Section TOC

Master TOC

F-66

TROUBLESHOOTING & REPAIR

F-66

 

 

 

METER CIRCUIT ACCURACY TEST (Continued)

 

6.

Test for DC volts on the voltmeter 7. Test Digital Voltmeter Accuracy

 

 

PC board.

 

Return to

Return to Section TOC

Check for 4.75 to 5.25VDC from TP5 to lead #510C. See Figure F.9

Note: The coating will have to be removed from the test points to ensure accurate voltmeter readings.

If the display is NOT lit and the correct DC voltage is present at TP5 to lead #510C, the digital meter may be faulty. Replace the meter.

If the AC voltage IS present at leads #601 to #602 and the DC voltage is missing, the voltmeter PC board may be faulty.

Use a test meter with at least 3- 1/2 digits and +/- 0.5% accuracy.

Connect the + probe to TP4 and the - probe to lead 510C. Do NOT disconnect plug.

Note: The coating will have to be removed from the test points to ensure accurate meter readings.

With the NA-5 voltmeter reading SET values of STRIKE voltage, adjust the strike voltage control until the test meter matches the settings in the table below.

If the NA-5 digital voltmeter does not match the readings, the digital meter may be faulty.

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

 

NA-5 SET VOLTS READING

TEST VOLTMETER READING

 

 

 

 

 

 

15.0VDC

.150 +/- .004VDC

 

 

30.0VDC

.300 +/- .004VDC

 

 

60.0VDC

.600 +/- .006 VDC

 

 

 

 

 

NA-5

Page 119
Image 119
Lincoln Electric NA-5SF, NA-5NF service manual NA-5 SET Volts Reading Test Voltmeter Reading

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.