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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OM-486 Page 9

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Miller Electric 251 NT manual Symbol Definitions, Weld, Power, And Engine Specifications

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.