MOVING PARTS can cause injury.

D Keep away from fans, belts, and rotors.

D Keep all doors, panels, covers, and guards closed and securely in place.

DStop engine before installing or connecting unit.

DHave only qualified people remove guards or covers for maint- enance and troubleshooting as necessary.

DTo prevent accidental starting during servicing, disconnect negative (–) battery cable from battery.

DKeep hands, hair, loose clothing, and tools away from moving parts.

DReinstall panels or guards and close doors when servicing is finished and before starting engine.

DBefore working on generator, remove spark plugs or injectors to keep engine from kicking back or starting.

DBlock flywheel so that it will not turn while working on generator components.

BATTERY EXPLOSION can BLIND.

DAlways wear a face shield, rubber gloves, and

protective clothing when working on a battery.

DStop engine before disconnecting or connect- ing battery cables or servicing battery.

DDo not allow tools to cause sparks when working on a battery.

DDo not use welder to charge batteries or jump start vehicles.

DObserve correct polarity (+ and –) on batteries.

DDisconnect negative (–) cable first and connect it last.

BATTERY ACID can BURN SKIN and EYES.

DDo not tip battery.

DReplace damaged battery.

DFlush eyes and skin immediately with water.

ENGINE EXHAUST GASES can kill.

DUse equipment outside in open, well-ventilated areas.

DIf used in a closed area, vent engine exhaust outside and away from any building air intakes.

ENGINE HEAT can cause fire.

DDo not locate unit on, over, or near combustible surfaces or flammables.

DKeep exhaust and exhaust pipes way from flammables.

EXHAUST SPARKS can cause fire.

DDo not let engine exhaust sparks cause fire.

DUse approved engine exhaust spark arrestor in required areas – see applicable codes.

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

FALLING UNIT can cause injury.

DUse lifting eye to lift unit only, NOT running gear, gas cylinders, trailer, or any other accessories.

DUse equipment of adequate capacity to lift and support unit.

DIf using lift forks to move unit, be sure forks are long enough to extend beyond opposite side of unit.

FLYING SPARKS can cause injury.

D Wear a face shield to protect eyes and face.

D Shape tungsten electrode only on grinder with proper guards in a safe location wearing proper face, hand, and body protection.

D Sparks can cause fires — keep flammables away.

OVERUSE can cause OVERHEATING.

DAllow cooling period; follow rated duty cycle.

DReduce current or reduce duty cycle before starting to weld again.

DDo not block or filter airflow to unit.

STATIC (ESD) can damage PC boards.

DPut on grounded wrist strap BEFORE handling boards or parts.

DUse proper static-proof bags and boxes to store, move, or ship PC boards.

TILTING OF TRAILER can cause injury.

DUse tongue jack or blocks to support weight.

DProperly install welding generator onto trailer according to instructions supplied with trailer.

OVERHEATING can damage motors.

DTurn off or unplug equipment before starting or stopping engine.

DDo not let low voltage and frequency caused by low engine speed damage electric motors.

DDo not connect 50 or 60 Hertz motors to the 100 Hertz receptacle where applicable.

READ INSTRUCTIONS.

DUse only genuine MILLER replacement parts.

DPerform engine maintenance and service according to this manual and the engine manual.

OM-486 Page 3

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Miller Electric 251 NT manual Moving Parts can cause injury, Battery Explosion can Blind, Engine Exhaust Gases can kill

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.