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

6-2. Meter Functions For CC/CV Models

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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

6-3. Lift-Arc TIG Procedure For CC/CV Models

.
Actual Volts (OCV)
Actual Volts (OCV)
Actual Volts (OCV)
Flashes OCV And Preset Volts
1
1 − 2
"Touch"
Seconds
Do NOT Strike Like A Match!
A complete Parts List is available at www.MillerWelds.com
Meter Reading At Idle
V A
78.0 85
Preset Amps
V A
8.0 85
Actual Volts Preset Amps
V A
78.0 85
Preset Amps
V A
85
Blank Preset Amps
V A
24.5
Preset Volts Blank
V A
85
Blank Preset Amps
V A
78.0 85
Preset Amps
V A
78.0
Blank
With Mode switch in the Lift-Arc TIG
position, start an arc as follows:
1 TIG Electrode
2
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 25