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Section E-1Section E-1

TABLE OF CONTENTS

-THEORY OF OPERATION SECTION-

Theory of Operation

Section E

General Description

E-2

Input Line Voltage, Contactor and Main Transformer

E-2

Output Mode and Control, Rectification and Feedback

E-3

Protective Devices and Circuits

E-4

SCR Operation

E-5

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CONTROL

TRANSFORMER

POWER

 

 

 

SWITCH

 

 

MAIN

 

 

 

 

 

TRANSFORMER

 

 

R

 

 

 

E

 

 

 

C

 

 

 

O

 

 

 

N

 

 

 

N

 

 

 

E

 

 

 

C

 

 

 

T

 

INPUT

 

 

 

CONTACTOR

 

 

 

 

 

T

115VAC

 

REMOTE

E

S

TO

CONTROL

R

T

CONTROL

 

M

R

BOARD

 

I

I

 

 

N

 

 

P

 

 

A

 

 

L

 

 

 

 

FAN

 

 

 

42VAC

 

 

14 PIN

 

 

AMPHENOL

OUTPUT

ARC FORCE

 

 

 

CONTROL

CONTROL

 

 

 

 

PART OF

 

 

 

 

MODE

 

 

 

 

SWITCH

 

 

 

 

 

 

FEEDBACK

 

CONTROL BOARD

 

 

NEGATIVE

 

 

 

 

OUTPUT

G

S

 

PART

TERMINAL

 

 

A

I

 

OF

 

T

G

 

MODE

 

 

SWITCH

 

E

N

 

 

 

 

 

 

A

 

 

 

 

L

 

 

 

 

S

 

 

OUTPUT

 

 

 

 

 

 

 

 

CHOKE

 

 

F

 

 

 

PART

E

 

 

 

OF

E

 

 

 

MODE

D

 

 

 

SWITCH

B

START

 

 

 

A

 

 

 

BOARD

 

 

 

C

 

 

 

 

 

 

OUTPUT

K

 

 

 

 

 

 

 

CAPACITORS

 

 

 

 

 

 

 

POSITIVE

 

 

 

 

OUTPUT

 

 

 

 

TERMINAL

SCR / DIODE

SHUNT

REED

 

SWITCH

 

 

 

HYBRID BRIDGE

 

 

 

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FIGURE E.1 – IDEALARC DC-400 BLOCK LOGIC DIAGRAM

IDEALARC DC-400

LINCOLN ®

ELECTRIC

Page 40
Image 40
Lincoln Electric SVM 122-A service manual Table of Contents Theory of Operation Section