SECTION 5 – OPERATING WELDING GENERATOR

5-1. Front Panel Controls

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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1 DC Polarity/AC Switch

YDo not switch under load.

Use switch to select AC weld output or polar- ity of DC weld output.

2 Process Select Switch

YDo not switch under load.

Use switch to select output for weld process.

3 A/V Control

Use control to select weld voltage or amperage. Control may be adjusted while welding.

4 Engine Control Switch

Use switch to start engine, select speed, and stop engine. In Run/Idle position, engine

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runs at idle speed at no load, and weld/power speed under load. In Run position, engine runs at weld/power speed.

.Place switch in Run position to operate most GMAW equipment.

5 Engine Choke Control

Use control to change engine air-fuel mix.

To Start: pull out choke and turn Engine Control switch to Start position. Release switch and slowly push choke in when engine starts.

.If the engine does not start, let the engine come to a complete stop before attempting restart.

To Stop: turn Engine Control switch to Off position.

6Engine Hour Meter

7Output (Contactor) Switch

Use switch to control remote contactor if connected to remote 14 receptacle RC1 (see Section 5-2).

YWeld output terminals are energized when Output (Contactor) switch is On and engine is running.

8 Remote Amperage/Voltage Switch

Use switch to select front panel or remote amperage/voltage control (see Section 5-2).

Ref. ST-189 925-A

OM-486 Page 18

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Miller Electric 251 NT Operating Welding Generator, Front Panel Controls, DC Polarity/AC Switch, Do not switch under load
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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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