B. Auxiliary Power

Trouble

Remedy

 

 

No power output.

Reset circuit breakers CB1, CB2, CB3 and/or CB4 (see Section 6-1).

 

 

 

Check fuse F1, and replace if necessary (see Section 7-7).

 

 

 

Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.

 

 

Low power output.

Check and clean air cleaner as necessary.

 

 

 

Check and adjust engine speed (see Section 7-6).

 

 

 

See engine manual.

 

 

High power output.

Check and adjust engine speed (see Section 7-6).

 

 

Erratic power output.

Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.

 

 

 

Check receptacle wiring and connections.

 

 

 

Check governor according to engine manual.

 

 

C. Engine

Trouble

Remedy

 

 

Engine will not crank.

Check fuse F6, and replace if open (see Section 7-7).

 

 

 

Check battery voltage.

 

 

 

Check battery connections and tighten if necessary.

 

 

 

Check plug PLG5 and plug PLG8 connections.

 

 

 

Have Factory Authorized Service Agent check Engine Control switch S5.

 

 

Engine does not start.

Check fuel level (see Section 4-2).

 

 

 

Check battery and replace if necessary.

 

 

 

Check engine charging system according to engine manual.

 

 

 

See engine manual.

 

 

Engine starts but stops when Engine

Check oil level (see Section 4-2).

Control switch returns to Run position.

 

 

 

 

Check and refill crankcase with proper viscosity oil for operating temperature, if necessary (see Sec-

 

tion 7-2).

 

 

 

Have Factory Authorized Service Agent check low oil pressure shutdown switch S5.

 

 

Battery discharges between uses.

Clean top of battery with baking soda and water solution; rinse with clear water.

 

 

 

Periodically recharge battery (approximately every 3 months).

 

 

 

Replace battery.

 

 

 

Check voltage regulator according to engine manual.

 

 

Engine stopped during normal

Check fuel level (see Section 4-2).

operation.

 

 

 

 

Check oil level (see Section 4-2).

 

 

 

Have Factory Authorized Service Agent check low oil pressure shutdown switch S5.

 

 

Engine does not return to idle speed.

Be sure Engine Control switch S2 is in Run/Idle position.

 

 

 

Remove all weld and auxiliary power loads.

 

 

 

Turn off remote device connected to Remote 14 receptacle RC1 (see Section 4-8).

 

 

 

Check for obstructed movement of solenoid linkage (see Section 7-6).

 

 

 

Have Factory Authorized Service Agent check idle module PC1 and current transformer CT1.

 

 

Engine does not remain at weld/power

Place Engine Control switch in the Run position for small loads.

speed when power or weld load is

 

applied with Engine Control switch in

 

Run/Idle position.

 

 

 

OM-486 Page 29

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Miller Electric 251 NT manual Auxiliary Power, Engine, Check receptacle wiring and connections, Tion
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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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