Miller Electric Big Blue 251D manual Adjusting Engine Speed, Standard Models

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8-5. Adjusting Engine Speed

Standard Models

1850 rpm

(61.6 Hz)

1250 rpm

(41.5 Hz)

After tuning engine, check engine no load speed with a tachometer (see table for no load speeds). If necessary, adjust speed as follows:

Start engine and run until warm. Turn Amperage/Voltage Control to 100.

Standard Models:

1Engine Speed Adjustment Screw

2Locking Nut

Loosen nut. Turn screw until engine runs at 1850 rpm. Tighten nut.

Models With Automatic Idle (Optional)

3Throttle Rod

4Locknut

Loosen locknuts. Place engine control switch in Run/Idle position.

Turn throttle rod until engine runs at idle speed. Tighten locknuts.

5Engine Speed Adjustment Screw

6Locknut

Place engine control switch in Run position.

Loosen locknut. Turn screw until engine runs at weld/power speed. Tighten locknut.

YStop engine.

Models With Automatic Idle (Optional)
4	3	4

Tools Needed:

3/8, 7/16 in

Ref. 801 179 / Ref. 800 159-D / Ref. 800 161

OM-480 Page 28

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Contents Processes DescriptionVisit our website at OM-480128 576AC January Engine Driven Welding GeneratorFrom Miller to You Table of Contents Options and Accessories Warranty Symbol Usage Arc Welding HazardsEngine Hazards Compressed Air Hazards Principal Safety Standards California Proposition 65 WarningsEMF Information Radiation can cause interferenceSignification des symboles − Consignes DE Sécurité − Lire Avant UtilisationUN Choc Électrique peut tuer LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un in- cendie ou une explosion DES Particules Volantes peuvent blesser les yeuxDES Pièces Chaudes peuvent provoquer des brûlures graves LE Bruit peut affecter l’ouïe’EXPLOSION DE LA Batterie peut DES Organes Mobiles peuvent provoquer des blessuresLA Chaleur DU Moteur peut pro- voquer un incendie ’AIR Comprimé peut provoquer des blessuresPrincipales normes de sécurité Information sur les champs électromagnétiquesSymbols And Definitions − DefinitionsDimensions, Weights, And Operating Angles − SpecificationsWeld, Power, And Engine Specifications Curve shows typical fuel use under weld or power loads Exceeding duty cycle can damage unit and void warrantyFuel Consumption Duty Cycle And OverheatingAC Generator Power Volt-Ampere CurvesOptional AC Power Plant Curves Connecting The Battery − InstallationInstalling Welding Generator Installing Muffler Pipe Engine Prestart ChecksStop engine and let cool Fuel Do not use gasoline. GasolineInstalling Ether Cylinder Optional Ether Starting Aid Connecting To Weld Output TerminalsSelecting Weld Cable Sizes 150 ft 200 ft 250 ft350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Put terminals− Operating the Welding Generator Controls See SectionDescription Of Front Panel Controls See Section Remote A/V ControlStop engine and fix trouble if either light goes on Do not use Ether if engine is runningX 15 a + 120 V x 10 a = 3.0 kVA/kW OM-480 − Operating Auxiliary EquipmentVolt Duplex And Optional Gfci Receptacles Volt Duplex Receptacle Optional 240 V 15 a AC Receptacle RC1Circuit Breakers CB1 And CB2 X 10 a + 120 V x 5 a = 3.0 kVA/kWConnecting Optional AC Power Plant 240 Volt Twistlock Receptacle Optional − Maintenance and Troubleshooting Maintenance Label Servicing Air Cleaner Servicing Fuel And Lubrication Systems To change oil and filterTo replace primary fuel filter To replace secondary fuel filterModels With Automatic Idle Optional Adjusting Engine SpeedStandard Models Overload Protection Servicing Optional Ether Starting Aid Full EmptyInspecting And Cleaning Optional Spark Arrestor TroubleshootingStop engine and let cool. Reinstall cleanout plug WeldingGenerator Power Check connections to ac power plant see SectionEngine Maximum see Section− Electrical Diagram Circuit Diagram For Welding GeneratorWelding Generator − RUN-IN ProcedureWetstacking Run-In Procedure Using Load Bank Procedure at less thanStop engine Do not touch hot exhaust From flammables Do not PerformRun-In Procedure Using Resistance Grid Bank/gridFrom flammables Do not perform run-inGrounding Generator To Truck Or Trailer Frame − Generator Power GuidelinesSelecting Equipment Grounding When Supplying Building Systems How Much Power Does Equipment Require?Earth ground if supplying Amperes x Volts = WattsApproximate Power Requirements For Industrial Motors Approximate Power Requirements For Farm/Home EquipmentIndustrial Motors Rating Starting Watts Running Watts Farm/Home Equipment Rating Starting Watts Running WattsApproximate Power Requirements For Contractor Equipment Contractor Rating Starting Watts Running WattsPower Required To Start Motor How Much Power Can Generator Supply?Single-Phase Induction Motor Starting Requirements KVA/HP x HP x 1000 = Starting AmperageTypical Connections To Supply Standby Power Work like a ProSelecting Extension Cord Use Shortest Cord Possible Current Load Watts AmperesOM-480 − Parts List 125 124 123 122120 121 117 1162526 126 Dia Part Description Quantity Mkgs 128 Panel, Front w/Components -1Item 111Panel, Front w/Components -1Item 111 Cont’d Generator Generator -1Item 114 IncludesPage Page Support ServiceYour distributor also gives To locate a Distributor or Service Agency visit Miller Electric Mfg. CoFor assistance in filing or settling claims, contact Your distributor and/or equipment manufacturer’s