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Section | TABLE OF CONTENTS | Section |
| - THEORY OF OPERATION SECTION - |
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Theory of Operation | Section E |
General Description | |
Input Power Circuit | |
Output Rectification and Feedback Control | |
High Voltage/High Frequency Circuit | |
DC Welding Output | |
AC Welding Output | |
SCR Operation | |
Protective Circuits | |
Thermal Protection | |
Overload Protection |
FIGURE E.1 – PRECISION TIG 185 BLOCK LOGIC DIAGRAM
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| BOARD |
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| POLARITY |
| WORK | |
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| SWITCH |
| ELECTRODE | |
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| MAIN |
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| TRANSFORMER |
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| TRANSFORMER |
INPUT |
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POWER |
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SWITCH BYPASS |
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| C | |
ASBLY |
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| H | |
| H1 |
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| AC | DC+ |
| O | |
| X1 |
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| K | |||
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| SCR |
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| BRIDGE |
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| H2 |
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| SHUNT | HIGH VOLTAGE |
| X2 |
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| AC | DC- | TRANSFORMER | ||
| H3 |
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| F | CIRCUIT | |
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| E |
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| E |
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| D |
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| B |
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| A |
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| C |
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| K |
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| 18VAC |
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| 115VAC |
| 18VAC |
| CONTROL | POWER | |
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FAN | 115VAC |
| BOARD | "ON" | |
| DIGITAL | ||||
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| DISPLAY |
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| MODE |
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| SWITCH |
| REMOTE |
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| THERMO- |
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| RECEPTACLE | THERMAL | GAS | 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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X