Manuals / Miller Electric / Power Tools / Welding System

Miller Electric 301 G manual Overload Protection, Y Stop engine, When a circuit breaker or fuse

Models: 301 G

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8-6. Overload Protection

Located behind front panel.

Tools Needed:

3/8 in

YStop engine.

.When a circuit breaker or fuse

opens, it usually indicates a more serious problem exists. Contact a Factory Authorized Service Agent.

1 Circuit Breaker CB5

CB5 protects the 24 volt ac output to Remote receptacle RC4. If CB5 opens, 24 volt ac output to RC4 stops.

2Fuse F1 (See Parts List)

3Fuse F2 (See Parts List) Remove cover.

Fuse F1 is located on power board PC7. F1 protects the exciter stator from overload. If F1 opens, weld and generator power output stops.

Fuse F2 is located behind front panel. F2 protects the 115 volt ac output to Remote receptacle RC4. If F2 opens, 115 volt ac output to RC4 stops.

Replace fuse(s) if open. Reinstall cover before operating unit.

4 Fuse F6 (See Parts List)

F6 protects the engine wiring system from overload. If F6 opens, the engine will not crank. Replace fuse if open.

802 851-A / Ref. 211 909

OM-4411 Page 33

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Miller Electric 301 G manual Overload Protection, Y Stop engine, When a circuit breaker or fuse

Contents

OM-4411207 283E Miller LegendR 301 GProcesses DescriptionFrom Miller to You SECTION 5 − INSTALLATION TABLE OF CONTENTS8-2. Maintenance Label 8-3. Servicing Optional Spark Arrestor TABLE OF CONTENTS8-4. Servicing Air Cleaner 8-6. Overload Protection 8-7. Troubleshooting1-2. Arc Welding Hazards 1-1. Symbol UsageSECTION 1 − SAFETY PRECAUTIONS − READ BEFORE USING Means “Note” not safety relatedBATTERY EXPLOSION can BLIND 1-3. Engine HazardsWELDING can cause fire or explosion FLYING METAL can injure eyes1-4. Compressed Air Hazards 1-5. Additional Symbols For Installation, Operation, And MaintenanceSTEAM AND HOT COOLANT can burn ENGINE EXHAUST GASES can kill1-6. California Proposition 65 Warnings 1-7. Principal Safety Standards1-8. EMF Information READ INSTRUCTIONSSECTION 2 − CONSIGNES DE SÉCURITÉ − LIRE AVANT UTILISATION 2-1. Signification des symboles2-2. Dangers relatifs au soudage à l’arc UN CHOC ÉLECTRIQUE peut tuerLE SOUDAGE peut provoquer un in- cendie ou une explosion 2-3. Dangers existant en relation avec le moteurDES PARTICULES VOLANTES peuvent blesser les yeux DES PIÈCES CHAUDES peuvent provoquer des brûlures gravesL’EXPLOSION DE LA BATTERIE peut RENDRE AVEUGLE 2-4. Dangers liés à l’air compriméDES ORGANES MOBILES peuvent provoquer des blessures LA CHALEUR DU MOTEUR peut pro- voquer un incendie2-7. Information sur les champs électromagnétiques 2-6. Principales normes de sécuritéLE SURCHAUFFEMENT peut endom- mager le moteur électrique LES ÉTINCELLES VOLANTES ris- quent de provoquer des blessuresSECTION 3 − DEFINITIONS 3-1. Symbol DefinitionsWork like a Pro 4-2. Weld, Power, And Engine Specifications SECTION 4 − SPECIFICATIONS4-3. Dimensions, Weights, and Operating Angles 4-1. Description4-5. Generator Power Curve 4-4. Fuel Consumption While Welding And Using Generator PowerY Exceeding duty cycle can damage unit and void warranty 4-6. Duty CycleWork like a Pro Continuous WeldingA. CC/DC Stick Mode 4-7. Stick And MIG Mode Volt-Ampere CurvesB. CV/DC MIG Mode Work like a Pro 4-8. DC TIG Mode Volt-Ampere Curves5-1. Installing Welding Generator SECTION 5 − INSTALLATIONMovement Y Do not lift unit from end LocationFollow run-in procedure in engine manual 5-2. Engine Prestart ChecksTo improve cold weather starting Keep battery in good condition Store battery in warm area Use correct grade oil for cold weatherY Do not overfill battery cells 5-3. Activating The Dry Charge Battery If ApplicableWhen electrolyte is low, add Y Read and follow all instruc5-5. Installing Exhaust Pipe 5-4. Connecting The BatteryY Connect negative − cable last Y Stop engine and let coolSelecting Weld Cable Sizes Connecting To Weld Output Terminals24 VOLTS AC 5-8. Remote Receptacle Information115 VOLTS AC AMPERAGEY Stop engine and let cool 5-9. Adjusting Wire MIG Weld Puddle ConsistencyFor wetter weld puddle for mild steel For wettest weld puddle for stainless steel6-1. Front Panel Controls SECTION 6 − OPERATING WELDING GENERATORGenerator power is available at recep 6-2. Description Of Front Panel ControlsControlling Engine Speed And Weld/Generator Power Output Speed Control Switch In Weld Engine Control Switch in 3600/2400 RPMProcess Switch Settings 6-3. Process SwitchSwitch Setting Processtween pins A and B example 6-4. Remote Amperage/Voltage ControlEngine runs at weld speed when receptacle makes closure beSECTION 7 − OPERATING AUXILIARY EQUIPMENT 7-1. 60 Hz Generator Power Receptacles And Circuit BreakersControlling Engine Speed And Weld/Generator Power Output Generator power is available atWork like a Pro 7-2. Variable Frequency Hz Generator Power Receptacle RC3ceptacle RC3 1 120 V 20 A Variable FrequencyReceptacle Each 120 V DuplexCurrent Available in Amperes Receptacle8-1. Routine Maintenance SECTION 8 − MAINTENANCE & TROUBLESHOOTINGEvery 8 h 20 h8-3. Servicing Optional Spark Arrestor 8-2. Maintenance LabelY Stop engine and let cool 803 127 / Ref. 211Y Do not run engine without air cleaner or with dirty element 8-4. Servicing Air CleanerY Stop engine Y Stop engine and let cool 8-5. Changing Engine Oil, Oil Filter, And Fuel FilterY Close valve and valve cap before adding oil and run- ning engine Y Stop engine, tighten connec- tions as necessary, and wipe up fuelWhen a circuit breaker or fuse 8-6. Overload ProtectionY Stop engine A. Welding 8-7. TroubleshootingTrouble RemedyC. Variable Frequency Generator Power Receptacle RC3 B. 60 Hz Generator Power Receptacles RC1 And RC2Trouble RemedyTrouble D. EngineRemedy Over 80,000 trained since Start Your Professional Welding Career Now400 Trade Square East, Troy, Ohio Figure 9-1. Circuit Diagram For Welding Generator SECTION 9 − ELECTRICAL DIAGRAM211 395-C OM-4411 Page10-1. Selecting Equipment SECTION 10 − GENERATOR POWER GUIDELINES10-2. Grounding Generator To Truck Or Trailer Frame has this symbol10-4. How Much Power Does Equipment Require? 10-3. Grounding When Supplying Building Systemsearth ground if supplying Use ground device as stated10-6. Approximate Power Requirements For Farm/Home Equipment 10-5. Approximate Power Requirements For Industrial MotorsIndustrial Motors RatingContractor 10-7. Approximate Power Requirements For Contractor EquipmentRating Starting Watts10-9. How Much Power Can Generator Supply? 10-8. Power Required To Start MotorSingle-Phase Induction Motor Starting Requirements Motor StartWork like a Pro 10-10. Typical Connections To Supply Standby PowerCord Lengths for 120 Volt Loads 10-11. Selecting Extension Cord Use Shortest Cord PossibleCurrent Load Watts20 Gauge .037 in 18 Gauge .050 in 16 Gauge .063 in MATERIAL THICKNESS REFERENCE CHART 24 Gauge .025 in 22 Gauge .031 in14 Gauge .078 in 1/8 in .125 in 3/16 in .188 in 1/4 in .25 in 5/16 in .313 in 3/8 in .375 in 1/2 in .5 inSECTION 11 − PARTS LIST Figure 11-1. Main AssemblyGrommet, Plastic Neck Filler Fuel Figure 11-1. Main AssemblyStart Your Professional Welding Career Now Figure 11-1. Main Assembly ContinuedOver 80,000 trained since Front w/Components Figure 11-2. PanelFigure 11-2. Panel Front w/Components Figure 11-1 ItemFigure 11-2. Panel, Front w/Components Continued Figure 11-2. Bracket w/Components Figure 11-1 Item Figure 11-3. Bracket w/ComponentsHardware is common and not available unless listed Figure 11-4. Generator Figure 11-4. Generator Figure 11-1 ItemStator, Generator Service Warranty Questions?Call 1-800-4-A-MILLER for your local Miller distributor SupportOwner’s Record For ServicePlease complete and retain with your personal records Always provide Model Name and Serial/Style Number