Lincoln Electric IDEALARC CV-305 - Manual (Page 27)

TABLE OF CONTENTS-THEORY OF OPERATION SECTION E-1 E-1
IDEALARC® CV-305
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-1
Input Line Voltage, Line Switch & Main Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2
Output Rectification, Filtering, Control & Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3
SCR Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5
FIGURE E.1 — BLOCK LOGIC DIAGRAM.
INPUT
LINE
SWITCH
MAIN
TRANSFORMER
RECONNECT
PANEL
FAN
MOTOR
OUTPUT
RECTIFIER
+
SHUNT
CHOKE
OUTPUT
TERMINALS
CONTROL BOARD
F
E
E
D
B
A
C
K
G
A
T
E
S
METER
OUTPUT
CONTROL
14 PIN
AMPHENOL
TRIGGER AND REMOTE
12VAC
12VAC
4
2
V
A
C
-
CAPACITORS
+
F
E
E
D
B
A
C
K
-
-
115VAC
POWER FACTOR
ENHANCEMENT
CHOKE
Re
tu
rn
to
M
a
st
e
r
T
O
C
Re
tu
rn
to
M
a
st
e
r
T
O
C
Re
tu
rn
to
M
a
st
e
r
T
O
C
Re
tu
rn
to
M
a
st
e
r
T
O
C