Burnback and Electrode Backup

B-8

OPERATING INSTRUCTIONS

B-8

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Wire Feed Motor Acceleration

WARNING

ELECTRIC SHOCK can kill.

•Turn off input power to the welding power source using the disconnect switch before working on this equipment.

The NA-5 has two different speeds of controlled wire feed motor acceleration. As shipped, the unit is connected for fast acceleration which is best for most applications. To change to the slower acceleration, turn off all input power to the NA-5 control box. Open the control box. Locate the Control PC Board mounted on the back of the box in the lower right hand corner. Change the jumper plug from the “F” pin to the “S” pin as shown in Figure B.2.

FIGURE B.2 – ACCELERATION

JUMPER PLUGS.

JUMPER

PLUG

The primary consideration in setting the arc stopping sequence is to prevent the electrode from sticking in the puddle. This is easily done with the machine as shipped.

NA-5

The standard stopping sequence when the optional “Crater Controls” are not used is as follows:

1.Press the “Stop” button.

2.The wire feed motor stops and the “Burnback Time Delay” starts.

3.The arc continues to burn the electrode back from the puddle until the arc goes out or the time set on the thumbwheel switch elapses. This control should be set for just enough burnback time to prevent crater sticking.

There are two other ways this circuit can be connected. One will cause the wire to retract* with a contactor drop out delay at the end of the weld. The second will cause the wire to retract* during burnback time, and there will be no contactor drop out delay at the end of the weld. If either one of these alternate methods of stopping the weld is desired, the connections on the logic board can be easily changed.

To change the stopping sequence, turn the input AC power off at the power source, remove the screw holding the inner panel, and swing the panel open. Change the connections (older models) or switch positions (newer models) on the logic board as shown in Table B.2.

Optional “Crater Controls”

This option is recommended for applications where the ending bead size must be controlled, applications when the crater must be filled, roundabouts, and any other welds where the end overlaps the start.

When the “Stop” button is pressed, the machine welds at the wire speed and voltage set by the “Crater Controls” until the time set on the thumbwheel switch elapses. The circuit then automatically switches to the arc stopping sequence described above.

NOTE: Setting crater time to 0.00 seconds will give zero crater time; however, the crater settings will be active during burnback time until the arc goes out.

*Wire will retract at weld mode speed (or crater mode speed, if installed) until the arc goes out and then retract at strike mode speed for the remainder of burnback time.

NA-5S, NA-5N, NA-5SF, NA-5NF specifications

The Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S are advanced welding helmets that are pivotal in enhancing the safety and efficiency of welders in various applications. These models are designed to provide exceptional protection and visibility, making them indispensable tools in the welding industry.

One of the main features of the NA-5 series is the auto-darkening filter technology. This feature allows the helmet to automatically adjust its shade based on the intensity of the arc. As the welder strikes an arc, the lens darkens instantaneously, shielding the eyes from harmful rays generated during the welding process. This functionality not only ensures safety but also enhances productivity, as welders do not need to manually flip the helmet up and down.

The helmets are equipped with a wide viewing area that allows for better visibility and precision while working. With a large lens, welders can easily monitor their work and surrounding environment, minimizing the risk of accidents. Additionally, the lightweight design of the NA-5NF, NA-5SF, NA-5N, and NA-5S provides comfort during extended periods of use, reducing neck strain and fatigue.

The NA-5 series is also well-regarded for its durability. Constructed from impact-resistant materials, these helmets can withstand the rigors of demanding work environments. This durability extends the lifespan of the helmet, making it a cost-effective investment for both professional and hobbyist welders.

Another notable characteristic is the adjustable sensitivity and delay settings found in certain models. These settings allow the user to customize the helmet based on their specific welding conditions. For instance, a welder can increase sensitivity for low-amperage tasks or adjust the delay to allow for a smoother transition from dark to light after completing a weld.

Furthermore, the helmets come with a reliable battery life, ensuring that they can be used for long periods without interruption. Some models also feature solar assist functionality, which helps recharge the auto-darkening filter, enhancing their overall efficiency.

In summary, the Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S welding helmets represent a significant advancement in personal protective equipment for welders. Their combination of auto-darkening technology, wide viewing area, lightweight design, durability, and customizable settings makes them an excellent choice for anyone engaged in welding tasks. With these helmets, users can achieve greater safety and efficiency in their work, enabling them to focus on their craft with peace of mind.