operator’s manual idealarc dc400 · 2014. 6. 5. · 3.c. in semiautomatic or automatic wire...

IDEALARC ® DC400

Operator’s Manual

Save for future reference

Date Purchased

Code: (ex: 10859)

Serial: (ex: U1060512345)

IM10107 | Issue D ate 11-Oct© Lincoln Global, Inc. All Rights Reserved.

For use with machines having Code Numbers:

11829; 11831; 11832; 11833; 11834

Register your machine: www.lincolnelectric.com/register

Authorized Service and Distributor Locator: www.lincolnelectric.com/locator

FOR ENGINEpowered equipment.

1.a. Turn the engine off before troubleshooting and maintenancework 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 beforerefueling to prevent spilled fuel from vaporiz-ing on contact with hot engine parts andigniting. Do not spill fuel when filling tank. Iffuel is spilled, wipe it up and do not startengine 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 andtools away from V-belts, gears, fans and all other movingparts when starting, operating or repairing equipment.

____________________________________________________

1.e. In some cases it may be necessary to remove safetyguards to perform required maintenance. Removeguards only when necessary and replace them when themaintenance requiring their removal is complete.Always use the greatest care when working near movingparts.

___________________________________________________1.f. Do not put your hands near the engine fan.

Do not attempt to override the governor oridler by pushing on the throttle control rodswhile the engine is running.

___________________________________________________1.g. To prevent accidentally starting gasoline engines while

turning the engine or welding generator during maintenancework, disconnect the spark plug wires, distributor cap ormagneto wire as appropriate.

iSAFETYi

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 youpurchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box351040, Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is availablefrom the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.

BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES AREPERFORMED ONLY BY QUALIFIED INDIVIDUALS.

WARNING

ELECTRIC AND MAGNETIC FIELDSmay 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, andwelders having a pacemaker should consult their physicianbefore welding.

2.c. Exposure to EMF fields in welding may have other healtheffects which are now not known.

2.d. All welders should use the following procedures in order tominimize exposure to EMF fields from the welding circuit:

2.d.1. Route the electrode and work cables together - Securethem 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 andwork 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 aspossible to the area being welded.

2.d.5. Do not work next to welding power source.

1.h. To avoid scalding, do not remove theradiator pressure cap when the engine ishot.

CALIFORNIA PROPOSITION 65 WARNINGS

Diesel engine exhaust and some of its constituentsare known to the State of California to cause can-cer, birth defects, and other reproductive harm.

The engine exhaust from this product containschemicals known to the State of California to causecancer, birth defects, or other reproductive harm.

The Above For Diesel Engines The Above For Gasoline Engines

iiSAFETYii

ARC RAYS can burn.4.a. Use a shield with the proper filter and cover

plates to protect your eyes from sparks andthe rays of the arc when welding or observingopen arc welding. Headshield and filter lensshould conform to ANSI Z87. I standards.

4.b. Use suitable clothing made from durable flame-resistantmaterial to protect your skin and that of your helpers fromthe arc rays.

4.c. Protect other nearby personnel with suitable, non-flammablescreening and/or warn them not to watch the arc nor exposethemselves to the arc rays or to hot spatter or metal.

ELECTRIC SHOCK cankill.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 bareskin 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 fullarea of physical contact with work and ground.

In addition to the normal safety precautions, if weldingmust be performed under electrically hazardousconditions (in damp locations or while wearing wetclothing; on metal structures such as floors, gratings orscaffolds; when in cramped positions such as sitting,kneeling or lying, if there is a high risk of unavoidable oraccidental contact with the workpiece or ground) usethe 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 semiautomaticwelding gun are also electrically “hot”.

3.d. Always be sure the work cable makes a good electricalconnection with the metal being welded. The connectionshould 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 andwelding machine in good, safe operating condition. Replacedamaged insulation.

3.g. Never dip the electrode in water for cooling.

3.h. Never simultaneously touch electrically “hot” parts ofelectrode holders connected to two welders because voltagebetween the two can be the total of the open circuit voltageof both welders.

3.i. When working above floor level, use a safety belt to protectyourself from a fall should you get a shock.

3.j. Also see Items 6.c. and 8.

FUMES AND GASEScan be dangerous.5.a. Welding may produce fumes and gases

hazardous to health. Avoid breathing thesefumes and gases. When welding, keepyour head out of the fume. Use enoughventilation and/or exhaust at the arc to keep

fumes and gases away from the breathing zone. Whenwelding with electrodes which require specialventilation such as stainless or hard facing (seeinstructions on container or MSDS) or on lead orcadmium plated steel and other metals or coatingswhich produce highly toxic fumes, keep exposure aslow as possible and within applicable OSHA PEL and ACGIH TLV limits using local exhaust or mechanicalventilation. In confined spaces or in some circum-stances, outdoors, a respirator may be required.Additional precautions are also required when weldingon galvanized steel.

5. b. The operation of welding fume control equipment is affectedby various factors including proper use and positioning ofthe equipment, maintenance of the equipment and the spe-cific welding procedure and application involved. Workerexposure level should be checked upon installation andperiodically thereafter to be certain it is within applicableOSHA PEL and ACGIH TLV limits.

5.c. Do not weld in locations near chlorinated hydrocarbon vaporscoming from degreasing, cleaning or spraying operations.The heat and rays of the arc can react with solvent vapors toform phosgene, a highly toxic gas, and other irritating prod-ucts.

5.d. Shielding gases used for arc welding can displace air andcause 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 thisequipment and the consumables to be used, including thematerial safety data sheet (MSDS) and follow youremployer’s safety practices. MSDS forms are available fromyour welding distributor or from the manufacturer.

5.f. Also see item 1.b.

iiiSAFETYiii

FOR ELECTRICALLYpowered equipment.

8.a. Turn off input power using the disconnectswitch at the fuse box before working onthe equipment.

8.b. Install equipment in accordance with the U.S. NationalElectrical Code, all local codes and the manufacturer’srecommendations.

8.c. Ground the equipment in accordance with the U.S. NationalElectrical Code and the manufacturer’s recommendations.

CYLINDER may explodeif damaged.7.a. Use only compressed gas cylinders

containing the correct shielding gas for theprocess used and properly operatingregulators designed for the gas and

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

7.b. Always keep cylinders in an upright position securelychained to an undercarriage or fixed support.

7.c. Cylinders should be located:• Away from areas where they may be struck or subjected tophysical damage.

• A safe distance from arc welding or cutting operations andany other source of heat, sparks, or flame.

7.d. Never allow the electrode, electrode holder or any otherelectrically “hot” parts to touch a cylinder.

7.e. Keep your head and face away from the cylinder valve outletwhen opening the cylinder valve.

7.f. Valve protection caps should always be in place and handtight except when the cylinder is in use or connected foruse.

7.g. Read and follow the instructions on compressed gascylinders, associated equipment, and CGA publication P-l,“Precautions for Safe Handling of Compressed Gases inCylinders,” available from the Compressed Gas Association1235 Jefferson Davis Highway, Arlington, VA 22202.

WELDING and CUTTINGSPARKS cancause fire or explosion.6.a. Remove fire hazards from the welding area.

If this is not possible, cover them to preventthe welding sparks from starting a fire.

Remember that welding sparks and hotmaterials from welding can easily go through small cracksand openings to adjacent areas. Avoid welding nearhydraulic 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 hazardoussituations. Refer to “Safety in Welding and Cutting” (ANSIStandard Z49.1) and the operating information for theequipment being used.

6.c. When not welding, make certain no part of the electrodecircuit is touching the work or ground. Accidental contactcan cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until theproper steps have been taken to insure that such procedureswill not cause flammable or toxic vapors from substancesinside. They can cause an explosion even though they havebeen “cleaned”. For information, purchase “RecommendedSafe Practices for the Preparation for Welding and Cutting ofContainers and Piping That Have Held HazardousSubstances”, AWS F4.1 from the American Welding Society(see address above).

6.e. Vent hollow castings or containers before heating, cutting orwelding. They may explode.

6.f. Sparks and spatter are thrown from the welding arc. Wear oilfree protective garments such as leather gloves, heavy shirt,cuffless trousers, high shoes and a cap over your hair. Wearear plugs when welding out of position or in confined places.Always wear safety glasses with side shields when in awelding area.

6.g. Connect the work cable to the work as close to the weldingarea as practical. Work cables connected to the buildingframework or other locations away from the welding areaincrease the possibility of the welding current passingthrough lifting chains, crane cables or other alternate cir-cuits. This can create fire hazards or overheat lifting chainsor cables until they fail.

6.h. Also see item 1.c.

6.I. Read and follow NFPA 51B “ Standard for Fire PreventionDuring Welding, Cutting and Other Hot Work”, availablefrom NFPA, 1 Batterymarch Park, PO box 9101, Quincy, Ma022690-9101.

6.j. Do not use a welding power source for pipe thawing.

Refer to http://www.lincolnelectric.com/safety for additional safety information.

PRÉCAUTIONS DE SÛRETÉPour votre propre protection lire et observer toutes les instructionset les précautions de sûreté specifiques qui parraissent dans cemanuel aussi bien que les précautions de sûreté générales suiv-antes:

Sûreté Pour Soudage A LʼArc1. Protegez-vous contre la secousse électrique:

a. Les circuits à lʼélectrode et à la piéce sont sous tensionquand la machine à souder est en marche. Eviter toujourstout contact entre les parties sous tension et la peau nueou les vétements mouillés. Porter des gants secs et sanstrous pour isoler les mains.

b. Faire trés attention de bien sʼisoler de la masse quand onsoude dans des endroits humides, ou sur un planchermetallique ou des grilles metalliques, principalement dans les positions assis ou couché pour lesquelles une grandepartie du corps peut être en contact avec la masse.

c. Maintenir le porte-électrode, la pince de masse, le câblede soudage et la machine à souder en bon et sûr étatdefonctionnement.

d.Ne jamais plonger le porte-électrode dans lʼeau pour lerefroidir.

e. Ne jamais toucher simultanément les parties sous tensiondes porte-électrodes connectés à deux machines à souderparce que la tension entre les deux pinces peut être letotal de la tension à vide des deux machines.

f. Si on utilise la machine à souder comme une source decourant pour soudage semi-automatique, ces precautionspour le porte-électrode sʼapplicuent aussi au pistolet desoudage.

2. Dans le cas de travail au dessus du niveau du sol, se protégercontre les chutes dans le cas ou on recoit un choc. Ne jamaisenrouler le câble-électrode autour de nʼimporte quelle partiedu corps.

3. Un coup dʼarc peut être plus sévère quʼun coup de soliel,donc:

a. Utiliser un bon masque avec un verre filtrant appropriéainsi quʼun verre blanc afin de se protéger les yeux du ray-onnement de lʼarc et des projections quand on soude ouquand on regarde lʼarc.

b. Porter des vêtements convenables afin de protéger lapeau de soudeur et des aides contre le rayonnement delʻarc.

c. Protéger lʼautre personnel travaillant à proximité ausoudage à lʼaide dʼécrans appropriés et non-inflammables.

4. Des gouttes de laitier en fusion sont émises de lʼarc desoudage. Se protéger avec des vêtements de protection libresde lʼhuile, tels que les gants en cuir, chemise épaisse, pan-talons sans revers, et chaussures montantes.

5. Toujours porter des lunettes de sécurité dans la zone desoudage. Utiliser des lunettes avec écrans lateraux dans leszones où lʼon pique le laitier.

6. Eloigner les matériaux inflammables ou les recouvrir afin deprévenir tout risque dʼincendie dû aux étincelles.

7. Quand on ne soude pas, poser la pince à une endroit isolé dela masse. Un court-circuit accidental peut provoquer unéchauffement et un risque dʼincendie.

8. Sʼassurer que la masse est connectée le plus prés possiblede la zone de travail quʼil est pratique de le faire. Si on placela masse sur la charpente de la construction ou dʼautresendroits éloignés de la zone de travail, on augmente le risquede voir passer le courant de soudage par les chaines de lev-age, câbles de grue, ou autres circuits. Cela peut provoquerdes risques dʼincendie ou dʼechauffement des chaines et descâbles jusquʼà ce quʼils se rompent.

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

10. Ne pas souder en présence de vapeurs de chlore provenantdʼopérations de dégraissage, nettoyage ou pistolage. Lachaleur ou les rayons de lʼarc peuvent réagir avec les vapeursdu 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” CSAStandard W 117.2-1974.

PRÉCAUTIONS DE SÛRETÉ POURLES MACHINES À SOUDER ÀTRANSFORMATEUR ET ÀREDRESSEUR

1. Relier à la terre le chassis du poste conformement au code delʼélectricité et aux recommendations du fabricant. Le dispositifde montage ou la piece à souder doit être branché à unebonne mise à la terre.

2. Autant que possible, Iʼinstallation et lʼentretien du poste seronteffectués par un électricien qualifié.

3. Avant de faires des travaux à lʼinterieur de poste, la debranch-er à lʼinterrupteur à la boite de fusibles.

4. Garder tous les couvercles et dispositifs de sûreté à leurplace.

ivSAFETYiv

vv

Thank You for selecting a QUALITY product by Lincoln Electric. We want youto take pride in operating this Lincoln Electric Company product••• as much pride as we have in bringing this product to you!

Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep ithandy 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:

WARNINGThis statement appears where the information must be followed exactly to avoid serious personal injury or loss of life.

This statement appears where the information must be followed to avoid minor personal injury or damage to this equipment.

CAUTION

Please Examine Carton and Equipment For Damage ImmediatelyWhen this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claimsfor material damaged in shipment must be made by the purchaser against the transportation company at thetime the shipment is received.

Please record your equipment identification information below for future reference. This information can befound 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 youhave recorded above. The code number is especially important when identifying the correct replacement parts.

CUSTOMER ASSISTANCE POLICYThe business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment, consumables, and cutting equip-ment. Our challenge is to meet the needs of our customers and to exceed their expectations. On occasion, purchasers may ask LincolnElectric for advice or information about their use of our products. We respond to our customers based on the best information in our posses-sion at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability, with respect to such infor-mation 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 orcorrecting any such information or advice once it has been given, nor does the provision of information or advice create, expand or alter anywarranty 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 controlof, and remains the sole responsibility of the customer. Many variables beyond the control of Lincoln Electric affect the results obtained inapplying 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.comfor any updated information.

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 packetaccompanying 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 “Support” and then “RegisterYour Product”. Please complete the form and submit your registration.

vivi TABLE OF CONTENTSPage

Installation .......................................................................................................Section ATechnical Specifications ........................................................................................A-1

Safety Precautions ..........................................................................................A-2Correct Operational use ..................................................................................A-2Stacking and Lifting.........................................................................................A-2Input Power Connections ................................................................................A-2Output Connections ........................................................................................A-3

Installation of Field Installed Options.....................................................................A-3K843 Amptrol Installation Instructions ...................................................................A-4Installation of Equipment Requied for Recommended Processes..........A-5 Thru A-6

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––Operational ......................................................................................................Section B

Safety Precautions.................................................................................................B-1Meaning of Graphic Symbols...................................................................B-1 thru B-3General Machine Description ................................................................................B-4Recommended Processes & Equipment ...............................................................B-4Operational Features and Control .........................................................................B-4Power Source Operation and Controls ....................................................B-5 thru B-7

Auxiliary Power Connections ..........................................................................B-8Solid State Output Control ..............................................................................B-8Case Features.................................................................................................B-8Stick Welding ..................................................................................................B-9Paralleling .......................................................................................................B-9Machine & Circuit Protection...........................................................................B-9

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

General, TIG, Stick, Wire Feeder Options.............................................................C-1––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––

Maintenance ....................................................................................................Section DSafety Precautions ................................................................................................D-1Routine Maintenance.............................................................................................D-1

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

Safety Precautions.................................................................................................E-1How to Use Troubleshooting Guide.......................................................................E-1Troubleshooting Guide.............................................................................E-2 thru E-5Procedure for Replacing P.C. Boards............................................................E-6, E-7

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––Wiring Diagrams ..............................................................................................Section F

________________________________________________________________________Parts Pages .................................................................................................P-234, P-688

A-1INSTALLATION

IDEALARC® DC-400

A-1

TECHNICAL SPECIFICATIONS – DC-400INPUT-THREE PHASE ONLY

RATED OUTPUT

HEIGHT WIDTH DEPTH WEIGHT

27.50 in. 22.25 in. 32.0 in. 473 lbs.699 mm 565 mm 988 mm 215 kg.

OUTPUT

RECOMMENDED INPUT WIRE AND FUSE SIZES FOR MAXIMUM RATED OUTPUT.IN ADDITION, FOLLOW LATEST NATIONAL ELECTRICAL CODE AND LOCAL CODE.

Duty Cycle (1) Amps Volts at Rated Amps

100% 400 3660% 450 38 50% 500 40

PHYSICAL DIMENSIONS

(1) Based upon 10 minute time period (i.e., for 60% duty cycle, it is 6 minutes on an 4 minutes off).

* Use only Bussmann Super-Lag fuses specified. Other fuses may not protect the welder and may cause overheating and possiblefire damage.

Insulation class 155(F)

220/50/60Hz230/50/60Hz380/50/60Hz400/50/60Hz415/50/60Hz440/50/60Hz

817747454341

3(25)3(25)6(16)6(16)8(10)8(10)

8(10)8(10)10(6)10(6)10(6)10(6)

100 REN-100100 REN-10060 RES-6060 RES-6060 RES-6050 RES-50

INPUTVOLTAGE /

FREQUENCY

230/60Hz460/60Hz575/60Hz

INPUT AMPERERATING ONNAMEPLATE

@100%Duty Cycle

783931

TYPE 75°CCOPPER WIRE IN

CONDUIT AWG(IEC) SIZES (mm2)

40°C(104°F)

3(25)8(10)10(6)

TYPE 75°CGROUND WIRE IN

CONDUIT AWG(IEC) SIZES (mm2)

6(16)10(6)10(6)

BUSSMANN SUPER-LAGFUSE SIZE AND

CATALOG NUMBER*

FUSE SIZE CATALOG NUMBER100 REN-10050 RES-5040 RES-40

StandardVoltage

Frequency

230/460/575V/60Hz

220/230/380/400/415/440V/50/60Hz

100% Duty Cycle

400Amps/36V78/39/31Amps

400Amps/36V81/77/47/45/43/41Amps

60% Duty Cycle

450Amps/38V83/41/33Amps

450Amps/38V85/81/49/47/45/42Amps

50% Duty Cycle

500Amps/40V84/42/34Amps

500Amps/40V86/82/50/48/46/43Amps

Input Current at Rated Output (CVI)

OUTPUT MAXIMUM OPEN CIRCUIT VOLTAGE AUXILIARY POWER

Min.----60A 12V CV(22V CC) 57V. (CC) 45.5V. (CVI) 60Hz 115 VAC, 15 AMPSMax.---500A 42V (CC, CV) 54V. (CC) 45.5V. (CVI) 50/60 Hz 42 VAC, 10 AMPS

TEMPERATURE RANGES

OPERATING TEMPERATURE RANGE-22°F to 104°F(-30°C +40°C)

STORAGE TEMPERATURE RANGE-40°F to 140°F(-40°C+60°C)

A-2INSTALLATION

IDEALARC® DC-400

A-2

SAFETY PRECAUTIONS

CORRECT OPERATIONAL USE

The machine should be located in a clean dry placewhere there is free circulation of clean air such that airmovement in through the front and out through theback will not be restricted. Dirt and dust that can bedrawn into the machine should be kept to a minimum.

Failure to observe these precautions can result inexcessive operating temperatures and nuisance shut-down of the machine.

LIMIT ON STACKING

The units may be stacked three high by observing thefollowing safety precautions:A. Make sure the first or bottom unit is setting on a

level, well supported surface.

B. The units must be stacked with their fronts flush,making sure the two holes in the base rails of theunit being stacked on top are over the two pinslocated on the top front corners of the unit it isbeing stacked on.

Input Power ConnectionsBy removing the rear access panel the three phaseinput power is connected to the three line terminals onthe input contactor, and the earth grounding lead tothe grounding terminal on the input box floor markedwith the symbol. Install and reconnect panel forthe proper input voltage per the diagram pasted insidethe access panel cover.

See Technical Specification Page:

ELECTRIC SHOCK can kill.• Do not touch electrically live parts orelectrode with skin or wet clothing.• Insulate yourself from work andground.• Always wear dry insulating gloves.

------------------------------------------------------------------------FUMES AND GASES can be danger-ous.• Keep your head out of fumes.• Use ventilation or exhaust to removefumes from breathing zone.

------------------------------------------------------------------------WELDING SPARKS can cause fire orexplosion.• Keep flammable material away.• Do not weld on closed containers.

------------------------------------------------------------------------ARC RAYS can burn eyes and skin.• Wear eye, ear and body protection.

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

See additional warning information atfront of this operatorʼs manual.

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

WARNING

FALLING EQUIPMENT can causeinjury.• Do not lift this machine using liftbale if it is equipped with a heavyaccessory such as trailer or gascylinder.

• Lift only with equipment of adequate liftingcapacity.

• Be sure machine is stable when lifting.• Do not stack more than three high.• Do not stack the DC-400 on top of any other

machine.

WARNING

A-3INSTALLATION

IDEALARC® DC-400

A-3

* Failure to follow these instructionscan cause immediate failure of com-ponents within the machine.

• When powering welder from a gener-ator be sure to turn off the welderfirst, before generator is shut down inorder to prevent damage to welder.

Output Cable ConnectionsThe output leads are connected to the output termi-nals marked “+” and “-”. They are located at the lowerright and lower left corners of the front panel. Output Cables

CABLE SIZES FOR COMBINED LENGTH OFELECTRODE AND WORK CABLE

400A(100% DUTY

CYCLE)

500A(50% DUTY

CYCLE)

MACHINE LOAD

CABLE LENGTHS

UP TO 50 ft(15m)

50 to 100 ft(15-30 m)

100-150 ft(30-46 m)

150-200 ft(46-61 m)

200-250 ft(67-76 m)

3/085 mm2

3/085 mm2

3/085 mm2

3/085 mm2

4/0107 mm2

2/067 mm2

2/067 mm2

3/085 mm2

3/085 mm2

4/0107 mm2

INSTALLATION OF FIELD INSTALLEDOPTIONS

Remote Output Control (K857 or K857-1with K864 Adapter)

An optional “remote out control” is available. TheK857 or K857-1 are the same remote control optionsthat are used on other Lincoln power sources. TheK857 or K857-1 consist of a control box with 25 feet(7.6 meters) or 100 feet (30.3 meters).

The K857 and K857-1 have a 6-pin connector andK857 require a K864 adapter cable which connects tothe 14-pin connector on the case front.

REMOTE CONTROL ADAPTER CABLE (K864)

A “V” cable 12” (.30m) long to connect a K857Remote Control (6 pin connector) with a wire-feeder(14-pin connector) and the machine (14-pin connec-tor). If a remote control is used alone the wire-feederconnection is then not used.

AMPTROL ADAPTER CABLE (843)

A five wire cable, 12” (.30m ) long, used for easyconnection of standard K963 Hand Amptrol or K870Foot amptrol. The cable has a 6-pin MS-styleconnector which connects to the Amptrol and termi-nals which connect to 75, 76, and 77 on the machineterminal strip and to the case grounding screw. theAmptrol will control the same range of output as thecurrent control on the welder. (if a smaller range ofcontrol is desired for finer adjustment, a K775 Remotemay be used in conjunction with the Amptrol AdapterCable Kit.) The Amptrol arc start switch is nonfunc-tional unless used with a K799 Hi-Frequency Kit.

See Amptrol Adapter installation Instructions on nextpage.

ELECTRIC SHOCK can kill.• Turn the power switch of the

welding power source “OFF”before installing plugs oncables or when connecting ordisconnecting plugs to weld-ing power source.

WARNING

S T R A I G H T P L U G ( 1 4 P I N )T O P O W E R S O U R C E

C A B L E R E C E P T A C L E ( 6 S O C K E T )

C A B L E R E C E P T A C L E ( 1 4 S O C K E T )

T O : 1 ) K 8 5 7 R E M O T E C O N T R O L 2 ) K 9 6 3 H A N D A M P T R O L 3 ) K 8 7 0 F O O T A M P T R O L

T O L N - 7 W I R E F E E D E R

CAUTION

A-4INSTALLATION

IDEALARC® DC-400

A-4

K84

3 A

MPT

RO

L™ A

DA

PTER

INST

ALL

ATI

ON

INST

RU

CTI

ON

S

WA

RN

ING

: TU

RN

TH

E PO

WER

SO

UR

CE

OFF

BEF

OR

E IN

STA

LLA

TIO

N

This

K84

3 ad

apte

r is

used

to c

onne

ct A

MP

TRO

L™ (K

963*

or

K87

0), r

emot

e co

ntro

l (K

775)

acc

esso

ries

to D

C-4

00 w

ith

rem

ote

cont

rol p

ower

sou

rces

.

The

pow

er s

ourc

e "m

achi

ne/re

mot

e" s

witc

h m

ust b

e in

"rem

ote"

fo

r A

mpt

rol™

to c

ontro

l cur

rent

. A

cces

sorie

s m

ay b

e co

mbi

ned

and

conn

ecte

d in

two

diffe

rent

way

s, a

s sh

own

belo

w.

AM

PTR

OL™

ON

LYA

MPT

RO

L™ P

LUS

REM

OTE

LIM

IT C

ON

TRO

L

The

Am

ptro

l™ p

rovi

des

rem

ote

curr

ent c

ontro

l thr

ough

the

full

rang

e of

the

pow

er s

ourc

e.

The

Am

ptro

l™ p

rovi

des

rem

ote

curr

ent c

ontro

l fro

m th

e m

inim

um o

fth

e po

wer

sou

rce

to a

max

imum

set

by th

e re

mot

e lim

it co

ntro

l.

PO

WE

RS

OU

RC

E

75

76

77

K963-3

or

K870 A

mptr

ol™

Pow

er s

ourc

ete

rmin

alst

rip

Bla

ck a

nd w

hite

lead

sno

t use

d. T

ape

and

insu

late

.

K84

3A

dapt

er

FIG

. 1

75

76

77

PO

WE

RS

OU

RC

E

K96

3-3

orK

870

Am

ptro

l™

K77

5 R

emot

eLi

mit

Con

trol

K84

3A

dapt

er

77

76

Bla

ck a

nd w

hite

lead

s no

t use

d.Ta

pe a

ndin

sula

te.

Bol

t and

nut

conn

ectio

n.In

sula

tean

d ta

pe.

FIG

. 2

A-5INSTALLATION

IDEALARC® DC-400

A-5

INSTALLATION OF EQUIPMENTREQUIRED FOR RECOMMENDEDPROCESSES

WIRE FEEDER CONTROL CABLE CONNECTIONS

For control cable with 14-pin connector:

Connect control cable to 14-pin connector on the frontpanel of the machine. See the appropriate connectiondiagram for the exact instructions for the wire feederbeing used. Refer to Operation Section B (AuxiliaryPower and Control Connections) for connector pinfunctions.

For control cable with terminal strip connectors:

The control cable from the wire feeding equipment isconnected to the terminal strips behind the controlpanel*. A strain relief box connector is provided foraccess into the terminal strip section. A chassisground screw is also provided below the terminal stripmarked with the symbol for connecting the auto-matic equipment grounding wire. See the appropriateconnection diagram for the exact instructions for thewire feeder being used.

A cover (Lincoln Electric Part Number S17062-3) isavailable for the unused 14-pin connector to protect itagainst dirt and moisture.

* See Terminal Strip Connections section for accessto the terminal strips.

CONNECTION OF DC-400 TO LN-22 OR LN-25

a) Turn off all power.

b) Place output terminals switch into the “ON” posi-tion.

c) Connect the electrode cable to the output terminalof polarity required by electrode. Connect the worklead to the other terminal.

d) Place the OUTPUT CONTROL Switch at “LOCAL”position unless a Remote Control is connected tothe DC-400.

e) Place MODE SWITCH in “CONSTANT VOLTAGE(FCAW, GMAW)”.

NOTE: The output terminals are energized at alltimes.

MULTIPROCESS SWITCH CONNECTION ANDOPERATION

PURPOSE

A Multiprocess Switch has been designed for use withthe DC-400. With this switch installed on the DC-400,it permits easy changing of the polarity of the wirefeed unit connected and also provides separate termi-nals for connection of stick or air carbon arc. TheMultiprocess Switch is available as either a factoryinstalled or field installed option.

NOTE: IF THE DC-400 IS TO BE USED FOR BOTHSEMIAUTOMATIC/AUTOMATIC AND STICK/AIR CARBON ARC, THEN A MULTI-PROCESS SWITCH IS REQUIRED.

DESIGN

The Multiprocess Switch consists of a 3-positionswitch assembly that is mounted in a sheet metalenclosure that has two output terminals on each endof the box. The two terminals on the left side of thebox are for connection of wire feed electrode and workleads. The two terminals on the right side of the boxare for connection of work and electrode for stick orair carbon arc. The output terminals are protectedagainst accidental contact by hinged covers.

The switch mounts to the front of the DC-400 bymeans of a bracket that fastens to the case sides.Two 4/0 (107 mm2) leads connect the switch assem-bly to each output stud.

CONNECTIONS

1. Connect wire feed unit electrode and work cablesthrough the rectangular strain relief holes in thebase of the DC-400 to the output studs on the leftside of the box.

2. Connect wire feeder control cable and make otherterminal strip connections as specified on the con-nection diagram for the Lincoln wire feeder beingused. “Electrode” and “Work” are connected to theleft side of the Multiprocess Switch.

3. Connect stick or air carbon arc electrode and workcables through the rectangular strain relief holes inthe base of the DC-400 to the output studs on theright side of the box.

A-6INSTALLATION

IDEALARC® DC-400

A-6

OPERATION

The operation of the switch is as follows:

A semiautomatic or automatic wire feed unit electrodeand work cables are connected to the terminals on theleft side of the box. Stick or air carbon arc electrodeand work leads are connected to the terminals on theright side of the box. There are three positions on theswitch. With the switch in the left position, the wirefeed terminals are electrode negative. In the centerposition, the wire feeder terminals are electrode posi-tive. In both the left and center switch position, theright side stick terminals are disconnected. In theright switch position, the wire feed terminals are dis-connected from the DC-400 and the stick terminalsconnected. The polarity of the stick terminals ismarked on the end of the box. To change polarity, theelectrode and work leads must be interchanged. Inthe stick position, the stick terminals are energized atall times.

CONNECTIONS

(For those applications where it is not necessary tohave separate work cables for stick and semiautomat-ic welding.)

If both stick and semiautomatic welding is done on thesame workpiece, only one work lead is required. Todo this, connect a 4/0 (107 mm2) jumper from thework terminal on the semiautomatic side to the termi-nal to be used for work on the stick side. The worklead from the semiautomatic side then serves as thework lead for both semiautomatic and stick welding.

To change stick polarity, reverse the leads at the (+)and (-) terminals on the right side of the MultiprocessSwitch.

NOTE: When a DC-400 equipped with MultiprocessSwitch is mounted on an undercarriage, theundercarriage handle in the resting positioncan hit the case of the Multiprocess Switch.This does no harm, but if the user desires, a1/4” or 3/8” bolt and nut may be placed in thehole in the undercarriage tow bar to limit thetravel of the undercarriage handle.

STICK, TIG OR AIR/CARBON ARC *

a) Turn off all power.

b) Disconnect all wire feed unit control, electrode, andwork leads.

c) Place MODE SWITCH in the “CONSTANT CUR-RENT (STICK/TIG)” for air carbon arc.

d) For stick, TIG or air carbon arc, place OUTPUTTERMINALS switch into the “ON” position. Withthe DC-400 connected for stick, TIG or air carbonarc welding, the output terminals will be energizedat all times.

*NOTE: If stick welding, TIG welding or air carbon arccutting is to be done on the DC-400 alongwith semi-automatic/automatic welding, thena K804-1 Multiprocess Switch is required. Ifthe Multiprocess Switch is not used, then allcontrol, electrode, and work leads to wirefeed equipment must be disconnected fromthe DC-400 before connecting the DC-400 forstick or air carbon arc cutting.

MULTIPROCESS SWITCH

WORK

ELECTRODETo semi-

auto orauto

equipment

To stickelectrodeholder orair carbonarc torch

User supplied4/0 (107 mm )jumper

2

+

B-1OPERATION

IDEALARC® DC-400

B-1

SAFETY PRECAUTIONS

When using a DC-400 power source with wire feederswhich do not have an electrical trigger interlock (orwith wire feeders with the electrical trigger interlock inthe OFF position), there will be a small spark if theelectrode contacts the work or ground within severalseconds after releasing the trigger.

When used with some wire feeders with the electricaltrigger interlock in the ON position, the arc can restartif the electrode touches the work or ground duringthese several seconds.

• Be sure to select OUTPUT TERMINALS “REMOTEON/OFF” for operation with wire feeders that haveleads numbered 2 and 4.

ELECTRIC SHOCK can kill.• Have an electrician install and ser-vice this equipment.• Turn the input power off at the fusebox before working on equipment.

• Do not touch electrically hot parts.• This next section applies to DC-400ʼs without

the Capacitor Discharge Option:

WARNING

WARNING

MEANINGS OF GRAPHIC SYMBOLS

The DC-400 nameplate has been redesigned to useinternational symbols in describing the function of thevarious components. Below are the symbols used.

POWER ON-OFF SWITCH

Input (Power)

On

Off

OUTPUT CONTROL DIAL

Output (Control)

Increase/Decrease ofOutput (Voltage orCurrent)

OUTPUT CONTROL “LOCAL-REMOTE” SWITCH

Remote Output Voltageor Current Control

Local Output Voltage orCurrent Control

CIRCUIT BREAKER

THERMAL PROTECTION LIGHT

ARC CONTROL SWITCH

Circuit Breaker

High Temperature

Gas Metal ArcWelding

Increase/Decreaseof Inductance

Low Inductance

High Inductance

B-2OPERATIONB-2

IDEALARC® DC-400

Output (Voltage)

OUTPUT TERMINALS SWITCH

On

Remote On/Off

Shielded Metal ArcWelding

ARC FORCE CONTROL DIAL

Gas Tungsten ArcWelding

Arc Force Current

Increase/Decreaseof Current

Voltmeter

VOLTMETER SWITCH

Positive Electrode

Negative Electrode

Three Phase Power

RATING PLATE

Transformer

Rectifier

Rectified DC Output

Constant VoltageCharacteristic

MODE SWITCH

Do not switch ifoutput voltageor current ispresent.

ConstantVoltage(Submerged ArcWelding)

ConstantVoltage (Fluxcored arcweldin,gasmetal arc weld-ing).

C o n s t a n tCurrent (shieldmetal arc weld-ing, gas tung-sten arc weld-ing).

EARTH GROUND CONNECTION

Signifying the Earth(Ground) Connection

B-3OPERATIONB-3

IDEALARC® DC-400

RATING PLATE (Continued)

Constant Current Characteristic

Submerged Arc Welding

Designates welder complies with National Electrical ManufacturersAssociation requirements EW 1. (Export Model only)

Designates welder complies with low voltage directive and withEMC directive. (Export Model only)

Designates welder complies with International ElectrotechnicalCommission requirements 60974-1. (European model only)

NEMA EW 1

IEC 60974-1

Three Phase Power

Transformer

Rectifier

Rectified DC Output

Constant Voltage Characteristic

Line Connection

Shielded Metal Arc Welding

Designates Welder can be used in environments withincreased hazard of electric shock. (IEC model only)

Flux Cored Arc Welding

Degree of protection provided by the enclosure IP21CE

S

B-4OPERATIONB-4

IDEALARC® DC-400

GENERAL MACHINE DESCRIPTION

The DC-400 is an SCR controlled three phase DCpower source. It is designed with a single rangepotentiometer control.

RECOMMENDED PROCESSES& EQUIPMENT

The DC-400 model is designed for all open arcprocesses including Innershield® and GMAW all solidwire and gas procedures within the capacity of themachine, plus the capability of stick and TIG weldingand air carbon arc gouging up to 5/16” (8mm) diame-ter. A mode switch selects CV (FCAW, GMAW), CVSubmerged Arc, or CC (Stick/TIG). Stick welding per-formance is similar to that of the R3R-500.

The DC-400 is designed to be used with the LN-7, LN-7 GMA, LN-8, LN-9, LN-9 GMA, LN-10, DH-10, LN-23P, LN-25, LF-72, LF-74 or LN-742 semiautomaticwire feeders, the NA-3, NA-5 and NA-5R automatics,and the LT-56 and LT-7 tractors, within the 400ampere capacity of the machine. The DC-400 DiodeKit option is required to utilize the cold start and coldelectrode sensing features of the NA-3, NA-5 and NA-5R.

OPERATIONAL FEATURES &CONTROLSARC CHARACTERISTICS

Through the unique combination of the transformer,three phase semiconverter rectifier, capacitor bank,arc control choke, and the solid state control system,outstanding arc characteristics are achieved on con-stant voltage.

In addition, an arc force control enables the DC-400 tostick weld as well as the R3R-500.

OUTPUT CONTROL

The OUTPUT control, a small 2 watt potentiometer, iscalibrated from 1 to 10. The OUTPUT control servesas a voltage control in the CV position and a currentcontrol in the CC position.

MACHINE OUTPUT CONTROL SWITCH “LOCAL”OR “REMOTE”

The machine output can be controlled by either theOUTPUT control on the machine control panel, theoutput control on the wire feed unit, or an optional“remote control” that is available. This switch selectsthe mode of control, either “LOCAL” or “REMOTE”.

OUTPUT TERMINALS “ON” OR OUTPUT TERMI-NALS “REMOTE”

This switch provides an alternative to the “2 to 4”jumpering function by energizing the machineʼs outputregardless of whether “2 or 4” is jumpered or not.

POLARITY SELECTION

Polarity selection is made by appropriately connectingthe electrode and work welding cables to either the“+“ stud or to the “-” stud. Select “VOLTMETER”switch for “+” or “-” electrode, for the remote (#21)work sensing lead.

VOLTMETER SWITCH “+” ELECTRODE OR “-”ELECTRODE

This switch selects electrode polarity for the remote(#21) work sensing lead of automatic or semiautomat-ic equipment.

115 VOLT POWER SWITCH

The power input contactor operates from an auxiliary115 volt transformer that is energized through thePOWER toggle switch on the machine control panel.“ I “ is on and “0” is off.

PILOT LIGHT

A white light on the machine control panel indicateswhen the power source input contactor is closed. Thismeans the main power transformer and all auxiliaryand control transformers are energized.


An amber light on the machine control panel indicateswhen either of the two protective thermostats haveopened. Output power will be removed but inputpower will still be applied to the machine.

INPUT CONTACTOR

The power source is equipped with an input contactor.

B-5OPERATIONB-5

IDEALARC® DC-400

POWER SOURCE OPERATION ANDCONTROLS

Duty Cycle and Time PeriodThe DC-400 is rated at the following duty cycles:

* Based upon 10 minute time period (i.e., for 60% dutycycle, it is 6 minutes on and 4 minutes off).

Overloading the DC-400 may result in opening of aninternal protective thermostat as indicated by theamber thermal protection light turning on.

STARTING THE MACHINE

The POWER toggle switch at the extreme right side ofthe control panel in the “I“ position energizes and clos-es the three phase input contactor from a 115 voltauxiliary transformer. This in turn energizes the mainpower transformer.

The machine is de-energized when the POWERswitch is in the “0” position.

The white light below the POWER switch indicateswhen the input contactor is energized.

OUTPUT CONTROL DIAL

The OUTPUT control to the right of the center of thecontrol panel is a continuous control of the machineoutput. The control may be rotated from minimum tomaximum while under load to adjust the machine out-put.

The machine is equipped with line voltage compensa-tion as a standard feature. This will hold the outputconstant except at maximum output of the machine,through a fluctuation of ±10% input line voltage.

OUTPUT CONTROL “LOCAL-REMOTE” SWITCH©

The OUTPUT CONTROL toggle switch on the controlpanel labeled “LOCAL-REMOTE” gives the operatorthe option of controlling the output at the machinecontrol panel or at a remote station. For remote con-trol, the toggle switch is set in the “REMOTE” positionand controlled at the wire feed unit control, or by con-necting a K775 control to terminals 75, 76, and 77 onthe terminal strip at the front of the machine, or byconnecting a K857 control to the 14-pin connector onthe front of the machine. For control at the machinecontrol panel, the toggle switch is set in the “LOCAL”.

(Exception: When used with an LN-9, LN-9 GMA orNA-5 wire feeder, the OUTPUT CONTROL switchmust be in the “REMOTE” position or automatic shut-down of the LN-9 or NA-5 may occur.)

POLARITY SELECTION

Polarity selection is made by appropriately connectingthe electrode and work welding cables to either the“+” stud or to the “-” stud. Select “VOLTMETER”switch for “+” or “-” electrode for the remote (#21)work sensing lead.

VOLTMETER SWITCH

Select “+” for positive electrode or “-” for negativeelectrode polarity for the remote (#21) work sensinglead of automatic or semiautomatic equipment.


The amber thermal protection light will be lit if either ofthe two protective thermostats have opened. The out-put power will be disabled but input power will still beapplied to the welder. (Refer to Machine and CircuitProtection section).

MODE SWITCH

The large MODE SWITCH on the left side of themachine, labeled “Constant Voltage (Submerged Arc),Constant Voltage (FCAW/GMAW) and ConstantCurrent (Stick/TIG)”, is used to select the properwelder characteristics for the process being used.

The CV (FCAW/GMAW) Mode permits the DC-400 toproduce essentially a flat output characteristic that canbe varied from approx. 12 to 42 volts.

DUTY CYCLE * AMPS VOLTS

100%60%50%

400450500

363840

ELECTRIC SHOCK can kill.• Have an electrician install and ser-

vice this equipment.• Turn the input power off at the fuse

box before working on equipment.• Do not touch electrically hot parts.

WARNING

B-6OPERATIONB-6

IDEALARC® DC-400

In this position, the dynamic characteristics of themachine under welding conditions provide optimumwelding characteristics for Innershield® welding, otheropen arc processes including short arc MIG welding,and air carbon arc. Most submerged arc welding canalso be done in this mode.

The CV (Submerged Arc) Mode also produces anessentially flat output characteristic that can be variedfrom approximately 12 to 42 volts. The dynamiccharacteristics of the CV Submerged Arc Mode makepossible improved submerged arc welding over thatpossible using the Constant Voltage InnershieldMode. The improvement is most noticeable on highdeposition, slow travel speed welds.

There are no means provided to switch between anyof the modes remotely. Do not change the position ofthe MODE SWITCH if output voltage or current is pre-sent as this may damage the switch.

The CC Mode permits the DC-400 to produce a con-stant current output characteristic through the range of60-500 amps with an open circuit voltage of approxi-mately 57 volts (54V on 50/60 Hz). Stick welding andTIG are done with this position of the Mode Switch.

ARC FORCE CONTROL DIAL (Effective only in CCmode)

The ARC FORCE control is calibrated from one to ten.For most welding, the dial should be set at approxi-mately midrange, 5-6. Adjustments up or down canthen be made depending on the electrode, proce-dures, and operator preference. Lower settings willprovide less short circuit current and a softer arc. Asetting that is too low may cause the electrode to stickin the puddle. Higher settings will provide a highershort circuit current and a more forceful arc.Excessive spatter may result if the control setting istoo high. For most TIG welding applications adjustthis control to a minimum for best operating character-istics.

ARC CONTROL SWITCH (Effective only in CVFCAW/GMAW mode)

The ARC CONTROL is a tapped switch numberedfrom 1 to 5 and changes the pinch effect of the arc.This control is most useful in processes that utilize a“shorting” metal transfer and controls the spatter, fluid-ity, and bead shape. The pinch effect is increased byturning the control clockwise.

For all applications, a good starting point for the ARCCONTROL is a midrange dial setting of 3. The controlcan be increased or decreased as desired.

OUTPUT TERMINALS SWITCH

The OUTPUT TERMINALS toggle switch on the con-trol panel labeled “REMOTE - ON” allows the welderoutput to be activated remotely or to be always on.For remote operation, the toggle switch is set in“REMOTE” position and the welder output will be acti-vated when 2 and 4 are closed when using a wire-feeder. For welder output to always be activated, setthe switch to the “ON” position.

110-115V AC and 40-42V AC AuxiliaryPower and Control Connections

14-PIN CONNECTOR

The 14-pin connector receptacle supplies auxiliarypower.

40-42V AC is available at receptacle pins I and K. A10 amp circuit breaker protects this circuit.

On the Domestic and Export models 110-115V AC isavailable at receptacle pins A and J. A 10 amp circuitbreaker protects this circuit. Note that the 40-42V ACand 110-115V AC circuits are electrically isolated fromeach other.

FRONT VIEW OF 14-PIN CONNECTOR RECEPTACLE

PIN LEAD NO. FUNCTION

ABCDEFGHIJKLMN

32GND

24

77767521413142---------

110 - 115V AC (Domestic & Export)CHASSIS CONNECTIONTRIGGER CIRCUITTRIGGER CIRCUITOUTPUT CONTROLOUTPUT CONTROLOUTPUT CONTROLWORK CONNECTION40-42V AC110-115V AC (Domestic & Export)40-42V AC---------

F = 7 6

G = 7 5

H = 2 1

N = S P A R E

I = 4 1

J = 3 1K = 4 2

A = 3 2

B = G N D

C = 2

D = 4

E = 7 7

L = S P A R E

M = S P A R E

B-7OPERATIONB-7

IDEALARC® DC-400

Terminal Strip Connections

Terminal strip TS2 located behind the hinged controlpanel on the front of the power source supplies110-115V AC. A 10 amp circuit breaker protects thiscircuit. Note that this 110-115V AC is also available inthe 14-pin connector on the Domestic and Exportmodels.

To gain access to the terminal strips simply removethe six #10 sheet metal screws from the perimeter ofthe welder nameplate as shown below. Tilt panel for-ward so it rests in a horizontal position. See Tableshowing Front View of 14-Pin Connector Receptaclefor lead number functions.

230V AC Auxiliary Power for Water Cooler(European and Export models)

A Continental European receptacle is located on therear panel for supplying 230V AC to a water cooler. A3.5 amps circuit breaker which is also located on therear panel protects this circuit from excessive over-loads or short circuits.

Machine and Circuit Protection

The power source is thermostatically protected withproximity thermostats against overload or insufficientcooling. One thermostat is located on the nose of thecenter bottom primary coil and a second thermostat isattached to the lead connection the secondaries.Both thermostats are connected in series with 2-4 cir-cuit. If the machine is overloaded, the primary ther-mostat will open, the output will be zero, and theamber thermal protection light will be on.

The fan will continue to run. The secondary thermo-stat will open either with an excessive overload orinsufficient cooling. The output will be zero and theamber protection light will be off.

345

6

21

B-8OPERATIONB-8

IDEALARC® DC-400

AUXILIARY POWER CONNECTIONS

The power source is equipped to furnish nominally110-115 volt AC and 40-42 volt AC auxiliary power foroperating wire feeding equipment, etc. The auxiliarypower is available at the 14-pin MS-style connectorreceptacle on the control panel and/or at a terminalstrip behind the hinged control panel on the front ofthe power source. 110-115V AC is available at recep-tacle pins A and J (Domestic and Export models only),and terminals 31 and 32 (all models). 40-42V AC isavailable only at receptacle pins I and K. The 110-115V AC and the 40-42V AC are isolated circuits andeach is protected by a 10 amp circuit breaker.

REMOTE CONTROL CONNECTIONS

Remote control connections are available both at a14-pin connector receptacle located on the controlpanel, and on terminal strips with screw connectionslocated behind the hinged control panel on the front ofthe power source.

OUTPUT CONNECTIONS

The output terminals are recessed on the case frontand labeled “+” and “-”.

INPUT CONNECTIONS

The three input lines are brought in through the rearpanel of the power source and attached to the inputcontactor. Removal of the removable access panelmakes the contactor accessible for the input cableconnections.

INPUT LINE VOLTAGE COMPENSATION

The power source is equipped with input line voltagecompensation as standard. For a line voltage fluctua-tion of ±10% the output will remain essentially con-stant. This is accomplished through the feedback net-work in the control circuit.

SOLID STATE OUTPUT CONTROL

The output of the welder is electronically controlled bySCRʼs instead of mechanical contactors, providingextra long life for highly repetitive welding applica-tions.

SOLID STATE CONTROL SYSTEM

The control circuitry consists of six basic circuits: (1)the SCR snubber network, (2) the SCR firing circuit,(3) the control/fault protection circuit, (4) the startingcircuit, (5) the power-up delay circuit, and (6) thepower circuit.

The SCR snubber board consists of a capacitor andresistor connected across each SCR and across theentire bridge and MOVʼs to protect the control circuitryand SCRʼs from transient voltages. The snubberboard is mounted on the back of the case front.

The SCR firing circuit, the control fault protection cir-cuit, the power-up delay circuit, and the power circuitare mounted on the control PC board located behindthe front control panel. (The front control panel hingesdown for easy access to the board.)The starting circuit board is located on the back of thecontrol box.

MACHINE COOLING

The fan pulls air in through the louvered front of themachine over the internal parts and exhausts out thelouvered rear of the machine. The fan motor is fullyenclosed, has sealed ball bearings, requires no lubri-cation, and operates when the power switch is turnedon.

CASE FEATURES

The machine uses a 32” (813mm) long base. The lowprofile case facilitates installation of the machineunder a workbench and stacking the machines threehigh to conserve floor space.

The case front incorporates a recessed control panelwhere all the machine controls are mounted. Thisrecessed panel protects the controls and minimizesthe possibilities of accidental contact. This controlpanel can be easily opened to permit access to theenclosed control section which contains the terminalstrips, PC board, etc.

The output lead terminals are also recessed to avoidany object or person accidentally coming in contactwith an output terminal. Strain relief is provided byholes in the front of the base. The leads are routed upthrough these holes to the output terminals. This pre-vents any damage of the output studs or insulation ofsame in the event the cables are pulled excessively.An output stud cover protects against accidental con-tact with the output studs. Cover hinges upward foraccess to the studs.

The individual case sides are removable for easyaccess for internal service or inspection. These areremovable even though the machines are stackedthree high.

B-9OPERATIONB-9

IDEALARC® DC-400

The case rear, top section, is equipped with a remov-able access panel. This provides easy access to theinput contactor, easy connection and reconnection ofinput leads, and easy access for service or inspection.

The total construction of the machine permits outdooroperation. The enclosure is designed with air intakelouvers that keep dripping water from being drawn intothe unit. The transformer, SCR bridge assembly, andchoke are double-dipped in a special corrosion resis-tant coating.

A permanent lifting hook is located at the top of themachine and is positioned so that it acts as nearly aspossible through the center of gravity. This lift hook isso positioned that it fits without interference under thebase of the second machine when stacking.

ARC FORCE SELECTOR(Effective only on CC for Stick and TIG Processes)

An ARC FORCE selector is provided similar to thatused on the R3R. This control allows the user toselect the ideal arc force for the procedure and elec-trode being used.

ARC CONTROL(Effective Only When Using CVI Mode)

The ARC CONTROL is a five-position switch thatchanges the pinch effect of the arc. This results in thecontrol of spatter, fluidity, and bead shape. The ARCCONTROL is set to provide optimum welding depend-ing on the process being used, position, electrode,etc. The pinch effect is increased by turning the con-trol clockwise and may be adjusted while the machineis in operation.

MODE SWITCH

A MODE SWITCH selects between Constant Voltage(FCAW/GMAW), Constant Voltage (Submerged Arc),and Constant Current (Stick/TIG).

STICK WELDING

When the DC-400 is used for stick welding or air car-bon arc, the control leads and welding cables to anysemiautomatic or automatic wire feeders must be dis-connected from the DC-400 for maximum safety(unless the Multiprocess switch option is installed).

PARALLELING

There are no provisions on the DC-400 to permit par-alleling.

DIODE OPTION

The DC-400 Diode option is required to utilize the coldstart and cold electrode sensing features of the NA-3,NA-5 or NA-5R. When this option is not used with anNA-3, NA-5 or NA-5R, see the DC-400/NA-3, DC-400/NA-5 or DC-400/NA-5R connection diagram forinstructions on how to disable this circuit. If the circuitis not disabled, the wire cannot be inched down.

Machine & Circuit Protection(Thermal Protection Light)

The power source is thermostatically protected withproximity thermostats against overload or insufficientcooling. One thermostat is located on the nose of thecenter bottom primary coil and a second thermostat isattached to the lead connecting the secondaries.Both thermostats are connected in a series with the 2-4 circuit. If the machine is overloaded, the primarythermostat will be open, the output will be zero, andthe amber thermal protection light will be on. The fanwill continue to run. The secondary thermostat willopen either with an excessive overload or insufficientcooling. The output will be zero and the amber pro-tection light will be on. When the thermostats resetthe protection light will be off.

The power source is also protected against overloadson the SCR bridge assembly through an electronicprotection circuit. This circuit senses an overload onthe power source and limits the output to 550 amps byphasing back the SCRʼs.

Protection is provided to protect the circuitry fromaccidental grounds. If the customer accidentally“grounds” 75, 76, or 77 to the positive output lead, theDC-400 will be reduced to a low value, thus prevent-ing any damage to the machine. If the ground occursbetween 75, 76, 77 and the negative output lead, oneof the PC board “self-restoring” fuses will blow, pre-venting any machine damage.

C-1ACCESSORIESC-1

GENERAL

K2149-1 - Work Lead Package

K804-1 - Multi-Process Switch

K841 - Undercarriage

K843 - Amptrol Adaptor Kit

TIG OPTIONS

K1798 - Terminal Strip Adapter Cable

K586-1 - Deluxe Adjustable Gas Regulator and HoseKit

K775 - Remote Limit Switch

K828-1 - Capacitor Discharge Circuit

K864 - Remote Control A

K870 - Foot Amptrol™

K930 - 2 - TIG Module

K936 - 1 Control Cable - 9 to 14

K937 - 45 - TIG Module Control Cable Extension

K939 - 1 Docking Kit

K963 - 3 - Hand Amptrol™

STICK

K857 - Remote Output Control - 25 ft. (7.6 m)

K857-1 - Remote Output Control - 100 ft. (30.5 m)

K864 - Remote Control Adapter

K704 - Accessory Kit - 400 Amp

WIRE FEEDER

K2327-4 - LF-72 Wire Feeder, Base Model (No Gun)

K2327-5 - LF-72 Wire Feeder, Bench Model,Standard Duty

K2327-6 - LF-72 Wire Feeder, Bench Model, HeavyDuty

K2327-7 - LF-72 Wire Feeder, Bench Model, HeavyDuty (No Gun)

IDEALARC® DC-400

D-1MAINTENANCED-1

IDEALARC® DC-400

SAFETY PRECAUTIONS

-----------------------------------------------------------------------ELECTRIC SHOCK can kill.• Have an electrician install and ser-


box before working on equipment.• Do not touch electrically live parts or electrode

with skin or wet clothing.• Insulate yourself from work and ground• Always wear dry insulating gloves.------------------------------------------------------------------------

See additional warning informationthroughout this operatorʼs manual andthe Engine manual as well.

-----------------------------------------------------------ROUTINE MAINTENANCE

1. The fan motor has sealed bearings which requireno service.

2. In extremely dusty locations, dirt may clog the airchannels causing the welder to run hot. Blow outthe machine at regular intervals.

3. In extremely dusty locations, dirt may accumulateon the remote control terminal strip TS1. Wipe orblow this terminal strip off at regular intervals. Thisis particularly important in damp locations.

WARNING

E-1TROUBLESHOOTINGE-1

IDEALARC® DC-400

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact yourLocal Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

CAUTION

This Troubleshooting Guide is provided to help youlocate and repair possible machine malfunctions.Simply follow the three-step procedure listed below.

Step 1. LOCATE PROBLEM (SYMPTOM).Look under the column labeled “PROBLEM (SYMP-TOMS)”. This column describes possible symptomsthat the machine may exhibit. Find the listing thatbest describes the symptom that the machine isexhibiting.

Step 2. POSSIBLE CAUSE.The second column labeled “POSSIBLE CAUSE” liststhe obvious external possibilities that may contributeto the machine symptom.

Step 3. RECOMMENDED COURSE OF ACTIONThis column provides a course of action for thePossible Cause, generally it states to contact yourlocal Lincoln Authorized Field Service Facility.

If you do not understand or are unable to perform theRecommended Course of Action safely, contact yourlocal Lincoln Authorized Field Service Facility.

HOW TO USE TROUBLESHOOTING GUIDE

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 andmachine operator and will invalidate your factory warranty. For your safety and to avoid ElectricalShock, please observe all safety notes and precautions detailed throughout this manual.

__________________________________________________________________________

WARNING

ELECTRIC SHOCK can kill.• Have an electrician install and servicethis equipment.• Turn the input power off at the fusebox before working on equipment.

• Do not touch electrically hot parts.---------------------------------------------------------------------

WARNING


IDEALARC® DC-400

Observe all Safety Guidelines detailed throughout this manual


CAUTION

PROBLEMS(SYMPTOMS)

POSSIBLE CAUSE

RECOMMENDEDCOURSE OF ACTION

Input contactor (CR1) chatters.

Machine input contactor does notoperate.

Machine input contactor operates,but no output when trying to weld.

Machine has minimum output and nocontrol.

1. Faulty input contactor (CR1).

2. Low line voltage.

1. Supply line fuse blown.

2. Contactor power circuit dead.

3. Broken power lead.

4. Wrong input voltage.

5. Open input contactor coil.

6. POWER “I/0” switch (S1) notclosing.

1. Trigger circuit between #2 and #4leads is not being closed.

2. Electrode or work lead loose orbroken.

3. Open main transformer (T1) pri-mary or secondary circuit.

4. Defective Control PC Board.

5. Primary or secondary thermostatsopen.

1. Terminals 75, 76 or 77 groundedto positive output.

1. Repair or Replace.

2. Check input power.

1. Replace if blown - look for reasonfirst.

2. Check control transformer T2 andassociated leads.

3. Check input voltage at contactor.

4. Check voltage against instruc-tions.

5. Replace coil.

6. Replace switch.

1. Make sure trigger circuit is beingclosed.

2. Repair Connection.

3. Repair.

4. Replace. See Procedure forReplacing PC Boards.

5. Amber thermal protection light ison: Check for overheating; makesure fan is operating and there isno obstruction to free air flow.

1. Check 75, 76, or 77 for ground topositive output circuit. Nearlyzero ohms to ground indicates agrounded circuit. A value greaterthan a few thousand ohms is nor-mal. Self-restraining fuses on PCBoard automatically reset within afew seconds after ground iscleared.


IDEALARC® DC-400



CAUTION

PROBLEMS(SYMPTOMS)

POSSIBLE CAUSE


Machine has high output or pulsingoutput and no control.

Machine has low output and nocontrol.

Machine does not have maximumoutput.

Machine will not shut off.

1. Terminals 75, 76, or 77 groundedto negative output.

1. OUTPUT CONTROL “LOCAL-REMOTE” switch (S2) in wrongposition.

2. OUTPUT CONTROL switchfaulty.

3. Open in feedback circuitry.

4. Faulty Control PC Board.

5. OUTPUT control potentiometercircuit open (lead 75).

1. One input fuse blows.

2. One phase of main transformeropen.


4. OUTPUT control potentiometer.

5. OUTPUT control potentiometerleads 210, 211 or 75 open.

1. Input contactor contacts frozen.

2. Defective POWER “1/0” switch,(S1).

1. Check 75, 76, or 77 for ground tonegative output circuit. Nearlyzero ohms to ground indicates agrounded circuit. A value greaterthan a few thousand ohms is nor-mal. Self-restoring fuses on PCBoard automatically reset within afew seconds after ground iscleared.

1. Check position of switch.

2. Check switch & replace if faulty.

3. Check wiring and control PCBoard wiring harness plugs.


5. Check and replace potentiometerif faulty. Check wiring of lead#75.

1. Check and replace if blown afterchecking for reason for blownfuse.

2. Check for open and repair.


4. Check and Replace if faulty.

5. Check and repair broken leads.

1. Check and replace if necessary.

2. Replace.


IDEALARC® DC-400



CAUTION

PROBLEMS(SYMPTOMS)

POSSIBLE CAUSE


Variable or sluggish welding arc.

OUTPUT control not functioning onthe machine.

OUTPUT control not functioning on“REMOTE” control.

1. Poor work or electrode connec-tion.

2. Welding leads too small.

3. Welding current or voltage toolow.

4. Defective main SCR bridge.

5. Microswitch S4C or S4D actuatordefective.

1. OUTPUT CONTROL switch inwrong position.

2. Faulty OUTPUT control switch.

3. Faulty OUTPUT control poten-tiometer.

4. Leads or connections open incontrol circuit.


1. OUTPUT CONTROL switch inwrong position.

2. Faulty OUTPUT CONTROLswitch.

3. Faulty remote control potentiome-ter.

4. Leads or connections open incontrol circuit.


1. Check and clean all connections.

2. Check table in instruction manual.

3. Check procedures for recom-mended settings.

4. Check and replace if defective.

5. Check and replace if defective.(If S4C or S4D actuator is founddefective, replace mode switchcam also.)

1. Place switch in “LOCAL”.

2. Check and replace if found faulty.


4. Check lead continuity and con-nections for an open and repair ifnecessary.


1. Place switch in “REMOTE”.



4. Check all leads and connections,internal or remote, for continuity.Repair if necessary.



IDEALARC® DC-400



CAUTION

PROBLEMS(SYMPTOMS)

POSSIBLE CAUSE


Poor arc striking with semiautomaticor automatic wire feeders.

Poor arc characteristics.

ARC CONTROL has no effect in CV(FCAW/GMAW) mode with short cir-cuit transfer processes.

115VAC Receptacle not working.

1. Defective start circuit.

2. Poor work connection.

3. Improper procedures.


1. Start circuit energized at all times(read switch CR3 not closing).

2. Defective Start PC Board.


4. Capacitor(s) in output circuitfailed. A failure is indicated if thesmall vent plug on top of a capac-itor is raised or blown out.

1. Defective R1, L1, S4C, S4D actu-ator or S5.

1. Circuit Breaker Tripped.2. Defective Circuit Breaker.3. Broken connection in wiring.

1. Check Start PC Board and reedswitch CR3.

2. Work connection must be ade-quate for application.

3. Adjust procedures for improvedstarting.


1. Short reed switch CR3 leadstogether. If welding improves,replace reed switch.

2. If problem is still present withreed switch shorted, unplug StartPC Board. If problem disap-pears, replace Start PC Board.


4. Replace entire bank of capaci-tors. Do not replace individualcapacitors.

WARNING: The liquid electrolyte in thesecapacitors is toxic. Avoid contactwith any portion of your body.Clean up vented electrolyte usingrubber gloves and a waterdamped cloth. Any electrolytewhich gets on skin, clean withsoap and water.

1. Check and replace if found defec-tive. (If S4C or S4D actuator isfound defective, replace modeswitch cam also.)

1. Reset circuit breaker. Make sureload on does not exceed 15A rat-ing of circuit breaker.

2. Replace3. Check all wiring going to recepta-

cle and circuit breaker for possiblebroken connection.


IDEALARC® DC-400


CAUTION

PROCEDURE FOR REPLACING PC BOARDS

When a PC Board is suspected to be defective, the follow-ing procedure must be followed:

1. Visually inspect the PC Board. If the board has fuses,check to see if any are blown. Are any of the compo-nents damaged? Is a conductor on the back side of theboard damaged? If electrical damage is visible on thePC Board, inspect the machine wiring for grounds orshorts to avoid damaging a new PC Board, Install a newPC Board only after a visual inspection of the PC Boardand machine wiring is satisfactory.

2. If the problem is remedied by a new PC Board, install theold PC Board and see if the problem still exists. If theproblem does not return with the old board:a) Check the PC Board harness plug and PC Board plug

for contamination, corrosion or oversize.b) Check leads in the harness for loose connections.

CONNECTING THE REMOTE CONTROL TO THEMACHINE

Extreme caution must be observed when installing orextending the wiring of a remote control. Improper connec-tion of this unit can lead to failure of the output control rheo-stat or the control circuit. Only the green lead can andshould be grounded to the machine case. When extendingthe standard remote control, make sure the leads are thesame and the splice is waterproof. Be very careful not toground the cable when in use and donʼt let the lugs touchagainst the case.

OUTPUT VOLTAGE

The output circuit voltage of the machine should beadjustable from 10 to 46 volts in CV. In the CC mode, theopen circuit voltage should be approximately 57 volts (54volts on 50/60 Hz) except at near minimum settings of theoutput control where it may be lower. If any other conditionexists, refer to the Troubleshooting Guide.

FAULT PROTECTION OPERATION

The overload protection circuit, in the Control PC Board willlimit the welding current (heat) to 550 amps if a short oroverload is applied to the machine. (Refer to the Machineand Circuit Protection section).

CHECKING SNUBBER CIRCUIT

In case of an SCR malfunction or failure the snubberassembly should be checked. Turn the machine off andremove the sides of the machine. (See the instruction man-ual parts list for the exact location.)

1. Visually inspect the snubber assembly for overheatedcomponents or damaged components.

CHECKING OUTPUT CONTROL RHEOSTAT ONMACHINE

Turn machine off (“0” position).

Remove the control panel screws and open the controlpanel (see the section on Terminal Strip Connections forscrew locations).

Turn the OUTPUT CONTROL switch to “REMOTE”.

Disconnect the harness plug from the Control PC Board.

With an ohmmeter on X1K, connect it to lead 210 and 75 onR4.

Exercise caution to avoid damaging POT taps.

POWER “I/0” SWITCH CHECK

1. Turn off the machine power input (“0” position). S1 has115V across it when the input power is connected.

2. Isolate the switch to be tested by removing all connectingleads.

3. Check to make sure the switch is making connectionswith an ohmmeter. The meter should read zero resis-tance.

4. Put the ohmmeter on X1K scale and measure the resis-tance between the terminal and the case of the machine(touch a self-tapping screw). Reading should be infinite.

5. If either step (3) or step (4) fails, replace the switch.

ELECTRIC SHOCK can kill.• Have an electrician install and ser-


box before working on equipment.• Do not touch electrically hot parts.----------------------------------------------------------------------

WARNING


IDEALARC® DC-400


CAUTION

REMOTE CONTROL CHECK

Disconnect the remote output control and connect anohmmeter across 75 to 76 and rotate the rheostat inthe remote control. The resistance reading should gofrom zero to 10K ohms. Repeat with ohmmeteracross 75 and 76 with same results. Connect ohm-meter across 75 and 77. The reading should be 10Kohms. A lower reading will indicate a shorted or par-tially shorted rheostat. A very high reading will indi-cate an open rheostat. In either of the last two cases,replace rheostat. Check cable for any physical dam-age.

POWER RECTIFIER BRIDGE ASSEMBLYCHECKING PROCEDURE

1. Bridge and Device Isolation (See the instruc-tion manual parts list for the exact location.)

Disconnect the following leads from the bridge,shown in Diagram 1:

a) Unplug P3 (G1, G2, G3 and 204) from theControl PC Board.

b) Unplug P5 from the Snubber PC Board.

c) Secondary leads X1, X2, and X3 from theanodes of the SCRʼs and cathodes of thediodes.

d) Disconnect positive bridge lead from shunt andpositive capacitor bank lead and from lug withtriple 204 leads.

e) Perform the following steps 2 and 3. If diodesand SCRʼs are not shorted, bridge test is com-pleted. If any device appears shorted, discon-nect the cathode lead of each diode (4 total)and repeat Steps 2 and 3.

2. Power Diode Test

a) Establish the polarity of the ohmmeter leadsand set to X10 scale.

b) Connect the ohmmeter positive lead to anodeand negative lead to cathode.

c) Reverse the leads of the ohmmeter fromStep b.

d) A shorted diode will indicate zero or an equallylow resistance in both directions. An opendiode will have an infinite or high resistance inboth directions and a good diode will have alow resistance in Step b and Step a much high-er resistance in Step c.

3. Power Silicon Controlled Rectifier Test

a) Connect the ohmmeter (set to m X10 scale)leads to the anode and cathode.

b) Reverse the leads of the ohmmeter from Stepa.

c) A shorted SCR will indicate zero or an equallylow resistance in one or both directions.

d) Establish the polarity of the ohmmeter.Connect the positive lead to the gate and thenegative lead to the cathode.

e) An open gate circuit will have an infinite or highresistance. A good gate circui

operator’s manual idealarc dc400 · 2014. 6. 5. · 3.c. in semiautomatic or automatic wire...

Documents