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F-36

TROUBLESHOOTING AND REPAIR

F-36

EXCITER ROTOR RESISTANCE AND GROUND TEST (Exciter / Auxiliary Power Alternator) (continued)

FIGURE F.10 – SLIP RING LOCATIONS

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VOLTMETER LEADS

BRUSHES

NEGATIVE

SLIP RING

PROCEDURE (continued)

“Dynamic” Tests:

(Also referred to as flying resistance test)

This test checks for faults in the rotor winding, while these windings are being stressed by the mechanical forces encountered during normal operation.

NOTE: This test is best performed with a good quality analog type ohmmeter. Many digital meters will not provide stable or accurate resistance read- ings while the rotor is spinning.

This test requires that the brushes and slip rings are clean, in good condition, and are properly seated.

Perform the Brush and Slip Ring Service Procedure.

1.Insulate the lead wires that had been disconnected from the brushes during the static rotor resistance test. Position and secure them so they cannot become damaged by the spinning rotor.

It is recommended that the ohmmeter leads be secure- ly attached to the brush terminals, using clips or termi- nals BEFORE starting the engine. See Figure F.10.

BRUSH HOLDER ASSEMBLY

POSITIVE

SLIP RING

2.Start the engine and run it at high idle speed (1800 RPM). The resistance should read approximately 42 ohms* at 77 deg. F. (25 deg. C).

3.Shut off engine, and move one of the ohmmeter leads to a good clean chassis ground connection.

4.Restart the engine and run it at high idle speed (1800 RPM). The resistance should be very high, at least 500,000 (500k) ohms.

5.If the resistance readings differ significantly from the values indicated, re-check the brushes and the brush spring tension. If the brushes and slip rings are good, replace the rotor.

6.Securely connect the leads to the brush terminals (see wiring Diagram) and replace the alternator covers if testing and service is complete.

*NOTE: The resistance of the copper windings will change with temperature. Higher tempera- tures will produce higher resistance, and lower temperatures will produce lower resistance.

SAE-400 SEVERE DUTY

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Lincoln Electric SVM187-A service manual Figure F.10 Slip Ring Locations, Dynamic Tests
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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.

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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.

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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.
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