Thermal Arc Mega-ArcConstant Current Welding Machine Installation guide

Category
Welding System
Type
Installation guide

This manual is also suitable for

Mega-Arc
®
Constant Current
Welding Machine
For the Following Specs:
6031A-3 300 Amp MA-3
6032A-3 300 Amp MA-3
6036A-3 400 Amp MA-4
6036B-3 400 Amp MA-4
6037A-3 400 Amp MA-4
6041A-4 500 Amp MA-5
6042A-3 500 Amp MA-5
6046A-3 750 Amp MA-7
6047A-3 750 Amp MA-7
OWNER’S MANUAL Number 430429-238 (Rev - B)
Revised September 30, 1998
THERMAL ARC INC., TROY, OHIO 45373-1085, U.S.A.
IMPORTANT: Readtheseinstructionsbeforeinstalling, operating, or servicing this system.
INTRODUCTION 1
How To Use This Manual ..................................1-1
Equipment Identification ..................................1-1
Receipt Of Equipment ...................................1-1
SAFETY INSTRUCTIONS AND WARNINGS 2
DESCRIPTION OF EQUIPMENT 3
General ...........................................3-1
Controls And Connections .................................3-1
Welding Current Ranges ..................................3-1
INSTALLATION 4
Location ...........................................4-1
Internal Wiring Check ....................................4-1
Connecting Welding Machine To Line Voltage .......................4-1
Grounding ..........................................4-1
Welding Leads .......................................4-2
OPERATION 5
Sequence Of Operation ...................................5-1
High Frequency Considerations ..............................5-1
MAINTENANCE 6
Lubrication .........................................6-1
Inspection And Cleaning ..................................6-1
TROUBLESHOOTING 7
PARTS LIST 8
Equipment Identification ..................................8-1
How To Use This Parts List .................................8-1
DIAGRAMS
430429-238
Table of Contents
December 1, 1997 Revised
INTRODUCTION
How To Use This Manual
This Owners Manual usually applies to just the
underlined specification or part numbers listed on
the cover. If none are underlined, they are all cov-
ered by this manual.
Throughout this manual, the words WARNING,
CAUTION, and NOTE may appear. Pay particular
attention to the information provided under these
headings. These special annotations are easily rec-
ognized as follows:
WARNING gives information re-
garding possible personal in-
jury. Warnings will be enclosed
in a box such as this.
CAUTION refers to possible equipment
damage. Cautions will be shown in bold
type.
NOTE offers helpful information concern-
ingcertainoperatingprocedures. Noteswill
be shown in italics.
Equipment Identification
The units identification number (specification or
part number), model, and serial number usually
appear on a nameplate attached to the control
panel. In some cases, the nameplate may be at-
tached to the rear panel. Equipment which does not
have a control panel such as gun and cable assem-
blies are identified only by the specification or part
number printed on the shipping container. Record
these numbers for future reference.
Receipt Of Equipment
When you receive the equipment, check it against
the invoice to make sure it is complete and inspect
theequipmentforpossibledamageduetoshipping.
If there is any damage, notify the carrier immedi-
ately to file a claim. Furnish complete information
concerning damage claims or shipping errors to
Thermal Arc, Order Department, 2200 Corporate
Drive, Troy, Ohio 45373-1085. Include all equip-
ment identification numbers as described above
along with a full description of the parts in error.
Move the equipment to the installation site before
uncrating the unit. A lifting eye extends through the
top of the cabinet on most equipment to facilitate
handling with a hoist or crane. Use care to avoid
damaging the equipment when using bars, ham-
mers, etc., to uncrate the unit.
WARNING: Falling machine due
to lifting eye failure may cause
death or serious injury.
Lifting device may fail when overloaded.
This lifting device is designed to lift the
power source ONLY. If the machine is
equipped with a trailer or accessories over
100 pounds, DO NOT LIFT by lifting eyes.
Avoid sudden jerks, drops, or swinging.
Check lifting device components visually
for looseness and signs of metal fatigue.
Before changing any hardware, check
grade and size of bolts, and replace with
bolts of equal or higher size and grade.
Additional copies of this manual may be pur-
chased by contacting Thermal Arc at the address
given above. Include the Owners Manual number
and equipment identification numbers.
430429-238
INTRODUCTION
December 1, 1997 Revised 1-1
PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH. KEEP CHILDREN AWAY. PACEMAKER
WEARERSKEEPAWAY UNTIL CONSULTINGYOURDOCTOR. DO NOTLOSETHESEINSTRUCTIONS.READOPERATING/INSTRUC-
TION MANUAL BEFORE INSTALLING, OPERATING OR SERVICING THIS EQUIPMENT.
Welding products and welding processes can cause serious injury or death, or damage to other equipment or property, if the operator does
not strictly observe all safety rules and take precautionary actions.
Safe practices have developed from past experience in the use of welding and cutting. These practices must be learned through study and
trainingbefore using thisequipment. Anyone not havingextensive trainingin weldingand cutting practices shouldnotattempt to weld.Certain
of the practices apply to equipment connected to power lines; other practices apply to engine driven equipment.
Safe practices are outlined in the American National Standard Z49.1 entitled:
SAFETY IN WELDING AND CUTTING. This publication and
other guides to what you should learn before operating this equipment are listed at the end of these safety precautions.
HAVE ALL INSTALLATION, OPERATION, MAINTENANCE, AND REPAIR WORK PERFORMED ONLY BY QUALIFIED PEOPLE.
ELECTRIC SHOCK can kill.
Touchinglive electrical partscan causefatal shocks
or severe burns. The electrode and work circuit is
electricallylive wheneverthe output ison. Theinput
power circuit and machine internal circuits are also
livewhenpowerison.Insemiautomaticorautomatic
wire welding, the wire, wire reel, drive roll housing,
and all metal parts touching the welding wire are
electrically live. Incorrectly installed or improperly
grounded equipment is a hazard.
1. Do not touch live electrical parts.
2. Wear dry, hole-free insulating gloves and body protection.
3. Insulate yourself fromworkand ground using dryinsulating mats
or covers.
4. Disconnect input power or stop engine before installing or serv-
icing this equipment. Lock input power disconnect switch open,
or remove line fuses so power cannot be turned on accidentally.
5. Properly install and ground this equipment according to its
Owners Manual and national, state, and local codes.
6. Turn off all equipment when not in use. Disconnect power to
equipment if it will be left unattended or out of service.
7. Use fully insulated electrode holders. Never dip holder in water
to coolit or lay it down on the ground or the worksurface. Do not
touch holders connected to two welding machines at the same
time or touch other people with the holder or electrode.
8. Do notuseworn,damaged, undersized,orpoorly splicedcables.
9. Do not wrap cables around your body.
10. Ground the workpiece to a good electrical (earth) ground.
11. Do not touch electrode while in contact with the work (ground)
circuit.
12. Useonlywell-maintainedequipment.Repairorreplacedamaged
parts at once.
13. In confined spaces or damp locations, do not use a welder with
AC output unless it is equipped with a voltage reducer. Use
equipment with DC output.
14. Wear a safety harness to prevent falling if working above floor
level.
15. Keep all panels and covers securely in place.
ARC WELDING SAFETY INSTRUCTIONS AND WARNINGS
ARC RAYS can burn eyes and skin;
NOISE can damage hearing.
Arc rays from the welding process produce intense
heat and strong ultraviolet rays that can burn eyes
and skin. Noise from some processes can damage
hearing.
1. Wear a welding helmet fitted with a proper shade of filter (see
ANSI Z49.1 listed in Safety Standards) to protect your face and
eyes when welding or watching.
2. Wear approved safety glasses. Side shields recommended.
3. Use protective screens or barriers to protect others from flash
and glare; warn others not to watch the arc.
4. Wear protective clothing made from durable, flame-resistant
material (wool and leather) and foot protection.
5. Use approved ear plugs or ear muffs if noise level is high.
ARC WELDING can be hazardous.
Eye protection filter shade selector for welding or cutting (goggles or helmet), from AWS A6.2-73.
Welding or Cutting
Operation
Torch soldering
Torch brazing
Oxygen cutting
Light
Medium
Heavy
Gas welding
Light
Medium
Heavy
Shielded metal-arc welding
(stick) electrodes
Welding or Cutting
Operation
Gas metal-arc welding (MIG)
Non-ferrous base metal
Ferrous base metal
Gastungstenarc welding(TIG)
Atomic hydrogen welding
Carbon arc welding
Plasma arc welding
Carbon arc air gouging
Light
Heavy
Plasma arc cutting
Light
Medium
Heavy
Electrode Size
Metal Thickness
or Welding Current
Under 1 in., 25 mm
1 to 6 in., 25-150 mm
Over 6 in., 150 mm
Under 1/8 in., 3 mm
1/8 to 1/2 in., 3-12 mm
Over 1/2 in., 12 mm
Under 5/32 in., 4 mm
5/32 to 1/4 in., 4 to 6.4 mm
Over 1/4 in., 6.4 mm
Electrode Size
Metal Thickness
or Welding Current
All
All
All
All
All
All
Under 300 Amp
300 to 400 Amp
Over 400 Amp
Filter
Shade
No.
2
3or4
3or4
4or5
5or6
4or5
5or6
6or8
10
12
14
Filter
Shade
No.
11
12
12
12
12
12
12
14
9
12
14
ARC WELDING SAFETY INSTRUCTIONS AND WARNINGS
Instruction 830001
May 8, 1996 2-1
WELDING can cause fire or explosion.
Sparks and spatter fly off from the welding arc. The
flying sparks and hot metal, weld spatter, hot work-
piece, and hot equipment cancause fires and burns.
Accidental contact of electrode or welding wire to
metal objects can cause sparks, overheating, or fire.
1. Protect yourself and others from flying sparks and hot metal.
2. Do not weld where flying sparks can strike flammable material.
3. Remove all flammables within 35 ft (10.7 m) of the welding arc.
If this is not possible, tightly cover them with approved covers.
4. Be alert that welding sparks and hot materials from welding can
easily go through small cracks and openings to adjacent areas.
5. Watch for fire, and keep a fire extinguisher nearby.
6. Be aware that welding on a ceiling, floor, bulkhead, or partition
can cause fire on the hidden side.
7. Do not weld on closed containers such as tanks or drums.
8. Connect work cable to the work as close to the welding area as
practical to prevent welding current from traveling long, possibly
unknown paths and causing electric shock and fire hazards.
9. Do not use welder to thaw frozen pipes.
10. Remove stick electrode from holder or cut off welding wire at
contact tip when not in use.
11. Wear oil-free protective garments such as leather gloves, heavy
shirt, cuffless trousers, high shoes, and a cap.
FLYING SPARKS AND HOT METAL can
cause injury.
Chipping and grinding cause flying metal. As welds
cool, they can throw off slag.
1. Wear approved face shield or safety goggles. Side shields rec-
ommended.
2. Wear proper body protection to protect skin.
CYLINDERS can explode if damaged.
Shielding gas cylinders contain gas under highpres-
sure. If damaged, a cylinder can explode. Since gas
cylinders are normally part of the welding process,
be sure to treat them carefully.
1. Protectcompressedgascylindersfromexcessiveheat,mechani-
cal shocks, and arcs.
2. Install and secure cylinders in an upright position by chaining
themtoastationarysupportorequipmentcylinderracktoprevent
falling or tipping.
3. Keep cylinders awayfrom any welding orother electricalcircuits.
4. Never allow a welding electrode to touch any cylinder.
5. Use only correct shielding gas cylinders, regulators, hoses, and
fittings designed for the specific application; maintain them and
associated parts in good condition.
6. Turn face away from valve outlet when opening cylinder valve.
7. Keep protective cap in place over valve except when cylinder is
in use or connected for use.
8. Readand follow instructions on compressed gas cylinders, asso-
ciated equipment, and CGA publication P-1 listed in Safety
Standards.
ENGINES can be hazardous.
ENGINE EXHAUST GASES can kill.
Engines produce harmful exhaust gases.
1. Use equipment outside in open, well-ventilated areas.
2. If used in a closed area, vent engine exhaust outside and away
from any building air intakes.
FUMES AND GASES can be hazardous
to your health.
Weldingproducesfumesandgases.Breathingthese
fumes and gases can be hazardous to your health.
1. Keep your head out of the fumes. Do not breath the fumes.
2. If inside, ventilate the area and/or use exhaust at the arc to
remove welding fumes and gases.
3. If ventilation is poor, use an approved air-supplied respirator.
4. Read the Material Safety Data Sheets (MSDSs) and the manu-
facturers instruction for metals, consumables, coatings, and
cleaners.
5. Work in a confined space only if it is well ventilated, or while
wearing an air-supplied respirator. Shielding gases used for
welding can displace air causing injury or death. Be sure the
breathing air is safe.
6. Do not weld in locations near degreasing, cleaning, or spraying
operations. The heat and raysof the arc canreact with vaporsto
form highly toxic and irritating gases.
7. Do not weld on coated metals, such as galvanized, lead, or
cadmium plated steel, unless the coating is removed from the
weld area, the area is well ventilated, and if necessary, while
wearing an air-supplied respirator. The coatings and any metals
containing these elements can give off toxic fumes if welded.
ARC WELDING SAFETY INSTRUCTIONS AND WARNINGS
Instruction 830001
2-2 May 8, 1996
STEAM AND PRESSURIZED HOT
COOLANT can burn face, eyes, and
skin.
The coolant inthe radiatorcan bevery hot andunder
pressure.
1. Do not remove radiator cap when engine is hot. Allow engine to
cool.
2. Wear gloves and put a rag over cap area when removing cap.
3. Allow pressure to escape before completely removing cap.
PRINCIPAL SAFETY STANDARDS
Safety inWelding andCutting, ANSIStandard Z49.1,fromAmerican
Welding Society, 550 N.W. LeJeune Rd., Miami, FL 33126.
Safetyand Health Standards, OSHA29 CFR 1910,from Superinten-
dent of Documents, U.S. Government Printing Office, Washington,
D.C. 20402.
Recommended Safe Practices for the Preparation for Welding and
CuttingofContainersThatHaveHeldHazardousSubstances,Ameri-
can Welding Society Standard AWS F4.1, from American Welding
Society, 550 N.W. LeJeune Rd., Miami, FL 33126.
National Electrical Code, NFPA Standard 70, from National Fire
Protection Association, Batterymarch Park, Quincy, MA 02269.
Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet
P-1, from Compressed Gas Association, 1235 Jefferson DavisHigh-
way, Suite 501, Arlington, VA 22202.
Code forSafety inWelding andCutting, CSAStandardW117.2, from
Canadian Standards Association, Standards Sales, 178 Rexdale
Boulevard, Rexdale, Ontario, Canada M9W 1R3.
Safe Practices for Occupation and Educational Eye and Face Pro-
tection, ANSI Standard Z87.1, from American National Standards
Institute, 1430 Broadway, New York, NY 10018.
Cutting and Welding Processes, NFPA Standard 51B, from National
Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
SPARKS can cause BATTERY GASES
TO EXPLODE; BATTERY ACID can
burn eyes and skin.
Batteriescontainacidandgenerateexplosivegases.
1. Always wear a face shield when working on a battery.
2. Stop engine before disconnecting or connecting battery cables.
3. Do not allow tools to cause sparks when working on a battery.
4. Do not use welder to charge batteries or jump start vehicles.
5. Observe correct polarity (+ and ) on batteries.
MOVING PARTS can cause injury.
Moving parts,such as fans,rotors, and beltscan cut
fingers and hands and catch loose clothing.
1. Keep all doors, panels, covers, and guards closed and securely
in place.
2. Stop engine before installing or connecting unit.
3. Have only qualified people remove guards or covers for mainte-
nance and troubleshooting as necessary.
4. To preventaccidentalstarting during servicing,disconnectnega-
tive (-) battery cable from battery.
5. Keep hands, hair, loose clothing, and tools away from moving
parts.
6. Reinstall panels or guards and close doors when servicing is
finished and before starting engine.
ENGINE FUEL can cause fire or
explosion.
Engine fuel is highly flammable.
1. Stop engine before checking or adding fuel.
2. Do notaddfuelwhile smokingor ifunit isnear anysparksor open
flames.
3. Allow engine to cool before fueling. If possible, check and add
fuel to cold engine before beginning job.
4. Do not overfill tank allow room for fuel to expand.
5. Do not spill fuel. If fuel is spilled, clean up before starting engine.
NOTE: Considerations About Welding And The Effects Of Low Frequency Electric And Magnetic Fields
The following is a quotation from the General Conclusions Section of the U.S. Congress, Office of Technology Assessment,
Biological Effects
of Power Frequency Electric & Magnetic Fields Background Paper, OTA-BP-E-63 (Washington, DC: U.S. Government Printing Office, May
1989): ... there is now a very large volume of scientific findings based on experiments at the cellular level and from studies with animals and
people which clearly establish that low frequency magnetic fields can interact with, and produce changes in, biological systems. While most of
this work is of very high quality, the results are complex. Current scientific understanding does not yet allow us to interpret the evidence in a
single coherent framework. Even more frustrating, it does not yet allow us to draw definite conclusions about questions of possible risk or to
offer clear science-based advice on strategies to minimize or avoid potential risks.
To reduce magnetic fields in the workplace, use the following procedures:
About Pacemakers:
The above procedures are among those also normally recommended for pacemaker wearers. Consult your doctor for complete information.
1. Keep cables close together by twisting or taping them.
2. Arrange cables to one side and away from the operator.
3. Do not coil or drape cables around the body.
4. Keep welding power source and cables as far away from body as
practical.
WARNING: This product, when used for welding or cutting, produces fumes or gases which contain chemicals known to the State
of California to cause birth defects and, in some cases, cancer. (California Health & Safety Code Sec. 25249.5 et seq.)
ARC WELDING SAFETY INSTRUCTIONS AND WARNINGS
Instruction 830001
May 8, 1996 2-3
This page intentionally left blank.
ARC WELDING SAFETY INSTRUCTIONS AND WARNINGS
Instruction 830001
2-4 May 8, 1996
PROTEGEZ-VOUS, AINSI QUE LES AUTRES, CONTRE LES BLESSURES GRAVES POSSIBLES OU LA MORT. NE LAISSEZ PAS LES
ENFANTSSAPPROCHER,NI LESPORTEURSDESTIMULATEURCARDIAQUE (A MOINS QUILSNAIENTCONSULTEUN MEDECIN).
CONSERVEZ CES INSTRUCTIONS. LISEZ LE MANUEL DOPERATION OU LES INSTRUCTIONS AVANT DINSTALLER, UTILISER OU
ENTRETENIR CET EQUIPEMENT.
Les produits et procédés de soudage peuvent sauser des blessures graves ou la mort, de même que des dommages au reste du matériel
et à la propriété,silutilisateur nadhère pas strictement à toutes les règles de sécurité et ne prend pas les précautions nécessaires.
En soudage et coupage, des pratiques sécuritaires se sont développées suite à lexpérience passée. Ces pratiques doivent être apprises
parétude ou entraînement avant dutiliserlequipement. Toute personne nayant pas suivi unentraînement intensif en soudage et coupage
ne devrait pas tenter de souder. Certaines pratiques concernent les équipements raccordés aux lignes dalimentation alors que dautres
sadressent aux groupes électrogènes.
La norme Z49.1 de lAmerican National Standard, intitulée SAFETY IN WELDING AND CUTTING présente les pratiques sécuritaires à
suivre. Ce document ainsi que dautres guides que vous devriez connaître avant dutiliser cet équipement sont présentés à la fin de ces
instructions de sécurité.
SEULES DES PERSONNES QUALIFIEES DOIVENT FAIRE DES TRAVAUX DINSTALLATION, DE REPARATION, DENTRETIEN ET
DESSAI.
LELECTROCUTION PEUT ETRE
MORTELLE.
Une décharge électrique peut tuer ou brûler grave-
ment. L’électrode et le circuit de soudage sont sous
tension dès la mise en circuit. Le circuit dalimenta-
tion et les circuits internes de l’équipement sont
aussi sous tension dès la mise en marche. En
soudage automatique ou semi-automatique avec
fil, ce dernier, le rouleau ou la bobine de fil, le
logement des galets dentrainement et toutes les
pièces métalliques en contact avec le fil de soudage
sont sous tension. Un équipement inadéquatement
installé ou inadéquatement mis à la terre est dangereux.
1. Ne touchez pas à des pièces sous tension.
2. Portez des gants et des vêtements isolants, secs et non troués.
3. Isolez-vousde lapièceà souderetdelamiseà laterreaumoyen
de tapis isolants ou autres.
4. Déconnectez la prise dalimentation de l’équipement ou arrêtez
le moteur avant de linstaller ou den faire lentretien. Bloquez le
commutateurencircuitouvertou enlevezlesfusiblesdelalimen-
tation afin d’éviter une mise en marche accidentelle.
5. Veuillez à installer cet équipement et à le mettre à la terre selon
le manuel dutilisation et les codes nationaux, provinciaux et
locaux applicables.
6. Arrêtez tout équipement après usage. Coupez lalimentation de
l’équipement sil est hors dusage ou inutilisé.
7. Nutilisezquedesporte-électrodesbienisolés.Nejamaisplonger
les porte-électrodes dans leau pour les refroidir. Ne jamais les
laisser traîner par terre ou sur les pièces à souder. Ne touchez
pas aux porte-électrodes raccordés à deux sources de courant
en même temps. Ne jamais toucher quelquun dautre avec
l’électrode ou le porte-électrode.
8. Nutilisez pas de câbles électriques usés, endommagés, mal
épissés ou de section trop petite.
9. Nenroulez pas de câbles électriques autour de votre corps.
10. Nutilisez quune bonne prise de masse pour la mise à la terre
de la pièce à souder.
11. Ne touchez pas à l’électrode lorsquen contact avec le circuit de
soudage (terre).
12. Nutilisez que des équipements en bon état. Réparez ou rem-
placez aussitôt les pièces endommagées.
13. Dans des espacesconfinés ou mouillés, nutilisez pasdesource
de courant alternatif, à moins quil soit muni dun réducteur de
tension. Utilisez plutôt une source de courant continu.
14. Portez un harnais de sécurité si vous travaillez en hauteur.
15. Fermez solidement tous les panneaux et les capots.
PRECAUTIONS DE SECURITE EN SOUDAGE A L
ARC
LE SOUDAGE A LARC EST DANGEREUX
LE RAYONNEMENT DE LARC PEUT
BRÛLER LES YEUX ET LA PEAU; LE
BRUIT PEUT ENDOMMAGER LOUIE.
Larc de soudage produit une chaleur et des
rayons ultraviolets intenses, susceptibles de
brûler les yeux et la peau. Le bruit causé par
certains procédés peut endommager louïe.
1. Portez une casque de soudeur avec filtre oculaire de nuance
appropriée (consultez la norme ANSI Z49 indiquéeci-après)
pourvousprotéger le visage etles yeux lorsquevous soudezou
que vous observez lexécution dune soudure.
2. Portez deslunettesdesécurité approuvées.Desécranslatéraux
sont recommandés.
3. Entourez laire de soudage de rideaux ou de cloisons pour
protéger les autres des coups darcoudel’éblouissement;
avertissez les observateurs de ne pas regarder larc.
4. Portez des vêtements en matériaux ignifuges et durables (laine
et cuir) et des chaussures de sécurité.
5. Portez un casque antibruit ou des bouchons doreille approuvés
lorsque le niveau de bruit est élevé.
PRECAUTIONS DE SECURITE EN SOUDAGE A L'ARC
Instruction 830002
8-V-96 2-1
SELECTION DES NUANCES DE FILTRES OCULAIRES POUR LA PROTECTION DES YEUX EN COUPAGE ET SOUDAGE
( selon AWS A 8.2-73 )
Opération
de
Coupage ou soudage
Brasage tendre au chalumeau
Brasage fort au chalumeau
Oxycoupage
mince
moyen
épais
Soudage aux gaz
mince
moyen
épais
Soudage à larc avec
electrode enrobées (SMAW)
Soudage à larc sous gaz
avec fil plein (GMAW)
métaux non-ferreux
métaux ferreux
Soudage à larc sous gaz
avec électrode de tungstène (GTAW)
Soudage à lhydrogène
atomique (AHW)
Soudage à larc avec
électrode de carbone (CAW)
Soudage à larc Plasma (PAW)
Gougeage Air-Arc avec
électrode de carbone
mince
épais
Coupage à larc Plasma (PAC)
mince
moyen
épais
Dimension d’électrode ou
Epaisseur de métal ou
Intensité de courant
toutes conditions
toutes conditions
moins de 1 po. (25 mm)
de 1 à 6 po. (25 à 150 mm)
plus de 6 po. (150 mm)
moins de 1/8 po. (3 mm)
de 1/8 à 1/2 po. (3 à 12 mm)
plus de 1/2 po. (12 mm)
moins de 5/32 po. (4 mm)
de 5/32 à 1/4 po. (4 à 6.4 mm)
plus de 1/4 po. (6.4 mm)
toutes conditions
toutes conditions
toutes conditions
toutes conditions
toutes conditions
toutes dimensions
moins de 300 ampères
de 300 à 400 ampères
plus de 400 ampères
Nuance de
de filtre
oculaire
2
3 ou 4
2 ou 3
4 ou 5
5 ou 6
4 ou 5
5 ou 6
6 ou 8
10
12
14
11
12
12
12
12
12
12
14
9
12
14
LES VAPEURS ET LES FUMEES SONT
DANGEREUSES POUR LA SANTE.
Le soudage dégage des vapeurs et des fumées
dangereuses à respirer.
1. Eloignez la tête des fumées pour éviter de les respirer.
2. A lintérieur, assurez-vous que laire de soudage est bien ven-
tilée ou que les fumées et les vapeurs sont aspirées à larc.
3. Si la ventilation est inadequate, portez un respirateur à adduc-
tion dair approuvé.
4. Lisez les fiches signalétiques et les consignes du fabricant
relatives aux métaux, aux produits consummables, aux revête-
ments et aux produits nettoyants.
5. Ne travaillez dans un espace confiné que sil est bien ventilé;
sinon, portez un respirateur à adduction dair. Les gaz protec-
teurs de soudage peuvent déplacer loxygène de lair et ainsi
causer des malaises ou la mort. Assurez-vous que lair est
propre à la respiration.
6. Ne soudez pas à proximité dopérations de dégraissage, de
nettoyage ou de pulvérisation. La chaleur et les rayons de larc
peuvent réagir avec des vapeurs et former des gaz hautement
toxiques et irritants.
7. Ne soudez des tôles galvanisées ou plaquées au plomb ou au
cadmium que siles zones à souderont été grattées à fond, que
si lespace est bien ventilé;sinécessaire portez un respirateur
à adduction dair.Car cesrevêtementset tout métalquicontient
cesélémentspeuventdégagerdesfuméestoxiquesaumoment
du soudage.
PRECAUTIONS DE SECURITE EN SOUDAGE A L'ARC
Instruction 830002
2-2 8-V-96
LE SOUDAGE PEUT CAUSER UN IN-
CENDIE OU UNE EXPLOSION
Larc produit des étincellies et des projections. Les
particules volantes, le métal chaud, les projections
de soudure et l’équipement surchauffé peuvent
causer un incendie et des brûlures. Le contact
accidentel de l’électrode ou du fil-électrode avecun
objet métallique peut provoquer des étincelles, un échauffement
ou un incendie.
1. Protégez-vous, ainsi que les autres, contre les étincelles et du
métal chaud.
2. Ne soudez pas dans un endroit où des particules volantes ou
des projections peuvent atteindre des matériaux inflammables.
3. Enlevez toutes matières inflammables dans un rayon de 10, 7
mètres autour de larc, ou couvrez-lessoigneusement avec des
bâches approuvées.
4. Méfiez-vous des projections brulantesde soudagesusceptibles
de pénétrerdans des aires adjacentespar depetites ouvertures
ou fissures.
5. Méfiez-vous des incendies et gardez un extincteur à portéede
la main.
6. Noubliez pas quune soudure réalisée sur un plafond, un
plancher, une cloison ou une paroi peut enflammer lautre côté.
7. Ne soudez pas un récipient fermé, tel un réservoir ou un baril.
8. Connectez le câblede soudage leplus prèspossiblede lazone
de soudage pour empêcher le courant de suivre un long par-
cours inconnu, et prévenir ainsi les risques d’électrocution et
dincendie.
9. Ne dégelez pas les tuyaux avec un source de courant.
10. Otez l’électrode du porte-électrode ou coupezle filau tube-con-
tact lorsquinutilisé après le soudage.
11. Portez des vêtements protecteurs non huileux, tels des gants
en cuir, une chemise épaisse, un pantalon revers, des bottines
de sécurité et un casque.
LES ETINCELLES ET LES PROJEC-
TIONS BRULANTES PEUVENT
CAUSER DES BLESSURES.
Le piquage et le meulage produisent des particules métalliques
volantes. En refroidissant, la soudure peut projeter du éclats de
laitier.
1. Portez un écran facial ou des lunettes protectrices approuvées.
Des écrans latéraux sont recommandés.
2. Portez des vêtements appropriés pour protéger la peau.
LES BOUTEILLES ENDOMMAGEES
PEUVENT EXPLOSER
Les bouteilles contiennent des gaz protecteurs
sous hautepression. Desbouteilles endommagées
peuvent exploser. Comme les bouteilles font nor-
malement partie du procédé de soudage, traitez-
les avec soin.
1. Protégez les bouteilles de gaz comprimé contre les sources de
chaleur intense, les chocs et les arcs de soudage.
2. Enchainez verticalement les bouteilles à un support ou à un
cadre fixe pour les empêcher de tomber ou d’être renversées.
3. Eloignez les bouteilles de tout circuit électrique ou de tout
soudage.
4. Empêchez tout contact entre une bouteille et une électrode de
soudage.
5. Nutilisez que des bouteilles de gaz protecteur, des détendeurs,
des boyauxs et des raccords conçus pour chaque application
spécifique; ces équipements et les pièces connexes doivent
être maintenus en bon état.
6. Ne placez pas le visage face à louverture du robinet de la
bouteille lors de son ouverture.
7. Laissez en place le chapeau de bouteille sauf si en utilisation
ou lorsque raccordé pour utilisation.
8. Lisez et respectez les consignes relatives aux bouteilles de gaz
comprimé et aux équipements connexes, ainsi que la publica-
tion P-1 de la CGA, identifiée dans la liste de documents
ci-dessous.
LES GAZ DECHAPPEMENT DES
MOTEURS PEUVENT ETRE MORTELS.
Les moteurs produisent des gaz d’échappement
nocifs.
1. Utilisez l’équipement à lextérieur dans des aires ouvertes et
bien ventilées.
2. Si vous utilisez ces équipements dans un endroit confiné, les
fumées d’échappement doivent être envoyées à lextérieur, loin
des prises dair du bâtiment.
LES MOTEURS PEUVENT ETRE DANGEREUX
LE CARBURANT PEUR CAUSER UN IN-
CENDIE OU UNE EXPLOSION.
Le carburant est hautement inflammable.
1. Arrêtez le moteur avant de vérifier le niveau de
carburant ou de faire le plein.
2. Ne faites pas le plein en fumant ou proche dune source
d’étincelles ou dune flamme nue.
3. Si cest possible, laissez le moteur refroidir avant de faire le
plein de carburant ou den vérifier le niveau au début du
soudage.
4. Ne faites pas le plein de carburant à ras bord: prévoyez de
lespace pour son expansion.
5. Faites attentionde nepas renverser decarburant.Nettoyez tout
carburant renversé avant de faire démarrer le moteur.
PRECAUTIONS DE SECURITE EN SOUDAGE A L'ARC
Instruction 830002
8-V-96 2-3
DES PIECES EN MOUVEMENT PEU-
VENT CAUSER DES BLESSURES.
Despiècesen mouvement,telsdesventilateurs,des
rotors et des courroies peuvent couper doigts et
mains, ou accrocher des vêtements amples.
1. Assurez-vous que les portes, les panneaux, les capots et les
protecteurs soient bien fermés.
2. Avant dinstaller ou de connecter un système,arrêtez le moteur.
3. Seules des personnes qualifiées doivent démonter des protec-
teurs ou des capots pour faire lentretien ou le dépannage
nécessaire.
4. Pour empêcher un démarrage accidentel pendant lentretien,
débranchez le câble daccumulateur à la borne négative.
5. Napprochez pas les mains ou les cheveux de pièces en mou-
vement; elles peuvent aussi accrocher des vêtements amples
et des outils.
6. Réinstallez les capots ou les protecteurs et fermez les portes
après des travaux dentretien et avant de faire démarrer le
moteur.
DESETINCELLESPEUVENT FAIREEX-
PLOSER UN ACCUMULATEUR;
LELECTROLYTE DUN ACCUMU-
LATEUR PEUT BRULER LA PEAU ET
LES YEUX.
Les accumulateurs contiennent de l’électrolyte
acide et dégagent des vapeurs explosives.
1. Portez toujours un écran facial en travaillant sur un accumu-
lateur.
2. Arrêtez le moteur avant de connecter ou de déconnecter des
câbles daccumulateur.
3. Nutilisez que des outils anti-étincelles pour travailler sur un
accumulateur.
4. Nutilisez pas une source de courant de soudage pour charger
un accumulateur ou survolter momentanément un véhicule.
5. Utilisez la polarité correcte (+ et ) de laccumulateur.
LA VAPEUR ET LE LIQUIDE DE RE-
FROIDISSEMENT BRULANT SOUS
PRESSION PEUVENT BRULER LA
PEAU ET LES YEUX.
Le liquide de refroidissement dun radiateur peut
être brûlant et sous pression.
1. N’ôtez pas le bouchon de radiateur tant que le moteur nest pas
refroidi.
2. Mettez desgants etposez un torchonsur le bouchonpour l’ôter.
3. Laissez la pression s’échapper avant d’ôter complètement le
bouchon.
PRINCIPALES NORMES DE SECURITE
SafetyinWeldingandCutting,normeANSIZ49.1,AmericanWelding
Society, 550 N.W. LeJeune Rd., Miami, FL 33128.
Safety and Health Standards, OSHA 29 CFR 1910, Superintendent
of Documents, U.S. Government Printing Office, Washington, D.C.
20402.
Recommended Safe Practices for the Preparation for Welding and
CuttingofContainersThatHaveHeldHazardousSubstances,norme
AWS F4.1, American Welding Society, 550 N.W. LeJeune Rd.,
Miami, FL 33128.
National Electrical Code, norme 70 NFPA, National Fire Protection
Association, Batterymarch Park, Quincy, MA 02269.
Safe Handling of Compressed Gases in Cylinders, document P-1,
Compressed Gas Association, 1235 Jefferson DavisHighway, Suite
501, Arlington, VA 22202.
Code for Safety in Welding and Cutting, norme CSA W117.2 Asso-
ciation canadienne de normalisation, Standards Sales, 276 Rexdale
Boulevard, Rexdale, Ontario, Canada M9W 1R3.
Safe Practices for Occupation and Educational Eye and Face Pro-
tection, norme ANSI Z87.1, American National Standards Institute,
1430 Broadway, New York, NY 10018.
Cutting and Welding Processes, norme 51B NFPA, National Fire
Protection Association, Batterymarch Park, Quincy, MA 02269.
PRECAUTIONS DE SECURITE EN SOUDAGE A L'ARC
Instruction 830002
2-4 8-V-96
DESCRIPTION OF EQUIPMENT
General
The Mega-Arc
®
welding machines are constant-
current transformer type DC units that provide volt-
ampere curves that are basically drooping, with a
slight slope.
See Table 3-1 for rated output of the models
covered by this manual.
Controls And Connections
INPUT CONTACTOR ONPilot Light Indicates
when the contactor is closed for power ON modeof
the unit.
INPUTCONTACTOR CONTROL ON/OFFSwitch
This toggle switch is the master power switch for
the welding machine, and must be in the ON posi-
tion before any other section will operate. The pri-
mary circuit of the control transformer is energized
whenever line voltage is present at the input termi-
nals. This switch closes the secondary circuit of the
control transformer, energizing the contactor,which
energizes the power transformer. See DANGER in
Safety Warning chapter included in this manual.
REMOTE AMPERAGE CONTROL LOCAL-RE-
MOTE Switch Selects either the LOCAL (panel
mounted) current control, or some remote control
device to control welding current.
REMOTECONTACTOR CONTROL LOCAL-RE-
MOTE Switch In LOCAL (DOWN) position, the
SCRs (Silicon Controlled Rectifiers) are energized,
andopen-circuitvoltage(OCV)isappliedtowelding
output terminals. In REMOTE (UP) position, a re-
mote switch must be used.
RANGE SWITCH, LOW/HIGH Range The weld-
ing current range suitable for the work application
and electrode selection will be chosen by this
switch. See Table 3-2 for current ranges.
ARC FORCE AMPERE CONTROL Varies the
short-circuit (welding arc) current and produces an
increaseofamperagewhenarclengthisshortened,
suchasinatightgroove.Thiscontrolprovidesmore
arcforceandeliminatesthetendencyofsnuffingout
the arc, when using electrode manipulation. The
control is especially suited for use with E-6010 and
E-7018 electrodes for pipe welding applications.
See NOTE at paragraph 5 in OPERATION chapter.
CURRENT CONTROL Adjusts the welding cur-
rent. See Table 3-2 for ranges of control.
VOLTMETER (Optional) Indicates the OCV or
welding voltage of the arc, if welding arc is estab-
lished.
AMMETER (Optional) Indicates the amperage
of the welding arc, when an arc is established.
POSITIVE TERMINAL (+) Serves as connection
point for the welding lead to the workpiece when
straight polarity is used.
NEGATIVE TERMINAL () Serves as connec-
tion point for the electrode lead when straight polar-
ity is used.
REMOTE CONTROL RECEPTACLE Serves as
connection point for the Remote Control Pendant.
FUSE - 3 A
Welding Current Ranges
Model Range 1 (Low) Range 2 (High)
MA-3
MA-4
MA-5
MA-7
10 TO 120 A
15 TO 185 A
20 TO 240 A
30 TO 350 A
20 TO 300 A
30 TO 400 A
40 TO 500 A
60 TO 750 A
Table 3-2
Spec
No Amps
Load
Volts
No
Load
Volts kW
Duty
Cycle
Model No. MA-3
6031A-36
032A-3
300
300
32
32
80
80
9.6
9.6
35%
35%
Model No. MA-4
6036A-3
6036B-3
6037A-3
400
400
400
32
32
32
80
80
80
12.8
12.8
12.8
35%
35%
35%
Model No. MA-5
6041A-4
6042A-3
500
500
40
40
85
95
14.4
14.4
40%
40%
Model No. MA-7
6046A-3
6047A-3
750
750
44
44
85
85
33
33
40%
40%
Table 3-1
430429-238
DESCRIPTION OF EQUIPMENT
December 1, 1997 Revised 3-1
Figure 3-1 Control Panel
430429-238
DESCRIPTION OF EQUIPMENT
3-2 December 1, 1997 Revised
INSTALLATION
Location
For best operating characteristics and longest unit
life, take care in selecting an installation site. Avoid
locations exposed to high humidity, dust, high am-
bienttemperature,orcorrosivefumes.Moisturecan
condense on electrical components, causing corro-
sionorshortingofcircuits.Dirtoncomponentshelps
retain this moisture.
Adequate air circulation is needed at all times in
order to assure proper operation. Provide a mini-
mumof 12inches (305 mm)of freeairspaceat both
front and rear of the unit. Make sure that the venti-
lator openings are not obstructed.
Internal Wiring Check
Refer to the product identification plate (name-
plate) on the welding machines control panel to
determine the power input voltages and frequency
at which it will be operated.
Removecabinettopfor accesstoLINEVOLTAGE
CHANGEOVER circuitry. Check line voltage con-
nections against instructions on VOLTAGE
CHANGEOVER DIAGRAM supplied with this man-
ual. If necessary, rearrange internal wiring and/or
link connections.
Connecting Welding Machine To
Line Voltage
The input power should be connected to the unit
through a fused disconnect switch, or other suitable
disconnecting means furnished by the user. A hole
is provided inthe rear panel of the machine, near to
the input connections, for the entry of the input
conductors.
DANGER: ELECTRIC SHOCK
CAN KILL. Open the discon-
nect switch, or breaker, and
determine that no voltage is
present, before connecting
wires between welding ma-
chine and power supply.
CAUTION: The method of installation,
conductor size, and overcurrent protec-
tion shall conform to the requirements
of the local electrical code, the National
ElectricalCode, or other national codes,
as applicable. All installationwiring and
machine reconnection shall be done by
qualified persons.
Table 4-2 provides minimal information for selec-
tion of line conductors, fuses, and the equipment
grounding conductor. This information is from the
National Electrical Code NFPA 70-1981 Edition.
Install this equipment per the latest edition, avail-
able from the National Fire Protection Association,
470AtlanticAvenue,Boston,MA 02210.SeeCAU-
TION above.
Connect the three-phase line leads to terminals
L1, L2, and L3 on the line contactor inside the
welding machine cabinet.
Grounding
The frame of this welding machine should be
grounded for personnel safety, and to assure op-
erationoftheovercurrentprotection.Thegrounding
method, and the equipment grounding conductor
Spec. No. Line volts Line Amps Phase Hz kW
6031A-3
6032A-3
6036A-3
6036B-3
6037A-3
6041A-4
6042A-3
6046A-3
6047A-3
220/380/415
380/500
220/380/415
220/380/415
380/500
220/380/415
380/500
220/380/415
380/500
64.5/37.5/34.5
37.5/28.5
84/48/44
84/48/44
48/36.5
114/66/60
66/50
172/100/91
100/76
3
3
3
3
3
3
3
3
3
50/60
50/60
50/60
50/60
50/60
50/60
50/60
50/60
50/60
14.3
14.3
18.5
18.5
18.5
24.9
24.9
38
38
Table 4-1 Input Voltage Data
430429-238
INSTALLATION
December 1, 1997 Revised 4-1
size and type shall conform to local and national
codes.
For the National Electrical Code, the equipment
grounding conductor shall be green, green with a
yellow stripe, or bare.
If flexible power cable is used, use a cable assem-
bly which includes the equipment grounding con-
ductor. If metallic armored cable or conduit is used,
the metal sheathing or conduit must be effectively
grounded per local and national codes.
Rubber-tiremountedequipmentshallbegrounded
to conform to localand national codes. The ground-
ing assists in providing protection against line volt-
age electrical shock and static shock. The
grounding serves to discharge the static electric
charge which tends to build up on rubber-tire
mounted equipment. This static charge can cause
painful shock and lead to the erroneous conclusion
that an electrical fault exists in the equipment.
If a system ground is not available, consult the
electrical code enforcement body for instructions.
The welding machine should be connected to an
adequate driven ground rod, or to a water pipe that
entersthe ground not more than10feet(30 meters)
from the machine.
The equipment grounding conductor size is listed
in Table 4-2 as a guide, if no local or national code
is applicable.
Attach the equipment grounding conductor to the
stud provided adjacent to the contactor. Determine
that the ground wire size is adequate before the
machine is operated.
Caution: Be sure to replace the cabinet
top to assure adequate internal ventila-
tion and prevent component failure.
Welding Leads
Use Table 4-3 for selection of the proper size
copper welding leads.
** 35% duty cycle
*** 40% duty cycle
6031A-3
6032A-3
••6036A-3
6036B-3
6037A-3
6041A-4
6042A-3
◊◊ 6046A-3
6047A-3
* Conductor size shall be modified as required for line voltage drop and ambient temperature. Sizes listed for
conduit installation are based on 90°C conductor insulation, designated as FEP, FEPB, RHH, and THHN.
Line
Volts Full Load amps
Approx. Line
Fuse Rating
Copper Line Wire Size* Copper Grd.
Conductor - Min.
In Conduit Flexible Cable
220
380
415
500
3
••
4
5
◊◊
73457
**
3
**
4
***
5
***
7
**
3
**
4
***
5
***
7
**
3
**
4
***
5
***
7
64.5
37.5
34.5
28.5
84
48
44
36.5
114
66
60
50
172
100
91
76
90
50
50
40
125
70
70
50
150
90
90
70
225
150
125
110
#8
#8
#8
#8
#6
#8
#8
#8
#4
#8
#8
#8
#2
#6
#6
#6
# 8
# 8
# 8
#10
#8
#8
#8
#8
#8
#8
#8
#8
#4
#8
#10
#10
#10
#10
#8
#10
#10
#10
#6
#8
#8
#10
#6
#8
#8
#8
Table 4-2 Recommended Wire and Fuse Size Table
430429-238
INSTALLATION
4-2 December 1, 1997 Revised
Welding
Current
Amperes
TOTAL LENGTH OF LEAD CIRCUIT IN FEET (AND METERS)
(ELECTRODE LEAD PLUS WORK LEAD)
50 Feet
(15.2 M)
100 Feet
(30.5 M)
150 Feet
(45.7 M)
200 Feet
(61.0 M)
250 Feet
(76.2 M)
100
150
200
250
300
350
400
450
#4
#4
#2
#1
#1/0
#1/0
#2/0
#2/0
#4
#2
#1
#1
#1/0
#2/0
#2/0
#2/0
#2
#1
#1/0
#2/0
#3/0
#3/0
#4/0
#4/0
#1
#1/0
#2/0
#3/0
#4/0
#4/0
#1
#2/0
#3/0
#4/0
Tableshowsweldingleadsizesrecommendedforvariouslengthsofleads.Footageshown includescomplete
welding (secondary) circuit, both electrode and work leads. Lead size shown is for 90°C insulation, 30°C
(86°F) ambient, and not over 4.5 volts lead drop.
Table 4-3 Welding Leads
430429-238
INSTALLATION
December 1, 1997 Revised 4-3
Figure 4-1 Outline Dimensions
MA-3, MA-4, MA-5
A 21-1/2 in. (546 mm)
B 26-1/2 in. (673 mm)
C 29-1/2 in. (749 mm)
D 19-3/4 in. (502 mm)
E 21-3/8 in. (543 mm)
F 13/16 in. (21 mm)
G 14-9/16 in. (370 mm)
H 14-3/4 in. (375 mm)
J 7-3/16 in. (183 mm)
K 20-3/4 in. (527 mm)
L 4-3/16 in. (106 mm)
M 29-1/8 in. (738 mm)
MA-7
A 24-1/2 in. (616 mm)
B 26-1/2 in. (673 mm)
C 29-1/2 in. (749 mm)
D 22-1/2 in. (572 mm)
E 21-0 in. (610 mm)
F 3/4 in. (19 mm)
G 16-3/16 in. (411 mm)
H 19-3/4 in. (502 mm)
J 7-3/16 in. (183 mm)
K 25-3/4 in. (654 mm)
L 4-3/16 in. (106 mm)
M 34-1/8 in. (867 mm)
430429-238
INSTALLATION
4-4 December 1, 1997 Revised
OPERATION
Sequence Of Operation
1. Set INPUT CONTACTOR CONTROL Switch to
ON (UP) position. The mechanical contactor should
close, and the amber pilot light on the panel should
be illuminated.The mechanical contactorenergizes
the Main Power Transformer, which energizes the
fan motor.
2.ForLOCALcontrol,setthe REMOTE CONTAC-
TORCONTROL Switchandthe REMOTE AMPER-
AGE CONTROL Switch to LOCAL (DOWN)
position. The REMOTE CONTACTOR CONTROL
Switch energizes the SCRs (see Connection Dia-
gram in DIAGRAMS chapter) and open-circuit volt-
ageisappliedtotheoutputterminals.TheREMOTE
AMPERAGE CONTROL Switch allows control by
the CURRENT CONTROL potentiometer located in
the center of the front panel.
3. For REMOTE control, set the above switches to
REMOTE (UP) position. For this mode of operation
it will be necessary to use a REMOTE CONTROL
PENDANT, plugged into the REMOTE CONTROL
RECEPTACLE, in order to energize the SCRs and
control the current. The two remote switches work
independently of each other. The following combi-
nations can be accomplished:
a. Remote welding contactor control.
b. Remote current control.
c. Both of the above at the same time.
4.TheRANGESWITCHsettingwillbedetermined
by the work application, considering characteristics
of the workpiece and electrode. LOW range is des-
ignated as number 1 and HIGH range is number 2.
5. The ARC FORCE AMPERE CONTROL poten-
tiometer varies the dynamic slope of the volt-amp
curves. It essentially changes the short-circuit (arc)
current. Turning the potentiometer knob clockwise
causes forceful arcinitiation, with a hard-driving arc
maintained.Turningtheknobcounterclockwisecre-
ates a softer start, with a smooth arc.
NOTE: When using GTAW (TIG) and
Plasma Processes, it is recommended that
the Arc Force Control be set to
minimum
setting.
The setting of the potentiometer is dependent
upon the type of joint and the electrode being used.
See paragraph entitled ARC FORCE AMPERE
CONTROL under DESCRIPTION OF EQUIP-
MENT chapter included in this manual.
High Frequency Considerations
When operating the unit in a high frequency at-
mosphere, or witha highfrequency attachment, the
following guidelines should be adhered to, to mini-
mize interference.
1. Turn the high frequency intensity on machines
or attachments to the lowest level which will not
interfere with arc starting.
2. Use the shortest possible TIG Torch cable and
do not route it with other control cables and power
cables.
3. Make certain that all equipment cases are earth
grounded. A large ground wire between a high
frequency attachment case and ground is helpful.
4. Do not coil power cables on control cables. It is
best to route cables on the floor rather than over-
head and among other cables. (This minimizes
antenna effects.)
5. The input power cable to a high frequency
attachment should be as short as possible.
6. The input leads to the power source should be
contained in solidmetalconduit whenever possible.
When TIG welding at very low current (less than
30 amperes), a jumper plug can be changed on the
printed circuit board (369511) to insure that the
open-circuit voltage will stay at maximum value.
This will reduce the possibility of high frequency
interference when operating at low reference volt-
ages. In order to make this change, follow this
procedure:
1. Remove the left side panel.
2. At the bottom of the printed circuit board there
is a plug labeled J6. (See Figure 7-5 in TROU-
BLESHOOTING Chapter.) Remove this plug from
pins 1 and 2, and place it on pins 2 and 3.
3. Replace side panel.
430429-238
OPERATION
December 1, 1997 Revised 5-1
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430429-238
OPERATION
5-2 December 1, 1997 Revised
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Thermal Arc Mega-ArcConstant Current Welding Machine Installation guide

Category
Welding System
Type
Installation guide
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