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B-7
OPERATION
SQUARE WAVE TIG 255
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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.
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
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.
7. CONTROL PANEL: The display is divided into five
sections. See Figures B.2.a and B.2.b.
FIGURE B.2.a - DISPLAY
A. AC/DC INDICATOR D. MOMENTARY DISPLAY
B. VOLTMETER E. BAR GRAPH
C. AMMETER
FIGURE B.2.b - DISPLAY
A
B
C
D
E
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.
FIGURE B.3 - CASE FRONT CONTROLS
1. POWER SWITCH
2. THERMOSTATIC
PROTECTION LIGHT
3. POLARITY SWITCH
DC
DC
AC
O
I
POWER
WARNING
ELECTRODE
WORK
GAS
IN
OUT
WATER
IN
OUT
DO NOT SWITCH
WHILE WELDING
L9119-1
L9119-2
REMOTE
1
2
3