Thermal Arc 180 AC, User Manual

Page: 24 / 36

Notice NOT 034
THERMAL ARC 180 AC/DC
Rev : 00
Date : 03/12/02
USING
USER’S MANUAL
Page
2 4/36
Frequency adjustment
The frequency is the number of periods per second. T
AC
= T
D
+T
P
. F
AC
=1/ T
AC
in Hz.
When F26 ON and F27 OFF, press the setting key F16 , adjust the frequency with the potentiometer
F9 .
The value (in Hz) can be read on the display F5 .
When the potentiometer is at the minimum, the frequency is 20 Hz, and at the maximum, the
frequency is 250 Hz.
High frequencies allow arc concentration and reduce the area affected by the arc on the workpiece.
The frequency is pre-adjusted at 100 Hz.
Release the key when your setting is finished.
Balance adjustment
This adjustment has an effect upon the proportion of positive current in the arc.
The balance is T
D
/ (T
D
+T
P
) in %.
Penetration : The negative halfcycle (T
P
) is longer than the positive (T
D
). You need a lower welding
current which allows :
•
less heating of the tungsten electrode, which allows longer time between electrode grinding.
•
reduction of the affected area on the workpiece
Use for clean workpiece only.
Cleaning : The positive alternating (T
D
) is longer than the negative one (T
P
), which heat the tungsten
electrode and means :
•
higher welding current
•
more important tungsten electrode diameter
•
electrode’s rounded so the arc is less directional
•
larger affected area on the workpiece
Use for dirty workpiece only.
When F26 ON and F27 OFF, press the setting key F17 , adjust the balance with the potentiometer F9 .
The value (in % of cleaning ratio) can be read on the display F5 .
Release the key when your setting is finished.