Miller DIMENSION NT 450 WCC, Owner'S Manual

Page: 29 / 44

OM-240 044 Page 25
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 Meter Reading At Idle
Scratch Start TIG
Actual Volts (OCV) Preset Amps
V A
78.0 85
Lift-Arc TIG
(GTAW)
V A
Actual Volts Preset Amps
8.0 85
Air Carbon Arc
V A
Actual Volts (OCV) Preset Amps
78.0 85
TIG (GTAW)
Blank Preset Amps
V A
85
MIG (GMAW)
Preset Volts Blank
V A
24.5
CC
Blank Preset Amps
V A
85
Stick (SMAW)
Actual Volts (OCV) Preset Amps
V A
78.0 85
Voltage-Sensing
Wirefeeder (WCC)
Flashes OCV And Preset Volts Blank
V A
78.0
5-3. Lift-Arc TIG Procedure For CC/CV Models
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.
1
1 − 2
Seconds
“Touch”
Do NOT Strike Like A Match!
2
Ref. S-156 279