Lincoln Electric SVM105-B service manual Theory of Operation Section, Section E-1

Models: SVM105-B

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Section E-1

TABLE OF CONTENTS

Section E-1

Master TOC

 

 

- THEORY OF OPERATION SECTION -

 

 

 

 

 

 

 

Theory of Operation

Section E

 

to

 

 

 

 

 

Return

 

 

Power Supply Operation

E-2

 

 

 

 

 

 

Pre Charge and Protection Circuitry

E-3

 

 

 

Switch Board and Main Transformer

E-4

 

 

 

Control and Output Circuitry

E-5

 

 

 

Field Effect Transistor (FET) Operation

E-6

 

 

 

Pulse Width Modulation

E-7

 

 

 

Protective Circuits

E-8

Return to Master TOC

 

 

FIGURE E.1 – V300-PRO BLOCK LOGIC DIAGRAM

 

 

 

 

 

 

 

 

 

 

 

 

 

POWER SWITCH

 

 

 

 

 

 

 

 

 

 

 

SECTIONS

 

MAIN

 

RECTIFIER

 

 

 

 

 

 

 

20KHZ

 

 

CHOKE

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

HEATSINK

 

 

 

 

 

 

LEFT SWITCH BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FET MODULES

 

TOP

 

 

 

TOC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CAP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 DIODE

 

 

 

 

 

 

FET MODULES

CURRENT

 

 

 

 

Master

 

 

1ø OR 3ø DETETCTION (H5)

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRE-CHARGE

 

 

 

 

 

 

 

 

 

 

LINE

INPUT

DRIVER

 

 

 

 

 

 

 

 

to

 

SWITCH

RECTIFIER

BOARD

 

 

 

CONTROL

 

 

5 DIODES

 

 

 

 

CR1

 

 

 

 

 

 

 

1

 

AC1

PROTECTION

 

BOARD

 

 

 

 

Return

 

PULSE

 

 

 

 

 

 

2

 

AC2

BOARD

 

Y-Y FEEDBACK

BOTTOM

 

 

 

 

TRAIN

 

 

 

 

 

3

 

AC3

 

 

 

 

 

 

 

 

 

3A

CR2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A-LEAD

 

 

 

 

 

 

 

 

 

 

 

 

24VDC

PRE-CHARGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAN

AUXILIARY

 

 

RIGHT SWITCH BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

5 DIODES

 

 

TRANSFORMER

 

2ND STEP PWM

 

 

 

 

 

 

 

 

 

18VAC

 

FET MODULES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POWERBOARD

 

CAP

 

 

 

 

 

 

 

 

 

24VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TOP

 

 

 

 

 

 

 

 

 

FET MODULES

 

 

 

 

 

 

 

 

<1 VDC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 DIODE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TO

 

 

 

 

 

 

 

CHOKE

 

CHOKE

 

 

WIREFEEDER

 

 

 

 

 

 

 

 

 

 

TOC

 

 

 

LOCAL

METER

MODE

POT

POT

VOLTAGE FEEDBACK

 

 

 

 

 

REMOTE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1ST STEP PWM VOLTAGE

 

 

CURRENT FEEDBACK-PROTECTION

SHUNT

 

 

 

15VDC-CONTROL BOARD FUNCTION VOLTAGE

 

 

 

 

 

 

 

 

 

 

 

 

MastertoReturn

 

 

 

24VAC-THERMOSTATS-GUN TRIGGERING

 

 

 

 

 

 

 

 

 

 

 

V300-PRO

 

 

 

 

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Lincoln Electric SVM105-B service manual Theory of Operation Section, Section E-1

SVM105-B specifications

The Lincoln Electric SVM105-B is a state-of-the-art welding machine that represents a leap forward in welding technology, designed for both professionals and enthusiasts in the welding industry. This versatile machine combines robust performance with user-friendly features, making it suitable for a wide range of welding applications.

One of the key features of the SVM105-B is its advanced inverter technology. This allows for a lightweight design without compromising on power output. The inverter technology ensures a stable arc and precise control, enabling consistent weld quality across various materials, including mild steel, stainless steel, and aluminum. This feature is particularly beneficial for users who demand exceptional performance in both thin and thick materials.

The SVM105-B also boasts an impressive output range, typically between 10A to 105A, allowing for adaptability to different welding tasks. Its ability to seamlessly switch between DC and AC modes makes it an ideal choice for professionals working in diverse environments, facilitating operations such as TIG and stick welding. This versatility is further enhanced by its compatibility with various electrode types, ensuring a more efficient and effective welding process.

User safety and comfort have not been overlooked in the design of the SVM105-B. Equipped with an efficient cooling system, this machine effectively manages heat during prolonged use, ensuring durability and longevity. Additionally, its intuitive digital display provides real-time feedback on settings, making it easier for users to monitor parameters and make necessary adjustments on the fly.

The SVM105-B is built with portability in mind. Its compact and lightweight design makes it easy to transport, enabling welders to bring their equipment to job sites without hassle. Furthermore, the machine features sturdy handles that contribute to its ease of maneuverability, supporting the demands of both inside workshops and outdoor projects.

Moreover, Lincoln Electric places a strong emphasis on quality and reliability, and the SVM105-B is a testament to this commitment. The machine is constructed from durable materials designed to withstand the rigors of daily use, ensuring it remains a staple in any welder's toolkit for years to come.

In conclusion, the Lincoln Electric SVM105-B stands out with its combination of advanced inverter technology, versatile output, user-friendly interface, and robust construction. Whether for professional or hobbyist use, this welding machine meets a wide array of welding needs while providing excellent performance and durability.