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F-25

F-25

TROUBLESHOOTING & REPAIR

WIRE DRIVE MOTOR AND TACHOMETER FEEDBACK TEST (continued)

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TEST FOR SUPPLY VOLTAGE TO TACHOMETER AND FEEDBACK VOLTAGE

1.Locate the following leads on Plug J84. Leads 841 (1J84) and 844 (4J84)

2.Make the following voltage tests. From the table below.

3.Turn the machine OFF between each test.

4.Carefully insert the meter probes into the back of each Molex plug pin cavity. This is the tach supply voltage.

FROM LEAD

TO LEAD

EXPECTED VOLTAGE

841 +

844 -

5 VDC

(1J84)

(4J84)

 

5.If the 5 VDC is present, go to next step. If no volt- age is measured Feeder Head Board may be bad. Check connections back to Feed Head Board.

6.Locate the leads on Plug J84 noted in the table below.

7.Carefully insert the meter probes into the back of each Molex plug pin cavity

8.Turn the machine ON and pull the gun trigger to conduct the voltage test.

9.If the 1.5 to 3.5 VDC is present, the tachometer circuit is sending the correct feedback signal to the Feeder Board. Replace the Feeder Board.

FROM LEAD

TO LEAD

EXPECTED VOLTAGE

847 +

844 -

 

(7J84)

(4J84)

1.5 to 3.5 VDC

 

 

 

10.If the 1.5 to 3.5 VDC is not present or not correct, the Feeder Board is not receiving the proper feed- back voltage from the tachometer circuit. Check the leads from the tachometer circuit to the Feeder Board for loose or broken connections.

11.If the leads are okay, the tachometer circuit may be faulty, replace the tach Sensor.

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POWER MIG 300

Page 69
Image 69
Lincoln Electric SVM160-B service manual Test for Supply Voltage to Tachometer and Feedback Voltage

SVM160-B specifications

The Lincoln Electric SVM160-B is a standout model in the realm of portable arc welders, designed specifically for light to medium-duty welding tasks. As part of Lincoln Electric’s renowned line of welding equipment, the SVM160-B combines efficiency with durability, catering to both professional welders and hobbyists alike.

One of the primary features of the SVM160-B is its lightweight and compact design. Weighing in at just around 60 pounds, it offers excellent portability, allowing users to easily transport the unit to various job sites. This mobility is enhanced by an integrated handle and a rugged construction, making it suitable for both indoor and outdoor applications.

The SVM160-B utilizes advanced inverter technology, which significantly enhances its performance capabilities. This technology not only contributes to the welder's energy efficiency but also allows for a more stable arc, reducing spatter and resulting in cleaner welds. The machine can operate on both 120V and 240V power sources, providing flexibility for users to adapt to different settings and requirements.

Among its key characteristics, the SVM160-B features a welding output range that accommodates various welding needs, allowing users to achieve welds from 20 to 160 amps. This versatility makes it ideal for welding different materials, including mild steel, stainless steel, and aluminum. Furthermore, the unit supports a range of welding processes, including MIG, stick, and TIG welding, enhancing its adaptability for various projects.

Another highlight of the SVM160-B is its user-friendly interface. The control panel is designed to facilitate ease of use, with clearly marked dials and indicators that enable quick adjustments of settings. This intuitive design ensures that both novice and experienced users can operate the machine efficiently and effectively.

Safety features are also a crucial aspect of the SVM160-B. It comes equipped with thermal overload protection, which prevents the unit from overheating during extended use. This built-in safeguard extends the welder's lifespan and enhances user safety.

In summary, the Lincoln Electric SVM160-B is a versatile, portable welder that combines advanced technology with user-friendly features, making it an excellent choice for a wide range of welding applications. Its lightweight design, inverter technology, and robust safety features make it a reliable option for both professionals and enthusiasts. Whether tackling small repairs or larger projects, the SVM160-B stands ready to deliver quality results.