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Section E-1 Section E-1

IDEALARC R3R
TABLE OF CONTENTS
- THEORY OF OPERATION SECTION -

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

Optional Polarity Switch and Amptrol Circuits...........................................................................E-4

Protective Devices and Circuits..................................................................................................E-5

SCR Operation ............................................................................................................................E-6

CONTROL BOARD
OUTPUT
CONTROL
ARC FORCE
CONTROL
CONTROL
TRANSFORMER
POWER
SWITCH
R
E
C
O
N
N
E
C
T
INPUT
CONTACTOR TRANSFORMER
MAIN SCR DIODE
HYBRIDBRIDGE
/SHUNT
OUTPUT
CHOKE
NEGATIVE
OUTPUT
TERMINAL
POSITIVE
OUTPUT
TERMINAL
G
A
T
E
S
I
G
N
A
L
S
FEEDBACK
F
E
E
D
B
A
C
K
THERMOSTATS
FAN
MOTOR
TERMINAL
STRIP
REMOTE
SWITCH
DIAL
SELECTOR
SWITCH
SNUBBER
BOARD
AMPHENOL
POLARITY
SWITCH
OPTIONAL
OPTIONAL
POCKET
AMPTROL
PC BOARD
OPTIONAL
POCKET
AMPTROL
TRANSFORMER

FIGURE E.1 – IDEALARC R3R BLOCK LOGIC DIAGRAM