Miller Electric 251 NT

OM-486 Page 30

SECTION 8 – ELECTRICAL DIAGRAM

Figure 8-1. Circuit Diagram For Welding Generator

Contents

Main Trailblazer 251 NT From Miller to You TABLE OF CONTENTS Page SECTION 1 SAFETY PRECAUTIONS - READ BEFORE USING 1-1. Symbol Usage 1-2. Arc Welding Hazards ELECTRIC SHOCK can kill. SIGNIFICANT DC VOLTAGE exists after stopping engine on inverters. 1-3. Engine Hazards FUEL can cause fire or explosion. STEAM AND HOT COOLANT can burn. MOVING PARTS can cause injury. BATTERY EXPLOSION can BLIND. 1-4. Additional Symbols For Installation, Operation, And Maintenance FALLING UNIT can cause injury. FLYING SPARKS can cause injury. OVERHEATING can damage motors. OVE RUS E can cause OVERHEAT ING. 1-5. Principal Safety Standards 1-6. EMF Information OM-486 Page 5 SECTION 1 CONSIGNES DE SCURIT LIRE AVANT UTILISATION 1-1. Signification des symboles 1-2. Dangers relatifs au soudage larc UN CHOC LECTRIQUE peut tuer. Une tension DC importante subsiste lintrieur des onduleurs aprs avoir coup lalimentation. 1-3. Dangers existant en relation avec le moteur LE CARBURANT MOTEUR peut pro- voquer un incendie ou une explosion. LA VAPEUR ET LE LIQUIDE DE REFROIDISSEMENT CHAUD peuvent provoquer des brlures. 1-4. Dangers supplmentaires en relation avec linstallation, le fonctionnement et la maintenance LE RAYONNEMENT HAUTE FR- QUENCE (H.F.) risque de provoquer des interfrences. LE SOUDAGE LARC risque de provoquer des interfrences. 1-5. Principales normes de scurit 1-6. Information sur les champs lectromagntiques SECTION 2 DEFINITIONS 2-1. Symbol Definitions SECTION 3 SPECIFICATIONS 3-1. Weld, Power, And Engine Specifications 3-2. Dimensions, Weights, and Operating Angles 3-3. Fuel Consumption 3-4. Auxiliary Power Curve 3-5. Duty Cycle A. CC/DC Mode B. CV/DC Mode C. CC/AC Mode 3-6. Volt-Ampere Curves SECTION 4 INSTALLATION 4-1. Installing Welding Generator 4-2. Engine Prestart Checks 4-3. Activating The Dry Charge Battery (If Applicable) + 4-4. Connecting The Battery + 4-5. Installing Exhaust Pipe 4-6. Connecting To Weld Output Terminals 4-7. Selecting Weld Cable Sizes NOTE 24 VOL TS AC A/V AMPERAGE VOL T AGE GND 4-9. Adjusting MIG Weld Puddle Consistency SECTION 5 OPERATING WELDING GENERATOR 5-1. Front Panel Controls 5-2. Remote Amperage/Voltage Control SECTION 6 OPERATING AUXILIARY EQUIPMENT 6-1. Auxiliary Power Receptacles And Circuit Breakers Simultaneous Welding And Auxiliary Power Output 6-2. Optional Auxiliary Power Receptacles Simultaneous Welding And Auxiliary Power Output SECTION 7 MAINTENANCE AND TROUBLESHOOTING 7-1. Routine Maintenance 8 h 20 h 25 h 50 h Page 7-3. Servicing Air Cleaner 7-4. Servicing Optional Spark Arrestor 7-5. Changing Engine Oil, Oil Filter, And Fuel Filter 7-6. Adjusting Engine Speed 7-7. Overload Protection 7-8. Troubleshooting A. Welding Page B. Auxiliary Power C. Engine Page Page SECTION 9 AUXILIARY POWER GUIDELINES 9-1. Selecting Equipment OR 9-2. Grounding Generator To Truck Or Trailer Frame 9-3. Grounding When Supplying Building Systems 9-4. How Much Power Does Equipment Require? 9-5. Approximate Power Requirements For Industrial Motors 9-6. Approximate Power Requirements For Farm/Home Equipment 9-7. Approximate Power Requirements For Contractor Equipment 9-8. Power Required To Start Motor 9-9. How Much Power Can Generator Supply? 9-10. Typical Connections To Supply Standby Power 9-11. Selecting Extension Cord (Use Shortest Cord Possible) SECTION 10 PARTS LIST Figure 10-1. Main Assembly Page Page Page Page Page Page Page Warranty Questions? Call 1-800-4-A-MILLER for your local Miller distributor. Effective January 1, 2000 (Equipment with a serial number preface of LA or newer) Please complete and retain with your personal records. For Service Always provide Model Name and Serial/Style Number. Owners Record