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Return to Master TOC
THEORY OF OPERATION | ||||||||||||
GENERAL DESCRIPTION |
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| 3. | Enhanced version of the patented MicroStartTM | ||||||||
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| Technology for its lower Minimum (5amps) to high- | ||||||
The PRECISION TIG 185 is a member of our field |
| er Maximum (185 amps) output control range. |
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acclaimed Precision TIG family of industrial arc weld- |
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ing power sources. Premium features include: |
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1. Precise constant current output. |
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| starting and continuous AC TIG welding. |
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2. Full range square wave AC/DC TIG (GTAW) weld- | 5. AC/DC Stick (SMAW capability.) |
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| FIGURE E.2 Main Transformer and Input Power |
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| BOARD |
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| POLARITY |
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| WORK |
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| MAIN |
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| SWITCH |
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| ELECTRODE |
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| TRANSFORMER |
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| TRANSFORMER |
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| INPUT |
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| POWER |
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| SWITCH BYPASS |
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| ASBLY |
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| H |
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| H1 |
| X1 | AC | DC+ |
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| SCR |
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| BRIDGE |
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| H2 |
| X2 |
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| SHUNT |
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| HIGH VOLTAGE |
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| AC | DC- |
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| TRANSFORMER |
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| A |
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| 18VAC |
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| 115VAC |
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| 18VAC |
| CONTROL |
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| FAN | 115VAC |
| BOARD |
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| "ON" |
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| DIGITAL |
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| DISPLAY |
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| MODE |
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| SWITCH |
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| REMOTE |
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| THERMO- |
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| RECEPTACLE |
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| 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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INPUT POWER CIRCUIT |
| incorporated in the main transformer. The 115VAC | ||
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| winding supplies power to the fan motor and also, | ||
The desired | through the control board, | powers the gas solenoid | ||
valve and the high voltage transformer. The 18VAC | ||||
the TIG 185 through an input power switch located in | ||||
winding provides power to the trigger circuitry. The | ||||
the front panel of the machine. The machine can be | ||||
other 18VAC winding is rectified and regulated to a | ||||
configured for either 230VAC or 208VAC input voltage | ||||
15VDC supply which operates the circuitry on the con- | ||||
by connecting the appropriate lead (H2 or H3) to the | ||||
trol board. |
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input power switch. When the input power switch is |
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turned “ON” the input voltage is applied directly to the |
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primary of the main transformer. |
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The main transformer changes the high voltage, low current input power to a low voltage, high current out- put which is available at the main secondary winding (X1 and X2). In addition three auxiliary windings are
NOTE: Unshaded areas of block logic diagrams are the subject of discussion.
