has failed.
2. Replace the contactor.
and the drive rolls turn.
No shielding gas.
1. The gas supply is OFF or empty.
1. Verify the gas supply is ON and
flowing.
2. The gas hose is cut or crushed
2. Route the gas hose so it avoids
sharp corners and make sure
nothing is on top of it. Repair or
replace damaged hoses.
3. The flow meter valve is closed.
3. Open the flow meter valve.
4. Dirt or debris is in the solenoid.
4. Apply filtered shop at 80psi to the
solenoid to remove dirt.
5. There is a loose solenoid connec- 5. Remove the cover and check that
tion.
all connections are in good condition.
6. The solenoid has failed.
Inconsistent wire feeding or wire not 1. The gun cable is kinked and/or 1. Keep the gun cable as straight as
feeding but drive rolls turning.
twisted
possible. Avoid sharp corners or
bends in the cable.
2. The wire is jammed in the gun and 2. Remove the gun from the wire
cable.
feeder and pull the jammed wire
out of the gun and cable.
3. The gun liner is dirty or worn.
3. Blow dirt out of the liner with low
pressure (40psi or less). Replace
the liner if worn.
4. The electrode is rusty or dirty.
4. Use only clean electrode. Use
quality electrode, like L-50 or L-56
from Lincoln Electric.
5. The contact tip is partially melted 5. Replace the contact tip.
or has spatter.
6. Improper gun liner, tip, drive rolls 6. Verify the proper parts are
and/or inner wire guide.
installed.
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-25™ PRO ACROSS THE ARC MODEL
E-4
E-4
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Output Problems
7. Incorrect tension arm pressure on 7. Adjust the tension arm per the
the drive rolls.
Instruction Manual. Most electrodes feed well at a tension arm
setting of "3".
8. The spindle brake is too tight.
8. Verify the spool of wire moves
with minimal effort.
9. Worn drive roll
9. Replace the drive rolls if worn or
filled with dirt.
Wire feed speed consistently oper- 1. The jumper lead for normal 1. Properly connect the normal
ates at the wrong value. The speed speed/extra torque is connected
speed/extra torque jumper.
changes when the wire feed speed improperly.
2. Install the proper pinion gear in
knob is adjusted.
2. The wrong gear is installed in the the wire drive.
wire drive.
3. Replace the motor/gearbox
3. The brushes on the motor are assembly.
worn.
The wire feed speed stuck at 200- 1. The tachometer is connected 1. Verify all of the tachometer leads
300 in/min and there is no change improperly.
are properly connected.
when the wire feed speed knob is 2. The tachometer has failed.
2. Replace the motor and tachomeadjusted.
ter assembly.
Variable or "hunting" arc.
1. Wrong size, worn and/or melted 1. Replace the contact tip.
contact tip.
2. Worn work cable or poor work 2. Verify all work and electrode conconnection.
nections are tight and that the
cables are in good condition.
Clean/replace as necessary.
3. Wrong polarity.
3. Adjust polarity to the recommended procedure.
4. The gas nozzle is extended 4. Adjust the gas nozzle and shorten
beyond the contact tip or the wire the stickout to 3/8 to 1/2 inches.
stickout is too long.
5. Poor gas shielding on processes 5. Check gas flow and mixture.
requiring gas.
Remove or block sources of
drafts.
(Digital display models)
1. The Run-In switch is "ON"
When the trigger is pulled, the wire
feeds slowly.
1. Use the set-up Push-button to turn
Run-in OFF.
Poor arc starts with sticking or 1. Improper procedures or tech- 1. See "Gas Metal Arc Welding
"blast-offs", weld porosity, narrow niques.
Guide" (GS-100)
and ropy looking bead.
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-25™ PRO ACROSS THE ARC MODEL
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.
F-1
DIAGRAMS
LN-25™ PRO ACROSS THE ARC MODEL
F-1
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.
F-2
DIAGRAMS
LN-25™ PRO ACROSS THE ARC MODEL
F-2
17.19
16” CIRCLE
12” x 18” ELLIPSE
8.65
14.81
23.17
71.32
18.41
56.8
EL C R I C ” 61
ESPILLE ”81 x ”21
9 1 .7 1
F-3
DIMENSION PRINT
LN-25™ PRO ACROSS THE ARC MODEL
F-3
NOTES
LN-25™ PRO ACROSS THE ARC MODEL
• Do not touch electrically live parts or
WARNING
Spanish
AVISO DE
PRECAUCION
French
ATTENTION
German
WARNUNG
Portuguese
ATENÇÃO
• Keep flammable materials away.
• Wear eye, ear and body protection.
• Mantenga el material combustible
• Protéjase los ojos, los oídos y el
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.
• 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
fuera del área de trabajo.
• Gardez à l’écart de tout matériel
inflammable.
• Entfernen Sie brennbarres Material!
Teile oder Elektroden mit Ihrem
Körper oder feuchter Kleidung!
• Isolieren Sie sich von den
Elektroden und dem Erdboden!
• Não toque partes elétricas e electro-
dos com a pele ou roupa molhada.
• Isole-se da peça e terra.
cuerpo.
• Protégez vos yeux, vos oreilles et
votre corps.
• Tragen Sie Augen-, Ohren- und Kör-
perschutz!
• Mantenha inflamáveis bem guarda-
dos.
• Use proteção para a vista, ouvido e
corpo.
Japanese
Chinese
Korean
Arabic
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
• Turn power off before servicing.
• Do not operate with panel open or
guards off.
remove fumes from breathing zone.
• 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-
• Desconectar el cable de ali-
mentación de poder de la máquina
antes de iniciar cualquier servicio.
• Débranchez le courant avant l’entre-
tien.
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.
• Strom vor Wartungsarbeiten
abschalten! (Netzstrom völlig öffnen;
Maschine anhalten!)
• 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!
• Não opere com as tampas removidas.
• Desligue a corrente antes de fazer
• Mantenha-se afastado das partes
serviço.
• Não toque as partes elétricas nuas.
• Não opere com os paineis abertos
moventes.
WARNING
Spanish
AVISO DE
PRECAUCION
French
ATTENTION
German
WARNUNG
Portuguese
ATENÇÃO
ou guardas removidas.
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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