E-3

E-3

THEORY OF OPERATION

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

INPUT VOLTAGE AND PRECHARGE

The Power Wave 455M can be connected for a variety of three-phase input voltages. Refer to Figure E.2. The initial input power is applied to the Power Wave 455M through a line switch located on the front of the machine. Two phases of the three-phase input power are applied to the Input Board and both auxiliary trans- formers. The various secondary voltages developed by transformer T1 are applied to the Input Board, the fan motor (via a control relay) and the Bus Board recti- fier. The 65VDC produced from the Bus Board rectifi- er is used by the Bus Board to provide various DC volt- ages for the Power Board, the Feed Head Board and the wire feeder receptacle. The 115/230VAC devel- oped on the secondary of auxiliary transformer T2 is applied to the 115VAC receptacle and to the water cooler receptacle.

The two phases that are connected to the Input Board, through the input line switch SW1, are connected to the input rectifier through the CR1 precharge relay. During

the precharge or "soft start" sequence, these two phas- es are current limited by the Input Board. The AC input voltage is rectified, and the resultant DC voltage is applied through the reconnect switches to the input capacitors located on the right and left switch boards. The Control Board monitors the voltage across the capacitors. When the capacitors have charged to an acceptable level, the Control Board signals the Input Board to energize the main input contactor, making all three phases of input power, without current limiting, available to the input capacitors. At this point the Power Wave 455M is in the "Run Mode" of operation. If the capacitors become undervoltaged, overvoltaged, or unbalanced, the Control Board will signal the Input Board to de-energize the main input contactor, and the Power Wave 455M will be disabled. See Figure E.2.

Return to Section TOC

Return to Master TOC

POWER WAVE 455M/MSTT

Page 37
Image 37
Lincoln Electric SVM173-A service manual Input Voltage and Precharge

SVM173-A specifications

The Lincoln Electric SVM173-A is a highly regarded welding power supply that stands out for its advanced features, robust performance, and innovative technologies. This machine is specifically designed to meet the demands of both industrial and commercial welding applications, making it a versatile choice for professionals.

One of the main features of the SVM173-A is its high efficiency, which contributes to reduced energy costs and enhanced productivity. The device operates on a powerful DC output, ensuring stable and reliable arc performance. This is particularly beneficial when working with various materials, allowing for smooth and consistent welds.

The SVM173-A leverages Lincoln Electric's proprietary inverter technology. This innovation allows for a lighter weight and more compact design without compromising on power. The inverter technology also enables precise control of the welding parameters, which is critical for maintaining quality across different welding tasks. Additionally, the machine features a wide input voltage range, accommodating various power sources and enhancing its adaptability on job sites.

Another key characteristic of the SVM173-A is its user-friendly interface. The machine is equipped with an intuitive control panel that allows users to easily adjust settings, making it accessible for both novice and experienced welders. The digital display provides clear readouts of output parameters and error notifications, facilitating quick troubleshooting in the field.

Safety is paramount in welding operations, and the SVM173-A incorporates several protection features. These include overcurrent protection, overheating protection, and circuit protection, ensuring that the machine operates safely and efficiently under various conditions.

The SVM173-A also supports a wide range of welding processes, including MIG, TIG, and stick welding. This flexibility makes it an ideal choice for workshops that require a multi-process machine capable of handling diverse applications. Furthermore, the SVM173-A supports spool gun operation, which is particularly useful for aluminum welding, enhancing its versatility even further.

In summary, the Lincoln Electric SVM173-A is a powerful and adaptable welding machine that combines innovative technologies, user-friendly features, and robust safety mechanisms. Its high efficiency, precision control, and multi-process capabilities make it an excellent investment for professionals seeking reliable performance in demanding environments. Whether for heavy-duty industrial use or more specialized applications, the SVM173-A stands as a testament to Lincoln Electric's commitment to quality and innovation in welding solutions.