Elettro PLASMA 166 CHOPPER Manual De Instrucciones página 8

particular attention not to dent the power pin and not to
bend the adapter pins; a dented pin cannot be
disconnected, once fit, from the fixed fitting C (pict. 1);
a bent pin prevents the torch fitting Z from being
correctly mounted on the fixed fitting C (pict.1) and the
unit from working.
This machine is suitable for genuine ELETTRO CF
plasma torches type P70, P150, P150W only either
manual or automatic and we do not assume any
responsibility in case that a different kind of torch is
used.
N.B. Never lift the machine by the handle, but always
by the eyebolt.
3.2 SETTING AT WORK
Skilled personnel must install the unit. All fittings must
be in conformity with the existing rules and in full
compliance with safety regulations.
Connect the air feed to fitting on the air pressure reduction
unit T (pict. 2) making sure that pressure is 88PSI (6bar or
KPaX100) at least with a minimal capacity of 420 CFH
(200 litres/min). Should air feed come from a pressure
reducing unit of a compressor or of a centralised plant, the
reducing unit should be adjusted at the highest out put
pressure which should not exceed 120 PSI (8bar or KPa
x100). Should air feed come from a compressed air bottle,
this should be provided with a pressure regulator; never
connect compressed air bottles directly to the
reducing unit! Pressure may exceed the reducing unit
capacity and then explode!
Check that the mains power supply matches that indicated
on the technical date plate. Connect supply cable AD
(pict.2): the yellow-green wire of the cable must be
connected to an efficient earth plug of the system, the
remaining wires should be connected to the feed line by
means of a switch placed, if possible, close to the cutting
area so as to switch the unit off quickly if necessary.
The magnetothermic switch capacity or of fuses in series
with switch should be equal or above the current I
absorbed by the unit. Current I
reading the technical specifications on the unit i.e. feed
voltage U available. Any extensions should have
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adequate sections for current absorbed I
3.3 USE
Before using the equipment, read the standards CEI 26/9 -
CENELEC HD 407 and CEI 26.11 - CENELEC HD 433
carefully, and make sure all cable insulation is intact.
Turn on the machine using the knob A. This step will be
confirmed when the pilot lamp B lights.
If the torch P150W is connected, the LED P will flash for
15 seconds, during which time the machine will not work,
to ensure that coolant is circulating in the pipes.
Press the torch trigger very briefly to open the gas flow.
Make sure that, in these conditions, the pressure reading
on the pressure gauge G matches the values shown on the
control panel S; if not, adjust using the knob U of the
pressure regulator, then lock the knob by pressing it
downward.
Connect the grounding cable clamp to the workpiece,
making sure that the clamp and workpiece have a good
electrical contact, especially when using painted, oxidized,
or insulated metal.
Do not connect the clamp to the part of the material that
must be removed.
Use the knob F to select the cutting current based on the
thickness to be cut, following the guidelines below:
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absorbed is known by
1
.
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Aluminum:
Soft and stainless steel: up to 5 mm
The machine is equipped with constant cutting current
regulation, thus the user may seek out the correct value
based on the cutting conditions.
Current values higher than those indicated will not
jeopardize smooth operation of the machine or torch, and
at times may improve the cutting quality because they
reduce dross along the edges of the workpiece.
With cutting currents from 20 to 50A and a ø 1 or 1.1 mm
nozzle, you may rest the nozzle directly on the material to
be cut.
In other conditions, you must use a spacer to avoid placing
the nozzle in direct contact with the workpiece.
With a torch to be used in automatic mode, maintain a
distance of approximately 4/5 mm between the nozzle and
the workpiece.
Press the torch trigger to light the pilot arc.
If cutting does not begin after 2 seconds, the pilot arc will
go out; press the trigger again to re-light it.
Hold the torch upright while cutting.
Once cutting is complete and you have released the
trigger, air will continue to escape from the torch to cool it.
It is recommended not to shut the machine off until this
process is completed.
When cutting holes or beginning a cut in the center of the
workpiece, you must hold the torch at an angle and
straighten it slowly, so that molten metal is not sprayed
onto the nozzle (see pict.4). This should be carried out
when cutting holes in workpieces more than 3 mm thick.
When working in automatic mode (see pict. 5), keep the
nozzle 10-11 mm from the piece; if possible, move it to
approximately 4-5 mm after making the hole. Do not cut
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holes in pieces more than 10-12 mm thick. For greater
thicknesses, the material must be perforated before cut-
ting.
When making large, circular cuts, we recommend using
the special compass supplied upon request. It is important
to remember that you must follow the starting technique
described above when using the compass.
Do not keep the pilot arc lit in the air unnecessarily, to
avoid unnecessary consumption of the electrode, diffuser
and nozzle.
Shut off the machine when you have finished working.
3.4 GOUGING
This operation allows you to remove defective welds,
separate welded parts, prepare edges, etc.
To proceed, you must use the Ø 3 mm nozzle and the
relevant protection.
The current value to be used ranges from 70 to 110A,
based on the thickness and amount of material to be
removed.
It must be carried out by holding the torch at an angle (pict.
6), and moving towards the molten material so that the gas
escaping from the torch pushes it away.
The torch angle in relation to the workpiece depends on
the desired level of penetration. Since the molten dross
produced by this procedure tends to stick to the gas
nozzleholder and nozzle, clean them frequently to avoid
problems (dual arc) that can destroy the nozzle in the
space of a few seconds.
3÷4 mm 40÷50A
8÷10 mm 80÷90A
15÷18 mm 110÷120A
22÷25 mm 160A
40÷50A
up to 20 mm 80÷90A
up to 30 mm 110÷120A
up to 40 mm 160A