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F-52

TROUBLESHOOTING AND REPAIR

F-52

SHUNT FIELD CIRCUIT VOLTAGE TEST (continued)

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PROCEDURE

1.Turn the engine off.

2.Open both of the doors on the control panel end of the SAE-400 machine. The roof may need to be removed on some models.

WARNING: Secure the doors in the open position using the door restraint system. If the machine does not have a door restraint system, remove the doors or securely restrain them to prevent them from falling closed.

3.Place the rheostat in the maximum position and ver- ify that the polarity switch is either the positive or negative position. It must not be in the neutral posi- tion.

4.Place the remote/local switch in the local position.

5.Place the idle switch in the high idle position, start the engine and allow it to stabilize at high idle RPM.

6.Locate the 500 Ohm/50 Watt resistor located on the back of the control panel, just below the 115 VAC duplex receptacle, and measure the voltage across it. The voltage should measure about 140 VDC.

If the measured voltage is normal, but there is still no usable output from the welding generator, perform the Shunt Field Coil Resistance and Ground Test.

If the correct voltage is not present at the 500 Ohm resistor, check for voltage at the positive and negative terminals of the D2 bridge rectifier.

If about 140 VDC is present at the D2 bridge rectifier, check the wiring between the rectifier, the polarity switch and the 500 Ohm resistor. If the wiring and con- nections are all good, the polarity switch may be faulty.

If the voltage is not present at the DC terminals of the D2 rectifier, check for approximately 125 VAC at the AC terminals of the D2 rectifier. If this AC voltage is pre- sent, replace the D2 rectifier.

If AC voltage is not present, check the remote/local switch, the P8 harness plug and receptacle. Check all the wiring and connections between the D2 and the D1 rectifiers. See the wiring diagram.

7. Check the Rheostat.

SAE-400 SEVERE DUTY

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Lincoln Electric SVM187-A service manual Shunt Field Circuit Voltage Test
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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.

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.
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