Theory Of Operation Section; Block Logic Diagram - Lincoln Electric Idealarc DC600 9773MSP Service Manual

- THEORY OF OPERATION SECTION -

THEORY OF OPERATION SECTION ................................ Section E
Power Supply Operation ..................................................E-2 - E-5
Input Line Voltage, Connector and Main Transformer .........E-2
Output, Rectification,Control and Feedback ........................E-3
Protection Devices and Circuits (Contactor Hold-In) ...........E-4
SCR Operation ..........................................................................E-5
CONTROL
TRANSFORMER PROTECTION
DEVICES &
CIRCUTS
115 VAC
( )
CONTACTOR
HOLD-IN
MAIN
TRANSFORMER
R
E
C
O
N
N
E
C
T
CONTACTOR
TERMINAL
STRIP
REMOTE
TO
CONTROL
CONTROL
BOARD
TABLE OF CONTENTS
115 VAC
FAULT PROTECTION
FIRING BOARD
SCR BRIDGE
1
1
5
V
A
C
CHOKE
FAN
FIGURE E.1 Block Logic Diagram
Section E-1
OUTPUT
CONTROL
MODE
SWITCH
CONTROL
BOARD
F
E
E
PILOT
D
RELAY
B
A
POSITIVE
C
TERMINAL
K
F
SHUNT E
E
PILOT
D
RELAY
B
A
C
K
LATCHING
RESISTOR
NEGATIVE
TERMINAL
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IDEALARC DC-600