Miller Electric SHOPMATE 300 DX, Owner'S Manual

Page: 24 / 32

OM-225 757 Page 20
4-2. Meter Functions
.
The meters display the actual weld output values for approximately three seconds after the arc is broken.
Mode Meter Reading At Idle
Lift-Arc TIG
(GTAW)
V A
Actual Volts Preset Amps
8.0 85
TIG (GTAW)
Blank Preset Amps
V A
85
MIG (GMAW)
Preset Volts Blank
V A
24.5
Panel Control
SMAW
Actual Volts (OCV) Preset Amps
V A
80.0 85
4-3. Lift-Arc TIG Procedure
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