Miller 907684001, Owner'S Manual

Page: 41 / 92

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A complete Parts List is available at www.MillerWelds.com
OM-270536 Page 33
6-2. Accessing Control Panel Menu: AC TIG
247222-D
1 Menu Button
Press Menu button to cycle through
parameters that can be set.
2
Parameter Display
3 Setting Display
4 Amperage Adjustment Control
Rotate amperage adjustment control
to adjust parameter setting.
.
Parameter automatically returns
to amperage setting 15 seconds
after amperage adjustment con-
trol is inactive.
1
AUTO
120H
75% BAL
FREQ
POST
150A
2
3 4
[BAL] Balance Control:* (% EN)
Controls Oxide Cleaning
Increasing setting reduces oxide cleaning. Range is
60 to 80%. (See tips below)
[FREQ]* Frequency Control:
Increasing setting narrows arc width. Range is 70 to
150 Hertz. (See tips below)
[POST] Post Flow Control:
Controls the length of time gas flows after welding
stops. Range is AUTO, OFF − 50T (seconds).
AUTO calculates the time based on the maximum
amperage of each welding cycle. The minimum time
is 8 seconds. Auto = maximum amperage/10.
* PRO − SET provides PROfessionally de-
veloped SETtings for the weld process.
To use PRO − SET, press the menu button
to display the parameter and adjust the
amperage adjustment control until PRO −
SET flashes on the display. PRO − SET
flashes one time and reveals the profes-
sional setting for the parameter.
TIP: AC Balance controls the cleaning
action. If floating black spots appear in
the puddle, the balance setting is too high.
Turn the balance down until puddle be-
comes clear.
TIP: AC Frequency controls the width of
the arc cone. For thin fillet welds (less
than 1/4 in.) set the frequency to 120 Hz.
This frequency setting provides a focused
stable arc and produces a narrow weld.
For outside corner or groove welds on
heavy material, a wide weld may be re-
quired. Lower the frequency to between
70 and100 Hz. This frequency setting pro-
duces a wider weld.
Amperage Control:
Controls the average AC welding
amperage output. Limits the maxim-
um output of a remote amperage
device.