Lincoln Electric IM872 User Manual
LF-74 WIRE FEEDER
RETURN TO MAIN MENU
IM872-B
February 2013
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, OPER-
ATE OR REPAIR THIS EQUIPMENT WITHOUT READING
THIS MANUAL AND THE
SAFETY PRECAUTIONS CONTAINED THROUGHOUT. And,
most importantly, think before you
act and be careful.
11195, 11196, 11197, 11610, 11611
11712, 11713
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com
IP21
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 •
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.
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
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.
3.j. Also see Items 6.c. and 8.
skin or wet clothing. Wear dry, hole-free
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
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
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.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.
ventilation and/or exhaust at the arc to keep
vapors
to
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.
iii
SAFETY
iii
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
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
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.
the welding sparks from starting a fire.
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.
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.
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 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.
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
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.
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.
Thank You
vv
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!
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.
CUSTOMER ASSISTANCE POLICY
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
“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
TABLE OF CONTENTS
Page
Installation .......................................................................................................Section A
Technical Specifications ........................................................................................A-1
Safety Precautions.................................................................................................A-2
Location...........................................................................................................A-2
Mounting .........................................................................................................A-2
Bench Mount ...................................................................................................A-3
Swivel Mount...................................................................................................A-3
Boom Mount....................................................................................................A-3
Suspended ......................................................................................................A-3
Weld Cable Sizes............................................................................................A-4
Coaxial Weld Cables.......................................................................................A-5
Weld Cable Connections.................................................................................A-5
Analog Control Cable Connections........................................................................A-6
Analog Miller Control Cable Adapter .....................................................................A-7
Welding Gun/Wire Feeder Trigger Connector.................................................A-8
High Frequency Protection..............................................................................A-8
Remote Sense Lead Specifications ................................................................A-8
Wire Drive Systems ...............................................................................................A-8
Welding Guns, Torches and Accessories..............................................................A-9
Wire Drive Configuration......................................................................................A-10
Assembly of Drive Rolls and Wire Guides...........................................................A-11
Pressure Arm Adjustment....................................................................................A-12
Shielding Gas Connection ...................................................................................A-13
Wire Reel Loading.........................................................................................A-14
Weld Wire Routing ........................................................................................A-15
Installing Electrode Conduit Kits..........................................................................A-16
Aluminum Wire Preparations...............................................................................A-17
Base Model, Bench Model and Extra Torque Bench Model................................A-18
Common Equipment Set-Ups..............................................................................A-19
High Volume Production......................................................................................A-20
Portable Welding .................................................................................................A-21
___________________________________________________________________________
Operation .........................................................................................................Section B
Safety Precautions.................................................................................................B-1
Graphic Symbols ...................................................................................................B-1
Common Welding Abbreviations ...........................................................................B-1
Product Description ...............................................................................................B-2
Recommended Processes and Required Equipment............................................B-2
Front Panel Controls and Connections..................................................................B-3
1. Wire Feed Speed Knob...............................................................................B-4
2. Remote Voltage Control Kit (Optional)........................................................B-4
3. Burnback and Postflow Timer Kit (Optional) ...............................................B-4
4. Thermal LED, Motor Overload ....................................................................B-4
5. Cold Feed/Gas Purge Switch......................................................................B-4
6. 2 Step - Trigger Interlock Switch .................................................................B-5
7. Gun Receiver Bushing ................................................................................B-5
8. Trigger Connector 5-Pin Amphenol.............................................................B-5
___________________________________________________________________________
Accessories.....................................................................................................Section C
General Options / Accessories................................................................C-1 thru C-4
___________________________________________________________________________
vi
vii
TABLE OF CONTENTS
Page
Maintenance ....................................................................................................Section D
Safety Precautions ................................................................................................D-1
Routine ..................................................................................................................D-1
Periodic..................................................................................................................D-1
Calibration Specification ................................................................................D-1, D-2
________________________________________________________________________
Troubleshooting............................................................................................................E
Safety Precautions.................................................................................................E-1
How To Use Troubleshooting Guide......................................................................E-1
Troubleshooting .............................................................................................E-2, E-3
________________________________________________________________________
Wiring Diagram and Dimension Prints..........................................................Section F
________________________________________________________________________
Parts Lists...............................................................................................................P-518
________________________________________________________________________
vii
LF-74
A-1
INSTALLATION
TECHNICAL SPECIFICATIONS: LF-74 Wire Feeder
SPEC.# TYPE WIRE FEED SPEED RANGE
Model
Gearing
GMAW FCAW
A-1
K2426-1
K2426-4
K2426-2
K2426-5
K2426-3
Normal Speed
Normal Speed
Extra Torque
SPEC.# TYPE
K2426-1
K2426-4
K2426-2
K2426-5
K2426-3
LF-74 11.1“ 10.2“ 12.9“ 46 Lbs.
Base Model
LF-74
Bench 9 AMPS ( 389 mm) (330 mm) (704 mm) (32.0 Kg.) (-10°C to 40°C) (-40°C to 85°C)
Heavy 50/60 Hz
Duty
LF-74
Bench 15.3“ 13.0“ 27.7“ 70.5 Lbs.
Heavy ( 389 mm) (330 mm) (704 mm) (32.0 Kg.)
Duty
Extra Torque
WFS Range
100 – 800 ipm
(2.5-20.3 m/min.)
50 – 800 ipm
(1.27-20.3 m/min.)
100 – 800 ipm
(2.5-20.3 m/min.)
50 – 800 ipm
(1.27-20.3 m/min.)
50 – 400 ipm
(1.3 – 10.4m/min)
Wire Sizes
.023 – 1/16"
(0.6 – 1.6mm)
.023 – 1/16"
(0.6 – 1.6mm)
.023 – 1/16"
(0.6 – 1.6mm)
WFS Range
100 – 800 ipm
(2.5-20.3 m/min.)
50 – 800 ipm
(1.27-20.3 m/min.)
100 – 800 ipm
(2.5-20.3 m/min.)
50 – 800 ipm
(1.27-20.3 m/min.)
50 – 400 ipm
(1.3 – 10.4m/min)
Wire Sizes
.030 - 5/64”
(0.8 - 2.0mm)
.030 – 5/64"
(0.8 – 2.0mm)
.030 – 3/32"
(0.8 - 2.4mm)
CONTROL BOX, WIRE DRIVE AND COMPLETE UNITS
INPUT POWER
Input Voltage Dimensions
and Current Height Width Depth Weight Operating Storage
( 282 mm) (259 mm) (328 mm) (20.9 Kg.)
Height Width Depth Weight
24-42VAC 15.3“ 13.0“ 27.7“ 70.5 Lbs. 14°F to 104°F -40°F to 185°F
Height Width Depth Weight
PHYSICAL SIZE• TEMPERATURE RATING
Dimensions Δ
Dimensions Δ
WELDING CAPACITY RATING
Amp Rating Duty Cycle
600 A 60%
Δ Dimensions do not include wire reel.
Model
K2426-1
Description
Base Model
K2426-4
K2426-2
K2426-5
Bench Model with
Heavy Duty Wire
Stand
K2426-3
Extra Torque
Model with Heavy
Duty Wire Stand
ITEMS INCLUDED WITH EACH PRODUCT
Wire Feeder
Wire Reel Stand
-----------
LF-74
Heavy Duty, up to 60lb.
(27.k kg) Coils
LF-74
Drive Roll Kit
.035, .045 Combo
(0.9, 1.2mm)
Control Cable
10Ft. (3m)
A-2
5/8-16
THREADS
(4 PLACES)
1/4-20
THREADS
(4 PLACES)
5/16-18
THREADS
(4 PLACES)
MOUNTING FEET
SECURED WITH
#10-24 SCREWS
(4 PLACES)
INSTALLATION
A-2
SAFETY PRECAUTION
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.
----------------------------------------------------------------------------------------
LOCATION
The LF-74 may be placed on a bench, mounted on
top of a welding power source or assembled to an
appropriate boom.
MOUNTING
For location and size,
Mounting Holes (See Figure A.1) and for
Mounting Holes (See Figure A.2).
5/8-16
THREADS
(4 PLACES)
LF-74 Bench Model Rear
FIGURE A.1
Bottom
Place the LF-74 in a clean and dry location.
Do not stack the LF-74.
1/4-20
THREADS
(4 PLACES)
5/16-18
THREADS
(4 PLACES)
FIGURE A.2
MOUNTING FEET
SECURED WITH
#10-24 SCREWS
(4 PLACES)
LF-74
A-3
INSTALLATION
A-3
BENCH MOUNT
The LF-74 mounts in a variety of configurations. As
shipped from the factory, the LF-74 is suitable for
bench mounting or placing directly on top of the welding power source (CV-xxx and DC-xxx product family
only).
Bench Mount
SWIVEL MOUNT
The base model and heavy duty bench models may
be mounted onto a swivel when a top a welding power
source.
BOOM MOUNT
When boom mounting, remove the wire reel stand (if
assembled) and secure the wire feeder directly to the
desired surface.
SUSPENDED
Only suspend the wire feeder by the handle/lift bail of
the portability kit.
K2426-1 shown with K2328-1Standard Duty Wire
Reel Stand and K2331-1 Lift Bail
K1557-1Swivel Kit and Bench Model, with Heavy
Duty Wire Reel Stand.
K2332-1 Swivel Kit and Base Model LF-74
WARNING
Alternative methods for hanging the wire feeder
must not be used unless insulation is provided
between the wire feeder enclosure and the hanging device.
------------------------------------------------------------------------
LF-74
A-4
INSTALLATION
SAFETY PRECAUTION
ELECTRIC SHOCK can
kill.
• Only qualified personnel should
perform this installation.
• Turn off the input power to the power source at
the disconnect switch or fuse box before working on this equipment. Turn off the input power
to any other equipment connected to the welding system at the disconnect switch or fuse
box before working on this equipment.
• Do not touch electrically hot parts.
----------------------------------------------------------------------
WELD CABLE SIZES
Table A.1 has the 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 voltage in the welding circuit.
A-4
Amperes
200
200
225
225
250
250
250
250
300
325
350
400
400
500
TABLE A.1
RECOMMENDED CABLE SIZES (RUBBER COVERED COPPER - RATED 75°C)**
CABLE SIZES FOR COMBINED LENGTHS OF ELECTRODE AND WORK CABLES
Percent
Duty
Cycle
60
100
20
40 & 30
30
40
60
100
60
100
60
60
100
60
0 to 50 Ft.
0 to 15 m
2
2
4 or 5
3
3
2
1
1
1
2/0
1/0
2/0
3/0
2/0
50 to 100Ft.
15 to 31 m
2
2
3
3
3
2
1
1
1
2/0
1/0
2/0
3/0
2/0
100 to 150 Ft.
31 to 48 m
2
2
2
2
2
1
1
1
1
2/0
2/0
2/0
3/0
3/0
150 to 200 Ft.
48 to 61 m
1
1
1
1
1
1
1
1
1/0
2/0
2/0
3/0
3/0
3/0
200 to 250 Ft.
61 to 76 m
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 40°C and below. Applications above 40°C
may require cables larger than recommended, or cables rated higher than 75°C.
LF-74
A-5
INSTALLATION
A-5
COAXIAL WELD CABLES
Coaxial welding cables are specially designed welding
cables for pulse welding welding. Coaxial weld cables
feature low inductance, allowing fast changes in the
weld current. Regular cables have a higher inductance which may distort the pulse wave shape.
Inductance becomes more severe as the weld cables
become longer.
Coaxial weld cables are recommended for all pulse
welding, especially when the total weld cable length
(electrode cable + work cable) exceeds 50 feet
(7.6m).
A coaxial weld cable is constructed by 8 small leads
wrapped around one large lead. The large inner lead
connects to the electrode stud on the power source
and the electrode connection on the wire feeder. The
small leads combine together to form the work lead,
one end attached to the power source and the other
end to the work piece.
(See Coaxial weld Cable below.)
WELD 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.
Work
Power Source
Work
Electrode
Electrode
Work
Wire Feeder
Coaxial Weld Cable
Electrode
Work
LF-74
A-6
INSTALLATION
ANALOG CONTROL CABLE
CONTROL CABLE CONNECTIONS
K1797-xx
The control cable connecting the wire feeder to the
power source is specially made for the welding environment.
The wire feeder power requires overcurrent protection. Connect the wire feeder only to power sources
with overcurrent protection of no more than 15 amps.
WIRE FEEDERPOWER SOURCE
J
A
J
I
N
H
G
F
B
K
L
C
D
M
E
A
B
C
D
E
I
K
L
H
N
M
G
F
A-6
PIN FUNCTION LEAD#
A Reserved ------B Reserved ------C Welding Output Control 2
(trigger from feeder)
D Welding Output Control 4
(trigger from feeder)
E Remote Voltage Control 77
(“+” supply from feeder or remote)
F Remote Voltage Control 76
(control signal from feeder or remote)
G Remote Voltage Control 75
(“-” supply from feeder or remote)
H Reserved
I 42 VAC 41
J Reserved
K 42 VAC 42
L Reserved
M Reserved ------N Electrode voltage from feeder 67
Do not use more than 100 ft (30.5 m) of control cable
between the wire feeder and power source.
LF-74
A-7
INSTALLATION
ANALOG MILLER CONTROL CABLE
ADAPTER K2335-1
This Lincoln Electric wire feeder may be mounted to a
limited number of Miller Electric power sources. The
Miller power source must have the circular connector
pin definition shown in the table below for proper operation of the wire feeder. Be sure the Miller power
source provides 24 VAC to the wire feeder and has
overcurrent protection of no more than 15 amps. The
power source must not exceed 113VDC peak.
Operation of Lincoln wire feeders on Miller power
sources may result in lack of high wire feed speeds or
reduced pull force at high wire feed speeds.
Approximate maximum WFS for Lincoln wire feeders
operating with 24 VAC:
A-7
LF-72
LF-74
LF-74, extra torque
A
J
I
H
G
B
K
N
L
C
D
M
F
E
MILLER POWER SOURCE
Pin Function
A 24 VAC to feeder
B Welding Output Control
C +10VDC to feeder for remote control
D Remote control common
E 0-10VDC from feeder for remote control.
F Current feedback to feeder.
Scaled 0-10V. 1 V = 100 amps.
Referenced to pin D.
G 24 VAC common.
H Arc Voltage feedback to feeder.
Scaled 0-10V. 1 V = 10 Arc volts.
Referenced to pin D.
720 ipm
720 ipm
360 ipm
WIRE FEEDERPOWER SOURCE
J
A
B
C
D
I
K
L
E
H
N
M
G
F
LINCOLN WIRE FEEDER
Pin Function
I 42 VAC feeder
D Welding Output Control
C Welding Output Control
E Remote Voltage Control ("+" supply, from
power source)
G Remote Voltage Control ("-" supply, from
power source)
F Remote Voltage Control (control signal from
feeder or remote.)
J Reserved for future use.
K 42 VAC to feeder
L Reserved for future use.
N
Miller is a registered trademark not owned or licensed by The Lincoln Electric Company.
N Electrode voltage to power source (67)
LF-74
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