Miller DYNASTY 350, Руководство пользователя

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OM-216 869 Page 50
5-13. AC Waveshape (Dynasty Models Only)
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1 AC Waveshape Control
Press switch pad until desired function LED is
illuminated.
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Encoder Control (Set Value)
3 Ammeter (Displays Value)
See Section 5-15 for all AC Waveshape param-
eter ranges.
EN Amperage [EN] - Use with AC TIG only to
select electrode negative amperage value.
EP Amperage [EP] - Use with AC TIG only to
select electrode positive amperage value.
Note: See Section 6-1 to set same Amplitude
control [ENEP].
EN Amperage and EP Amperage allow the op-
erator the ability to control the amount of am-
perage in the negative and positive half cycles
independently. A 1.5 to 1 ratio of EN to EP is a
good starting point. This provides cleaning ac-
tion, but directs more energy into the workpiece
and provides faster travel speeds and deeper
penetration.
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Amperage Control
Average Amperage Control: Setting EN Am-
perage, EP Amperage, Balance, and Frequen-
cy values creates an average amperage. The
operator can change the average amperage
value while maintaining the same EN amper-
age to EP amperage ratio at the existing bal-
ance and frequency. To change the average
amperage value, press the Amperage switch
pad and turn the Encoder control. The chang-
ing average value is displayed on the ammeter.
Example: If EN Amperage is 300, EP Amper-
age is 150, Balance is 60%, and Frequency is
120, the average amperage is 240 amps. If you
press the Amperage switch pad and turn the
Encoder control until 480 amps is displayed,
the EN amperage is now 600 and EP amper-
age is now 300. The balance remains 60%, and
the frequency is still 120, and the 2 to 1 EN am-
perage to EP amperage is maintained.
Balance [BAL] - AC Balance control is enabled
only in AC TIG to set percentage of time polarity
is electrode negative. Set control at about 75%,
and fine tune from there.
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Voltmeter
Displays word abbreviations of selected pa-
rameters.
Application:
When welding on oxide forming materials such
as aluminum or magnesium, excess cleaning
is not necessary. To produce a good weld, only
0.10 in (2.5mm) of etched zone along the weld
toes is required.
Use AC Balance to control the etch zone width.
Joint configuration, set-up, process variables,
and oxide thickness may affect setting.
AC Frequency [FREQ] - Use control to set AC
frequency (cycles per second).
Application:
AC Frequency controls arc width and direction-
al control. As AC frequency decreases, the arc
becomes wider and less focused, limiting di-
rectional control. As AC frequency increases,
the arc becomes narrower and more focused,
increasing directional control. Travel speed
can increase as AC frequency increases.
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