Resetting; Limits To Changing Parameters; Energy Saving" Function; Aluminum Welding - CEA DIGISTAR 250 DUAL PULSED Manual De Instrucciones

LIMITS TO THE USE OF SEQUENCES
The use of sequences with the possibility of passing from one
automatic welding point to another while the welding is active is
only allowed:
• When the change of automatic welding point does not involve
a change in the welding process;
• When the process selected must be MIG/MAG or PULSED MIG
(therefore it is not possible to change the automatic welding
point during welding in DOUBLE PULSED MIG);
• When changing the automatic welding point does not involve a
change in the synergic curve used (therefore it is not possible
to pass, for example, from a memorized point beginning with
curve P4 to a memorized point beginning with curve P5);
• It is not possible to pass from one automatic welding point to
another if the WELDING MODES (2T, 4T, CRATER, POINTING
are not the same for both automatic points and if these are
different from 2T or 4T.

Resetting

Resetting to factory values must be divided in two parts. First of
all press and release the SPECIAL FUNCTIONS key to enter the
special functions. Then:
• Pressing the RUN/MEM button for 3 seconds shows the let-
ters STD flashing on the display: at the end of the flashing, by
letting go of the button the factory settings are restored for the
previously active welding programme only, except for the au-
tomatic points (which therefore remain memorised);
• Pressing the WORK TYPE button for 5 seconds shows the let-
ters RST flashing on the display: at the end of the flashing, by
letting go of the button the factory settings are restored and
the automatic welding spots are cancelled.
The wording STD and RST on the display means that the opera-
tion has been accepted. This is done when one of the keys are
released and is followed by the machine automatically starting
up again, so that the default settings are loaded and activated
straight away.
NOTE: The special parameters of all the welding programmes
are returned to their factory settings and the automatic welding
spots are cancelled.

Limits to changing parameters

The SPECIAL FUNCTIONS key must be pressed for 5 seconds
to set the machine to shutdown. At this point the machine pre-
sents an interface similar to the one for setting the special func-
tions parameters and specifically: required functions can be se-
lected by pressing the ENCODER 1 knob, while the parameters
of the latter can be set with the ENCODER 2 knob.
Parameters selectable with ENCODER 1 knob and viewed on
relevant dVPA display are:
• PASSWORD (viewed on the PAS display)
• SHUTDOWN LEVEL (displayed on the BLL display)
Values selectable with ENCODER 2 knob and viewed on relevant
dVPV display are:
• The password has three digit numbers with values ranging from
000 to 999.
• 0 = NO SHUTDOWN or MACHINE RELEASE
The machine is not blocked, this also makes it possible to free
it if had been previously blocked (after entering the correct
password).
• 1 = SHUTDOWN LEVEL 1 activated
The ENCODER 1 knob, ENCODER 2 knob or eventual remote
control can be used to adjust the value of the
PITCH TRMMING ADJUSTMENT, value of
and value of ELECTRONIC INDUCTANCE, both in SYNERGI-
CAL and MANUAL mode.
• 2 = SHUTDOWN LEVEL 2 activated
None of the welding parameters may be changed.
• 3 = SHUTDOWN LEVEL 3 activated
No weld parameters may be changed in SYNERGICAL and
MANUAL mode. In AUTOMATIC it is only possible to change
the WIRE SPEED, by a value of ±15% of the memorized value,
using the ENCODER 1 knob only. Eventual remote controls can
be used to scroll through the memorized automatic spots.
After setting the shutdown levels and the password (relevant value
and code must be entered the first time by the user) just press
the SPECIAL FUNCTIONS key once more to exit from the menu
and have the machine ready again for welding. The selections
remain memorized until they are changed again.
This function makes sure the cooling fan and coolant system are
working properly, these are only activated when strictly neces-
sary i.e.:
• FAN MOTOR
The fan is activated:
- During the welding phase or for a reasonable period of time
when welding has terminated;
- When the thermostat is active or for a reasonable period of
time when it has just restarted.
• COOLANT SYSTEM
The coolant system is activated:
- When the machine is switched on for one minute so that the
coolant liquid circulates in the system at the correct pres-
sure (call for technical assistance if the error messages do
not disappear from the displays when the coolant system
goes off);
- During the welding phase or for a suitable period of time
when the welding has terminated.
To weld with aluminum wire proceed as follows:
• Replace the drive rolls with special ones for aluminium wire
(see paragraph: "Assembly of wire-feed rolls for aluminium");
• Use a torch with a hollow of 3 m and sheath in plastic material;
• Set the pressure between the drive rolls at the minimum, by
turning the screw provided;
• Use argon gas at a pressure of 1.3 - 1.7 bar.
WARNING: Before carrying out any inspection of the inside of
the generator, disconnect the system from the supply.
DIGISTAR 250 PULSED
WARNING: It is very important to remove all dust sucked into the
machine by the fans, as the welders are completely electronic.
Proceed as described to keep the machine in good working or-
der:
• Periodic removal of accumulated dirt and dust from the inside
of the generator, using compressed air. Do not aim the air jet
directly onto the electrical components, in order to avoid dam-
aging them.
• Make periodical inspections in order to individuate worn cables
or loose connections that are the cause of overheating.
• Check, that the gas circuit is completely free from impurities
and that the connections are tight and that there are no leaks.
Carefully check that the electric valve does not leak.
• Check the wire feeder rolls periodically and replace them when
wear impairs the regular flow of the wire (slipping etc).
TORCH
The torch is subjected to high temperatures and is also stressed
by traction and torsion. We recommend not to twist the wire and
WELDING
not to use the torch to pull the welder. As a result of the above
WELD CURRENT
the torch will require frequent maintenance such as:
• cleaning welding splashes from the gas diffuser so that the gas
flows freely;
• substitution of the contact point when the hole is deformed;
• cleaning of the wire guide liner using trichloroethylene or spe-
cific solvents;
• check of the insulation and connections of the power cable;
• the connections must be in good electrical and mechanical
condition.
34

"ENERGY SAVING" function

Aluminum welding

Maintenance