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Section E-1 Section E-1
IDEALARC CV-400
Theory of Operation .............................................................................................................Section E
General Description...............................................................................................................E-1
Input Line Voltage, Contactor and Main Transformer ............................................................E-2
Output Control, Rectification and Feedback..........................................................................E-3
Protective Devices and Circuits.............................................................................................E-4
SCR Operation ......................................................................................................................E-5
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
GENERAL DESCRIPTION
The CV-400 is an SCR controlled three-phase DC
power source. It is designed for all open arc constant
voltage (CV) processes within the capacity of the
machine. The output characteristics have been opti-
mized for CV processes without the use of a variable
arc control. Minimum to maximum output is obtained
with a single potentiometer control.
FIGURE E.1 – BLOCK LOGIC DIAGRAM
FAN
115VAC
42VAC
REMOTE
CONTROL
TO
CONTROL
BOARD
CONTROL BOARD
OUTPUT
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
/
CAPACITORS
SHUNT
NEGATIVE
OUTPUT
TERMINAL
POSITIVE
OUTPUT
TERMINAL
OUTPUT
G
A
T
E
S
I
G
N
A
L
S
F
E
E
D
B
A
C
K
s
F
E
E
D
B
A
C
K
14 PIN AMPHENOL