Section TOC

Master TOC

E-3

THEORY OF OPERATION

E-3

 

FIGURE E-3 ---PRECHARGE & PROTECTION CIRCUITS

 

Return to

Return to Section TOC

Return to

Return to Master TOC

1

2

3

FAN

LINE

SWITCH

3A

AUXILIARY

TRANSFORMER

TO

WIREFEEDER

POWER SWITCH SECTIONS 20KHZ

LEFT SWITCH BOARD

FET MODULES

 

 

 

CAP

 

 

 

 

FET MODULES

CURRENT

1ø OR 3ø DETETCTION (H5)

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

PRE-CHARGE

 

 

 

 

INPUT

DRIVER

 

 

 

 

RECTIFIER

BOARD

 

 

 

CONTROL

 

CR1

 

 

 

 

 

 

 

BOARD

AC1

 

PROTECTION

PULSE

 

AC2

BOARD

 

Y-Y FEEDBACK

TRAIN

 

AC3

 

 

 

 

CR2

 

 

 

 

 

 

 

 

 

A-LEAD

 

 

 

 

 

24VDC

PRE-CHARGE

 

 

 

 

 

 

 

 

 

 

 

RIGHT SWITCH BOARD

18VAC

2ND STEP PWM

 

FET MODULES

 

 

 

 

 

 

 

 

 

 

POWERBOARD

 

CAP

 

24VAC

 

 

 

 

 

 

 

 

 

 

<1 VDC

 

FET MODULES

 

 

 

 

 

 

 

LOCAL

METER

MODE

POT

POT

 

REMOTE

 

 

 

 

 

 

1ST STEP PWM VOLTAGE

 

 

 

15VDC-CONTROL BOARD FUNCTION VOLTAGE

 

 

24VAC-THERMOSTATS-GUN TRIGGERING

 

 

MAIN

CHOKE

RECTIFIER

TRANSFORMER

HEATSINK

 

 

TOP

 

 

 

 

1 DIODE

5 DIODES

BOTTOM

5 DIODES

TOP

1 DIODE

CHOKE

VOLTAGE FEEDBACK

CURRENT FEEDBACK-PROTECTION

CHOKE

SHUNT

TOC

TOC

PRECHARGE & PROTECTION CIRCUITS

The DC voltage from the Input Rectifier is applied to the Driver Board to begin charging the Switch Board capacitors at a slow rate. When the pre-charge level is achieved, the input relays close, applying the full DC voltage to the capacitors. Depending on the Code Number of the machine, there will be either two or four relays and they may or may not be mounted on the Driver Board.

The Driver Board is also responsible for gating the Field Effect Transistors (FETs) on the Switch Boards, as directed by the pulse width modulated (PWM) signal from the Control Board.

The Protection Board monitors the capacitors for prop- er balance and voltage level. If an imbalance or over- voltage condition is detected, the Protection Circuit will de-energize the relays, removing the power from the switch circuits. The machine output will also be dis- abled.

Another function of the Protection Board is to detect whether the input voltage is single phase or three phase and pass that information to the Control Board. The maximum output of the machine will be limited to approximately 250 amps with single phase input and 360 amps with 3 phase input.

Return

Return

NOTE: Unshaded areas of block logic diagram are the subject of discussion

V300-PRO

Page 25
Image 25
Lincoln Electric SVM105-B service manual Precharge & Protection Circuits, Return to Section To Section TOC

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.