Lincoln Electric TIG 375 Advanced Panel Controls, Do not USE 4-STEP if Using AN Amptrol Remote

B-6 OPERATION B-6

8.DIGITAL METER AND DISPLAY SWITCH– A (3- digit) LED meter is used to monitor the preset and actual welding procedure based on the Display (momentary) switch position:

•Before welding with Display switch in center (normal) position, the digital meter displays the preset welding amps set by Maximum Output control knob (See Item 6). If in Stick mode using REMOTE (See Item 5.), the digital meter displays the preset welding amps set by the Remote control. (See Item 11)

•While welding with Display switch in center (normal) position, the digital meter displays the actual welding amps with one amp resolution (XXX) and accuracy within 4%+/-2A of reading.

•Any time in TIG mode and while pressing the Display switch to left, the digital meter displays the amps pre- set by the Minimum Output control knob (See Item 7).

•Any time in Stick mode and while pressing the Display switch to left, the digital meter displays the minimum amps rating of the machine (See Item 7).

•Any time, in either mode, while pressing the Display switch right to Volts position, the digital meter displays actual output volts. Volts is displayed with 0.1 volt res- olution (XX.X) and accuracy within 3%+/-1V of read- ing.

•While pressing the (Menu) button when not welding (see Menu Button and Display Button in previous section), for Meter and Display switch functions.

9.POSTFLOW TIME – This knob is used to set the TIG mode shielding gas postflow time over the range of about 2 to 60 seconds after the arc is shut off. The postflow on time status is indicated by the Green panel light.

•Postflow Time is x2 extendable, if needed, by inter- nal control box selection. (See Internal Set Up Controls)

•Gas preflow time for TIG mode is factory set at 0.5 second, but shorter times are selectable with the

Menu Button. (See 7a.)

10.THERMAL SHUTDOWN LIGHT – This yellow LED panel light turns on if the machine output is shut- down because internal overheating has occurred, and turns off when the thermostat resets.

11.REMOTE RECEPTACLE – A 6-socket receptacle is provided for the connection of an Amptrol, or other, remote control: (See Figure B.2)

•When the Current Control Switch, (See Item 5), is in the REMOTE position the Amptrol, or other remote (10K pot), connected to the Remote receptacle con- trols the TIG or Stick mode output within the range preset by the Maximum and Minimum Output con- trols. (See Item 6 and Item 7, also 8 for meter dis- play)

•When the Current Control Switch is in either LOCAL or REMOTE positions the arc start switch functions when connected to the Remote receptacle.

	FIGURE B.2
	REMOTE RECEPTACLE*
	(Front View)
ARC START	REMOTE OUTPUT
SWITCH	CONTROL

C Max

D	B	10K ohm
E	A	Min

F

*For 18-12P Plug

(LECO S12020-27)

ADVANCED PANEL CONTROLS

The following Advanced Control Panel controls are standard on the Precision TIG 375: (Refer to Section B-10 Tig Weld Cycle Chart for graphic illustration of these TIG welding functions.)

12.TRIGGER SWITCH – This 2-position switch selects how the arc start switch ( connected to the above Remote receptacle) functions; in 2-Step or 4- Step mode:

CAUTION

•DO NOT USE 4-STEP IF USING AN AMPTROL REMOTE.

•Neither the arc start switch nor the output con- trol in the amptrol will function normally to shut off or control the out put. ONLY USE 2-STEP.

------------------------------------------------------------------------

•In 2-Step position the arc start switch functions the same as without the Advanced Panel:

1.Closing switch starts preflow, then a fixed (0.5 sec.) ramp time from Minimum (Start) setting level (See Item 7) to Weld setting.

2.Opening switch initiates Downslope ramp time setting (See Item 17), from Weld set- ting to Crater-fill level (See Item 7), which then stops the arc and initiates Postflow time (See Item 9).

Note: See Section B-7 for 2-Step operation during Downslope with Restart feature selected to be dis- abled, instead of enabled (as shipped).

PRECISION TIG 375