D-2

MAINTENANCE

D-2

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

CONTROL BOX

GENERAL

Inspect the control box every 3 months. If needed, blow dirt out using low pressure air. No further maintenance should be required.

CIRCUIT PROTECTION

The circuit breaker mounted on the left side of the control box protects the control circuit from short circuit conditions and from severe wire feed overloads. If it is open, determine and correct the cause for the overload. To reset the circuit breaker, push in the red button shown in Figure D.1.

FIGURE D.1 – CIRCUIT BREAKER

RESET BUTTON.

If a complete or partial short occurs in the field circuit, or if there is a defect on the PC board, a 1/2 amp slow-blow type fuse will blow. This field circuit fuse is mounted on the power PC board, shown in Figure D.2, inside the control box. Before replacing the fuse, check the motor field for a short condition. Normal resistance is approximately 700 ohms.

With NA-5 controls above Code 8300, the field circuit fuse may blow due to frequent motor field reversals from application problems affecting the “cold” starting circuit, such as the power source output being too low to establish an arc or the welding procedure causing frequent electrode-to- puddle shorting. (Refer to Automatic Shutdown in Section B, Operating Instructions.)

FIGURE D.2 – POWER PC BOARD

FUSE LOCATIONS.

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

NA-5 POWER

 

 

FIELD

POWER

1/2 AMP

1/2 AMP

SLOW-BLOW

SLOW-BLOW

FUSE

FUSE

 

The power supply for the electronic circuitry

is protected by a 1/2 amp slow-blow type fuse

shown in Figure D.2. It is located on the

power PC board inside the control box.

CIRCUIT

 

BREAKER

 

RESET BUTTON

 

NA-5

 

Page 43
Image 43
Lincoln Electric NA-5SF, NA-5NF service manual Maintenance, Control BOX, General, Circuit Protection

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.