Helpful Hints - Elettro 455 Manuel D'instructions

2.2. CUTTING MODE
Turn the knob to select the icon (Pict. 4 Ref. A), then select
the desired cutting mode.
2.2.1. Handheld cutting
Use the knob S1 to select the cutting current and utilize:
For item 455: a nozzle of diameter 1,10.
For items 457 and 459: a nozzle suitable to the selected
current.
Press the torch trigger to strike the pilot arc.
If cutting does not begin within 4 seconds, the pilot arc goes
out; press the trigger again to re-strike it.
Hold the torch upright while cutting.
When you have finished cutting and released the trigger, air
will continue to leave the torch for approximately 100
seconds to allow the torch to cool down.
It is advisable not to turn the machine off until this cool-
down period is complete.
Should you need to make holes or begin cutting from the
centre of the workpiece, you must hold the torch at an angle
and slowly straighten it so that the nozzle does not spray
molten metal (see pict. 2). This must be done when making
holes in pieces more than 3 mm thick.
When making circular cuts, we recommend to use the
special compass available upon request. It is important to
remember that using of the compass it could be necessary
to use the starting technique described above (see pict. 2).
Do not keep the pilot arc lit in the air when not needed, to
avoid unnecessary consumption of the electrode, swirl ring
or nozzle.
Turn the machine off when the work is completed.
2.2.2. Cutting with automatic restart
To cut perforated or grid metal, activate this special function
via the main menu. When you have finished cutting, if you
hold the push-button down the pilot arc will restart
automatically.
Use this function only if necessary to avoid unnecessary
wear on the electrode and nozzle.
2.2.3. Mechanized cutting
This new cutting mode takes advantage of a synergic
interface that helps the user to set the cutting parameters.
After selecting the above icon, select the kind (Pict. 4 Ref B)
and the thickness (Pict. 4 Ref. C) of the material to cut, the
machine will display automatically the corresponding values
of current (Pict. 4 Ref. G), nozzle (Pict. 4 Ref. F) and cutting
speed (Pict. 4 Ref. E).
Once made this operation, you can select and modify on
your discretion the suggested values of current and/or speed
and the machine will modify, in a synergic way, the other
value, following automatically the ideal cutting curve to
perform the type of machining required.
During automatic operation, for piercing (see pict. 3), start
with a distance between the nozzle and the workpiece
greater than the distance of the cut.
For thicknesses greater than
14 mm for art. 455
20 mm for art. 457
25 mm for art. 459
the material must be perforated before cutting.
2.2.4. Circular mechanized cutting
Selecting this cutting mode, it is possible to make circular
cuts, this function uses the synergic interface and, as
described previously, setting the thickness (Pict. 4 Ref. C)
and the kind (Pict. 4 Ref. B) of material, the power source
sets the corresponding values of current (Pict. 4 Ref. G),
nozzle (Pict. 4 Ref. F) and cutting speed (Pict. 4 Ref. E)
automatically (with a reduction of 40% to obtain quality cuts).
3. CUTTING PROBLEMS
3.1. INSUFFICIENT PENETRATION
This error may be caused by the following:
 high speed. Always make sure that the arc fully
penetrates the workpiece and is never held at a forward
angle of more than 10 - 15° . This will avoid incorrect
consumption of the nozzle and burns to the nozzle
holder.
 Excessively thick workpiece.
Grounding clamp not in good electrical contact with the

workpiece.
 Worn nozzle and electrode.
 Cutting current too low.
NOTE: When the arc does not penetrate, the molten metal
scraps obstruct the nozzle.
3.2. THE CUTTING ARC GOES OFF
This error may be caused by:
• worn nozzle, electrode or swirl ring
• air pressure too high
• supply voltage too low
3.3. SLANTED CUT
If the cut appears slanted, turn the machine off and replace
the nozzle.
When the cutting current is above 45 A, prevent the nozzle
from coming into electrical contact with the workpiece (even
through scraps of molten metal), this condition causes rapid
and at times instantaneous destruction of the nozzle hole,
leading to poor quality cutting.
3.4. EXCESSIVE WEAR ON CONSUMABLE PARTS
This problem may be caused by:
a) air pressure too low compared to the recommended level.
b) excessive burns on the end of the nozzle holder.

4. HELPFUL HINTS

 If the system air contains considerable amounts of
moisture and oil, it is best to use a drying filter to avoid
excessive oxidation and wear on consumer parts,
damage to the torch and a reduction in the speed and
quality of the cutting.
 The impurities in the air encourage oxidation of the
electrode and nozzle, and may make it difficult to strike
the pilot arc. If this occurs, use fine sandpaper to clean
the end of the electrode and the interior of the nozzle.
 Make sure that the new electrode and nozzle to be
mounted are thoroughly clean and degreased.
 Always use original spare parts to avoid damaging
the torch.
4.1. PASSWORD
To activate the password function: when
display upon start-up, immediately press the knob S1, and
select the icon by turning the knob.
The user is prompted to log in when the system is next
started up. Turn knob S1 to enter the correct password and
then press knob S1 to confirm it. If the code is incorrect, the
power source locks and
12
appears on the
appears on the display. To re-