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Section E-1 Section E-1
LINCOLN
®
ELECTRIC
IDEALARC DC-400
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
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
FAN
115VAC
42VAC
14 PIN
AMPHENOL
REMOTE
CONTROL
TO
CONTROL
BOARD
CONTROL BOARD
OUTPUT
CONTROL
ARC FORCE
CONTROL
CONTROL
TRANSFORMER
POWER
SWITCH
R
E
C
O
N
N
E
C
T
INPUT
CONTACTOR
T
E
R
M
I
N
A
L
S
T
R
I
P
TRANSFORMER
MAIN
SCR DIODE
HYBRIDBRIDGE
/
PART
OF
MODE
SWITCH
CAPACITORS
SHUNT
REED
SWITCH
START
BOARD
PART
OF
MODE
SWITCH
OUTPUT
CHOKE
NEGATIVE
OUTPUT
TERMINAL
POSITIVE
OUTPUT
TERMINAL
PART OF
MODE
SWITCH
OUTPUT
G
A
T
E
S
I
G
N
A
L
S
FEEDBACK
F
E
E
D
B
A
C
K
FIGURE E.1 – IDEALARC DC-400 BLOCK LOGIC DIAGRAM