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E-5

THEORY OF OPERATION

E-5

 

 

 

 

 

 

FIGURE E-5 --OUTPUT & CONTROL CIRCUITS

 

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LINE

 

SWITCH

1

 

2

 

3

3A

 

FAN

AUXILIARY

TRANSFORMER

 

TO

WIREFEEDER

 

 

POWER SWITCH

 

 

 

 

 

 

SECTIONS

 

MAIN

 

RECTIFIER

 

 

20KHZ

 

CHOKE

 

 

 

TRANSFORMER

 

 

 

HEATSINK

 

 

LEFT SWITCH BOARD

 

 

 

 

 

 

 

 

 

 

 

FET MODULES

 

TOP

 

 

 

 

 

 

 

 

 

 

CAP

 

 

 

 

 

 

 

 

 

 

1 DIODE

 

 

FET MODULES

CURRENT

 

 

 

1˘ OR 3˘ DETETCTION (H5)

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

 

PRE-CHARGE

 

 

 

 

 

INPUT

DRIVER

 

 

 

 

 

RECTIFIER

BOARD

 

CONTROL

 

 

5 DIODES

 

CR1

 

 

 

 

 

 

BOARD

 

 

 

AC1

 

PROTECTION

 

 

 

PULSE

 

 

 

 

AC2

BOARD

Y-Y FEEDBACK

BOTTOM

 

 

TRAIN

 

 

AC3

 

 

 

 

 

CR2

 

 

 

 

 

 

 

 

 

 

 

A-LEAD

 

 

 

 

 

 

24VDC

PRE-CHARGE

 

 

 

 

 

 

 

 

 

 

 

 

 

RIGHT SWITCH BOARD

 

 

 

 

18VAC

2ND STEP PWM

FET MODULES

 

 

 

5 DIODES

 

 

 

 

 

 

 

 

 

 

 

 

POWERBOARD

CAP

 

 

 

 

24VAC

 

 

 

 

 

 

 

 

TOP

 

 

 

 

FET MODULES

 

 

 

 

 

 

 

 

 

 

 

<1 VDC

 

 

 

1 DIODE

 

 

 

 

 

 

 

 

 

 

CHOKE

LOCAL

METER

MODE POT

POT

VOLTAGE FEEDBACK

REMOTE

 

 

 

 

 

1ST STEP PWM VOLTAGE

 

CURRENT FEEDBACK-PROTECTION

15VDC-CONTROL BOARD FUNCTION VOLTAGE 24VAC-THERMOSTATS-GUN TRIGGERING

CHOKE

SHUNT

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OUTPUT AND CONTROL CIRCUITS

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The AC output of the transformer is changed to DC by the Output Rectifier. The Output Choke between the negative side of the rectifier and the negative output stud provides the necessary filtering for DC welding. The two smaller chokes and their series diodes are the OCV boost circuit used to help provide good weld starts.

Current feedback to the Control Board is provided by the shunt in the negative output circuit. It is used for weld control, overcurrent protection and actual amme- ter readings. The Voltage feedback lead at the positive output stud also provides information for weld control and actual voltmeter readings.

The Control Board monitors input from the front panel controls (output, arc control, mode switch, etc..). The software on the board processes these inputs, sets up the proper weld information and sends the “set” para- meter information to the meter.

When weld output is requested, the Control Board compares the input information to the feedback signals and provides the correct PWM signals to the Switch Boards for optimum welding. The Mode Switch setting determines which feedback signal (voltage or current) will have the most relevance. However, both signals are used in all modes.

The Control Board also monitors signals from the ther- mostats and the Protection Board and if necessary, shuts off the weld output. The protection circuit infor- mation is discussed in more detail later in this section.

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

V300-PRO

Page 27
Image 27
Lincoln Electric SVM105-B service manual Output and Control Circuits, FET Modules Current

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.

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