AC/DC, 300/200 AC/DC Models: 225 And 300 Models: Arc .

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OM-316087 083LSeptember 2001ProcessesStick (SMAW) WeldingDescriptionAC/DC, 300/200 AC/DC Models:225 And 300 Models:Arc Welding Power SourceRThunderbolt XLAC/DC, 300/200 AC/DC, 225, And 300Visit our website atwww.MillerWelds.com

From Miller to YouThank you and congratulations on choosing Miller.Now you can get the job done and get it done right. Weknow you don’t have time to do it any other way.That’s why when Niels Miller first started building arcwelders in 1929, he made sure his products offeredlong-lasting value and superior quality. Like you, hiscustomers couldn’t afford anything less. Millerproducts had to be more than the best they could be.They had to be the best you could buy.Today, the people that build and sell Miller products continue thetradition. They’re just as committed to providing equipment and servicethat meets the high standards of quality and value established in 1929.This Owner’s Manual is designed to help you get the most out of yourMiller products. Please take time to read the Safety precautions. Theywill help you protect yourself against potential hazards on the worksite.We’ve made installation and operation quickand easy. With Miller you can count on yearsof reliable service with proper maintenance.And if for some reason the unit needs repair,there’s a Troubleshooting section that willMiller is the first welding help you figure out what the problem is. Theequipment manufacturer in parts list will then help you to decide whichthe U.S.A. to be registered tothe ISO 9001 Quality System exact part you may need to fix the problem.Standard.Warranty and service information for yourparticular model are also provided.Working as hard as you do– every power source fromMiller is backed by the mosthassle-free warranty in thebusiness.Miller offers a TechnicalManual which providesmore detailed service andparts information for yourunit. To obtain a TechnicalManual, contact your localdistributor. Your distributorcan also supply you withWelding Process Manualssuch as SMAW, GTAW,GMAW, and GMAW-P.Miller Electric manufactures a full lineof welders and welding related equipment.For information on other quality Millerproducts, contact your local Miller distributorto receive the latest full line catalog orindividual catalog sheets. To locate your nearestdistributor or service agency call 1-800-4-A-Miller,or visit us at www.MillerWelds.com on the web.

TABLE OF CONTENTSWARNINGThis product, when usedfor welding or cutting,produces fumes orgases which containchemicals known to theState of California tocause birth defects and,in some cases, cancer.(California Health &Safety Code Section25249.5 et seq.)SECTION 1 – SAFETY PRECAUTIONS FOR ARC WELDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1. Symbol Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-2. Arc Welding Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-3. Additional Installation, Operation, And Maintenance Hazards . . . . . . . . . . . . . . . . . . . . . . . . .21-4. Principal Safety Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21-5. EMF Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2SECTION 1 – MESURES DE SECURITE CONCERNANT LE SOUDAGE L’ARC . . . . . . . . . . . . . . .31-1. Symboles utilisés . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31-2. Dangers concernant le soudage à l’arc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31-3. Dangers supplémentaires en relation avec l’installation,le fonctionnement et la maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-4. Principales normes de sécurité . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-5. Information EMF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4SECTION 2 – INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92-1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92-2. Duty Cycle Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102-3. Volt-Ampere Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112-4. Selecting A Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132-5. Installing Electrode Holder And Work Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142-6. Weld Output Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142-7. Electrical Service Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152-8. Internal Connections For Operating 115/230 Volts, 225 Amperes ACAnd AC/DC Models From 115 Volts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162-9. Internal Connections For Operating 230/400 Volts, 300/200 Amperes AC/DC Or 300 Amperes ACModels From 230 Volts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172-10. Connecting Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18SECTION 3 – OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193-1. Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19SECTION 4 – MAINTENANCE & TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214-1. Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214-2. Lubricating Shunt Block And Anti-Noise Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214-3. Reinstalling Amperage Adjustment Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224-4. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23SECTION 5 – ELECTRICAL DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23SECTION 6 – WELDING METHODS & TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296-1. Shielded Metal Arc Welding (SMAW) Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .296-2. Electrode And Amperage Selection Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .306-3. Striking An Arc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .316-4. Positioning The Electrode Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .316-5. Weld Bead Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .326-6. Conditions That Affect Weld Bead Shape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .326-7. Electrode Movement During Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .336-8. Butt Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .336-9. Lap Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .346-10. Tee Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34SECTION 7 – PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

SECTION 1 – SAFETY PRECAUTIONS - READ BEFORE USINGsom nd 4/981-1. Symbol UsageMeans Warning! Watch Out! There are possible hazardswith this procedure! The possible hazards are shown inthe adjoining symbols.Y Marks a special safety message. Means “Note”; not safety related.This group of symbols means Warning! Watch Out! possibleELECTRIC SHOCK, MOVING PARTS, and HOT PARTS hazards.Consult symbols and related instructions below for necessary actionsto avoid the hazards.1-2. Arc Welding HazardsY The symbols shown below are used throughout this manual tocall attention to and identify possible hazards. When you seethe symbol, watch out, and follow the related instructions toavoid the hazard. The safety information given below is onlya summary of the more complete safety information found inthe Safety Standards listed in Section 1-4. Read and follow allSafety Standards.D If earth grounding of the workpiece is required, ground it directlywith a separate cable.Y Only qualified persons should install, operate, maintain, andrepair this unit.D Wear a safety harness if working above floor level.D Keep all panels and covers securely in place.Y During operation, keep everybody, especially children, away.D Clamp work cable with good metal-to-metal contact to workpieceor worktable as near the weld as practical.ELECTRIC SHOCK can kill.Touching live electrical parts can cause fatal shocksor severe burns. The electrode and work circuit iselectrically live whenever the output is on. The inputpower circuit and machine internal circuits are alsolive when power is on. In semiautomatic or automatic wire welding, thewire, wire reel, drive roll housing, and all metal parts touching thewelding wire are electrically live. Incorrectly installed or improperlygrounded equipment is a hazard.D Do not touch electrode if you are in contact with the work, ground,or another electrode from a different machine.D Use only well-maintained equipment. Repair or replace damagedparts at once. Maintain unit according to manual.D Insulate work clamp when not connected to workpiece to preventcontact with any metal object.D Do not connect more than one electrode or work cable to anysingle weld output terminal.SIGNIFICANT DC VOLTAGE exists after removal ofinput power on inverters.D Turn Off inverter, disconnect input power, and discharge inputcapacitors according to instructions in Maintenance Sectionbefore touching any parts.D Do not touch live electrical parts.D Wear dry, hole-free insulating gloves and body protection.D Insulate yourself from work and ground using dry insulating matsor covers big enough to prevent any physical contact with the workor ground.D Do not use AC output in damp areas, if movement is confined, or ifthere is a danger of falling.D Use AC output ONLY if required for the welding process.D If AC output is required, use remote output control if present onunit.D Disconnect input power or stop engine before installing orservicing this equipment. Lockout/tagout input power according toOSHA 29 CFR 1910.147 (see Safety Standards).D Properly install and ground this equipment according to itsOwner’s Manual and national, state, and local codes.D Keep your head out of the fumes. Do not breathe the fumes.D Always verify the supply ground – check and be sure that inputpower cord ground wire is properly connected to ground terminal indisconnect box or that cord plug is connected to a properlygrounded receptacle outlet.D When making input connections, attach proper grounding conductor first – double-check connections.D Frequently inspect input power cord for damage or bare wiring –replace cord immediately if damaged – bare wiring can kill.D Turn off all equipment when not in use.D Do not use worn, damaged, undersized, or poorly spliced cables.D Do not weld in locations near degreasing, cleaning, or spraying operations. The heat and rays of the arc can react with vapors to formhighly toxic and irritating gases.D Do not drape cables over your body.FUMES AND GASES can be hazardous.Welding produces fumes and gases. Breathingthese fumes and gases can be hazardous to yourhealth.D If inside, ventilate the area and/or use exhaust at the arc to removewelding fumes and gases.D If ventilation is poor, use an approved air-supplied respirator.D Read the Material Safety Data Sheets (MSDSs) and themanufacturer’s instructions for metals, consumables, coatings,cleaners, and degreasers.D Work in a confined space only if it is well ventilated, or whilewearing an air-supplied respirator. Always have a trained watchperson nearby. Welding fumes and gases can displace air andlower the oxygen level causing injury or death. Be sure the breathing air is safe.D Do not weld on coated metals, such as galvanized, lead, orcadmium plated steel, unless the coating is removed from the weldarea, the area is well ventilated, and if necessary, while wearing anair-supplied respirator. The coatings and any metals containingthese elements can give off toxic fumes if welded.OM-316 Page 1

ARC RAYS can burn eyes and skin.Arc rays from the welding process produce intensevisible and invisible (ultraviolet and infrared) raysthat can burn eyes and skin. Sparks fly off from theweld.D Wear a welding helmet fitted with a proper shade of filter to protectyour face and eyes