Elettro 444 Betriebsanleitung Seite 8

If this distance increases, the cutting voltage
also increases and the duty cycle X% may
decrease.
U .................... Rated supply voltage.
1
3~ 50/60Hz .... 50- or 60-Hz three-phase power supply
I Max .............. Max. absorbed current at the corresponding
1
current I
2
I eff ............... This is the maximum value of the actual
1
current absorbed, considering the duty
cycle. This value usually corresponds to the
capacity of the fuse (delayed type) to be
used as a protection for the equipment.
IP23 ................ Protection rating for the housing. Grade 3 as
the second
equipment is suitable for use outdoors in
the rain.
................ Suitable for use in high-risk environments.
NOTES: The machine has also been designed for use in
environments with a pollution rating of 3. (See IEC 664).
1.5. START-UP
The machine must be installed by qualified personnel.
All connections must be made in compliance with current
safety standards and full observance of safety regulations
(see CEI 26-23 - IEC TS 62081).
Connect the air supply to the fitting L (pict. 1).
If the air supply comes from a pressure regulator of a
compressor or centralized system, the regulator must be set
to an output pressure of no more than 8 bar (116 PSI). If the
air supply comes from a compressed air cylinder, the
cylinder must be equipped with a pressure regulator.
Never connect a compressed air cylinder directly to the
regulator on the machine!
The pressure could exceed the capacity of the regulator,
which might explode!
Connect the power cord P (pict. 1): the yellow-green cable
wire must be connected to an efficient grounding socket on
the system. The remaining wires must be connected to the
power supply line by means of a switch placed as close as
possible to the cutting area, to allow it to be shut off quickly
in case of emergency.
The capacity of the cut-out switch or fuses installed in series
with the switch must be equal to the current I
by the machine.
The absorbed current I eff. may be determined by reading
1
the technical specifications shown on the machine under the
available supply voltage U
Any extension cords must be sized appropriately for the
absorbed current I max.
1
2. USE (see pict. 1)
Use the knob G to select the cutting current.
Fit the consumables with the code corresponding to the
chosen current to the torch.
Make sure the trigger has not been pressed.
Turn the machine on using the switch O. The warning LED
A will light to indicate that the machine is on.
Set the pressure shown by the pressure gauge M at 5 bar
(73 PSI) for items 444 and 445 and at 5.8 bar (84 PSI) for
items 446 and 447 by means of the reducer knob K, and
and voltage U .
2
digit means that
eff. absorbed
1
.
1
then lock the knob by pushing it down. Connect the
grounding clamp to the workpiece.
The cutting circuit must not be deliberately placed in direct
or indirect contact with the protective wire except in the
workpiece.
If the workpiece is deliberately grounded using the protective
conductor, the connection must be as direct as possible and
use a wire of at least the same size as the cutting current
return wire, and connected to the workpiece at the same
point as the return wire using the return wire clamp or a
second grounding clamp placed in the immediate vicinity.
Every precaution must be taken to avoid stray currents.
this
Make sure that the grounding clamp and workpiece have a
good electrical contact, especially with painted, oxidized or
insulated sheet metal.
Do not connect the grounding clamp to the part of the
material that is to be removed.
Press the torch trigger to strike the pilot arc.
If cutting does not begin within 3 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.
If you want to stop the flow of the air earlier, you have to
quickly press and release the torch trigger.
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.
For thicknesses greater than:
10 mm for item 444
14 mm for item 445
20 mm for item 446
25 mm for item 447
the material must be perforated before cutting.
When making circular cuts, we recommend using the special
compass available upon request. It is important to remember
that use of the compass may make it 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 task is completed.
SELF RESTART PILOT (NETS AND GRIDS CUTTING)
To cut perforated or grid metal, activate the special
function using the push-button F (LED E lit).
When you have finished cutting, holding this push-button
down will cause the pilot arc to restart automatically.
Use this function only if necessary to avoid unnecessary
wear on the electrode and nozzle.
3. CUTTING ERRORS
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 incorr ect
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