OPERATION |
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7.CONTROL PANEL: The display is divided into five sections. See Figures B.2.a and B.2.b.
FIGURE B.2.a - DISPLAY
DC BA
E
A. AC/DC INDICATOR | D. MOMENTARY DISPLAY |
B. VOLTMETER | E. BAR GRAPH |
C. AMMETER |
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FIGURE B.2.b - DISPLAY
A.AC/DC INDICATOR: This symbol represents the output polarity of the 255 . . . either AC or DC. AC is shown in Figure B.2.a; DC is shown in Figure B.2.b.
and on the Momentary Display. When the Momentary Display is blank (as in Figure B.2.a), the Bar Graph Display represents values shown on the ammeter. When a low value is shown on the ammeter, only a few “bars” will appear on the left hand side of the Bar Graph Display. As the ammeter value increases, more and more “bars” will appear. Whenever a value increases, more and more “bars” will appear. Whenever a value appears in the Momentary Display, the Bar Graph Display will represent the Momentary Display value, not the ammeter value.
CASE FRONT CONTROLS
Refer to Figure B.3 for the location of the following controls:
1.POWER SWITCH: Controls the input power to the Square Wave TIG 255.
2.OVER TEMPERATURE LIGHT: A yellow light which only lights when an over temperature situation occurs. See the Maintenance Section for more information on the thermostatic protection.
3.POLARITY SWITCH: Selects DC+, AC or DC- welding polarity. DO NOT SWITCH UNDER
LOAD.
FIGURE B.3 - CASE FRONT CONTROLS
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B.VOLTMETER: This meter displays open circuit voltage as well as welding voltage, as measured on the output studs of the Square Wave TIG 255.
C.AMMETER: The ammeter can display preset current (for setting the welding current before welding) and actual welding current (the value of the welding current during a weld).
D.MOMENTARY DISPLAY: This area is blank under most conditions; see Figure B.2.a. Different val- ues may be displayed here as certain keypad keys are pressed. See Figure B.2.b; the TIG Pulser is being adjusted, so the Pulse Frequency, 2.0 Hz, is being displayed. Information in the Momentary Display lasts for five seconds after a key is pressed. Read the complete Operating Instructions section for more information on the values that appear in the Momentary Display.
E.BAR GRAPH DISPLAY: This area provides a graphical display of values shown on the Ammeter
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1.POWER SWITCH
2.THERMOSTATIC PROTECTION LIGHT
3.POLARITY SWITCH