Elettro PLASMA 77 HF Manuel D'instructions page 8

on the distance between the contact tip
and the workpiece.
If this distance increases, the cutting
voltage also increases and the duty cycle
X% may decrease.
U Rated supply voltage for 208/220/230V -
1
400/440V with automatic voltage change.
3~ 50/60Hz 50- or 60-Hz three-phase power supply.
I Max Max.
1
corresponding current I
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 digit means that
this equipment
outdoors in the rain.
Suitable
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.
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 (0.8 Mpa).
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: 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
absorbed 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
Make sure the trigger has not been pressed.
Turn the machine on using the switch O. The warning
lamp A will light to indicate that the machine is on.
Press the torch trigger briefly to open the flow of
compressed air. Under this condition set the pressure
shown by the pressure gauge M, at 4,7 bar (0.47 MPa) for
Item 493 and 5 bar (0,5 MPa) for Item 497 by means of the
reducer knob K, and 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
absorbed current at
and voltage U
2
is suitable for
for use in high-risk
.
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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
the
clamp or a second grounding clamp placed in the
2
immediate vicinity. Every precaution must be taken to avoid
stray currents.
Use the knob G to select the cutting current.
Use nozzle ø 1 up to 45 A and 1,2 from 45 to 70A.
With nozzle ø1 a contact cutting can be made; the
recommended voltage should not be exceeded to avoid
damaging the nozzle port because this would produce a
very poor quality cut.
use
With nozzle ø 1,2 and 45 to 70 A currents use the two
faces spacer.
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 2 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.
During automatic operation (see pict. 3), hold the nozzle
6/7 mm away from the workpiece. After the hole has been
made, move it to a distance of approximately 3/4 mm.
For thicknesses greater than 6/8 mm, the material must be
perforated before cutting.
When making circular cuts, we recommend using the
special compass available upon request. It is important to
eff.
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remember that use of the compass may make it necessary
to use the starting technique described above (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.
To cut perforated or grid metal, activate the
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:
8
function