Return to Master TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
THEORY OF OPERATION | ||||||||||||
GENERAL DESCRIPTION |
|
| 3. | Enhanced version of the patented MicroStartTM | ||||||||
|
|
|
|
|
| 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. |
| |||||||||
acclaimed Precision TIG family of industrial arc weld- |
|
|
|
|
|
|
|
| ||||
ing power sources. Premium features include: |
|
| 4. | |||||||||
|
|
|
|
| ||||||||
1. Precise constant current output. |
|
|
| starting and continuous AC TIG welding. |
| |||||||
2. Full range square wave AC/DC TIG (GTAW) weld- | 5. AC/DC Stick (SMAW capability.) |
| ||||||||||
| ing. |
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
| |
|
| FIGURE E.2 Main Transformer and Input Power |
| |||||||||
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
| BOARD |
| |||
|
|
|
|
| POLARITY |
|
|
|
| WORK |
| |
|
|
|
|
|
|
|
|
|
|
| ||
|
| MAIN |
|
| SWITCH |
|
|
|
| ELECTRODE |
| |
|
|
|
|
|
|
|
|
|
|
| ||
|
| TRANSFORMER |
|
|
|
|
|
|
| TRANSFORMER |
| |
|
| INPUT |
|
|
|
|
|
|
|
|
|
|
|
| POWER |
|
|
|
|
|
|
|
|
|
|
|
| SWITCH BYPASS |
|
|
|
|
| C |
| |||
|
| ASBLY |
|
|
|
|
|
| ||||
|
|
|
|
|
|
| H |
| ||||
|
| H1 |
| X1 | AC | DC+ |
| O |
| |||
|
|
|
|
| K |
| ||||||
|
|
|
|
| SCR |
|
| |||||
|
|
|
|
|
| E |
| |||||
|
|
|
|
| BRIDGE |
|
| |||||
|
| H2 |
| X2 |
|
| SHUNT |
|
| HIGH VOLTAGE |
| |
|
|
|
|
|
|
|
|
| ||||
|
|
|
| AC | DC- |
|
| TRANSFORMER |
| |||
|
| H3 |
|
|
|
|
|
| ||||
|
|
|
|
|
| F |
|
| CIRCUIT |
| ||
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
| E |
|
|
|
|
|
|
|
|
|
|
|
| E |
|
|
|
|
|
|
|
|
|
|
|
| D |
|
|
|
|
|
|
|
|
|
|
|
| B |
|
|
|
|
|
|
|
|
|
|
|
| A |
|
|
|
|
|
|
|
|
|
|
|
| C |
|
|
|
|
|
|
|
|
|
|
|
| K |
|
|
|
|
|
|
|
|
| 18VAC |
|
|
|
| 115VAC |
| ||
|
|
|
| 18VAC |
| CONTROL |
|
|
| POWER |
| |
|
|
|
|
|
|
|
|
|
|
|
| |
|
| FAN | 115VAC |
| BOARD |
|
|
| "ON" |
| ||
|
|
|
|
|
| DIGITAL |
| |||||
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
| DISPLAY |
|
|
|
|
|
|
|
|
|
|
|
| MODE |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
| SWITCH |
|
|
| REMOTE |
|
|
|
| THERMO- |
|
|
|
|
|
|
| RECEPTACLE |
|
| THERMAL | GAS | OUTPUT |
| ||||
|
|
|
|
| STATS |
| ||||||
|
|
|
|
| LIGHT | VALVE | CONTROL |
| ||||
|
|
|
|
|
|
| ||||||
AUTO | PULSE TIG STICK | AC | PULSE POSTFLOW | |
BALANCE FREQ. LED LED | BALANCE CONTROL CONTROL | |||
LED | LED | CONTROL |
| |
INPUT POWER CIRCUIT |
| incorporated in the main transformer. The 115VAC | ||
|
| 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. |
| |||
input power switch. When the input power switch is |
| |||
|
| |||
turned “ON” the input voltage is applied directly to the |
|
| ||
primary of the main transformer. |
|
|
| |
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.