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E-8

E-8

 

THEORY OF OPERATION

 

THERMAL PROTECTION

OVER CURRENT PROTECTION

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Two normally closed (NC) thermostats protect the machine from excessive operating temperatures. These thermostats are wired in series and are con- nected to the Weld Control board. One of the ther- mostats is located on the Chopper Assembly board, and one is on the secondary of the Main Transformer. Excessive temperatures may be caused by a lack of cooling air or by operating the machine beyond its duty cycle or output rating. If excessive operating tempera- tures should occur, the thermostats will prevent output from the machine. The yellow thermal light, located on the front of the machine, will be illuminated. The ther- mostats are self resetting once the machine cools suf- ficiently. If the thermostat shutdown was caused by excessive output or duty cycle and the fan is operating normally, the power switch may be left on and the reset should occur within a 15-minute period. If the fan is not turning or the intake air louvers are obstructed, the power must be removed from the machine and the fan condition or air obstruction corrected. The cooling fan runs only when necessary. The F.A.N. (fan as needed) system is controlled by the Weld Control Board via solid state relay.

If the average current exceeds 300 to 320 amps, the peak current will be limited to 100 amps until the sys- tem is re-triggered or the average current decreases to under 50 amps.

WIRE FEEDER OVERLOAD PRO- TECTION

The Power MIG 300 wire drive motor has its own solid state overload protection. If the motor becomes over- loaded, the protection circuitry turns off the wire feed and the gas solenoid. Overload may result from improperly sized tip liner and drive rolls, obstructions or bends in the gun cable, and any other factors that would impede the wire feeding. To resume welding, simply pull the gun trigger. There is no circuit breaker to reset, as the protection is provided by reliable solid state electronics.

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POWER MIG 300

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Lincoln Electric SVM160-B service manual Thermal Protection Over Current Protection, Wire Feeder Overload PRO- Tection
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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.
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