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E-1 TABLE OF CONTENTS-THEORY OF OPERATION SECTION E-1
Theory of
General
Input Power
Output Rectification and Feedback
High Voltage/High Frequency
DC Welding
AC Welding
SCR
Protective
Thermal
Overload
FIGURE E.1 PRECISION TIG® 225 BLOCK LOGIC DIAGRAM
INPUT POWER
MAIN
TRANSFORMER
POLARITY SWITCH
BOARD
WORK |
ELECTRODE |
TRANSFORMER
SWITCH BYPASS ASBLY
H1
H2
H3
X1
X2
AC DC+
SCR
BRIDGE
AC DC-
SHUNT
F
E
E
D
B
A
C
K
C H O K E
HIGH VOLTAGE TRANSFORMER CIRCUIT
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| 18VAC |
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| 115VAC |
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| 18VAC | CONTROL | POWER | |
115 VAC |
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FAN |
| 115VAC | BOARD | "ON" | ||
| DIGITAL | |||||
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Receptacle |
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| DISPLAY |
Circuit Breaker |
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Protected |
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| MODE |
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| SWITCH |
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| REMOTE |
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| RECEPTACLE | THERMAL | GAS | THERMO- | OUTPUT |
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| STATS | |||
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| LIGHT | VALVE | CONTROL | |
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AUTO | PULSE TIG | STICK | AC | PULSE POSTFLOW |
BALANCE FREQ. LED | LED | BALANCE | CONTROL CONTROL | |
LED | LED |
| CONTROL |
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