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F-47

TROUBLESHOOTING & REPAIR

F-47

 

 

VOLTAGE BOARD TRANSFORMER TEST (Continued)

24VAC

SECONDARY TEST POINTS

PIN #9

{

PIN #8

 

G1556-[ ]

VOLTAGE

NA-5

VOLTAGE BOARD

TRANSFORMER

FIGURE F.4 TRANSFORMER TEST POINTS

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7.Using the 115VAC supply carefully apply 115VAC to pins #8 and #9 in the nine pin molex plug cavity on the voltage board. See Figure F.4 Make sure the board and leads are insulated from each other and any metal conductors.

8.Using the voltmeter check for approximately 24VAC at the sec- ondary test points. See Figure F.4

Note: The secondary voltage will vary with the input primary voltage. The insulating material will have to be removed from the secondary test points to insure that the meter probes make good electrical contact.

9.If the secondary voltage is correct the transformer is functioning proper- ly.

10.If the secondary voltage is low or not present the transformer may be faulty.

11.Carefully remove the 115VAC sup- ply from the voltage board.

12.Install the voltage board and con- nect the molex plugs.

13.Close and secure the access door.

NA-5

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Lincoln Electric NA-5NF, NA-5SF service manual 24VAC Secondary Test Points

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.