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OPERATION |
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• | When the Polarity Switch is set to DC (- or +), the |
| • With the Current Control switch to REMOTE posi- | |||
| TIG mode provides high frequency only for starting. |
| tion, this knob sets the maximum welding level that | |||
• |
| the Peak output can be set with the remote Amptrol. | ||||
| • The new MicroStart |
| Technology minimum current | |||
| start switch closure, and turns off when the arc is |
| TM | |||
| established* |
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| circuit provides for low end welding (down to 2 | ||
• | DC+ polarity can also be used for ”balling” of the |
| amps) previously unobtainable on an SCR platform | |||
| TIG machine. |
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| tungsten for AC TIG welding. | The potentiometer | 7. MINIMUM OUTPUT CONTROL AND DISPLAY SWITCH– | |||
4. AC BALANCE ONTROL – |
| A smaller knob is used to preset the minimum cur- | ||||
| control permits AC wave balance adjustment from |
| rent level only for TIG mode. Pressing the Display | |||
| Max. Penetration (~85% negative wave) with the |
| (momentary) switch toggle left to Minimum Set posi- | |||
| control at Max. full CW position, to Max. Cleaning |
| tion displays the Minimum control level setting on the | |||
| (~65% positive wave) with the control set near min- |
| Digital meter. (See Item 8) | |||
| imum CCW position. | the Auto Balance |
| • This knob sets the Start output level. When the arc | ||
• Full minimum CCW position is |
| lights (using a new | ||||
| position which is indicated by the Green panel light |
| upslopes quickly (0.5 sec.w/ Advanced Panel, zero | |||
| turning on. This feature automatically provides the |
| w/o) and smoothly to the weld output level. The set- | |||
| proper amount of cleaning and penetration for nor- |
| ting range for this Start control is the 2 amp mini- | |||
| mal AC TIG welding |
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| mum range of the machine up to about 50 amps, but | ||
• The mid position is the Balanced position (~50% |
| no more than the level set by the Maximum Output | ||||
| control knob (See Item 6), but otherwise is indepen- | |||||
| positive and negative waves). |
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| dent of the Maximum setting. | ||
• The Balance control is only functional if the machine |
| • This setting also serves as the | ||||
| is set to AC polarity and TIG mode. |
| with a Precision TIG Advanced Panel it can be | |||
5. LOCAL/REMOTE CURRENT CONTROL SWITCH – A |
| selected (see Section | ||||
| Output control setting (same as Start setting) as | |||||
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| shipped, or the minimum rating of the machine (2 | ||||
| controlled for both Stick and TIG Modes: |
| amps). |
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• LOCAL (Top position) selects output control only by |
| • The Remote Amptrol range of control is between | ||||
| the machine panel Output Control. (See Item 6) |
| this Minimum setting and the Maximum Output con- | |||
• REMOTE (Bottom position) selects output control to |
| trol knob setting, so these knobs can set the resolu- | ||||
| tion of the Amptrol. Also, the Minimum setting | |||||
| also be by an Amptrol (See Item 6), or other remote |
| serves as both the minimum Amptrol start level | |||
| (10K pot) control connected to the Remote recepta- |
| when the arc start switch is closed, as well as the | |||
| cle (See Item 11) This switch selection is indicated |
| minimum Amptrol | |||
| by the Green panel light turning on. | . | switch is opened to help prevent premature arc out | |||
In either position the arc start switch functions when | and | |||||
connected to the Remote receptacle (See Item 11). |
| • In STICK mode the Start control is not functional | ||||
6. MAXIMUM OUTPUT CONTROL – The large knob |
| since Hot Start level is fixed, or internal Advanced | ||||
| Panel adjustable (see Section | |||||
| is used to set the output welding current over the |
| Display (momentary) switch toggle left to Minimum | |||
| rated output range of the machine. |
| Output position displays minimum amps rating of | |||
• With the Current Control switch to LOCAL position, |
| the machine. |
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| this knob sets the welding output level. |
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PRECISION TIG 275
