Miller Electric 251 NT manual Operating Auxiliary Equipment, Weld Current 120 240

Page 24

SECTION 6 – OPERATING AUXILIARY EQUIPMENT

6-1. Auxiliary Power Receptacles And Circuit Breakers

4

1

5

23

Simultaneous Welding And Auxiliary Power

Output

Weld Current

 

120 V

240 V

 

Watts

Receptacle

Receptacle

 

Amperes

 

 

Amperes

Amperes

 

 

 

 

 

 

 

 

 

250

3500

31

15.5

 

225

4260

39

19

 

200

5140

46

23

 

150

6700

60

30

 

100

8000

62.4

31.2

 

50

8000

62.4

31.2

 

0

8000

62.4

31.2

 

 

 

 

 

 

YIf unit does not have GFCI re-

ceptacles, use GFCI- protected extension cord.

.Auxiliary power decreases as weld current increases.

6

1240 V 50 A AC Receptacle RC1

RC1 supplies 60 Hz single-phase power at weld/power speed. Maxi- mum output is 8 kVA/kW.

2120 V 20 A AC Duplex Receptacle RC2

3120 V 20 A AC Duplex Receptacle RC3

RC2 and RC3 supply 60 Hz single- phase power at weld/power speed. Maximum output from RC2 or RC3 is 2.4 kVA/kW.

4 Circuit Breakers CB1 and CB2

CB1 and CB2 protect RC1 from over- load. If CB1 or CB2 opens, RC1 and one of the 120 volt receptacles does not work. 120 volts may still be pres- ent at RC1.

5Circuit Breaker CB3

6Circuit Breaker CB4

CB3 protects RC2 and CB4 protects RC3 from overload. If a circuit break- er opens, the receptacle does not work.

.Press button to reset circuit breaker. If breaker continues to

open, contact Factory Authorized Service Agent.

Combined output of all receptacles limited to 8 kVA/kW rating of the gen- erator.

EXAMPLE: If 20 A is drawn from each 120 V duplex receptacle, only 13 A is available at the 240 V receptacle:

2 x (120 V x 20 A) + (240 V x 13 A) = 8 kVA/kW

Ref. ST-189 925-A

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Contents OM-486 ProcessesDescription From Miller to You Table of Contents Page Symbol Usage Arc Welding HazardsElectric Shock can kill ARC Rays can burn eyes and skinEngine Hazards Battery Explosion can Blind Moving Parts can cause injuryEngine Exhaust Gases can kill Engine Heat can cause firePrincipal Safety Standards EMF InformationRadiation can cause interference ARC Welding can cause interferenceSignification des symboles Consignes DE SÉ Curité Lire Avant UtilisationUN Choc É Lectrique peut tuer LES Fumé ES ET LES GAZ peuvent ê tre dangereuxLE Soudage peut provoquer un in- cendie ou une explosion DES Particules Volantes peuvent blesser les yeuxDES PIÈ CES Chaudes peuvent provoquer des brû lures graves LE Bruit peut affecter l’ouïeDES Organes Mobiles peuvent provoquer des blessures ’EXPLOSION DE LA Batterie peutLA Chaleur DU Moteur peut pro- voquer un incendie LA Chute DE L’APPAREIL peut blesserPrincipales normes de sé curité Information sur les champs é lectromagné tiquesLE Soudage À L’ARC risque de provoquer des interfé rences Consignes relatives aux stimulateurs cardiaquesSpecifications Symbol DefinitionsWeld, Power, And Engine Specifications DefinitionsDimensions, Weights, and Operating Angles DimensionsFuel Consumption Auxiliary Power Curve Exceeding duty cycle can damage unit and void warrantyDuty Cycle CC/DC Mode CV/DC ModeCC/AC Mode Volt-Ampere CurvesInstallation Installing Welding GeneratorEngine Prestart Checks Activating The Dry Charge Battery If Applicable Do not overfill battery cellsRead and follow all instruc ChargerConnecting The Battery Installing Exhaust PipeConnecting To Weld Output Terminals Connect negative cable lastSelecting Weld Cable Sizes Remote 14 Receptacle Information100 ft 30 m Or Less 10 100% Duty CycleAdjusting MIG Weld Puddle Consistency Stop engineTo wet out weld puddle To stiffen weld puddleDC Polarity/AC Switch Do not switch under loadRemote Amperage/Voltage Switch Operating Welding GeneratorRemote Amperage/Voltage Control Auxiliary Power Receptacles And Circuit Breakers Operating Auxiliary EquipmentWeld Current 120 240 Optional Auxiliary Power Receptacles Gfci Receptacle OptionMaintenance and Troubleshooting Maintenance Label Servicing Air Cleaner Servicing Optional Spark ArrestorStop engine and let cool Changing Engine Oil, Oil Filter, And Fuel Filter Adjusting Engine Speed Idle Speed AdjustmentWeld/Power Speed Adjustment Troubleshooting Overload ProtectionWelding Trouble RemedyLow weld output Check control settings Check and clean air cleaner as necessary see SectionCheck and adjust engine speed see Section See engine manualAuxiliary Power Check receptacle wiring and connectionsEngine Check governor according to engine manualElectrical Diagram Circuit Diagram For Welding GeneratorST-190 578-B Auxiliary Power Guidelines Selecting EquipmentGrounding Generator To Truck Or Trailer Frame 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 xTypical Connections To Supply Standby Power 240 120 GroundSelecting Extension Cord Use Shortest Cord Possible Current Load Watts AmperesParts List Main Assembly24-Fig Dia Part Description Mkgs Quantity Panel, Front w/Components Panel, Front w/Components -1 Item Generator -1 Item Page Page Page Service Your distributor also givesSupport Owner’s Record Miller Electric Mfg. Co

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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