Miller Electric 251 NT manual Typical Connections To Supply Standby Power, 240 120 Ground

Page 41

9-10. Typical Connections To Supply Standby Power

.Customer-supplied equipment is required if generator is to supply standby power during emergencies or power outages.

1

1Power Company Service Meter

2Main and Branch Overcurrent Protection

3Double-Pole, Double-Throw Transfer Switch

Obtain and install correct switch. Switch rating must be same as or greater than the branch overcurrent protection.

4Circuit Breakers or Fused Disconnect Switch

120/240 Volt

60Hz

Three-Wire Service

2

Load

7

6

120/240 Volt

Single-Phase

Three-Wire

Generator Output

Connection

240 V

 

Obtain and install correct circuit

 

 

 

 

breakers or switch.

120 V

 

5

Extension Cord

 

Select as shown in Section 9-11.

120 V

 

 

6

Generator Connections

 

 

Neutral

 

Connect terminals or plug of ade-

 

safety practices.

 

 

quate amperage capacity to cord.

 

3

Follow all applicable codes and

 

 

 

 

240 V

 

Turn off or unplug all equipment

 

 

connected to

generator before

 

 

starting or stopping engine. When

120 V

 

starting or stopping, the engine has

 

low speed which causes low volt-

 

 

120 V

 

age and frequency.

 

 

7

Load Connections

 

4

 

 

 

CB

 

 

 

 

or

 

Item 4 is not necessary if circuit

F1

 

protection is already present in

 

welding

generator

auxiliary

 

 

 

 

power output circuit.

 

 

5

 

 

 

240 V

 

 

 

 

120 V

 

 

 

 

120 V

 

 

 

 

Ground

 

 

 

 

S-0405-A

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Contents Description OM-486Processes From Miller to You Table of Contents Page Arc Welding Hazards Symbol UsageElectric Shock can kill ARC Rays can burn eyes and skinEngine Hazards Moving Parts can cause injury Battery Explosion can BlindEngine Exhaust Gases can kill Engine Heat can cause fireEMF Information Principal Safety StandardsRadiation can cause interference ARC Welding can cause interferenceConsignes DE SÉ Curité Lire Avant Utilisation Signification des symbolesUN Choc É Lectrique peut tuer LES Fumé ES ET LES GAZ peuvent ê tre dangereuxDES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer un in- cendie ou une explosionDES PIÈ CES Chaudes peuvent provoquer des brû lures 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 LA Chute DE L’APPAREIL peut blesserInformation sur les champs é lectromagné tiques Principales normes de sé curitéLE Soudage À L’ARC risque de provoquer des interfé rences Consignes relatives aux stimulateurs cardiaquesSymbol Definitions SpecificationsWeld, Power, And Engine Specifications DefinitionsFuel Consumption Dimensions, Weights, and Operating AnglesDimensions Duty Cycle Auxiliary Power CurveExceeding duty cycle can damage unit and void warranty CV/DC Mode CC/DC ModeCC/AC Mode Volt-Ampere CurvesEngine Prestart Checks InstallationInstalling Welding Generator Do not overfill battery cells Activating The Dry Charge Battery If ApplicableRead and follow all instruc ChargerInstalling Exhaust Pipe Connecting The BatteryConnecting To Weld Output Terminals Connect negative cable lastRemote 14 Receptacle Information Selecting Weld Cable Sizes100 ft 30 m Or Less 10 100% Duty CycleStop engine Adjusting MIG Weld Puddle ConsistencyTo wet out weld puddle To stiffen weld puddleDo not switch under load DC Polarity/AC SwitchRemote Amperage/Voltage Switch Operating Welding GeneratorRemote Amperage/Voltage Control Weld Current 120 240 Auxiliary Power Receptacles And Circuit BreakersOperating Auxiliary Equipment Gfci Receptacle Option Optional Auxiliary Power ReceptaclesMaintenance and Troubleshooting Maintenance Label Stop engine and let cool Servicing Air CleanerServicing Optional Spark Arrestor Changing Engine Oil, Oil Filter, And Fuel Filter Weld/Power Speed Adjustment Adjusting Engine SpeedIdle Speed Adjustment Overload Protection TroubleshootingWelding Trouble RemedyCheck and clean air cleaner as necessary see Section Low weld output Check control settingsCheck and adjust engine speed see Section See engine manualCheck receptacle wiring and connections Auxiliary PowerEngine Check governor according to engine manualCircuit Diagram For Welding Generator Electrical DiagramST-190 578-B Grounding Generator To Truck Or Trailer Frame Auxiliary Power GuidelinesSelecting Equipment How Much Power Does Equipment Require? Grounding When Supplying Building SystemsEarth ground if supplying Amperes x Volts = WattsApproximate Power Requirements For Farm/Home Equipment Approximate Power Requirements For Industrial MotorsIndustrial Motors Rating Starting Watts Running Watts Farm/Home Equipment Rating Starting Watts Running WattsContractor Rating Starting Watts Running Watts Approximate Power Requirements For Contractor EquipmentHow Much Power Can Generator Supply? Power Required To Start MotorSingle-Phase Induction Motor Starting Requirements KVA/HP x HP x240 120 Ground Typical Connections To Supply Standby PowerCurrent Load Watts Amperes Selecting Extension Cord Use Shortest Cord Possible24-Fig Parts ListMain Assembly Dia Part Description Mkgs Quantity Panel, Front w/Components Panel, Front w/Components -1 Item Generator -1 Item Page Page Page Support ServiceYour distributor also gives Miller Electric Mfg. Co Owner’s Record

251 NT specifications

The Miller Electric 251 NT is a highly regarded multi-process welding machine known for its versatility and advanced features, making it an ideal choice for professionals in various industries. With its robust construction and user-friendly interface, the 251 NT provides an efficient solution for MIG, TIG, and Stick welding applications.

One of the main features of the Miller Electric 251 NT is its impressive output range, which allows for welding on a variety of materials and thicknesses. It delivers up to 250 amps of power, enabling users to tackle both thin and thick metals with ease. Additionally, the machine is equipped with an Auto-Set feature, which automatically adjusts the welding settings according to the material thickness and type. This eliminates the guesswork, significantly enhancing productivity and reducing setup time.

Another noteworthy aspect of the Miller Electric 251 NT is its inverter technology. This advanced technology provides a compact, lightweight design without compromising performance. Inverter technology allows for greater energy efficiency, resulting in reduced operational costs over time. The 251 NT also features a Duty Cycle of 60% at 250 amps, which means it can handle demanding tasks while maintaining optimal performance.

The Miller Electric 251 NT is designed with user convenience in mind. The intuitive digital display offers clear visibility of the settings, allowing welders to make quick adjustments. Furthermore, the machine includes a built-in memory function to store frequently used parameters, enhancing workflow efficiency.

Safety is a key component of the 251 NT's design. It comes equipped with various safety features, including overload protection and a thermal overload warning system. These features ensure that the machine operates within safe limits, minimizing the risk of damage and ensuring longevity.

In terms of portability, the Miller Electric 251 NT's lightweight design and integrated handle make it easy to transport between job sites. The durable housing protects the internal components, making it suitable for rigorous use in demanding environments.

Overall, the Miller Electric 251 NT offers a combination of power, flexibility, and ease of use, making it a top choice for welders looking to enhance their capabilities across multiple welding processes. Whether in a professional shop or on a construction site, the 251 NT stands out as a reliable and efficient welding solution.
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