Lincoln Electric LF-72, IM847-D User Manual

LF-72 WIRE FEEDER

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IM847-D

March, 2010

For use with machines having Code Numbers:

Safety Depends on You

Lincoln arc welding and cutting equipment is designed and built wi th saf ety in mind. Ho wever, you r over a l l sa f e ty ca n be increased by proper installation ... and thoughtful operation on your part. DO NOT INSTALL, OPER-

ATE OR REPAIR THIS EQUIPMEN T WITHO U T REA D I NG THIS MANUAL AND THE SAFETY PRECAUTIONS CONTAINED THR O U GHOUT . And , most

importantly, think before you act and be careful.

11075, 11076, 11077 11209, 11210, 11211, 11227 11290, 11291, 11292, 11293 11606, 11607, 11608, 11609 11708, 11709, 11710, 11711

Cleveland, Ohio 44117-1199 U.S.A. TEL: 1.888.935.3877 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

IP21

IEC 60974-5

OPERATOR’S MANUAL

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

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

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.

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1.c. Do not add the fuel n ear an open f la me 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 con tact with ho t 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. I n some cases it may b e necessary t o remove sa fe ty

gu a rds to pe rfo r m re quir ed ma int e nan c e. Remo v e guards only when necessary and replace them when the ma i nten ance re q uiri ng thei r r e mov a l i s c omp l ete . 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. Elect ric c urrent flowi ng through any condu ctor causes local ized Ele ctric and Mag netic Fiel ds (EMF). Welding curre nt creat es EMF fields around wel ding cab les and welding machines

2.b. EMF fi el ds may interfere w it h som e pacemakers, a nd 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. Nev er coil the electrode lea d aro un d 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.

SAFETY

ELE CTRIC S HOCK 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 cl othing. Wear dry, hole-f ree

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 mu s t be pe r for m ed un der el ect r ica l ly ha zard ous con ditions (in damp locations or whil e 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, elect rode reel, we lding head, nozzle or semiauto matic 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. N ev er s im ultaneo us ly touch electri ca ll y “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.

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 an d gases hazardous to health. Avoid breathing these fumes and gases. When welding , kee p your head out of the fume. Use enou gh ventilation and/or exhaust at the arc to keep

fumes and gases away from the breathing zone. When

we l ding w ith e lect rode s whi c h req u ire s pec i al ve n til atio n su c h as st ain les s or ha r d fa cing (see in str uct ion s on con tai ner or MS DS) or on lea d or cadmi um plated steel and othe r 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 o r in some circumst a nce s, ou tdoo rs, a r espi rat o r ma y be re quir ed. 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 i nj ur y or death. Always use eno ug h ven ti la ti on , especially in confined areas, to insure breathing air is safe.

vapors

5.e. Read and understand the manufacturer’s instructions for this

equipment and the consumables to be used, including the ma t eria l s afe t y data s h eet ( M SDS ) a n d fol l ow you r employer’s safety practices. MSDS forms are available from yo u r weld i ng d i str i buto r or from th e manuf actu rer.

5.f. Also see item 1.b.

Jan ‘09

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

Re m embe r th a t we l din g spa r ks an d ho t materials from welding can easily go through small cracks an d op ening s to adj acent are as. Avoid wel din g 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 Standar d Z49.1) and the operat ing informat ion 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 Co n tain ers a nd P i pin g That H ave He ld H a zar d ous 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 incre ase the possi bility 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 w el di ng sp ar ks fr om starti ng a fire.

though

they have

Preparation

for Welding and Cutting of

CYLINDER may explode if damaged.

7.a. U s e onl y com p res s ed ga s cyl i nde r s containing the correct shielding gas for the pr o cess use d an d pro perl y op e rat i ng re g ulat ors de s ign e d for th e gas an d

pressure used. All hoses, fittings, etc. should be suitable for the application and maintained in good condition.

7.b. A lw ay s keep cylinders i n an upright pos it io n 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. R ea d an d foll ow t he i ns tru ct ions on co mp resse d ga s 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. Inst all equipment in accordance with the U.S. National Electrical Code, all local c odes a nd 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.

Jan ‘09

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 L’Arc

1. Protegez-vous contre la secousse électrique:

a. Les circuits à l’électrode et à la piéce sont sous tension

quand la machine à souder est en marche. Eviter toujours tout contact entre les parties sous tension et la peau nue ou les vétements mouillés. Porter des gants secs et sans trous pour isoler les mains.

b. Faire trés attention de bien s’isoler de la masse quand on

soude dans des endroits humides, ou sur un plancher metallique ou des grilles metalliques, principalement dans les positions assis ou couché pour lesquelles une grande partie du corps peut être en contact avec la masse.

c. Maintenir le porte-électrode, la pince de masse, le câble

de soudage et la machine à souder en bon et sûr état defonctionnement.

d.Ne jamais plonger le porte-électrode dans l’eau pour le

refroidir.

e. Ne jamais toucher simultanément les parties sous tension

des porte-électrodes connectés à deux machines à souder parce que la tension entre les deux pinces peut être le total de la tension à vide des deux machines.

f. Si on utilise la machine à souder comme une source de

courant pour soudage semi-automatique, ces precautions pour le porte-électrode s’applicuent aussi au pistolet de soudage.

2. Dans le cas de travail au dessus du niveau du sol, se protéger contre les chutes dans le cas ou on recoit un choc. Ne jamais enrouler le câble-électrode autour de n’importe quelle partie du corps.

5. Toujours porter des lunettes de sécurité dans la zone de soudage. Utiliser des lunettes avec écrans lateraux dans les zones où l’on pique le laitier.

6. Eloigner les matériaux inflammables ou les recouvrir afin de prévenir tout risque d’incendie dû aux étincelles.

7. Quand on ne soude pas, poser la pince à une endroit isolé de la mas se. Un c ourt-circuit acciden tal peut provoquer un échauffement et un risque d’incendie.

8. S’assurer que la masse est connectée le plus prés possible de la zone de travail qu’il est pratique de le faire. Si on place la masse sur la charpente de la construction ou d’autres endroits éloignés de la zone de travail, on augmente le risque de voir passer le courant de soudage par les chaines de levage, câbles de grue, ou autres circuits. Cela peut provoquer des risques d’incendie ou d’echauffement des chaines et des câbles jusqu’à ce qu’ils se rompent.

9. Assurer une ventilation suffisante dans la zone de soudage. Ceci est particuliérement important pour le soudage de tôles galvanisées plombées, ou cadmiées ou tout autre métal qui produit des fumeés toxiques.

10. Ne pas souder en présence de vapeurs de chlore provenant d’opérations de dégraissage, nettoyage ou pi stolage. La chaleur ou les rayons de l’arc peuvent réagir avec les vapeurs du solvant pour produire du phosgéne (gas fortement toxique) ou autres produits irritants.

11. Pour obtenir de plus amples renseignements sur la sûreté, voir le code “Code for safety in welding and cutting” CSA Standard W 117.2-1974.

PRÉCAUTIONS DE SÛRETÉ POUR

3. Un coup d’arc peut être plus sévère qu’un coup de soliel, donc:

a. Utiliser un bon masque avec un verre filtrant approprié

ainsi qu’un verre blanc afin de se protéger les yeux du rayonnement de l’arc et des projections quand on soude ou quand on regarde l’arc.

b. Porter des vêtements convenables afin de protéger la

peau de soudeur et des aides contre le rayonnement de l‘arc.

c. Protéger l’aut re pe rs onnel t ra vaillant à p ro ximité au

soudage à l’aide d’écrans appropriés et non-inflammables.

4. De s g outte s de laitier en fusion sont émises de l’arc de soudage. Se protéger avec des vêtements de protection libres de l’huile, tels que les gants en cuir, chemise épaisse, pantalons sans revers, et chaussures montantes.

LES MACHINES À SOUDER À TRANSFORMATEUR ET À REDRESSEUR

1. Relier à la terre le chassis du poste conformement au code de l’électricité et aux recommendations du fabricant. Le dispositif de montage ou la piece à souder doit être branché à une bonne mise à la terre.

2. Autant que possible, I’installation et l’entretien du poste seront effectués par un électricien qualifié.

3. Avant de faires des travaux à l’interieur de poste, la debrancher à l’interrupteur à la boite de fusibles.

4. Garder tous les couvercles et dispositifs de sûreté à leur place.

Mar. ‘93

TThhaannkk YYoouu

TABLE OF CONTENTS

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 customer’s 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.

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

Procedure for Changing Drive and Idle Roll Sets.......................................................A-10

Wire Drive Configuration..............................................................................A-10, A-11

Pressure Arm Adjustment......................................................................................A-11

Wire Reel Loading .................................................................................................A-12

Weld Wire Routing.................................................................................................A-13

Shielding Gas Connections ........................................................................................A-14

Installing Electrode Conduit Kits.................................................................................A-15

Aluminum Wire Preparations......................................................................................A-16

Base Model, Bench Model Standard Duty and Bench Model Heavy Duty .................A-17

Typical System Configurations ...................................................................................A-18

__________________________________________________________________________

Operation ..............................................................................................................Section B

Safety Precautions........................................................................................................B-1

Graphic Symbols...........................................................................................................B-1

Common Welding Abbreviations...................................................................................B-2

Product Description.......................................................................................................B-2

Recommended Processes and Required Equipment ...................................................B-2

Front Panel Controls and Connections .........................................................................B-3

1. Remote Voltage Control Kit (Optional).................................................................B-4

2. Burnback and Postflow Timer Kit (Optional) ........................................................B-4

3. Thermal LED, Motor Overload .............................................................................B-4

4. Cold Feed/Gas Purge Switch...............................................................................B-4

5. 2 Step - Trigger Interlock Switch ..................................................................B-4, B-5

6. Wire Feed Speed Knob........................................................................................B-5

7. Gun Receiver Bushing .........................................................................................B-5

8. Trigger Connector 5-Pin Amphenol .....................................................................B-5

__________________________________________________________________________

Accessories ..........................................................................................................Section C

General Options and Accessories ..................................................................C-1 Thru C4

___________________________________________________________________________________

vii

TABLE OF CONTENTS

Page

Maintenance ....................................................................................................Section D

Safety Precautions ................................................................................................D-1

Routine Maintenance.............................................................................................D-1

Periodic Maintenance............................................................................................D-1

Calibration Specification........................................................................................D-1

Major Component Locations..................................................................................D-2

________________________________________________________________________

Troubleshooting..............................................................................................Section E

Safety Precautions.................................................................................................E-1

How To Use Troubleshooting Guide......................................................................E-1

Troubleshooting Guides.................................................................................E-2, E-3

________________________________________________________________________

Wiring Diagram and Dimension Prints..........................................................Section F

________________________________________________________________________

Parts Lists.............................................................................................P-501 and P-622

________________________________________________________________________

vii

LF-72

A-1

TECHNICAL SPECIFICATIONS

SPEC.# TYPE WIRE FEED SPEED RANGE

LF-72 Speed Solid Cored

INSTALLATION

LF-72 Wire Feeder

Wire Size

A-1

SPEC.# TYPE

K2327-1

K2327-4

K2327-2 K2327-5

K2327-3 K2327-6 K2327-7

LF-72 11.1“ 10.2“ 12.9“ (19.7 Kg.)

Base Model

LF-72

Bench 9 AMPS ( 320 mm) (277 mm) (572 mm) (23.8 Kg.) (-10°C to 40°C) (-40°C to 85°C) Standard Duty

LF-72

Bench ( 389 mm) (330 mm) (704 mm) (30.6 Kg.) Heavy Duty

K2327-1 K2327-4 K2327-2 Bench Model 50-800 IPM .023 - 1/16 in. .035 - 5/64 in K2327-5 K2327-3 K2327-6 Bench Model K2327-7

Base Model

Standard Duty

Heavy Duty

(1.27-20.3 m/m) (0.6 - 1.6 mm) (0.9 - 2.0 mm)

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)

Height Width Depth Weight

24-42VAC 12.6“ 10.9“ 22.5“ 52.5 Lbs 14°F to 104°F -40°F to 185°F

Height Width Depth Weight

15.3“ 13.0“ 27.7“ 67.5 Lbs

PHYSICAL SIZE• TEMPERATURE RATING

43 Lbs

26.5 Lbs (12.0 Kg)

Dimensions 

WELDING CAPACITY RATING

Amp Rating Duty Cycle

500 A 60%

 Dimensions do not include wire reel.

LF-72

A-2

INSTALLATION

A-2

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.

----------------------------------------------------------------------------------------

LOCATION

The LF-72 may be placed on a bench or mounted on top of a welding power source.

Place the LF-72 in a clean and dry location.

Do not stack the LF-72.

MOUNTING

For location and size,

Mounting Holes (See Figure A.1) and for Mounting Holes (See Figure A.2).

LF-72 Bench Model Rear

FIGURE A.1

Bottom

LF-72

FIGURE A.2

A-3

INSTALLATION

A-3

BENCH MOUNT

The LF-72 mounts in a variety of configurations. As shipped from the factory, the LF-72 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

Both the standard duty bench model and heavy duty bench model 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 lift bail of the portability kit.

Swivel Kit and Bench Model, Standard Duty

Swivel Kit and Base Model LF-72

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-72

A-4

INSTALLATION

SAFETY PRECAUTION

ELECTRIC SHOCK can kill.

• Only qualified personnel should perform this installation.

• 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

100

40 & 30

40 60

100

60 60

100

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-72

A-5

Electrode

Work

Power Source

Work

Electrode

Wire Feeder

Electrode

Work

Coaxial Weld Cable

INSTALLATION

A-5

COAXIAL WELD CABLES

Coaxial welding cables are specially designed welding cables for pulse welding or STT 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 or STT wave shape. Inductance becomes more severe as the weld cables become longer.

Coaxial weld cables are recommended for all pulse and STT 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.

LF-72

A-6

POWER SOURCE WIRE FEEDER

INSTALLATION

ANALOG CONTROL CABLE

CONTROL CABLE CONNECTIONS

• All control cables can be connected end to end to extend their length.

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.

A-6

PIN FUNCTION LEAD#

A Unused ------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 Reserve for Future Use.

K 42 VAC 42 L Reserve for Future Use.

M Unused ------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-72

A-7

WIRE FEEDERPOWER SOURCE

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 amphenol pin definition shown in the table below for proper operation of the wire feeder.

Operation of Lincoln wire feeders on Miller power sources may result in lack of high speeds or reduce pull force on high wire feed speeds. Maximum wire feed speed for the LF-72 operating on a Miller power source is approximately 720ipm. 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.

A-7

MILLER POWER SOURCE

Pin Function

A 24 VAC to feeder

Pin Function

I 42 VAC feeder

LINCOLN WIRE FEEDER

D Welding Output Control B Welding Output Control C +10VDC to feeder for remote control

C Welding Output Control

E Remote Voltage Control ("+" supply, from

power source)

D Remote control common

G Remote Voltage Control ("-" supply, from

power source)

E 0-10VDC from feeder for remote control.

F Remote Voltage Control (control signal from

feeder or remote.)

F Current feedback to feeder.

J Reserved for future use. Scaled 0-10V. 1 V = 100 amps. Referenced to pin D.

G 24 VAC common. H Arc Voltage feedback to feeder.

K 42 VAC to feeder

L Reserved for future use. Scaled 0-10V. 1 V = 10 Arc volts. Referenced to pin D.

I J K L M N

Miller is a registered trademark not owned or licensed by The Lincoln Electric Company.

N Electrode voltage to power source (67)

LF-72

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