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E-2

E-2

THEORY OF OPERATION

FIGURE E.2 – INPUT VOLTAGE CIRCUIT

SURGE

NOISE

FILTER

INPUT

CONTACTOR

R E C O N N E C

T T2

CONTROL

TRANSFORMER

THERMOSTAT SWITCH

CONTROL

BOX

RECTIFIER

CONTACTOR

VAC 120

FAN VOLTAGE

T1

MAIN

TRANSFORMER

SCR OUTPUT RECTIFIER

 

 

 

SHUNT

 

 

 

TO CONTROL

 

 

 

BOARD

 

 

 

GATE SIGNALS

32 VAC

32 VAC

32 VAC

 

 

 

RESISTOR

FIRING

 

 

BANK

BOARD

WORK

TERMINAL

FILTER

CAPACITOR

LIMITING

RESISTOR

ELECTRODE

TERMINAL

TO CONTROL

BOARD

Return

Return

CONTROL

 

 

BOARD

 

CONTROL

FAN

THERMOSTAT

SIGNAL

G Y

W

 

DIGITAL

 

 

METER

LED LED LED

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GENERAL DESCRIPTION

The Multi-Source is designed to supply power to the Multi-Weld Arc Converter welders. The Multi-Source is an SCR controlled constant voltage (CV) DC power supply that can operate with a wide range of three phase input voltages. The machine's peak output voltage helps regulate against wide variations in out- put loading and/or variations in input line voltages. This ability provides for a consistently high stable volt- age applied to the Multi-Welds so as to provide good manual electrode welding capability.

has a single primary-to-secondary ratio (no taps) that spans the full input range up to 600VAC. The sec- ondary voltage developed on the secondary of the control transformer is applied to the control box full wave bridge rectifier via a thermostat and the input power switch. The input contactor , which is activat- ed and controlled by the control board, applies the three phase AC input voltage to the primary windings of the T1 main transformer.

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INPUT VOLTAGE, FILTER, CONTAC-

TOR AND CONTROL TRANS-

FORMER

The desired three phase power is connected to the Multi-Source via a reconnect panel located in the input box at the rear of the machine. The reconnect panel allows the user to configure the machine for the desired input voltage. The three phase input power is also applied to a filter assembly that is located in the input box. Two phases of the input voltage are applied to the T2 control transformer. The control transformer

NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

MULTI-SOURCE

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Lincoln Electric SVM155-A service manual General Description, Input VOLTAGE, FILTER, Contac TOR and Control Trans Former

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.