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THEORY OF OPERATION
WIRE-MATIC 255
Figure E.1 -Block Logic Diagram
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
THEORY OF OPERATION SECTION ...................... Section E
Power Supply Operation .................................................E-1
Input Line Voltage and Main Transformer...................E-1
Output Rectification and Feedback Control ................E-2
Constant Voltage Output .............................................E-3
Wire Drive Motor and Feedback .................................E-4
Thermal Protection...........................................................E-5
SCR Operation.................................................................E-6
TABLE OF CONTENTS
- THEORY OF OPERATION SECTION -
LINE
SWITCH
MAIN
TRANSFORMER
RECONNECT
FAN
MOTORS
SCR
RECTIFIER
C
A
P
A
C
I
T
O
R
S
SHUNT
CHOKE
WIRE
DRIVE
MOTOR
TACH
POSITIVE
TERMINAL
NEGATIVE
TERMINAL
GAS
SOLENOID
WIRE
SPEED
ARC
VOLTAGE
CONTROL BOARD
FEEDBACK
GUN TRIGGER AND THUMB SWITCH
F
E
E
D
B
A
C
K
G
A
T
E
I
G
N
S
A
L