Thermal Arc Inverter Arc Welder Model LT300 CC/Tig Manuel utilisateur

Marque: Thermal Arc

Modèle: Inverter Arc Welder Model LT300 CC/Tig

Catégorie: Système de soudage

Taper: Manuel utilisateur

INVERTER

ARC

WELDER

MODEL LT300 CC/TIG

• STICK

• TIG - HIGH FREQUENCY

- LIFT START

OPERATING MANUAL

July 1, 1997

Manual No. 0-2501

GENERALMANUAL 0-2501

WARNING Read and understand this entire Operating Manual and your

employer’s safety practices before installing, operating, or servicing

the equipment.

WARNING While the information contained in this Operating Manual represents

our best judgement, Thermal Dynamics Corporation assumes no

liability for its use.

Thermal Arc Models LT300 CC Welder

Operating Manual Number 0-2501

Published by:

Thermal Dynamics Corporation

Industrial Park No. 2

West Lebanon, New Hampshire, USA 03784

(603) 298-5711

Thermal Dynamics Corporation

Reproduction of this work, in whole or in part, without written

permission of the publisher is prohibited.

The publisher does not assume and hereby disclaims any liability to

any party for any loss or damage caused by any error or omission in

this Operating Manual, whether such error results from negligence,

accident, or any other cause.

Printed in the United States of America

July 1, 1997

TABLE OF CONTENTS

1.0 GENERAL INFORMATION .....................................................2

1.01 Notes, Cautions and Warnings.......................................... 2

1.02 Important Safety Precautions ............................................3

1.03 Publications...........................................................................6

1.04 Note, Attention et Avertissement ......................................7

1.05 Precautions De Securite Importantes ...............................8

1.06 Documents De Reference ................................................. 11

1.07 Declaration of Conformity................................................12

1.08 Statement of Warranty ......................................................13

2.0 INTRODUCTION & DESCRIPTION......................................15

2.01 Description..........................................................................15

2.02 Functional Block Diagrams ..............................................16

2.03 Transporting Methods.......................................................17

2.04 Electrical Input Connections ............................................17

2.05 Specifications ......................................................................20

2.06 Duty Cycle ..........................................................................21

3.0 OPERATOR CONTROLS .....................................................22

3.01 LS Front & Rear Panels .....................................................22

3.02 Setup for Operation ...........................................................24

Shielded Metal Arc Welding (SMAW) .........................................25

Gas Tungsten Arc Welding (GTAW) Lift Start ...........................26

Gas Tungsten Arc Welding-Pulsed(GTAW-P)

-Soped (GTA-S) -TIG Spot .............................................................28

4.0 BASIC TROUBLESHOOTING ..............................................31

4.01 Common Welding Operation Faults............................... 31

4.02 Specific Problems ...............................................................31

4.03 Remote 8-Pin Connections ...............................................35

APPENDIX A – ACCESSORIES ................................................36

APPENDIX B – INTERCONNECTION DIAGRAMS ...................39

GENERAL MANUAL 0-2501

1.0 GENERAL INFORMATION

1.01 NOTES, CAUTIONS AND WARNINGS

Throughout this manual, notes, cautions, and warnings are used to

highlight important information. These highlights are categorized as

follows:

NOTE An operation, procedure, or background information which requires

additional emphasis or is helpful in efficient operation of the system.

CAUTION A procedure which, if not properly followed, may cause damage to the

equipment.

WARNING A procedure which, if not properly followed, may cause injury to the

operator or others in the operating area.

GENERALMANUAL 0-2501

WARNING

1.02 IMPORTANT SAFETY PRECAUTIONS

OPERATION AND MAINTENANCE OF PLASMA ARC EQUIPMENT

CAN BE DANGEROUS AND HAZARDOUS TO YOUR HEALTH.

To prevent possible injury, read, understand and follow all warnings, safety precautions and

instructions before using the equipment. Call 1-603-298-5711 or your local distributor if you have any

questions.

GASES AND FUMES Gases and fumes produced during the plasma cutting process can be

dangerous and hazardous to your health.

• Keep all fumes and gases from the breathing area. Keep your head out

of the welding fume plume.

• Use an air-supplied respirator if ventilation is not adequate to remove

all fumes and gases.

• The kinds of fumes and gases from the plasma arc depend on the kind

of metal being used, coatings on the metal, and the different

processes. You must be very careful when cutting or welding any

metals which may contain one or more of the following:

Antimony Chromium Mercury

Arsenic Cobalt Nickel

Barium Copper Selenium

Beryllium Lead Silver

Cadmium Manganese Vanadium

• Always read the Material Safety Data Sheets (MSDS) that should be

supplied with the material you are using. These MSDSs will give

you the information regarding the kind and amount of fumes and

gases that may be dangerous to your health.

• For information on how to test for fumes and gases in your

workplace, refer to item 1 in the Publications Section in this manual.

• Use special equipment, such as water or down draft cutting tables, to

capture fumes and gases.

• Do not use the plasma torch in an area where combustible or

explosive gases or materials are located.

• Phosgene, a toxic gas, is generated from the vapors of chlorinated

solvents and cleansers. Remove all sources of these vapors.

GENERAL MANUAL 0-2501

IMPORTANT SAFETY PRECAUTIONS (CONTINUED)

ELECTRIC SHOCK Electric Shock can injure or kill. The plasma arc process uses and produces

high voltage electrical energy. This electric energy can cause severe or fatal

shock to the operator or others in the workplace.

• Never touch any parts that are electrically “live” or “hot.”

• Wear dry gloves and clothing. Insulate yourself from the work piece

or other parts of the welding circuit.

• Repair or replace all worn or damaged parts.

• Extra care must be taken when the workplace is moist or damp.

• Install and maintain equipment according to NEC code, refer to item 4

in the Publications section of this manual.

• Disconnect power source before performing any service or repairs.

• Read and follow all the instructions in the Operating Manual.

FIRE AND EXPLOSION Fire and explosion can be caused by hot slag, sparks, or the plasma arc.

• Be sure there is no combustible or flammable material in the

workplace. Any material that cannot be removed must be protected.

• Ventilate all flammable or explosive vapors from the workplace.

• Do not cut or weld on containers that may have held combustibles.

• Provide a fire watch when working in an area where fire hazards may

exist.

• Hydrogen gas may be formed and trapped under aluminum

workpieces when they are cut underwater or while using a water

table. DO NOT cut aluminum alloys underwater or on a water table

unless the hydrogen gas can be eliminated or dissipated. Trapped

hydrogen gas that is ignited will cause an explosion.

NOISE Noise can cause permanent hearing loss. Plasma arc processes can cause

noise levels to exceed safe limits. You must protect your ears from loud

noise to prevent permanent loss of hearing.

• To protect your hearing from loud noise, wear protective ear plugs

and/or ear muffs. Protect others in the workplace.

• Noise levels should be measured to be sure the decibels (sound) do

not exceed safe levels.

• For information on how to test for noise, see item 1 in the Publications

section of this manual.

GENERALMANUAL 0-2501

IMPORTANT SAFETY PRECAUTIONS (CONTINUED)

PLASMA ARC RAYS Plasma Arc Rays can injure your eyes and burn your skin. The plasma arc

process produces very bright ultra violet and infra red light. These arc rays

will damage your eyes and burn your skin if you are not properly

protected.

• To protect your eyes, always wear a welding helmet or shield. Also

always wear safety glasses with side shields, goggles or other

protective eye wear.

• Wear welding gloves and suitable clothing to protect your skin from

the arc rays and sparks.

• Keep helmet and safety glasses in good condition. Replace lenses

when cracked, chipped or dirty.

• Protect others in the work area from the arc rays. Use protective

booths, screens or shields.

• Use the shade of lens as recommended in the Operating Manual.

6GENERAL

MANUAL 0-2501

1.03 PUBLICATIONS

Refer to the following standards or their latest revisions for more information:

1. OSHA, SAFETY AND HEALTH STANDARDS, 29CFR 1910, obtainable from the Superintendent

of Documents, U.S. Government Printing Office, Washington, D.C. 20402

2. ANSI Standard Z49.1, SAFETY IN WELDING AND CUTTING, obtainable from the American

Welding Society, 550 N.W. LeJeune Rd, Miami, FL 33126

3. NIOSH, SAFETY AND HEALTH IN ARC WELDING AND GAS WELDING AND CUTTING,

obtainable from the Superintendent of Documents, U.S. Government Printing Office,

Washington, D.C. 20402

4. ANSI Standard Z87.1, SAFE PRACTICES FOR OCCUPATION AND EDUCATIONAL EYE AND

FACE PROTECTION, obtainable from American National Standards Institute, 1430 Broadway,

New York, NY 10018

5. ANSI Standard Z41.1, STANDARD FOR MEN’S SAFETY-TOE FOOTWEAR, obtainable from the

American National Standards Institute, 1430 Broadway, New York, NY 10018

6. ANSI Standard Z49.2, FIRE PREVENTION IN THE USE OF CUTTING AND WELDING

PROCESSES, obtainable from American National Standards Institute, 1430 Broadway, New York,

NY 10018

7. AWS Standard A6.0, WELDING AND CUTTING CONTAINERS WHICH HAVE HELD

COMBUSTIBLES, obtainable from American Welding Society, 550 N.W. LeJeune Rd, Miami, FL

33126

8. NFPA Standard 51, OXYGEN-FUEL GAS SYSTEMS FOR WELDING, CUTTING AND ALLIED

PROCESSES, obtainable from the National Fire Protection Association, Batterymarch Park,

Quincy, MA 02269

9. NFPA Standard 70, NATIONAL ELECTRICAL CODE, obtainable from the National Fire

Protection Association, Batterymarch Park, Quincy, MA 02269

10. NFPA Standard 51B, CUTTING AND WELDING PROCESSES, obtainable from the National

Fire Protection Association, Batterymarch Park, Quincy, MA 02269

11. CGA Pamphlet P-1, SAFE HANDLING OF COMPRESSED GASES IN CYLINDERS,

obtainable from the Compressed Gas Association, 1235 Jefferson Davis Highway, Suite 501,

Arlington, VA 22202

12. CSA Standard W117.2, CODE FOR SAFETY IN WELDING AND CUTTING, obtainable

from the Canadian Standards Association, Standards Sales, 178 Rexdale Boulevard, Rexdale,

Ontario, Canada M9W 1R3

13. NWSA booklet, WELDING SAFETY BIBLIOGRAPHY obtainable from the National

Welding Supply Association, 1900 Arch Street, Philadelphia, PA 19103

14. American Welding Society Standard AWSF4.1, RECOMMENDED SAFE PRACTICES FOR

THE PREPARATION FOR WELDING AND CUTTING OF CONTAINERS AND PIPING THAT

HAVE HELD HAZARDOUS SUBSTANCES, obtainable from the American Welding Society, 550

N.W. LeJeune Rd, Miami, FL 33126

15. ANSI Standard Z88.2, PRACTICE FOR RESPIRATORY PROTECTION, obtainable from

American National Standards Institute, 1430 Broadway, New York, NY 10018

GENERALMANUAL 0-2501

1.04 NOTE, ATTENTION ET AVERTISSEMENT

Dans ce manuel, les mots “note,” “attention,” et “avertissement” sont

utilisés pour mettre en relief des informations à caractère important. Ces

mises en relief sont classifiées comme suit :

NOTET oute opération, procédure ou renseignement général sur lequel il importe

d’insister davantage ou qui contribue à l’efficacité de fonctionnement du

système.

ATTENTION Toute procédure pouvant résulter l’endommagement du matériel en cas

de non-respect de la procédure en question.

AVERTISSEMENT Toute procédure pouvant provoquer des blessures de l’opérateur

ou des autres personnes se trouvant dans la zone de travail en cas de non-

respect de la procédure en question.

GENERAL MANUAL 0-2501

AVERTISSEMENT

1.05 PRECAUTIONS DE SECURITE IMPORTANTES

L’OPÉRATION ET LA MAINTENANCE DU MATÉRIEL DE SOUDAGE

À L’ARC AU JET DE PLASMA PEUVENT PRÉSENTER

DES RISQUES ET DES DANGERS DE SANTÉ.

Il faut communiquer aux opérateurs et au personnel TOUS les dangers possibles. Afin d’éviter les

blessures possibles, lisez, comprenez et suivez tous les avertissements, toutes les précautions de

sécurité et toutes les consignes avant d’utiliser le matériel. Composez le + 603-298-5711 ou votre

distributeur local si vous avez des questions.

FUMÉE et GAZ La fumée et les gaz produits par le procédé de jet de plasma peuvent

présenter des risques et des dangers de santé.

• Eloignez toute fumée et gaz de votre zone de respiration. Gardez

votre tête hors de la plume de fumée provenant du chalumeau.

• Utilisez un appareil respiratoire à alimentation en air si l’aération

fournie ne permet pas d’éliminer la fumée et les gaz.

• Les sortes de gaz et de fumée provenant de l’arc de plasma dépendent

du genre de métal utilisé, des revêtements se trouvant sur le métal

et des différents procédés. Vous devez prendre soin lorsque vous

coupez ou soudez tout métal pouvant contenir un ou plusieurs des

éléments suivants:

antimoine cadmium mercure

argent chrome nickel

arsenic cobalt plomb

baryum cuivre sélénium

béryllium manganèse vanadium

• Lisez toujours les fiches de données sur la sécurité des matières (sigle

américain “MSDS”); celles-ci devraient être fournies avec le matériel

que vous utilisez. Les MSDS contiennent des renseignements quant

à la quantité et la nature de la fumée et des gaz pouvant poser des

dangers de santé.

• Pour des informations sur la manière de tester la fumée et les gaz de

votre lieu de travail, consultez l’article 1 et les documents cités à la

page 11.

• Utilisez un équipement spécial tel que des tables de coupe à débit

d’eau ou à courant descendant pour capter la fumée et les gaz.

• N’utilisez pas le chalumeau au jet de plasma dans une zone où se

trouvent des matières ou des gaz combustibles ou explosifs.

• Le phosgène, un gaz toxique, est généré par la fumée provenant des

solvants et des produits de nettoyage chlorés. Eliminez toute source

de telle fumée.

GENERALMANUAL 0-2501

PRECAUTIONS DE SECURITE IMPORTANTES

CHOC ELECTRIQUE Les chocs électriques peuvent blesser ou même tuer. Le procédé au jet de

plasma requiert et produit de l’énergie électrique haute tension. Cette

énergie électrique peut produire des chocs graves, voire mortels, pour

l’opérateur et les autres personnes sur le lieu de travail.

• Ne touchez jamais une pièce “sous tension” ou “vive”; portez des

gants et des vêtements secs. Isolez-vous de la pièce de travail ou des

autres parties du circuit de soudage.

• Réparez ou remplacez toute pièce usée ou endommagée.

• Prenez des soins particuliers lorsque la zone de travail est humide ou

moite.

• Montez et maintenez le matériel conformément au Code électrique

national des Etats-Unis. (Voir la page 6, article 9.)

• Débranchez l’alimentation électrique avant tout travail d’entretien ou

de réparation.

• Lisez et respectez toutes les consignes du Manuel de consignes.

INCENDIE ET

EXPLOSION Les incendies et les explosions peuvent résulter des scories chaudes, des

étincelles ou de l’arc de plasma. Le procédé à l’arc de plasma produit du

métal, des étincelles, des scories chaudes pouvant mettre le feu aux

matières combustibles ou provoquer l’explosion de fumées inflammables.

• Soyez certain qu’aucune matière combustible ou inflammable ne se

trouve sur le lieu de travail. Protégez toute telle matière qu’il est

impossible de retirer de la zone de travail.

• Procurez une bonne aération de toutes les fumées inflammables ou

explosives.

• Ne coupez pas et ne soudez pas les conteneurs ayant pu renfermer

des matières combustibles.

• Prévoyez une veille d’incendie lors de tout travail dans une zone

présentant des dangers d’incendie.

• Le gas hydrogène peut se former ou s’accumuler sous les pièces de

travail en aluminium lors’quelles sont coupeés sous l’eau ou sur une

table d’eau. NE PAS couper les alliages en aluminium sous l’eau ou

sur une table d’eau à mains que le gas hydrogène peut s’échapper

ou se dissiper. Le gas hydrogène accumulé explosera si enflammé.

GENERAL MANUAL 0-2501

PRECAUTIONS DE SECURITE IMPORTANTES

RAYONS D’ARC

DE PLASMA Les rayons provenant de l’arc de plasma peuvent blesser vos yeux et

brûler votre peau. Le procédé à l’arc de plasma produit une lumière infra-

rouge et des rayons ultra-violets très forts. Ces rayons d’arc nuiront à vos

yeux et brûleront votre peau si vous ne vous protégez pas correctement.

• Pour protéger vos yeux, portez toujours un casque ou un écran de

soudeur. Portez toujours des lunettes de sécurité munies de parois

latérales ou des lunettes de protection ou une autre sorte de

protection oculaire.

• Portez des gants de soudeur et un vêtement protecteur approprié

pour protéger votre peau contre les étincelles et les rayons de l’arc.

• Maintenez votre casque et vos lunettes de protection en bon état.

Remplacez toute lentille sale ou comportant fissure ou rognure.

• Protégez les autres personnes se trouvant sur la zone de travail contre

les rayons de l’arc en fournissant des cabines ou des écrans de

protection.

• Respectez le teint de lentille recommandé dans le manuel de

consignes.

BRUIT Le bruit peut provoquer une perte permanente de l’ouïe. Les procédés de

soudage à l’arc de plasma peuvent provoquer des niveaux sonores

supérieurs aux limites normalement acceptables. Vous dúvez vous

protéger les oreilles contre les bruits forts afin d’éviter une perte

permanente de l’ouïe.

• Pour protéger votre ouïe contre les bruits forts, portez des tampons

protecteurs et/ou des protections auriculaires. Protégez également

les autres personnes se trouvant sur le lieu de travail.

• Il faut mesurer les niveaux sonores afin d’assurer que les décibels (le

bruit) ne dépassent pas les niveaux sûrs.

• Pour des renseignements sur la manière de tester le bruit, consultez

l’article 1, page 11.

11 GENERAL

MANUAL 0-2501

1.06 DOCUMENTS DE REFERENCE

Consultez les normes suivantes ou les révisions les plus récentes ayant été faites à celles-ci pour de plus

amples renseignements :

1. OSHA, NORMES DE SÉCURITÉ DU TRAVAIL ET DE PROTECTION DE LA SANTÉ, 29CFR

1910, disponible auprès du Superintendent of Documents, U.S. Government Printing Office,

Washington, D.C. 20402

2. Norme ANSI Z49.1, LA SÉCURITÉ DES OPÉRATIONS DE COUPE ET DE SOUDAGE,

disponible auprès de la Société Américaine de Soudage (American Welding Society), 550 N.W.

LeJeune Rd., Miami, FL 33126

3. NIOSH, LA SÉCURITÉ ET LA SANTÉ LORS DES OPÉRATIONS DE COUPE ET DE SOUDAGE

À L’ARC ET AU GAZ, disponible auprès du Superintendent of Documents, U.S. Government

Printing Office, Washington, D.C. 20402

4. Norme ANSI Z87.1, PRATIQUES SURES POUR LA PROTECTION DES YEUX ET DU VISAGE

AU TRAVAIL ET DANS LES ECOLES, disponible de l’Institut Américain des Normes Nationales

(American National Standards Institute), 1430 Broadway, New York, NY 10018

5. Norme ANSI Z41.1, NORMES POUR LES CHAUSSURES PROTECTRICES, disponible auprès de

l’American National Standards Institute, 1430 Broadway, New York, NY 10018

6. Norme ANSI Z49.2, PRÉVENTION DES INCENDIES LORS DE L’EMPLOI DE PROCÉDÉS DE

COUPE ET DE SOUDAGE, disponible auprès de l’American National Standards Institute, 1430

Broadway, New York, NY 10018

7. Norme A6.0 de l’Association Américaine du Soudage (AWS), LE SOUDAGE ET LA COUPE DE

CONTENEURS AYANT RENFERMÉ DES PRODUITS COMBUSTIBLES, disponible auprès de la

American Welding Society, 550 N.W. LeJeune Rd., Miami, FL 33126

8. Norme 51 de l’Association Américaine pour la Protection contre les Incendies (NFPA), LES

SYSTEMES À GAZ AVEC ALIMENTATION EN OXYGENE POUR LE SOUDAGE, LA COUPE

ET LES PROCÉDÉS ASSOCIÉS, disponible auprès de la National Fire Protection Association,

Batterymarch Park, Quincy, MA 02269

9. Norme 70 de la NFPA, CODE ELECTRIQUE NATIONAL, disponible auprès de la National Fire

Protection Association, Batterymarch Park, Quincy, MA 02269

10. Norme 51B de la NFPA, LES PROCÉDÉS DE COUPE ET DE SOUDAGE, disponible auprès

de la National Fire Protection Association, Batterymarch Park, Quincy, MA 02269

11. Brochure GCA P-1, LA MANIPULATION SANS RISQUE DES GAZ COMPRIMÉS EN

CYLINDRES, disponible auprès de l’Association des Gaz Comprimés (Compressed Gas

Association), 1235 Jefferson Davis Highway, Suite 501, Arlington, VA 22202

12. Norme CSA W117.2, CODE DE SÉCURITÉ POUR LE SOUDAGE ET LA COUPE,

disponible auprès de l’Association des Normes Canadiennes, Standards Sales, 178 Rexdale

Boulevard, Rexdale, Ontario, Canada, M9W 1R3

13. ivret NWSA, BIBLIOGRAPHIE SUR LA SÉCURITÉ DU SOUDAGE, disponible auprès de

l’Association Nationale de Fournitures de Soudage (National Welding Supply Association), 1900

Arch Street, Philadelphia, PA 19103

14. Norme AWSF4.1 de l’Association Américaine de Soudage, RECOMMANDATIONS DE

PRATIQUES SURES POUR LA PRÉPARATION À LA COUPE ET AU SOUDAGE DE

CONTENEURS ET TUYAUX AYANT RENFERMÉ DES PRODUITS DANGEREUX , disponible

auprès de la American Welding Society, 550 N.W. LeJeune Rd., Miami, FL 33126

15. Norme ANSI Z88.2, PRATIQUES DE PROTECTION RESPIRATOIRE, disponible auprès de

l’American National Standards Institute, 1430 Broadway, New York, NY 10018

12GENERAL

MANUAL 0-2501

1.07 DECLARATION OF CONFORMITY

Manufacturer: Thermal Dynamics Corporation

Address: Industrial Park #2

West Lebanon, New Hampshire 03784

USA

The equipment described in this manual conforms to all applicable aspects and regulations of the ‘Low

Voltage Directive’ (European Council Directive 73/23/EU, as recently changed in Directive 93/63/EU)

and to the National legislation for the enforcement of this Directive.

The equipment described in this manual conforms to all applicable aspects and regulations of the “EMC

Directive” (European Council Directive 89/336/EEC) and to the National legislation for the

enforcement of this Directive.

Serial numbers are unique with each individual piece of equipment and details description, parts used

to manufacture a unit and date of manufacture.

National Standard and Technical Specifications

The product is designed and manufactured to a number of standards and technical requirements

among them are:

* CSA (Canadian Standards Association) standard C22.2 number 60-M1990 for Arc welding equipment.

* UL (Underwriters Laboratory) rating 94VO flammability testing for all printed-circuit boards used.

* CENELEC EN50199 EMC Product Standard for Arc Welding Equipment March 1995.

* IEC 974-1 (BS 638-PT10) (EN 60 974-1) applicable to welding equipment and associated accessories.

* Extensive product design verification is conducted at the manufacturing facility as part of the routine

design and manufacturing process, to ensure the product is safe and performs as specified. Rigorous

testing is incorporated into the manufacturing process to ensure the manufactured product meets or

exceeds all design specifications.

Thermal Dynamics has been manufacturing products that perform in a safe manner for more than 30

years and will continue to achieve excellence in our area of manufacture.

Manufacturers responsible representative: David Ashworth

Vice President & Managing Director

Thermadyne Europe

Chorley England.

13 GENERAL

MANUAL 0-2501

1.08 STATEMENT OF WARRANTY

LIMITED WARRANTY: Thermal Dynamics Corporation (hereinafter “Thermal”) warrants that its

products will be free of defects in workmanship or material. Should any failure to conform to this

warranty appear within the time period applicable to the Thermal products as stated below, Thermal

shall, upon notification thereof and substantiation that the product has been stored, installed, operated,

and maintained in accordance with Thermal’s specifications, instructions, recommen dations and

recognized standard industry practice, and not subject to misuse, repair, neglect, alteration, or accident,

correct such defects by suitable repair or replacement, at Thermal’s sole option, of any components or

parts of the product determined by Thermal to be defective.

THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY WARRANTY OF MERCHANTABILITY

OR FITNESS FOR A PARTICULAR PURPOSE.

LIMITATION OF LIABILITY: Thermal shall not under any circumstances be liable for special or

consequential damages, such as, but not limited to, damage or loss of purchased or replacement goods,

or claims of customers of distributor (hereinafter “Purchaser”) for service interruption. The remedies of

the Purchaser set forth herein are exclusive and the liability of Thermal with respect to any contract, or

anything done in connection therewith such as the performance or breach thereof, or from the

manufacture, sale, delivery, resale, or use of any goods covered by or furnished by Thermal whether

arising out of contract, negligence, strict tort, or under any warranty, or otherwise, shall not, except as

expressly provided herein, exceed the price of the goods upon which such liability is based.

THIS WARRANTY BECOMES INVALID IF REPLACEMENT PARTS OR ACCESSORIES ARE USED

WHICH MAY IMPAIR THE SAFETY OR PERFORMANCE OF ANY THERMAL PRODUCT.

THIS WARRANTY IS INVALID IF THE PRODUCT IS SOLD BY NON-AUTHORIZED PERSONS.

The limited warranty periods for Thermal products shall be as follows: A maximum of three (3) years

from date of sale to an authorized distributor and a maximum of two (2) years from date of sale by such

distributor to the Purchaser, and with the following further limitations on such two (2) year period:

PAK UNITS, POWER SUPPLIES PARTS LABOR

MAIN POWER MAGNETICS ....................................... 2 YEARS ..................1 YEAR

ORIGINAL MAIN POWER RECTIFIER ...................... 2 YEARS ..................1 YEAR

CONTROL PC BOARD .................................................. 2 YEARS ..................1 YEAR

ALL OTHER CIRCUITS AND COMPONENTS .......... 1 YEAR ...................1 YEAR

INCLUDING, BUT NOT LIMITED TO, STARTING

CIRCUIT, CONTACTORS, RELAYS, SOLENOIDS,

PUMPS, POWER SWITCHING SEMI-CONDUCTORS

CONSOLES, CONTROL EQUIPMENT, HEAT...................... 1 YEAR ...................1 YEAR

EXCHANGES, AND ACCESSORY EQUIPMENT

TORCH AND LEADS............................................................ 180 DAYS................180 DAYS

REPAIR/REPLACEMENT PARTS ......................................... 90 DAYS..................90 DAYS

Warranty repairs or replacement claims under this limited warranty must be submitted by an

authorized Thermal Arc

repair facility within thirty (30) days of the repair. Authorized Thermal Arc

repair facilities are authorized distributors and authorized Thermal Arc

Service Centers. No

transportation costs of any kind will be paid under this warranty. Transportation charges to send

products to an authorized warranty repair facility shall be the responsibility of the customer. All

returned goods shall be at the customer’s risk and expense. This warranty supersedes all previous

Thermal warranties.

Thermal Arc

is a Registered Trademark of Thermal Dynamics.

Effective January 18, 1991

14 MANUAL 0-2501

GENERAL

2.0 GENERAL

2.01 Description

The Thermal Arc

™

Model LT300 are single or three-phase DC arc welding

power sources with Constant Current (CC) output characteristics.

The LT300 unit is equipped with a built-in Sloper, Pulser, gas control

solenoid, lift arc starter, and a high-frequency arc starter for use with Gas

Tungsten Arc Welding (GTAW), Gas Tungsten Arc Welding-Pulsed

(GTAW-P), Gas Tungsten Arc Welding-Sloped (GTAW-S), Gas Tungsten

Arc Welding-TIG Spot (GTAW-TIG), and Shielded Metal Arc Welding

(SMAW) processes.

19V

3005

AMPS

VOLTS

Arc Characteristics

"CURRENT" Control

310145

Figure 1. LT300 model Volt-Ampere curve

NOTE Volt-Ampere curves show the maximum Voltage and Amperage output

capabilities of the welding power source. Curves of other settings will fall

between the curves shown.

15MANUAL 0-2501

2.02 Functional Block Diagram

Figure 2 illustrates the functional block diagram of the LT300 power supplies.

Main

Circuit

Breaker

DC Power

Supply for

Control Circuit

Voltage Sensor

Drive Circuit

Primary

Current

Sensor

Lift Tig Mode

Output Short

Sensing Circuit

Input

Diode

Output

Diodes

Output

Inductor

Input

Power

Inrush Current

Suppresor

IGBT Inverter

Module

Thermal

Sensor

Output

Transformers

High

Frequency

Unit

Current

Transformer

(CT-1)

Capacitor

Thermal

Sensor

Circuit

Current

Adjustment

Circuit

Reference

Adjustments &

Control Switches

Torch Control

Connection

(CON1)

Control

Transformer

(-c Config.)

Gas

Control

Circuit

–

Trouble

Sensing

Circuit

Sequence

Control

To each control circuit

+12VDC +20VDC

+24VDC +5VDC

Coupling

Coil

Figure 2. LT300 Model functional block diagram

GENERAL

16 MANUAL 0-2501

GENERAL

2.03 Transporting Methods

These units are equipped with a handle for carrying purposes.

WARNING ELECTRIC SHOCK can kill.

• DO NOT TOUCH live electrical parts.

• Disconnect input power conductors from de-energized supply line

before moving welding power source.

WARNING FALLING EQUIPMENT can cause serious personal injury and equipment

damage.

• Lift unit with handle on top of case.

• Use hand cart or similar device of adequate capacity.

• If using a fork lift vehicle, place and secure unit on a proper skid

before transporting.

2.04 Electrical Input Connections

WARNING ELECTRIC SHOCK can kill; SIGNIFICANT DC VOLTAGE is present after

removal of input power.

• DO NOT TOUCH live electrical parts.

• SHUT DOWN welding power source, disconnect input power

employing lockout/tag out procedures. Lockout/tag out procedures

consist of padlocking line disconnect switch in open position,

removing fuses from fuse box, or shutting off and red-tagging

circuit breaker or other disconnecting device.

Electrical Input

Requirements Operate the welding power source from a single or three-phase 50/60 Hz,

AC power supply. The input voltage must match one of the electrical input

voltages shown on the input data label on the unit nameplate. Contact the

local electric utility for information about the type of electrical service

available, how proper connections should be made, and inspection

required.

The line disconnect switch provides a safe and convenient means to

completely remove all electrical power from the welding power supply

whenever necessary to inspect or service the unit.

NOTE These units are equipped with a four-conductor with earth power cable

that is connected at the welding power source end for single or three-

phase electrical input power.

17MANUAL 0-2501

• To operate single-phase, do not connect the RED input conductor.

• Do not connect an input (WHITE, BLACK or RED) conductor to the

ground terminal.

• Do not connect the ground (GREEN) conductor to an input line

terminal.

Refer to figure 3 and:

1. Connect end of ground (GREEN) conductor to a suitable ground. Use

a grounding method that complies with all applicable electrical codes.

2. Connect ends of line 1 (BLACK), line 2 (WHITE) and line 3 (RED)

input conductors to a de-energized line disconnect switch.

3. Use Table 1 below as a guide to select line fuses for the disconnect

switch.

Table 1. Fuse Size Selection

Input Power/Input Voltage Fuse Size (Amperes)

Three-Phase Single-Phase

208-230VAC 60 60

380-415 VAC 30 N/A

460 VAC 25 30

NOTE Fuse size is based on not more than 200 percent of the rated input

amperage of the welding power source (Based on Article 630, National

Electrical Code).

THERMADYNE

OFF ON

208-230V 460V

INPUT SELECT

SWITCH

PRIMARY POWER

PRIMARY CABLE

TURN OFF YOUR MAIN POWER SOURCE AND

CIRCUIT BREAKER OF THIS WELDER BEFORE

MAINTENANCE OR INSPECTION

5A/10V - 400A/36V

400/ 300/

230/

60%

25%

100%

280A

210A 160A

31V

36/ 32/ 28/

28V

26V

208V

3/1

230V

460V

60/80 Hz

61/78A 40/63A

66/70A 37/48A

27/36A 18/24A

28/37A

26/34A

13/17A

21.9/

16.2kVA

14.6/

10.9kVA

10/

8.0kVA

IP 23S

IEC974

400S

Thermal Dynamics

WEST LEBANON, NEW HAMPSHIRE USA 03784

MADE IN JAPAN

Primary Power Cable

Line Fuse

Line

Disconnect

Switch

Welding Power Supply

Ground

Conductor

Ground

Terminal

Figure 3. Electrical input connections

GENERAL

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Thermal Arc Inverter Arc Welder Model LT300 CC/Tig Manuel utilisateur

Marque: Thermal Arc

Modèle: Inverter Arc Welder Model LT300 CC/Tig

Catégorie: Système de soudage

Taper: Manuel utilisateur

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