B-8
OPERATION
AC Waveshape
This switch allows the operator to customize the arc
performance for TIG welding in AC polarity only.
Individual descriptions are below.
1. AC AUTO BALANCE
®
: (Refer to instructions to
activate AC AUTO BALANCE
®
below). While
illuminated, the machine determines AC Balance, EP,
and EN current values automatically based on user
adjusted output amperage setting. The AC frequency
may be changed while leaving AUTO ON. In order to
make changes to AC Balance, EP, and/or EN current
values, AUTO must first be switched OFF. (See Figure
B.12 and B.12a)
2. AC Frequency: This function controls the frequency of
the AC wave in cycles per second. Adjustable from
40-400 Hz. (See Figure B.13)
3. AC Balance: AC balance controls the amount of time,
as a percentage, that the polarity is electrode
negative. (See Figure B.14) (35-99%)
4. Electrode Positive (EP) / Electrode Negative (EN)
Amperage: Allows the operator to adjust the positive
and negative amplitude values of the AC wave. (See
Figure B.15)
EN, EP and balance settings are all tied to the overall
amperage setting of the machine. If the overall welding
current is changed, the EN to EP ratio is maintained, but
their individual values change with output.
Example: If EN is set to 180 Amps, EP is set to 120 Amps,
and Balance is 75%, the displayed welding
current will be 165 Amps. If the welding current
is now adjusted to 220 Amps, balance will
remain at 75%, but EN will change to 240 Amps
and EP to 160 Amps (3:2 ratio maintained).
A
AVG
= EN(%BAL) + EP(1-%BAL)
ASPECT™ 375
1
2
3
4
FIGURE B.12
FIGURE B.13
FIGURE B.14
FIGURE B.15
ON
AUTO
Instructions to activate or deactivate the “AC Auto Balance
®
”
setting:
Select the AC Wave Shape button until the “Auto” icon
blinks, at which point “AC Auto Balance” can be turned on
or off by rotating the main control knob.
FIGURE B.12a
