TOC

F-48

TROUBLESHOOTING AND REPAIR

F-48

 

WELD CIRCUIT GROUND AND SHORT CIRCUIT TEST (continued)

 

Return to Section

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master

Return to Master TOC

Return to Master TOC

Return to Master TOC

PROCEDURE

1. Turn the engine off.

Weld circuit ground test:

1.Rotate the output control to the minimum output position.

2.Measure the resistance between either of the two weld output terminals and a clean chassis ground connection.

3.The resistance measurement should be very high 500,000 (500k) Ohms minimum.

If the resistance is lower than 500k Ohms:

4.Move the output control away from the minimum position and recheck the resistance. If the resis- tance is now 500k Ohms or greater; check for a damaged or missing insulator bushing at the output control unit.

5.If the resistance is still less than 500k Ohms, Remove the welding generator brushes, or pull them away from the commutator and isolate them so they cannot come in contact with anything except the brush holder where they are attached.

6.Check the resistance between chassis ground and each output terminal, and between chassis ground and the commutator.

If the commutator has low resistance to chassis ground, the armature is defective.

7.If the resistance measured at the “WORK” terminal is low, carefully examine the interpole coils, and the heavy leads, and the brush holders connected to the interpole coils. Check for damaged, dirty or missing brush holder insulators. Check for a dam- aged or dirty weld output “WORK” terminal.

8.If the resistance measured at the “ELECTRODE” terminal is low, examine the output control unit, the series coils, and the heavy leads and brush holders connected to them. Check for damaged, dirty or missing brush holder insulators. Check for a dam- aged or dirty weld output “ELECTRODE” terminal. If necessary, disconnect the output control unit and test it separately. See the Output Control Unit (Variable Reactor) Inspection and Service Procedure.

9.Test for a short circuit condition between the elec- trode and work circuits.

10.With the brushes still isolated as described above, check the resistance between the two weld termi- nals. The resistance should be very high, 500,000 (500k) Ohms minimum.

11.If the resistance measurement is too low, check the heavy weld current carrying leads and connec- tions for damaged insulation or dirt buildup between the electrode (Series Coils) and work (Interople Coils) circuits. If the low resistance point is between the stator coils, the coils will require replacement or repair.

SAE-400 SEVERE DUTY

Page 87 Page 89
Page 88
Image 88
Lincoln Electric SVM187-A service manual Weld circuit ground test, If the resistance is lower than 500k Ohms
Page 87 Page 89

SVM187-A specifications

The Lincoln Electric SVM187-A is a cutting-edge welding machine designed for professional welders and industrial applications. Known for its reliability and performance, it stands out in the competitive welding equipment market. This versatile machine is structured to handle various welding processes, making it a popular choice among users.

One of the primary features of the SVM187-A is its multifunctional capabilities. It supports MIG, TIG, and Stick welding, allowing users to switch between different welding techniques seamlessly. This flexibility makes it suitable for diverse applications, whether working on automotive repairs, metal fabrication, or construction projects. Additionally, the machine is equipped with a robust power output, ranging from low to high amperage settings, enabling users to tackle a wide array of materials, including mild steel, stainless steel, and aluminum.

The SVM187-A incorporates advanced inverter technology, which ensures increased efficiency and reduced energy consumption. This technology leads to a more compact design, making the unit portable and easy to transport. The lightweight construction of the machine does not compromise its durability; it is built with high-quality materials to withstand the rigors of a professional workshop.

Another notable characteristic of the SVM187-A is its user-friendly interface. The intuitive control panel includes digital displays for precise settings adjustments, ensuring accuracy during operation. Beginners and seasoned welders alike can benefit from the clear and straightforward design, reducing training time and enhancing productivity.

Safety features are paramount in the SVM187-A's design. The machine is equipped with thermal overload protection, ensuring that it operates within a safe temperature range to prevent damage and promote longevity. Additionally, it features automatic voltage regulation, which maintains a stable arc even under varying input voltage conditions.

In summary, the Lincoln Electric SVM187-A is a versatile, efficient, and user-friendly welding machine suited for both professional and industrial applications. Its multifunctionality, inverter technology, and robust safety features set it apart from competitors, making it a reliable choice for welders seeking to elevate their craftsmanship while ensuring safety and efficiency. This machine represents the innovation and quality that Lincoln Electric is renowned for in the welding industry.
Top Page Image Contents