WARNING

This product, when used for welding or cutting, produces fumes or gases which contain chemicals known to the State of California to cause birth defects and, in some cases, cancer. (California Health & Safety Code Section 25249.5 et seq.)

WARNING

Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.

WARNING

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

The following terms are used interchangeably throughout this manual: MIG = GMAW, Wire Welding

TIG = GTAW

Stick = SMAW

TABLE OF CONTENTS

SECTION 1 – SAFETY PRECAUTIONS - READ BEFORE USING

1

1-1.

Symbol Usage

1

1-2.

Arc Welding Hazards

1

1-3.

Engine Hazards

2

1-4. Additional Symbols For Installation, Operation, And Maintenance

3

1-5.

Principal Safety Standards

4

1-6.

EMF Information

4

SECTION 1 – CONSIGNES DE SÉCURITÉ – LIRE AVANT UTILISATION

5

1-1.

Signification des symboles

5

1-2.

Dangers relatifs au soudage à l’arc

5

1-3.

Dangers existant en relation avec le moteur

6

1-4. Dangers supplémentaires en relation avec l’installation, le fonctionnement

 

 

et la maintenance

7

1-5.

Principales normes de sécurité

8

1-6.

Information sur les champs électromagnétiques

8

SECTION 2 – DEFINITIONS

9

2-1.

Symbol Definitions

9

SECTION 3 – SPECIFICATIONS

9

3-1. Weld, Power, And Engine Specifications

9

3-2. Dimensions, Weights, and Operating Angles

10

3-3.

Fuel Consumption

10

3-4.

Auxiliary Power Curve

11

3-5.

Duty Cycle

11

3-6.

Volt-Ampere Curves

12

SECTION 4 – INSTALLATION

13

4-1.

Installing Welding Generator

13

4-2.

Engine Prestart Checks

13

4-3. Activating The Dry Charge Battery (If Applicable)

14

4-4.

Connecting The Battery

15

4-5.

Installing Exhaust Pipe

15

4-6. Connecting To Weld Output Terminals

15

4-7. Selecting Weld Cable Sizes

16

4-8. Remote 14 Receptacle Information

16

4-9. Adjusting MIG Weld Puddle Consistency

17

SECTION 5 – OPERATING WELDING GENERATOR

18

5-1.

Front Panel Controls

18

5-2.

Remote Amperage/Voltage Control

19

SECTION 6 – OPERATING AUXILIARY EQUIPMENT

20

6-1. Auxiliary Power Receptacles And Circuit Breakers

20

6-2. Optional Auxiliary Power Receptacles

21

SECTION 7 – MAINTENANCE AND TROUBLESHOOTING

22

7-1.

Routine Maintenance

22

7-2.

Maintenance Label

23

7-3.

Servicing Air Cleaner

24

7-4. Servicing Optional Spark Arrestor

24

7-5. Changing Engine Oil, Oil Filter, And Fuel Filter

25

7-6.

Adjusting Engine Speed

26

7-7.

Overload Protection

27

7-8.

Troubleshooting

27

SECTION 8 – ELECTRICAL DIAGRAM

30

SECTION 9 – AUXILIARY POWER GUIDELINES

32

SECTION 10 – PARTS LIST

40

OPTIONS AND ACCESSORIES

 

WARRANTY

 

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Miller Electric 251 NT manual Table of Contents
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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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