Miller Electric 251 NT manual Specifications, Symbol Definitions

Page 13

SECTION 2 – DEFINITIONS

2-1. Symbol Definitions

Stop Engine

 

Fast

 

Fast/Slow

 

Slow (Idle)

 

(Run, Weld/Power)

 

(Run/Idle)

 

 

 

 

 

 

Start Engine

 

Panel/Local

 

Temperature

 

Fuel

Engine Oil

 

On

 

Check Valve

 

Battery (Engine)

 

 

Clearance

 

 

 

 

 

 

 

Engine

 

Read Operator’s

A

Amperes

V

Volts

 

Manual

 

 

 

 

MIG (GMAW),

 

Stick (SMAW)

 

TIG (GTAW)

 

Circuit Breaker

Wire

 

 

 

 

 

 

 

 

 

Positive

 

Negative

 

Alternating Current

 

Output

 

 

(AC)

 

 

 

 

 

 

 

Time

h

Hours

s

Seconds

 

Protective Earth

 

(Ground)

 

 

 

 

 

 

 

 

 

Do not switch while

14

Remote 14

 

Work Connection

 

Engine Choke

welding

Receptacle

 

 

Wire Feed

 

Electrode

 

Electrode Negative

 

 

 

Positive

 

 

 

 

 

 

 

 

 

SECTION 3 – SPECIFICATIONS

3-1. Weld, Power, And Engine Specifications

Welding

Rated

Maximum

Amperage

Voltage

Auxiliary

Fuel

 

Welding

Open-Circuit

Range In

Range In

Engine

Mode

Power Rating

Capacity

Output

Voltage

CC Mode

CV Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

250 A, 25 V,

 

 

 

 

 

 

CC/DC

100% Duty

80

40 – 250 A

 

 

 

 

 

Cycle

 

 

 

Continuous: 8 kVA/kW,

 

Onan P220

 

 

 

 

 

66.6/33.3 A,

 

Air-Cooled,

 

250 A, 25 V,

 

 

 

 

 

 

 

 

120/240 V AC, 60 Hz,

10 gal (38 L)

Two-Cylinder,

CV/DC

100% Duty

50

– –

10 – 40 V

Single-Phase,

Tank

Four-Cycle,

 

Cycle

 

 

 

 

 

 

 

Peak: 9 kVA/kW

 

20 HP Gasoline

 

 

 

 

 

 

 

200 A, 25 V,

 

 

 

(w/Weld Contactor Off)

 

Engine

CC/AC

60% Duty

75

40 – 200 A

 

 

 

 

 

Cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Contents Processes OM-486Description 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 DefinitionsDimensions Dimensions, Weights, and Operating AnglesFuel Consumption Exceeding duty cycle can damage unit and void warranty Auxiliary Power CurveDuty Cycle CV/DC Mode CC/DC ModeCC/AC Mode Volt-Ampere CurvesInstalling Welding Generator InstallationEngine Prestart Checks 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 Operating Auxiliary Equipment Auxiliary Power Receptacles And Circuit BreakersWeld Current 120 240 Gfci Receptacle Option Optional Auxiliary Power ReceptaclesMaintenance and Troubleshooting Maintenance Label Servicing Optional Spark Arrestor Servicing Air CleanerStop engine and let cool Changing Engine Oil, Oil Filter, And Fuel Filter Idle Speed Adjustment Adjusting Engine SpeedWeld/Power 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 Selecting Equipment Auxiliary Power GuidelinesGrounding Generator To Truck Or Trailer Frame 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 PossibleMain Assembly Parts List24-Fig Dia Part Description Mkgs Quantity Panel, Front w/Components Panel, Front w/Components -1 Item Generator -1 Item Page Page Page Your distributor also gives ServiceSupport 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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