Miller Electric Big Blue 251D manual Connecting Optional AC Power Plant, Tools Needed

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7-3. Connecting Optional AC Power Plant

14

13

12

11

10

93

91

90

92

15

1

F3

2

F2

3

F1

4

5

9	8	7		6
	AC			Single		Three
				Single		Three
				Phase		Phase
	Output			Phase		Phase
				1		3
	Volts			120/240		240
	Amps			31		24

	KVA/KW			7.5		10
	Frequency				60 Hz

	Engine Speed			1850 RPM
	Max. Fuse Size			35 Amperes

Lead 42 connects to GROUND stud on front of unit.

Jumper 42 is connected to 90 at factory.

YStop engine.

YPower and weld outputs are live at the same time. Disconnect or insulate unused cables.

.Have qualified person install

according to circuit diagram and Generator Power Guide- lines (Section 11).

Remove junction box cover.

1Lead 93

2Lead 92

3Lead 91

4Lead 90 (Neutral)

5Lead 42 (Circuit Grounding Lead)

Lead 42 connects to front panel Ground stud.

6Grounding Terminal

7Jumper Lead 42

8Isolated Neutral Terminal

Jumper 42 is connected to lead 90 at factory. Jumper 42 may be dis- connected from neutral to meet applicable electrical codes.

9Lead 80

10Receptacle RC9 leads

11Lead 42

12Lead 81

13Lead 82

14Load Terminals Connect leads to terminals.

15Fuses F1, F2, And F3

F1, F2, and F3 protect each load line from overload.

.Set Engine Control switch to

Run when using generator power.

Tools Needed:

Ref. S-179 637-B

OM-480 Page 22

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Contents Visit our website at OM-480128 576AC January ProcessesDescription Engine Driven Welding GeneratorFrom Miller to You Table of Contents Options and Accessories Warranty Symbol Usage Arc Welding HazardsEngine Hazards Compressed Air Hazards EMF Information Principal Safety StandardsCalifornia Proposition 65 Warnings Radiation can cause interferenceUN Choc Électrique peut tuer Signification des symboles− Consignes DE Sécurité − Lire Avant Utilisation LES Fumées ET LES GAZ peuvent être dangereuxDES Pièces Chaudes peuvent provoquer des brûlures graves LE Soudage peut provoquer un in- cendie ou une explosionDES Particules Volantes peuvent blesser les yeux LE Bruit peut affecter l’ouïeLA Chaleur DU Moteur peut pro- voquer un incendie ’EXPLOSION DE LA Batterie peutDES Organes Mobiles peuvent provoquer des blessures ’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 Fuel Consumption Curve shows typical fuel use under weld or power loadsExceeding duty cycle can damage unit and void warranty Duty Cycle And OverheatingAC Generator Power Volt-Ampere CurvesOptional AC Power Plant Curves Connecting The Battery − InstallationInstalling Welding Generator Stop engine and let cool Installing Muffler PipeEngine Prestart Checks Fuel Do not use gasoline. GasolineInstalling Ether Cylinder Optional Ether Starting Aid Connecting To Weld Output Terminals350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Selecting Weld Cable Sizes150 ft 200 ft 250 ft Put terminals− Operating the Welding Generator Controls See SectionStop engine and fix trouble if either light goes on Description Of Front Panel Controls See SectionRemote A/V Control 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 Circuit Breakers CB1 And CB2 Volt Duplex Receptacle Optional240 V 15 a AC Receptacle RC1 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 To replace primary fuel filter Servicing Fuel And Lubrication SystemsTo change oil and filter To replace secondary fuel filterModels With Automatic Idle Optional Adjusting Engine SpeedStandard Models Overload Protection Servicing Optional Ether Starting Aid Full EmptyStop engine and let cool. Reinstall cleanout plug Inspecting And Cleaning Optional Spark ArrestorTroubleshooting WeldingEngine Generator PowerCheck connections to ac power plant see Section Maximum see Section− Electrical Diagram Circuit Diagram For Welding GeneratorWelding Generator − RUN-IN ProcedureWetstacking Stop engine Do not touch hot exhaust Run-In Procedure Using Load BankProcedure at less than From flammables Do not PerformFrom flammables Run-In Procedure Using Resistance GridBank/grid Do not perform run-inGrounding Generator To Truck Or Trailer Frame − Generator Power GuidelinesSelecting Equipment Earth ground if supplying Grounding When Supplying Building SystemsHow Much Power Does Equipment Require? Amperes x Volts = WattsIndustrial Motors Rating Starting Watts Running Watts Approximate Power Requirements For Industrial MotorsApproximate Power Requirements For Farm/Home Equipment Farm/Home Equipment Rating Starting Watts Running WattsApproximate Power Requirements For Contractor Equipment Contractor Rating Starting Watts Running WattsSingle-Phase Induction Motor Starting Requirements Power Required To Start MotorHow Much Power Can Generator Supply? 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-480 120 121 117 − Parts List125 124 123 122 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 For assistance in filing or settling claims, contact To locate a Distributor or Service Agency visitMiller Electric Mfg. Co Your distributor and/or equipment manufacturer’s