• Fdp (Double pulse)
The display G shows the abbreviation Fdp (double pulse
frequency).
The display Q reads OFF.
Press the O key to select the working frequency (adjust-
ment from 0.5 to 5 Hz).
The selected value is shown on the display Q.
Once the Fdp working frequency has been adjusted,
pressing the torch trigger will cause the following to
appear:
- ddP (difference in meters/minute of the double pulse).
Turn the knob Q to select the meters per minute (range
from 0.1 to 3m/min) that will be added to and subtract-
ed from the reference speed (default 1m/min ).
The selected value is shown on the display Q.
- bdP
This is the duration of the highest wire speed, thus the
highest current. It is expressed as a percentage of the
time gained from the Fdp frequency (see figure 3).
Press the O key to adjust the percentage.
Range between 25 and 75% (default 50%).
DdP= 0,1÷3 m/min
tdP
= 25÷75% di
T
= 1/
Fdp
(0,5÷5 Hz)
- AdP (arc length of the highest current).
Press the O key to adjust from –9.9 to 9.9 (default 0).
When welding, check that the arc length is the same for
both currents; press the O key to correct it if necessary.
Note: it is possible to weld within the double pulse func-
tions.
Should it be necessary to adjust the arc length of the
lowest current/lowest speed, adjust the arc length of the
reference speed.
When the reference speed moves, the above settings
must also be adjusted for the new speed.
• H20 (cooling unit).
The display G reads H2O.
Press the O key to select the type of operation:
OF = off.
ON = always on.
Au = automatic start-up.
When the machine starts, the unit is running. The unit
shuts off automatically If welding does not begin within
R e f e r e n c e
speed
T
Fig. 3
15 seconds. If welding begins, the unit starts operating
and shuts off 3 minutes after the torch trigger is
released.
If the coolant pressure is too low, the power source
delivers no current and on the display G will flash the
message H2O.
6 SAVING AND CALLING UP MEMORIES
Ten memory slots are available, from P01 to P10.
• To save, weld a small section using the parameters you
wish to save, then:
-Press the key R and, holding it down, press the key
O until the flashing abbreviation P01 appears on the
display G, then release the buttons.
NOTE: The flashing abbreviation indicates free
programs, those that do not flash are saved pro-
grams. Display Q indicates the number of the pro-
gram to which that saved welding program refers.
-Use the keys O and R to choose the program num-
ber to save, then press the key O until the program
abbreviation no longer flashes.
-Release the key O to exit saving.
-Should you intend to overwrite a program, when the
button O is held down for longer than 3 sec, the num-
ber starts flashing, then returns to steady mode to
signal overwriting.
Overwriting must take place while the display G
shows the program number (5 sec).
• To call up a saved program, repeat the same steps
described above
(keys R and O held down until the abbreviation PXX
appears); the last program saved appears. Five seconds
after the last time the keys R and O are pressed, the
machine is ready to weld.
Before welding with a saved program, display G shows its
number. When welding begins display G shows the current,
and when it ends LED A lights. All knobs are disabled.
To see the setting of the service function related to the saved
program, press the key R and hold it down; after 2 sec. the
display G shows the first message dSP. Pressing the torch
trigger will display the abbreviations of the various functions
in sequence, and display Q shows the setting.
To return to welding with a saved program, release the
key R.
To exit saved programs, press the key R and, while hold-
ing it down, briefly press and release the key O.
7 MAINTENANCE
• Safety gas nozzle
This nozzle must be periodically cleaned to remove splat-
tered metal. Replace if distorted or squashed.
• Contact tip.
Only a good contact between this contact tip and the wire
can ensure a stable arc and optimum current output; you
must therefore observe the following precautions:
A) The contact tip hole must be kept free of grime and
oxidation.
B) Splattered metal sticks more easily after long welding
sessions, blocking the wire flow.
15