INVERTEC S T T II · special precautions should be used to prevent hazardous situations. Refer to “Safety in Welding and Cutting” (ANSI Standard Z49.1) and the operating information

INVERTEC ® S T T ® II

OPERATOR’S MANUAL

IM582-AMarch, 2005

Safety Depends on YouLincoln arc welding and cuttingequipment is designed and builtwith safety in mind. However,your overall safety can beincreased by proper installation... and thoughtful operation onyour part. DO NOT INSTALL,OPERATE OR REPAIR THISEQUIPMENT WITHOUT READ-ING THIS MANUAL AND THESAFETY PRECAUTIONS CON-TAINED THROUGHOUT. And,most importantly, think beforeyou act and be careful.

For use with machines having Code Numbers: 10381, 10382, 10383,11090, 11091, 11092, 11115 and 11116

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

• World's Leader in Welding and Cutting Products •

Copyright © 2005 Lincoln Global Inc.

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

Mar ‘95

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 below Threshold Limit Values (TLV)using local exhaust or mechanical ventilation. Inconfined spaces or in some circumstances, outdoors, arespirator may be required. Additional precautions arealso required when welding on galvanized steel.

5.b. 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.c. 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.d. 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.e. Also see item 1.b.

Mar ‘95

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.

iiiSAFETYiii

Mar ‘95

WELDING SPARKS 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 hot

materials 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.

ivSAFETYiv

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 L’Arc1. Protegez-vous contre la secousse électrique:

a. Les circuits à l’électrode 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 s’isoler 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 l’eau 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 s’applicuent 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 n’importe quelle partiedu corps.

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

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

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

c. Protéger l’autre personnel travaillant à proximité ausoudage à l’aide d’écrans appropriés et non-inflammables.

4. Des gouttes de laitier en fusion sont émises de l’arc desoudage. Se protéger avec des vêtements de protection libresde l’huile, 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 l’on pique le laitier.

6. Eloigner les matériaux inflammables ou les recouvrir afin deprévenir tout risque d’incendie 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 d’incendie.

8. S’assurer que la masse est connectée le plus prés possiblede la zone de travail qu’il est pratique de le faire. Si on placela masse sur la charpente de la construction ou d’autresendroits 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 d’incendie ou d’echauffement des chaines et descâbles 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 tôlesgalvanisées plombées, ou cadmiées ou tout autre métal quiproduit des fumeés toxiques.

10. Ne pas souder en présence de vapeurs de chlore provenantd’opérations de dégraissage, nettoyage ou pistolage. Lachaleur ou les rayons de l’arc 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 del’électricité 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, I’installation et l’entretien du poste seronteffectués par un électricien qualifié.

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

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

Mar. ‘93

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 orloss of life.

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

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 “Quick Links” and then“Product Registration”. Please complete the form and submit your registration.

vi vi TABLE OF CONTENTS

Page

Safety .....................................................................................................................i-iv

Installation ......................................................................................................Section A Technical Specifications.....................................................................................A-1,A-2Location ....................................................................................................................A-3Stacking ....................................................................................................................A-3Tilting .....................................................................................................................A-3Machine Grounding and High Frequency Interference Protection............................A-3Input Connections .....................................................................................................A-3

Supply Connections ...........................................................................................A-3Input Cable Installation and Connection.............................................................A-4Ground Connection ............................................................................................A-4

Input Voltage Reconnect Procedure .........................................................................A-5Output Connections ..................................................................................................A-5

Wire Feeder Output Connections.......................................................................A-5

Operation ........................................................................................................Section BSafety Precautions....................................................................................................B-1General Description ..................................................................................................B-2Recommended Equipment .......................................................................................B-2Operating Controls....................................................................................................B-2Design Features and Advantages.............................................................................B-2Welding Capability ....................................................................................................B-2Limitations.................................................................................................................B-2Operational Features and Controls...........................................................................B-3Welding Operation ....................................................................................................B-4Welding Parameters and Guidelines ........................................................................B-5Welding Procedures for (Steel) Horizontal Fillet .......................................................B-5Welding Procedures for (Stainless Steel) Horizontal Fillet .......................................B-6

Accessories ....................................................................................................Section COptions/Accessories .................................................................................................C-1LN-742 or STT-10 Wire Feeder Connection Instructions .........................................C-1

Maintenance....................................................................................................Section DSafety Precautions .................................................................................................D-1Input Filter Capacitor Discharge Procedure ...........................................................D-1Preventive Maintenance.........................................................................................D-2

Troubleshooting .............................................................................................Section EHow To Use Troubleshooting Guide ......................................................................E-1Troubleshooting Guide ..................................................................................E-2 - E-6

Diagrams .........................................................................................................Section FWiring Diagram............................................................................................F-1 thru F-3Dimension Print.........................................................................................................F-4

Parts List .....................................................................................................P294 Series

INVERTEC STT II

A-1INSTALLATION A-1

STANDARD VOLTAGE INPUT CURRENT AT RATED OUTPUT

208/230/460/3/60 HZ 32/30/16

200/220/380/415/440/3/50/60 HZ 33/30/18/17/16

TECHNICAL SPECIFICATIONS –Invertec STT II (For Codes 11092 and BELOW)INPUT- THREE PHASE ONLY

RATED OUTPUT

RECOMMENDED INPUT WIRE AND FUSE SIZESINPUT VOLTAGE FUSE(SUPER LAG) INPUT AMPERE TYPE 75°C TYPE 75°CAND FREQUENCY OR BREAKER RATING ON COPPER COPPER

SIZE NAMEPLATE SUPPLY WIRE GROUND WIREIN CONDUIT IN CONDUITAWG (IEC) SIZES AWG (IEC) SIZES

208/60 40 32230/60 40 30460/60 30 16200/50/60 40 33

220/50/60 40 30 10 (6 mm2) 10 (6 mm2)380/50/60 30 18415/50/60 30 17440/50/60 30 16

HEIGHT WIDTH DEPTH WEIGHT

23.2 in 13.2 in. 24.4 in. 100 lbs.

589 mm 336 mm 620 mm 46 kg

OUTPUT

DUTY CYCLE AMPS VOLTS AT RATED AMPS

60% Duty Cycle 225 29


CURRENT RANGE OPEN CIRCUIT VOLTAGE AUXILIARY POWER

Peak Current 1 0 - 450 Amps 85 VDC Maximum 115 2 VAC @ 4 AmpsBackground 0 - 125 Amps 42 VAC @ 4 Amps

1 At low input voltages (below 208 VAC) and input voltages of 380 VAC through 415 VAC there may be a 15% reduction in Peak Current.

2 115 VAC not present on European Models.

PHYSICAL DIMENSIONS

A-2INSTALLATION A-2

INVERTEC STT II

STANDARD VOLTAGE INPUT CURRENT AT RATED OUTPUT

200/208/3/50/60 HZ 36/34

200/208/380/400/415/3/50/60 HZ 36/34/20/19/18

TECHNICAL SPECIFICATIONS –Invertec STT II (For Codes 11115 AND 11116)INPUT- THREE PHASE ONLY

RATED OUTPUT

RECOMMENDED INPUT WIRE AND FUSE SIZESINPUT VOLTAGE FUSE(SUPER LAG) INPUT AMPERE TYPE 75°C TYPE 75°CAND FREQUENCY OR BREAKER RATING ON COPPER COPPER

SIZE NAMEPLATE SUPPLY WIRE GROUND WIREIN CONDUIT IN CONDUITAWG (IEC) SIZES AWG (IEC) SIZES

200/50/60 40 36208/50/60 40 34

380/50/60 30 20 10 (6 mm2) 10 (6 mm2)400/50/60 30 19415/50/60 30 18

HEIGHT WIDTH DEPTH WEIGHT

23.2 in 13.2 in. 24.4 in. 100 lbs.

589 mm 336 mm 620 mm 46 kg

OUTPUT

DUTY CYCLE AMPS VOLTS AT RATED AMPS



CURRENT RANGE OPEN CIRCUIT VOLTAGE AUXILIARY POWER

Peak Current 0 - 450 Amps 88 VDC Maximum 115 1 VAC @ 4 AmpsBackground 0 - 125 Amps 42 VAC @ 4 Amps

1 115 VAC not present on European Models.

PHYSICAL DIMENSIONS

A-3INSTALLATION A-3

INVERTEC STT II

ELECTRIC SHOCK can kill.• Only qualified personnel should

perform this installation.

• Turn the input power OFF at the disconnect switch or fuse box before installing this equipment.

• Turn the power switch on the Invertec STT “OFF” before connecting or discon-necting input power lines, output cables, or control cables.

• Do not touch electrically hot parts.

• Always connect the ground terminal to agood electrical earth ground.

WARNING

MACHINE GROUNDING AND HIGHFREQUENCY INTERFERENCE PROTECTION

The machine may not be suitable for use in an envi-ronment where high frequency is present. For exam-ple do not place the machine in close proximity to“TIG” or “PLASMA” operations. To minimize high fre-quency interference:

Locate the STT II power source more than 15feet (4.5 m) away from high frequency unitsand more than 25 feet (7.6 m) separationbetween ground connections or welding arcsof high frequency units.

Provide proper electrical ground to themachine per local and national electricalcodes.

INPUT CONNECTIONS

FAILURE TO FOLLOW THESE INSTRUCTIONSCAN CAUSE IMMEDIATE FAILURE OF COMPO-NENTS WITHIN THE WELDER.

Turn the input power off at the disconnect switchbefore attempting to connect the input power lines.

Connect the green lead of the power cord to groundper local and national electrical codes.

SUPPLY CONNECTIONS

Be sure the voltage, phase, and frequency of the inputsupply is as specified on the rating plate. Input Powersupply line entry in provided on the case back of themachine. See figure A.1 for location of the rating plate.

The Invertec STT II should be connected only by aqualified electrician. Installation should be made inaccordance with local and national codes. Refer tothe “Technical Specifications” at the beginning of thissection for proper fuse sizes, ground wire, and inputsupply power cable sizes.

Some models come from the factory with an inputpower cord. If your model does not include the inputpower cord install the proper size input cable andground cable according to “INPUT CABLE INSTALLA-TION AND CONNECTION”.

SELECT SUITABLE LOCATION

Locate the machine where there is free circulation ofclean air. Place the machine so that air can freely cir-culate into the sides and out of the rear of themachine. Dirt and dust that can be drawn into themachine should be kept to a minimum. Failure toobserve these precautions can result in excessiveoperating temperatures and nuisance shut down ofthe Invertec STT II.

This machine carries an enclosure rating of IP21S. Itshould not be placed in extremely damp or dirty loca-tions. It should not be exposed to rain or snow.

STACKING

The Invertec STT II cannot be stacked.

TILTING

Place the machine on a secure, level surface other-wise the unit may topple over.

Read and understand entire InstallationSection before starting installation.

A-4INSTALLATION A-4

INVERTEC STT II

INPUT CABLE INSTALLATION AND CON-NECTION

A cable strain relief is provided at the supply line entryand is designed to accommodate cable diameters of.310 - 1.070 in. (7.9 - 27.2 mm). On European modelsthe strain relief is designed to accommodate cablediameters of .709 - 1.000 in. (18.0 - 25.4 mm). Referto “Technical Specifications” at the beginning of thissection for the proper input cable sizes. Refer toFigure A.1 and perform the following steps:

1. Remove the wraparound cover of the Invertec STT II.

2. Feed the input cable through the input cableentry access hole at the right rear of themachine.

3. Route the cable through the cable hangers, located along the lower right inside edge of the machine, up to the power switch locatedon the front panel.

4. Strip away 102 mm (4 in.) of the outer jacket. Trim fillers and strip conductor jackets to connect to the power switch.

5. Connect the three phase line con-ductors to the power switch termi-nals labeled U, V and W. Tightenthe connections to 3.0 Nm. (27 in.-lb.) torque.

6. Securely tighten the cable strain relief locatedon the case back of the machine.

GROUND CONNECTION

1. Connect the ground terminal to earth ground per National Electrical Code.

2. Replace the wraparound cover of the Invertec STT II.

CASE BACK

RATING PLATEINPUT CABLEENTRY ACCESS& CABLE STRAIN RELIEF

FIGURE A.1 CASE BACK

A-5INSTALLATION A-5

INVERTEC STT II

FIGURE A.2 RECONNECT PANELINPUT VOLTAGE RECONNECTPROCEDURE

As shipped from the factory, multiple voltagemachines are internally configured for the highestinput voltage (440-460 VAC), for Codes 11092 andbelow and (380-415 VAC), for Codes 11115 and11116.

1. For Connections to 440 or 460 VAC verify theinternal configurations to the procedures shown belowand refer to Figure A.2.

2. For Connections to 200,208,220,230,380,400 or415 VAC follow the procedure shown below and referto figure A.2.

NOTE: Turn main power to the machine OFFbefore performing the reconnect procedure.Failure to do so will result in damage to themachine. DO NOT switch the reconnect bar withmachine power ON.------------------------------------------------------------------------

To Operate at Procedure

460 or 440 VAC 1. Open reconnect panel (Codes 11092 and access door on wrap-around.below) 2. Move input voltage switch

to Voltage = 380 -460V pos-ition.

3. Move lead “A” to 440-460 Terminal.

380 or 415 VAC 1. Open reconnect panel(Codes 11092 and access door on wrap-around.below)

2. Move input voltage switch to Voltage = 380-460Vposition.


380,400 or 415 VAC 1. Open reconnect panel(Codes 11115 and access door on wrap-around.11116) 2. Move input voltage switch

to Voltage = 380-460Vposition.



to Voltage = 200 -230V position.





200 or 208 VAC 1. Open reconnect panel (Codes 11115 and access door on wrap-around.11116) 2. Move input voltage switch



OUTPUT CONNECTIONS

WIRE FEEDER OUTPUT CONNECTIONS

Refer to the Accessories section of this manual forinstructions on connecting a wire feeder to theInvertec STT II.

The LN-742 or STT-10 wire feeder is the recommend-ed feeder for use with the Invertec STT II.

WARNING

4A380-415 OR

OR200-208

*

*

*(NOT PRESENT ON ALL MODELS)

B-1OPERATIONB-1

INVERTEC STT II

ELECTRIC SHOCKcan kill.

• Do not touch electrically live partsor electrode with skin or wetclothing.

• Insulate yourself from work andground.

• Always wear dry insulating gloves.

FUMES AND GASEScan be dangerous.

• Keep your head out of fumes.

• Use ventilation or exhaust toremove fumes from breathingzone.

WELDING SPARKScan cause fire orexplosion

• Keep flammable material away.

• Do not weld on containers thathave held combustibles.

ARC RAYScan burn.

• Wear eye, ear and bodyprotection.

OPERATING INSTRUCTIONS

Read and understand entire section beforeoperating machine.

GENERAL WARNINGS

SAFETY PRECAUTIONS

Observe additional Safety Guidelines detailed in the beginning of this manual.

WARNING

B-2OPERATIONB-2

INVERTEC STT II

GENERAL DESCRIPTION

The Invertec STT II is a 225-ampere inverter basedarc welding power source specifically designed for theSTT welding process. It is neither a constant current(CC) nor a constant voltage (CV) machine. It is apower source that delivers current of a desired waveform and characteristics that are superior to conven-tional short circuiting GMAW. The process is opti-mized for short-circuitingGMAW welding.

RECOMMENDED EQUIPMENT

The LN-742 or STT-10 wire feeder is recommendedfor use with the STT II. The LN-7 GMA, LN-9 GMA,NA-5, and NA-5R can all be used with the STT II.However, these units can only be used to feed wiresince these feeders have no provision for control ofthe STT output.

OPERATING CONTROLS

The Invertec STT II has the following controls as stan-dard: On/Off switch, Peak Current adjustment,Background Current adjustment, Hot Start adjustment,Tailout, and 2 toggle switches; one for wire size selec-tion and one for wire type selection.

DESIGN FEATURES AND ADVANTAGES

• State of the art inverter technology yields highpower efficiency, excellent welding performance,lightweight and compact design.

• Twist-Mate™ output terminals.

• Digital meters for procedure settings are standard.

• Automatic Inductance or Pinch Control.

• Solid state circuitry for extra long component life.

• Current feedback ensures that original proceduresettings all remain constant.

• Arc Sense lead assembly (Electrode and Work),connects through a 4-pin case front connector.

• Peak Current and Background Current may beremotely controlled.

• Thermostat and FET over current protector preventoverheating from overloads, high ambient tempera-tures, or loss of air flow.

• High temperature Class H insulation.

• Protection circuits and ample safety margins preventdamage to the solid state components from tran-sient voltages and high currents.

• Preset welding current capability.

• STT II offers improvements over the previous model.Approximately 40% increase in deposition ratecapability, and a significant increase in travel speed.

WELDING CAPABILITY

The Invertec STT II is rated at 225 amps, 29 volts, at60% duty cycle on a ten minute basis. It is capable ofhigher duty cycles at lower output currents. If the dutycycle(s) are exceeded, a thermal protector will shut offthe output until the machine cools to a reasonableoperating temperature.

LIMITATIONS

• May not be suitable for use in an environment withHigh Frequency present. (“See Machine Groundingand High Frequency Protection” in the Installationsection of this manual)

• Suitable for indoor use only (IEC IP21S).

B-3OPERATIONB-3

INVERTEC STT II

1. POWER SWITCH: Turns outputpower ON and OFF. This switchalso controls auxil iary poweravailable through the 14-pin WireFeeder Receptacle.

2A. BACKGROUND CURRENT OUTPUT CON-TROL: The output current is switched tothe Background level at the conclusion ofthe preceding Peak Current pulse. Thisknob allows preset adjustment of theamplitude of the background current upto 125 amperes.

2B. BACKGROUND CURRENT DISPLAY METER:This is a digital meter for displaying thepreset Background Current. This meterdisplays in 1 amp increments. This meterdoes not indicate the actual welding cur-rent, only the preset current.

3A. PEAK CURRENT OUTPUT CONTROL:The beginning portion of the welding arc isa pulse of current referred to as PeakCurrent. This knob allows preset adjust-ment of the amplitude of the peak currentup to 450 amperes.

3B. PEAK CURRENT DISPLAY METER: Thisis a digital meter for displaying the presetPeak Current. This meter displays in 1amp increments. This meter does notindicate actual welding current only thepreset current.

4. HOT START CONTROL POTENTIOMETER:“Hot Start” provides approximately 25% to50% more current during the initial start ofthe weld for improved arc starting and beadappearance. This control adjusts the dura-tion of this “Hot Start” current. The control range isfrom 0 to 10, where 0 corresponds to the zero or no“Hot Start”, and 10 is maximum for a “Hot Start”lasting for about four (4) seconds.

5. TAILOUT: Alters the current waveform to increasedeposit rate and travel speed. The Minimum set-ting sets STT II to the original STT waveform. Astailout is increased peak and Background currentmay need to be reduced to maintain optimum per-formance.

OPERATIONAL FEATURES AND CONTROLS

All operator controls are located on the case front of the Invertec STT II. Refer to Figure B.1 for locations.

FIGURE B.1 CASE FRONT CONTROLS

4

1

23

7

6

8

10

9

11

14

15 12

13

5

ON

OFF

A

AV

B-4OPERATIONB-4

INVERTEC STT II

6. WIRE SIZE SELECT SWITCH: This toggle switchselects between electrode diameters of .035” (1mm) and smaller or .045” (1.2 mm) and larger. The.035” (1 mm) position provides improved perfor-mance of smaller diameter wires at higher wire feedspeeds.

7. WIRE TYPE SELECT SWITCH: This toggle switchselects between mild or stainless steel. In the stain-less position, the pulse width of the Peak Current ischanged from 1 to 2 ms for better performance forstainless steel welding.

8. THERMAL SHUT-DOWN INDICATOR:This light will indicate that either the internalthermostat(s) or the FET over current sen-sor has actuated. Machine output will return afterthe internal components have returned to normaloperating temperature (if the thermostat(s)“opened”) or after about 3-7 seconds (if the FETover current sensor activated).

9. REMOTE RECEPTACLE: This is a 10 pin MS-type connector for remote control of Peak Currentand Background Current. Trigger switch connec-tions are also provided. The presence of the mating connec-tor is automatically sensed, disabling the front panel Peakand Background Current controls. Refer to “REMOTE CON-TROL CONNECTOR” in the ACCESSORIES Section of thismanual for more information.

10. WIRE FEEDER RECEPTACLE: This is 14pin MS-type connector for the wire feederconnection. 115 and 42 VAC along withthe trigger switch connections are provided. (Only42 VAC is available on European models). Thereare no provisions for voltage control of the powersource by the wire feeder. Refer to theAccessories section of this manual for wire feederconnection instructions.

11. ARC SENSE RECEPTACLE: This is a four pinMS-type connector for WORK and ELECTRODEsense leads. The STT requires a WORK senseand ELECTRODE sense lead for proper operation.The ELECTRODE sense lead is bolted togetherwith power source electrode lead at the wire feedergun block. The WORK sense lead is furnished withan “alligator” type clip for connection to the workpiece. Refer to the LN 742 or STT-10 wire feederconnection instructions in the Accessories sectionof this manual for proper connection of these leads.

12. 42V AUXILIARY POWER CIRCUIT BREAKER:The 42 VAC supply is protected from exces-sive current draws with a 6 amp circuit break-er. When the breaker “trips” its button willextend. Depressing this button will reset the breaker.

13. 115V AUXILIARY POWER CIRCUIT BREAKER(Not on European Models): The 115 VACsupply is protected from excessive currentdraws with a 6 amp circuit breaker. Whenthe breaker “trips” its button will extend.Depressing this button will reset the breaker.

14. WORK TERMINAL: This twist-mate con-nection is the negative output terminal forconnecting a work cable and clamp to theworkpiece.

15. ELECTRODE TERMINAL: This twist-mate connection is the positive output ter-minal for connecting an electrode cable tothe wire feeder conductor block. Refer tothe Accessories Section for wire feeder connectioninstructions.

WELDING OPERATION

Familiarize yourself with the controls on the InvertecSTT II before beginning to weld.

Familiarize yourself with the operating manual for thewire feeder and the wire feeder controls before begin-ning to weld.

Set the Wire Size and Wire Type selection switchesper the appropriate wire. Refer to “OperationalFeatures and Controls” in this section for the functionof these switches.

B-5OPERATIONB-5

INVERTEC STT II

WELDING PARAMETERS AND GUIDE-LINES

The Invertec STT II is neither a constant current (CC)nor a constant voltage (CV) power source. In general,wire diameter will be increased one size compared toconventional (CV) power sources. The larger the wirediameter the higher the deposition rate (Up to 1/16”).Wire sizes below .035” are unnecessary for mostapplications. The Invertec STT II is a current con-trolled machine which is capable of changing the elec-trode current quickly in order to respond to the instan-taneous requirements of the arc and optimize perfor-mance. By sensing changes in welding current, andhence the electrode state, the power source will sup-ply varying output currents to minimize spatter. ThePeak and Background currents are two such currentoutputs that can be adjusted.

Wire Feed Speed controls the deposition rate. PeakCurrent controls the Arc Length. Background Currentcontrols the Bead Contour. And Tailout increasesPower in the Arc.

PEAK CURRENTThe Peak Current control acts similar to an “arc pinch”control. Peak current serves to establish the arclength and promote good fusion. Higher peak currentlevels will cause the arc to broaden momentarily whileincreasing the arc length. If set too high, globular typetransfer will occur. Setting this level to low will causeinstability and wire stubbing. In practice, this currentlevel should be adjusted for minimum spatter andpuddle agitation.

Adjust Arc Length with Peak Current

Note: In 100% CO2 shielding gas applications thepeak current level should be set greater than in a cor-responding application using a gas blend with a highpercentage of Argon. Longer initial arc lengths with100% CO2 are required to reduce spatter.

BACKGROUND CURRENTThe Background Current provides the control for theoverall heat input to the weld. Adjusting this level toohigh will cause a large droplet to form and globulartype transfer to occur resulting in increased spatter.

Adjusting this level to low will cause wire stubbing andalso poor wetting of the weld metal. This is similar toa low voltage setting on a standard CV machine

Adjust Bead Shape using Background Current

Note: Background Current levels for applications using100% CO2 is less than similar procedures involvinggas blends with high percentages of Argon. This is aresult of the greater heat generated in the 100% CO2

arc. (100% CO2 is 35 volts/cm and 100% Argon is 20volts/cm. 75% Argon, 25% CO2 is about 24 volts/cm.

Contact Tip to Work Distance

HOT STARTThe Hot Start control can be set to enhance establish-ing the arc and provide the capability of increasing theheat at the start of the weld to compensate for a coldwork piece. Hot start adjusts the time that additionalcurrent is applied during the starting of the arc. Referto “Operational Features and Controls” in this sectionfor a description of this control.

TAILOUTThe tail out provides additional heat without the moltendroplet becoming too large. Increase as necessary toadd “Heat” to the arc without increasing arc length.(This will allow for faster travel speeds and produceimproved wetting). As tailout is increased, the pealand/or background current is usually reduced.

WELDING ARC PERFORMANCEFor optimum spatter reduction, the arc should be con-centrated on the puddle.

B-6OPERATIONB-6

INVERTEC STT II

WELDING PROCEDURES FOR STT II -(Steel) Horizontal Fillet (See Table B.1 and B.2)

Table B.1 100% CO2 Gas Shield (Set for Steel Mode)

Table B.2 75% CO2 - 25% Ar Gas Shield (Set for Steel Mode)

(Stainless Steel) Horizontal Fillet(See Table B.3 and B.4)

Table B.3 90% He, 7.5% Ar, 2.5% CO2

Gas Shield (Set for Steel Mode)

Table B.4 98% Ar, 2% O2

Gas Shield (Set for Stainless Steel Mode)

45°

END VIEW

75°

FRONT VIEW

DIRECTIONOF

TRAVEL

75°

TOP VIEW

DIRECTIONOF

TRAVEL

Plate Thickness “ (mm) 20 ga 14 ga 10 ga(0.9) (2.0) (3.25)

Electrode size “ (mm) 0.035 0.045 0.045(0.9) (1.1) (1.1)

WFS “/min (m/min) 100 100 170(2.5) (2.5) (4.2)

Peak Current 220 260 280Background Current 30 40 65Tailout setting 3 7 5Average Amperage 60 105 120Travel Speed “/min 12 12 12

(m/min) (0.3) (0.3) (0.3)Gas Flow cfh (L/min) 25 (12)Electrical Stickout “ 1/4 - 3/8

(mm) (6.4 - 10)



WFS “/min (m/min) 100 100 120(2.5) (2.5) (3.0)



(mm) (6.4 - 10)

45°

END VIEW

75°

FRONT VIEW

DIRECTIONOF

TRAVEL

75°

TOP VIEW

DIRECTIONOF

TRAVEL



WFS “/min (m/min) 100 130 170(2.5) (3.3) (4.2)



(mm) (6.4 - 10)



WFS “/min (m/min) 100 130 170(2.5) (3.3) (4.2)



(mm) (6.4 - 10)

C-1ACCESSORIESC-1

INVERTEC STT II

STT control board to accept PEAK and BACK-GROUND inputs on this connector rather than fromthe front panel controls. If this short is removed,the front panel controls will be active. By adding aswitch between pins “J” and “B” a“LOCAL/REMOTE” control switch can be created.(Switch open for “local” and closed for “remote”)

3. For robotic control of the PEAK CURRENT, a 0 to+10 volt DC signal is applied between pins “A” and“G” with + applied to pin “G”. The BACKGROUNDCURRENT is controlled with a similar signal appliedbetween pins “A” and “C” with + applied to pin “C”.In this application pins “J” and “B” must be shortedas described in 2 above.

NOTE: These analog signals should be isolatedfrom the robot circuitry to prevent interference.

4. The trigger switch is connected between pins “D”and “F”. These connections are in parallel with thetrigger switch from the wire feeder.

5. The digital meters for PEAK and BACKGROUNDcurrents will show preset values in both local andremote operation.

OPTIONS / ACCESSORIES

K940 SENSE LEADS: These leads are used to accu-rately sense arc voltage. One set is required for eachSTT II power source. A 10 ft and 25 ft set are provid-ed as standard with the machine. Additional sets areavailable in 10 ft (K940-10), 25 ft (K940-25) and 50 ft(K940-50) lengths.

K942-1 REMOTE CONTROL: Allows remote adjust-ment of Peak and Background Current settings.

REMOTE RECEPTACLE (For optional remote interface,Connection to the STT-10 Wire Feeder or Robotic Control)

1. The 10 pin MS connector labeled “Remote Control”located on the front panel of the STT is used forremote control of the power source. Control for thePEAK (PB pot) and BACKGROUND (BG pot) cur-rent along with the trigger switch is provide throughthis connector.

2. Refer to figure C.1 below for details about theremote receptacle (J38). Note that pins “J” and “B”are shorted together This “short circuit” tells the

+ ARC

- ARC

1234

VOLTAGESENSECONNECTION

J19

290

291

(+)

(-)

JBCGADFHEI

TRIGGER

GND

BG

PB

10K

10K

OPTIONALREMOTEINTERFACE223 7

J38

33C

1234

J37

8

61

584

32

212C43A

212B32C

3

12

10912411

J38

REMOTEPROTECTION BOARD

PORTION OF G3136 WIRING DIAGRAMREFER TO ACTUAL DIAGRAM PASTED INSIDE YOUR MACHINE

N ELECTRODE SENSE LEAD

290A

J39

WIREFEEDER

C-2ACCESSORIESC-2

INVERTEC STT II

LN-742 or STT-10 WIRE FEEDERCONNECTION INSTRUCTIONS

The LN-742 or STT-10 is the recommended wire feed-er for use with the Invertec STT II. Refer to the LN-742 or STT-10 Operator Manual for Wire FeedOperation. Refer to Figure C.2 or C.3 and follow theinstructions below to connect the LN-742 or STT-10.

1. Turn the Invertec STT II power off.

2. Connect the ARC SENSE LEAD MS connector tothe mating connector on STT II front panel.

3. Connect the electrode lead (Twist-Mate) to (+) out-put terminal on STT II.

4. Connect the other end of electrode lead (Step #3)and the ARC SENSE LEAD (lead with ring lug, step#2) together to the gun block on the LN 742.

5. Connect work lead between STT (-) terminal andthe work piece.

6. Connect the ARC SENSE LEAD “WORK” (leadwith alligator clip) to work piece.

NOTE: For best welding performance make thisconnection as close as possible to thewelding arc.

7. Connect the wire feeder control cable between theLN-742 or STT-10 and the 14-pin Wire FeederReceptacle on the STT II. For the STT-10 WireFeeder: Connect the second wire feeder controlcable between the STT-10 and the 10-pin RemoteReceptacle on the STT II.

M17657

ARC SENSE LEAD 'ELECT"

CONNECT ELECTRODE LEAD AND "ELECT"ARC SENSE LEAD TOGETHER TO ELECTRODETERMINAL OF WIRE FEEDER.

ELECTRODE LEAD

Only qualified persons should install,use or service this machine.

WIRE FEEDERLN 742LN7 GMALN9 GMANA5RNA5

WARNING

ELECTRIC SHOCKCAN KILL

Turn off input power to the Welding Power source using the disconnnect switch at the fuse box before connecting the wire feeder.

REMOTE RECEPTACLE

WORK

WORK LEAD

CONTROL, ELECTRODE, ARC SENSE "ELECT"AND ARC SENSE "WORK" CABLES SHOULDBE TAPED TOGETHER.

WIRE FEEDERCONTROL CABLE

ARC SENSE LEAD "WORK"(SHOULD BE LOCATEDAS CLOSE AS POSSIBLETO THE WELDING ARC.)

CRM after 6-10-96

FIGURE C.2 LN-742 to STT II CONNECTION

WARNING

ELECTRIC SHOCK can kill.• Only qualified personnel should perform

this installation.

• Turn the input power OFF at the discon-nect switch or fuse box before connectingthe wire feeder

C-3ACCESSORIESC-3

INVERTEC STT II

CONNECTION DIAGRAM - INVERTEC STT II

4-9-99

M17657-3

CABLES AND LEADS SHOULD

ELECTRODE LEAD

BE TAPED TOGETHER.

WORK (SHOULD BE LOCATEDAS CLOSE AS POSSIBLE

FEEDER

REMOTE

REMOTE

ELECTRODE LEAD

TO THE WELDING ARC)

WORK LEAD

WIRE FEEDER

WIRE FEEDER CONTACT

ELECTRODE SENSE LEADIS BOLTED TOGETHER WITHELECTRODE LEAD ON THE

BLOCK

STT-10WIRE FEEDER

WARNING Turn off input power to the Welding Power source using the disconnnect switch at the fuse box before connecting the wire feeder.

Only qualified persons should install,ELECTRICuse or service this machine. SHOCK

CAN KILL

WIRE

ARC SENSE LEAD "WORK"

FIGURE C.3 STT-10 to STT II CONNECTION

D-1MAINTENANCED-1

INVERTEC STT II

WARNINGFailure to follow thiscapacitor discharge proce-dure can result in electricshock.

INPUT FILTER CAPACITORDISCHARGE PROCEDURE

1. Turn off input power or disconnect inputpower lines.

2. Remove hex head screws from side andtop of machine and remove wrap-aroundmachine cover.

3. Be careful not to make contact with thecapacitor terminals that are located inthe center of the Switch Boards.

4. Obtain a high resistance and highwattage resistor (25-1000 ohms and 25watts minimum). This resistor is not sup-plied with machine. NEVER USE ASHORTING STRAP FOR THIS PROCE-DURE.

5. Locate the two capacitor terminals (largehex head cap screws) shown in Figure D.1.

6. Use safety glasses, electrically insulatedgloves and insulated pliers. Hold body ofthe resistor and connect resistor leadsacross the two capacitor terminals. Holdresistor in place for 10 seconds. DONOT TOUCH CAPACITOR TERMINALSWITH YOUR BARE HANDS.

7. Repeat discharge procedure for capaci-tor on other side of machine.

8. Check voltage across terminals of allcapacitors with a DC voltmeter. Polarityof capacitor terminals is marked on PCboard above terminals. Voltage shouldbe zero. If any voltage remains, repeatthis capacitor discharge procedure.

FIGURE D.1 — LOCATION OF INPUT FILTER CAPACITOR TERMINALS.

D-2MAINTENANCED-2

INVERTEC STT II

PREVENTIVE MAINTENANCE

1. Perform the following preventive mainte-nance procedures at least once every sixmonths. It is good practice to keep a pre-ventive maintenance record; a record tagattached to the machine works best.

2. Remove the machine wraparound coverand perform the input filter capacitor dis-charge procedure (detailed at the begin-ning of this chapter).

3. Clean the inside of the machine with alow pressure airstream. Be sure to cleanthe following components thoroughly.

• Power Switch, Driver, Protection, andControl printed circuit boards

• Power Switch

• Main Transformer

• Input Rectifier

• Heat Sink Fins

• Input Filter Capacitors

• Output Terminals

• Lower base compartment

4. Examine capacitors for leakage or ooz-ing. Replace if needed.

5. Examine wraparound cover for dents orbreakage. Repair as needed. Covermust be kept in good condition to assurehigh voltage parts are protected and cor-rect spacings are maintained.

6. Check electrical ground continuity. Usingan ohmmeter, measure resistancebetween either output stud and anunpainted surface of the machine case.Meter reading should be 500,000 ohmsor more. If meter reading is less than500,000 ohms, check for electrical com-ponents that are not properly insulatedfrom the case. Correct insulation if need-ed.

7. Replace machine cover and screws.

E-1TROUBLESHOOTINGE-1

INVERTEC STT II

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


INVERTEC STT II


CAUTION

Observe Safety Guidelines detailed in the beginning of this manual.

PROBLEMS(SYMPTOMS)

Major physical or electrical damageis evident

Machine has no open circuit voltage.Wire feeds ok.

Machine has no welding output (noopen circuit voltage) and the wirefeeder does not feed wire when thegun trigger is pulled.

POSSIBLE CAUSE

1. Contact your local LincolnAuthorized Field ServiceFacility.

1. Check the control cable betweenthe feeder and the STT II II unit.Make sure the #2 and #4 leadsare intact.

2. Put a jumper wire between Pins“C” and “D” on the 14 pin MSconnector. If normal open circuitvoltage (85VDC.) is restoredthen the problem is in feedercontrol cable or the wire feeder.

1. The 42VAC circuit breaker CB1may be tripped. Reset if neces-sary.

2. Put a jumper between pins “A”and “C” on the 5 pin MS connec-tor located on the LN742 wirefeeder. If wire feeds check thegun trigger. Repair or replace ifnecessary.

3. Check for the presence of 42ACat pins “K” and “I” on the 14 pinMS connector. If the 42VAC ispresent and the feeder does notwork the problem is in the feedercontrol cable(s) or the wire feed-er.

RECOMMENDEDCOURSE OF ACTION

If all recommended possible areasof misadjustment have beenchecked and the problem persists,Contact your local LincolnAuthorized Field ServiceFacility.

OUTPUT PROBLEMS


INVERTEC STT II


CAUTION


PROBLEMS(SYMPTOMS)

No output. Main fuses open, indicat-ing excessive current draw.

Machine loses output when gun trig-ger is pulled or arc is struck.Machine output returns after a fewseconds and trigger is pulled again.The Thermal indicator light is lit.

Machine is dead - no output -nofans - no display.

POSSIBLE CAUSE

1. With input power removedinspect input leads for possibleshorts or grounds or misconnec-tions.

2. Install new fuses and reapplypower. If fuses open again con-tact your local Lincoln AuthorizedField Service Facility.

1. The over current sensor is beingactivated indicating that too muchoutput current is being drawnfrom the machine. Reduce weld-ing current demands or remove“fault” in welding cables.

2. Make sure that the gun tip is not“shorted” to the work surface andthat the proper welding proce-dures are being used.

1. Power switch must be in the“ON” position.

2. Check the input voltage. Makesure all three phases are appliedto the machine.

3. With input power removed checkthat the input voltage set-upswitch and jumper “A” ( thereconnect auxiliary jumper) are inthe proper position for input volt-age being used. See ReconnectProcedure in the InstallationSection.

4. With input power removed checkcontinuity of 3 amp slow blowfuse located on reconnect panel.



OUTPUT PROBLEMS


INVERTEC STT II


CAUTION


PROBLEMS(SYMPTOMS)

No output or reduced output the firstt ime power is applied to themachine.

Machine loses output while welding.The thermal indicator light is lit.Normal welding output returns afterabout 10 minutes.

Machine has low OCV, and losesoutput while attempting to weld.

POSSIBLE CAUSE

1. Check input voltages, fuses andinput voltage reconnect proce-dures. See Installation section.

2. If high input voltage (380VAC orhigher) is applied, the capacitorsmay need conditioning. Let the“unloaded” machine idle for 30minutes.

1. Check to make sure the fans arerunning and operating correctly.

2. Welding application may exceedrecommended duty cycle.

3. Dirt and dust may have cloggedthe cooling channels. Blow outunit with clean, dry compressedair.

4. Air intake and exhaust louversmay be blocked due to inade-quate clearance around machine.

1. Check for faulty connection onplug J1 on Control Board andplug J1 on Current Sense Board.

2. Check for faulty Current SenseBoard.



OUTPUT PROBLEMS


INVERTEC STT II


CAUTION


PROBLEMS(SYMPTOMS)

Excessive weld spatter. Arc soundsand looks l ike a standard MIGprocess.

The wire burns back to the tip.

Poor welding, weld settings drift oroutput power is low.

POSSIBLE CAUSE

1. Check the Arc Sense leads forloose or faulty connections.

2. Make sure the Arc Sense“WORK” lead is as close as pos-sible to the welding arc.

3. Make sure the machine and wirefeed settings are correct for theprocess and wire being used.

1.Remove P1 from the controlboard if the machine noodlewelds, the current sense board isbad.

1. Make sure machine settings arecorrect for welding process beingused.

2. Check welding cables for looseor faulty connections.



OUTPUT PROBLEMS


INVERTEC STT II


CAUTION


PROBLEMS(SYMPTOMS)

Porosity in the weld

Weld bead appears “cold”.

Molten weld puddle appears exces-sively “violent”.

POSSIBLE CAUSE

1. Make sure proper gas type andflow rate is correct for procedurebeing used. Shield work fromexcessive outside air currents.

2. Check gun and nozzle for leaksor obstructions.

3. Make certain machine and wirefeed settings are correct forprocess.

1. One or more of the machine set-tings may be wrong. Check theBackground, Peak Current,Tailout and wire speed controlsfor proper settings. Adjust foroptimum welding performance.

2. Make sure the Wire Type, andWire Size switches are in the cor-rect position for the electrodewire being used.

1. The Wire Type switch may be inthe wrong position for the elec-trode wire being used.

2. The Peak Current setting may betoo high. Adjust for optimumwelding performance.



OUTPUT PROBLEMS

F-1DIAGRAMSF-1

INVERTEC STT II

R

32A

32B

15 16J22

R B 18V

32C

43A

R U3

18V

501

B

504

W4 5

5

275

1863

311

10J6

1

212A

97

212

352

212B

503A

Y 301

305

245

223

8 11 3 1

350

324

V

351

244

CA

SE

5

8

CA

SE

BA

CK

16

10

PLA

TFO

RM

4 A

MP

309

W

1450

3AS

BO

TT

OM S

OU

TS

IDE

IY

Y

4,5

12D

N O O12

H3

H1 F

AN

SLO

W

12B

RIG

HT

MO

TO

R

BLO

W

H1

1J11

65

379

2

J9

CR

2

H3

34

2W10K

CW

(M

AX

)

353

362

363

CO

NT

RO

LB

AC

KG

RO

UN

D

2 12 6 7 4 103

N.L

.

AS

SE

MB

LY

IN

PU

T

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F-4DIAGRAMSF-4

INVERTEC STT II

13.1

9

20.7

5

23.2

5

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1

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9-98

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6

DIM

EN

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T -

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NOTES

INVERTEC STT II

NOTES

INVERTEC STT II

WARNING

AVISO DEPRECAUCION

ATTENTION

WARNUNG

ATENÇÃO

Spanish

French

German

Portuguese

Japanese

Chinese

Korean

Arabic

READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO BEUSED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES.

SE RECOMIENDA LEER Y ENTENDER LAS INSTRUCCIONES DEL FABRICANTE PARA EL USO DE ESTE EQUIPO Y LOSCONSUMIBLES QUE VA A UTILIZAR, SIGA LAS MEDIDAS DE SEGURIDAD DE SU SUPERVISOR.

LISEZ ET COMPRENEZ LES INSTRUCTIONS DU FABRICANT EN CE QUI REGARDE CET EQUIPMENT ET LES PRODUITS AETRE EMPLOYES ET SUIVEZ LES PROCEDURES DE SECURITE DE VOTRE EMPLOYEUR.

LESEN SIE UND BEFOLGEN SIE DIE BETRIEBSANLEITUNG DER ANLAGE UND DEN ELEKTRODENEINSATZ DES HER-STELLERS. DIE UNFALLVERHÜTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN.

Do not touch electrically live parts orelectrode with skin or wet clothing.

Insulate yourself from work andground.

No toque las partes o los electrodosbajo carga con la piel o ropa moja-da.

Aislese del trabajo y de la tierra.

Ne laissez ni la peau ni des vête-ments mouillés entrer en contactavec des pièces sous tension.

Isolez-vous du travail et de la terre.

Berühren Sie keine stromführendenTeile oder Elektroden mit IhremKörper oder feuchter Kleidung!

Isolieren Sie sich von denElektroden und dem Erdboden!

Não toque partes elétricas e elec-trodos com a pele ou roupa molha-da.

Isole-se da peça e terra.

Keep flammable materials away.

Mantenga el material combustiblefuera del área de trabajo.

Gardez à l’écart de tout matérielinflammable.

Entfernen Sie brennbarres Material!

Mantenha inflamáveis bem guarda-dos.

Wear eye, ear and body protection.

Protéjase los ojos, los oídos y elcuerpo.

Protégez vos yeux, vos oreilles etvotre corps.

Tragen Sie Augen-, Ohren- und Kör-perschutz!

Use proteção para a vista, ouvido ecorpo.

WARNING

AVISO DEPRECAUCION

ATTENTION

WARNUNG

ATENÇÃO

Spanish

French

German

Portuguese

Japanese

Chinese

Korean

Arabic

LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA ASPRÁTICAS DE SEGURANÇA DO EMPREGADOR.

Keep your head out of fumes. Use ventilation or exhaust to

remove fumes from breathing zone.

Los humos fuera de la zona de res-piración.

Mantenga la cabeza fuera de loshumos. Utilice ventilación oaspiración para gases.

Gardez la tête à l’écart des fumées. Utilisez un ventilateur ou un aspira-

teur pour ôter les fumées des zonesde travail.

Vermeiden Sie das Einatmen vonSchweibrauch!

Sorgen Sie für gute Be- undEntlüftung des Arbeitsplatzes!

Mantenha seu rosto da fumaça. Use ventilação e exhaustão para

remover fumo da zona respiratória.

Turn power off before servicing.

Desconectar el cable de ali-mentación de poder de la máquinaantes de iniciar cualquier servicio.

Débranchez le courant avant l’entre-tien.

Strom vor Wartungsarbeitenabschalten! (Netzstrom völlig öff-nen; Maschine anhalten!)

Não opere com as tampas removidas. Desligue a corrente antes de fazer

serviço. Não toque as partes elétricas nuas.

Do not operate with panel open orguards off.

No operar con panel abierto oguardas quitadas.

N’opérez pas avec les panneauxouverts ou avec les dispositifs deprotection enlevés.

Anlage nie ohne Schutzgehäuseoder Innenschutzverkleidung inBetrieb setzen!

Mantenha-se afastado das partesmoventes.

Não opere com os paineis abertosou guardas removidas.

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Documents

INVERTEC S T T II · special precautions should be used to prevent hazardous situations. Refer to “Safety in Welding and Cutting” (ANSI Standard Z49.1) and the operating information