B-12

OPERATING INSTRUCTIONS

B-12

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SECURITY OF WELD PROCEDURE SETTINGS

There are two means provided to prevent or limit unauthorized readjustment of the NA-5 voltage and wire feed speed controls once set to the desired procedure.

1.The security panel of the NA-5 can be locked to prevent access to the control knobs.

2.The control range of the procedure control knobs can be limited to either about 3% or about 15% of the full range control by installing a knob rotation stop screw to any or all of the control knobs. This stop screw is installed in the following manner:

a.Turn off the input power to the NA-5.

b.Loosen each knob set screw and remove all knobs, including the rotary select switch knob.

c.Remove the felt seal and square spacer tube mounted behind each control knob.

d.Open the control box. Disconnect, then remove, the procedure control PC board assembly and its panel insulation.

e.Install a 1/2 in. long, pan or round head, #4 sheet metal screw into the 0.10 in. diameter hole located

beneath each square so the head is on the back side of the panel (inside the control box).

f.Remount the PC board assembly and its panel insulation. Reconnect the PC board and close and secure the control box.

g.Remount the rotary select switch knob and replace each square spacer tube and felt seal so the #4 screw protrudes between the tube and the felt seal.

h.Turn on the NA-5 input power and set the desired procedure by rotating the shafts of the controls.

i.Carefully replace each control knob so the #4 screw inserts into the center of the shorter length channel on the back of the knob for about 3% of the total range of control or into the center of the longer length channel for about 15% of the total range of control.

j.With finger pressure on the knob against the felt seal, carefully retighten the set screw of each knob.

NOTE: Steps h thru j will have to be repeated if it is desired to change the procedure settings to values outside the selected 3% or 15% control range limit.

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NA-5

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Lincoln Electric NA-5SF, NA-5NF service manual Security of Weld Procedure Settings

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.