Lincoln Electric IDEALARC R3R-500 - Manual (Page 29)

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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
HYBRID BRIDGE
/ 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