Meter Functions For Cc/Cv Models; Lift-Arc Tig Procedure For Cc/Cv Models - Miller Electric Dimension NT 450, NT 500 Owner's Manual

5-2. Meter Functions For CC/CV Models

.
The meters display the actual weld output values for approximately three seconds after the arc is broken.
Mode
Scratch Start TIG
Lift-Arc TIG
(GTAW)
Air Carbon Arc
TIG (GTAW)
MIG (GMAW)
CC
Stick (SMAW)
Voltage-Sensing
Wirefeeder

5-3. Lift-Arc TIG Procedure For CC/CV Models

1
1 − 2
"Touch"
Seconds
Do NOT Strike Like A Match!
Meter Reading At Idle
V
78.0
Actual Volts (OCV)
V
8.0
Actual Volts
V
78.0
Actual Volts (OCV)
V
Blank
V
24.5
Preset Volts
V
Blank
V
78.0
Actual Volts (OCV)
V
78.0
Flashes OCV And Preset Volts
2
A
85
Preset Amps
A
85
Preset Amps
A
85
Preset Amps
A
85
Preset Amps
A
Blank
A
85
Preset Amps
A
85
Preset Amps
A
Blank
With Mode switch in the Lift-Arc TIG
position, start an arc as follows:
1 TIG Electrode
2 Workpiece
Touch tungsten electrode to work-
piece at weld start point, hold
electrode to workpiece for 1-2
seconds, and slowly lift electrode.
An arc will form when electrode is
lifted.
Normal open-circuit voltage is not
present before tungsten electrode
touches workpiece; only a low
sensing voltage is present between
electrode and workpiece. The
solid-state output contactor does
not energize until after electrode is
touching workpiece. This allows
electrode to touch workpiece with-
out overheating, sticking, or getting
contaminated.
Ref. S-156 279
OM-2252 Page 23