Lincoln Electric NA-5NF, NA-5SF service manual External Resistance Test Leads #21 and #67

Models: NA-5S NA-5N NA-5SF NA-5NF

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TOC

F-51

TROUBLESHOOTING & REPAIR

F-51

 

 

EXTERNAL RESISTANCE TEST (LEADS #21 AND #67) (Continued)

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PROCEDURE

1.Make sure the electrode wire is fed through the wire contact assembly tip but NOT touching the "work" piece.

2.Disconnect input power to the NA-5.

3.Make sure the drive motor cable and power source control cables are properly connected to the NA-5 con- trol box.

4.Using the 5/16" nutdriver open the control box PC board access door.

5.Locate the TS1 terminal strip. See wiring diagram.

6.Using the ohmmeter check the resis- tances per the following table F.2

7.Reconnect the welding cable leads to the contact assembly.

8.If any of the resistances are not cor- rect per Table F.2 check the associ- ated leads, cables and circuits for "opens" or "shorts". See wiring dia- gram.

9.Close and secure the control box access door.

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TABLE F.2 EXTERNAL VOLTAGE SENSING LEADS TEST POINTS

TEST POINTS

EXPECTED

COMMENTS AND

 

RESISTANCES

CONDITIONS

Lead #667

Zero or less than

Electrode wire must be in

to

1 ohm

contact assembly tip

Electrode wire

 

 

 

 

 

Lead #621 to

Zero or less than

Polarity switches must be

work piece

1 ohm

in the correct positions

 

 

 

Lead #667 to

Greater than 15K

Using the 3/4" wrench

#621

ohms

disconnect the welding

 

 

cable(s) from the

 

 

contact assembly

 

 

 

NA-5

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Lincoln Electric NA-5S External Resistance Test Leads #21 and #67, Table F.2 External Voltage Sensing Leads 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.