Controls And Settings - Lincoln Electric PRECISION TIG 275 Operator's Manual

®
PRECISION TIG 275

CONTROLS AND SETTINGS

The Front Control Panel contains the knobs and switches necessary for adjusting the operation of the Precision TIG
indicator lights and an electronic display for volts and amps. The components are described below:
3
4
1
2
1. POWER SWITCH - Input line switch turns input power ON or
OFF, as indicated by the on or off status of the front panel dis-
plays.
2. POLARITY SWITCH – The 3-position rotary power switch has
detente positions for DC-, AC and DC+ selections for the
Electrode output welding polarity.
3. MODE SWITCH – The mode switch allows vertically posi-
tioned selection of the two machine welding modes. The
selected mode is indicated by a lit colored panel light which
permits viewing the machine setting from a distance:
3.a STICK mode (Top position) –Red panel light
ELECTRIC SHOCK can kill.
• When the Power Source is ON in STICK
mode the Electrode circuits of both the
Stick and TIG torch cables are electrically
HOT to Work.
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FIGURE B.1 - CONTROL PANEL
8
7 7a
12 13
14
STICK
(Shown without hinged stud cover.)
WARNING
9
5
6
15 16 17
WORK
• The CC Stick mode may be used for general purpose stick
welding (SMAW ) within the capacity of the machine. The
capacity is too limited for arc air carbon (AAC) gouging.
• In this mode; the output terminals are activated electrically
HOT, gas flow is not activated and HOT START and ARC
FORCE levels are fixed, or Advanced Panel selectable (See
Internal Set Up controls), with no front panel adjustment.
3.b TIG mode (Bottom position) – No panel light.
• When the Polarity Switch is set to AC, the TIG mode provides
continuous high frequency to stabilize the arc for AC TIG
welding.
Hi-Freq. turns on after preflow time with the arc start switch
closure, and turns off when the arc goes out* after the arc
start switch opens.
* Arc voltage and current are sensed to determine if the arc is
established or out.
B 2
OPERATION
® 275, with function
1. POWER SWITCH
2. POLARITY SWITCH
3. MODE SWITCH
4. AC BALANCE CONTROL
5. LOCAL/REMOTE CURRENT CONTROL SWITCH
6. MAXIMUM OUTPUT CONTROL
7. MINIMUM OUTPUT CONTROL AND DISPLAY
SWITCH
7a. MENU BUTTON AND DISPLAY SWITCH
8. DIGITAL METER AND DISPLAY SWITCH
9. POSTFLOW TIME
10. THERMAL SHUTDOWN LIGHT
9
11. REMOTE RECEPTACLE
12. TRIGGER SWITCH
13. PULSE / SPOT MODE SWITCH
14. PULSE FREQUENCY CONTROL
15. PULSE % ON TIME CONTROL
10
16. PULSE BACKGROUND CURRENT CONTROL
17. DOWNSLOPE TIME
11