Elettro PLASMA 50-25 Mode D'emploi page 10

X .....................Duty cycle percentage.
The duty cycle expresses the percentage of
10 minutes during which the welding
machine may run at a certain current I
voltage U
I .....................Cutting current.
2
U ....................Secondary
2
welding current I
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.
1
3~ 50/60Hz .....50- or 60-Hz three-phase power supply
I Max ..............Max. absorbed
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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 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 (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 (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
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.
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2. USE (see pict. 1)
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.
Set the pressure shown by the pressure gauge M at 5 bar
(0,5 MPa) by means of the reducer knob K, and then lock
the knob by pushing it down. Connect the grounding clamp
to the workpiece.
without overheating.
2
conventional voltage
. This voltage depends
2
current at
and voltage U
2
.
1
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
and
2
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
with
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.
Use the knob G to select the cutting current.
Item 452: use a nozzle of diameter 0,95.
Item 454: use a nozzle of diameter 1,10.
Make sure that the grounding clamp and workpiece have a
good electrical contact, especially with painted, oxidized or
the
insulated sheet metal.
2
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, 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:
10 mm for art. 452
14 mm for art. 454
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.
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.
eff.
1
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 avoi d
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.
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