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E-5E-5

TROUBLESHOOTING & REPAIR

PROTECTION DEVICES AND CIR-

CUITS

Several thermostats protect the Multi-Source from over temperature and /or excessive loading. High transformer watts could cause the main transformer to over heat so the cooling fan is activated if a thermo- stat, located on the front of the main transformer iron, should open.

Two additional thermostats (connected in series) pro- tect the machine in case of fan failure or blocked air- flow at normal output loads. The opening of either the secondary or SCR heat sink thermostat(s) will disable the machine's output and cause the amber thermal light to glow.

The thermostat, located at the rear of the main trans- former iron, senses the lamination temperature (and thus the coil insulation temperature) and will interrupt power to the control board causing the input contac- tor to open until the iron cools.

A 10 amp circuit breaker protects the 120VAC fan cir- cuit. This is located on the front panel of the machine and may be reset if tripped.

An independent safety circuit on the control board monitors the output voltage peaks and opens the input contactor if the upper limit is exceeded for over 300 ms.

If the output current of the machine should exceed the set limitations the control board will disable output for about 75 seconds.

MULTI-SOURCE

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Lincoln Electric SVM155-A service manual Protection Devices and CIR Cuits

SVM155-A specifications

The Lincoln Electric SVM155-A is a state-of-the-art welding machine that excels in versatility and performance, making it ideal for both professional welders and hobbyists. This multi-process welder supports MIG, TIG, and stick welding processes, allowing users to tackle a wide range of applications with a single device. Its user-friendly design and advanced technology make it an exceptional choice for those looking to enhance their welding capabilities.

One of the main features of the SVM155-A is its robust power output, which can handle welding materials ranging from thin sheets to heavier stock. The welder offers a high duty cycle, ensuring that users can work efficiently without the need for prolonged breaks. This is especially important in industrial settings where productivity is key. Additionally, the SVM155-A is equipped with a digital display that allows for easy monitoring and precise control of the welding parameters, ensuring consistency in weld quality.

The European-designed INVERTER technology embedded in the SVM155-A significantly contributes to its lightweight and compact design. Weighing in at only 19.4 lbs, this welder is portable and ideal for fieldwork or workshops where space is limited. The inverter technology not only reduces the size and weight but also improves energy efficiency, leading to lower operational costs over time.

The SVM155-A also features advanced safety mechanisms, including over-current protection to safeguard the machine from potential damage during excessive use. It also includes a thermal overload shut-off, which prevents overheating, ensuring a longer lifespan for the welder.

Another standout characteristic of the SVM155-A is its exceptional arc stability and ease of use. The machine is designed to provide a smooth and consistent arc, reducing spatter and ensuring clean welds. Moreover, the welder is compatible with a wide range of materials, including stainless steel, aluminum, and carbon steel, further enhancing its versatility.

In conclusion, the Lincoln Electric SVM155-A is a powerful, durable, and multifunctional welding machine that incorporates advanced technologies to meet the needs of modern welding applications. Its portability, safety features, and ability to deliver high-quality welds make it an excellent investment for anyone looking to improve their welding skills or expand their capabilities in various welding projects.