Ac Waveshape; Spot Time Control (Reconfigured Rmt 2T Hold Output Selection) - Miller Dynasty 200 SD Owner's Manual

5-13. AC Waveshape

5-14. Spot Time Control (Reconfigured RMT 2T HOLD Output Selection)

SPO
3
1
1.0
1
2
3
Turn encoder (see Section 5-2) to
2
set appropriate value for active AC
Waveshape parameter. Value se-
lected is shown on the ammeter
(see Section 5-4).
See Section 5-16 for all AC Wave-
shape parameter ranges.
Balance: AC Balance Control is
enabled only if AC TIG process is
selected. Use control to set per-
centage of time polarity is electrode
negative.
Application:
When welding on oxide forming ma-
terials such as aluminum or magne-
sium, excess cleaning is not neces-
sary. To produce a good weld, only
a minimal amount, approximately a
0.10 in (2.5mm) of etched zone
along the weld toes is required.
Joint configuration, set-up, process
1
variables, and oxide thickness may
affect setting.
AC Frequency: AC Frequency
Control is enabled only if AC Polar-
ity process is selected. Use control
to set AC frequency (cycles per
second).
Application:
AC frequency controls bead width
and directional control. As AC fre-
quency decreases, weld bead/
puddle gets wider. As AC frequency
increases, weld bead/puddle be-
comes narrower and the arc be-
comes more focused. Travel speed
can increase as AC frequency in-
creases.
1
Select Spot function according to
Section 6-3C.
3
2
Or
3
Set spot parameters as follows:
Press Amperage switch pad once
(meter A LED turns on) and turn En-
coder to set spot amperage. Press
Amperage switch pad again, (meter
S LED lights) and turn Encoder to
set spot time (.1−25 seconds). Fac-
tory default setting is 1 second.
Application: To provide a timed
weld. Used for tacking, and thin
sheet joining.
Or
2
AC Waveshape
Encoder Control
Ammeter
Spot Time Meter Display
Amperage Switch Pad
Encoder Control
OM-2240 Page 33