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Section e - theory of operation – Lincoln Electric POWER MIG SVM157-A User Manual

Page 29

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TABLE OF CONTENTS

- THEORY OF OPERATION SECTION -

POWER MIG 200

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section E

Input Power Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-2

Input Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-2

Main Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-2

Voltage Selector Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-2

Baffle Mounted Diode Bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-2

Control Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-3

Output Rectification, Contactor & Control Boards . . . . . . . . . . . . . .

E-3

Optional Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-4

Control Board, Gun Trigger, & Wire Drive Motor . . . . . . . . . . . . . . .

E-4

Protective Devices & Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-5

Thermal Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-5

Wirefeed Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E-5

Section E

Section E

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FIGURE E.1 THEORY OF OPERATION BLOCK DIAGRAM

LINE
SWITCH

RECONNECT
PANEL

FAN
MOTOR

RECTIFIER
DIODE
BRIDGE

CONTROL BOARD

GAS
SOLENOID

WIRE
SPEED
CONTROL

WIRE
DRIVE
MOTOR

TACH

FEEDBACK

GUN TRIGGER

+

-

OUTPUT DIODE
BRIDGE

+

-

NEGATIVE
TERMINAL

CONTACTOR

CONT

ACT

OR

CONTROL

TAP SELECTOR
SWITCH

OUTPUT
CHOKE

POSITIVE
TERMINAL

TRANSFORMER
THERMOSTAT

OUTPUT BRIDGE
THERMOSTAT

28 V

AC

MAIN
TRANSFORMER

OUTPUT
CAPACITORS

GUN
ASSEMBLY