E-3

E-3

THEORY OF OPERATION

Return to Section TOC

Section TOC

INPUT

 

LINE

INPUT

SWITCH

RECTIFIER

 

AIR

 

PRESSURE

 

SWITCH

 

"A"

POWER BOARD

 

 

 

 

 

 

 

 

 

CR 1&2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IGBT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CAPACITOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

IGBT

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

IGBT

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CURRENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I

 

 

 

 

 

 

CAPACITOR

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IGBT

 

 

 

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T

CR

1

& 2

 

 

IGBT

 

 

E

 

 

 

 

RELAY

 

 

 

 

C

 

 

GATE

 

 

DRIVE

 

 

 

 

T

 

SIGNALS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAIN

TRANSFORMER

TRIGGER & SAFETY

 

 

WORK

 

 

NOZZLE

 

ELECTRODE

 

 

 

TORCH

OUTPUT

BOARD

CONNECTOR

 

 

E

 

 

L

 

 

E

 

 

C

 

 

T

 

 

R

 

 

O

 

 

D

 

 

E

 

CHOKE

S

 

PILOT

O

 

L

TRANSISTOR

E

 

 

N

 

 

O

 

 

I

 

 

D

 

TRIGGER & SAFETY

 

 

AIR

 

 

SOLENOID

 

 

REMOTE

 

 

INTERFACE

 

 

RECEPTACLE

Return to Master TOC

Return to Master TOC

L

E

A

D

 

 

 

 

SIGNAL

 

 

 

 

 

 

I

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

 

N

SIGNAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROL BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18/36VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

A

T

S

 

 

 

 

 

 

E

I

H

A

 

 

 

 

 

 

R

E

F

 

 

THERMOSTATS

 

 

 

A

 

 

 

 

 

 

L

R

E

 

 

 

 

 

 

D

M

T

 

 

 

 

 

 

Y

O

A

Y

 

 

 

 

 

 

 

W

L

 

OUTPUT

CONTROL

DISPLAY BOARD

ELECTRODE & TRANSFER

CURRENT FEEDBACK

PILOT ENABLE

ELECTRODE SOLENOID ENABLE

AIR SOLENOID ENABLE

12VAC

24VAC

Section TOC

Master TOC

115VAC

AUXILIARY

TRANSFORMER FAN MOTOR

Return to

to Section TOC

Return to

to Master TOC

PRECHARGE AND PROTECTION

The input voltage is rectified by the input rectifier. The resultant DC voltage is applied, through the reconnect switch, to the power board. The power board contains precharging circuitry for the safe charging of the input filter capacitors. Once the capacitors are precharged and balanced the control board activates the CR1+ CR2 input relays. This connects full input power to the filter capacitors. When the filter capacitors are fully charged they act as power supplies for the IGBT switching circuit. The Insulated Gate Bipolar Tran- sistors supply the main transformer primary winding with DC current flow. See IGBT Operation discussion and diagrams in this section.

The power board also monitors the filter capacitors for voltage balance and under or overvoltage. If either should occur, the appropriate signal is sent to the con- trol board to deactivate the CR1+ CR2 input relay. The machine output will also be disabled.

Return

Return

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

PRO-CUT 80

Page 32 Page 34
Page 33
Image 33
Lincoln Electric SVM146-A service manual Precharge and Protection, Power Board
Page 32 Page 34

SVM146-A specifications

Lincoln Electric's SVM146-A is a versatile and powerful multi-process welding machine designed for professionals in various industries. Known for its robustness and reliability, this machine excels in both performance and user-friendly features, making it a popular choice among welders.

One of the standout features of the SVM146-A is its multi-process capability, allowing users to perform MIG, TIG, and stick welding using a single unit. This versatility is enhanced by Lincoln Electric's innovative Auto-Set technology, which automatically adjusts the machine's settings based on the selected process and materials being welded. This feature significantly reduces the time spent on setup and helps ensure optimal weld quality, even for less experienced operators.

The SVM146-A is powered by a reliable inverter design, which provides greater efficiency compared to traditional transformer-based machines. This compact and lightweight design allows for easy transport, making it ideal for job sites or remote locations. The inverter technology also contributes to enhanced arc stability and better overall performance, providing high-quality welds in less time.

Another key characteristic of this welding machine is its robust construction, designed to withstand the rigors of heavy industrial use. The SVM146-A features a durable chassis and control panel, ensuring longevity and reliability under challenging working conditions. Additionally, its intuitive interface allows users to easily navigate settings and make adjustments as needed.

Safety is a paramount concern in welding applications, and the SVM146-A is equipped with several safety features, including over-temperature and over-voltage protection, ensuring that the machine operates safely even in demanding environments. It also features a start inhibit system, preventing the machine from being started under unsafe conditions.

The SVM146-A is compatible with a variety of welding accessories and consumables, enhancing its flexibility and usability across different applications. Whether it’s automotive repair, heavy fabrication, or maintenance work, this welding machine adapts to various tasks, making it a valuable addition to any professional's toolkit.

In conclusion, Lincoln Electric's SVM146-A stands out as a multi-process welding machine that combines advanced technology, robust design, and user-friendly features. It is engineered for performance and reliability, making it an excellent investment for professionals dedicated to achieving high-quality welds.
Top Page Image Contents