Maintenance - Elettro CF Plasma 484 Instructions Manual

1.5 ASSEMBLY AND ARRANGEMENT
Unpack the unit and assemble the handle with the supplied
spanner. Place the unit in a properly ventilated and, if
possible, non dusty room, making sure that the air inlet and
outlet from cooling slots are not obstructed.
This machine is suitable for ELETTRO CF manual torch
type P 25 and we do not assume any responsibility in
case that a different kind of torch is used.
1.6 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 power cord G: 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
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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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1.6.1 Motor-driven generators
They must have an electronic regulator of the tension, a
power equal to or greater than 2,5 kVA and must not
deliver a voltage greater than 260V.
2 USE
Switch the unit on by turning switch H (pict.1); this is shown
by LED A (pict.1) which is on. By pressing for a second the
torch button, the compressed air flow is opened.
Connect work clamp to the piece to be cut.
N.B. Cut quality is greatly improved if the nozzle is kept
in contact with the workpiece.
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 and keep pressed the torch trigger to strike the pilot
arc. If cutting does not begin within 3 seconds, the pilot arc
goes out and, to re-strike it again, you have to press the
trigger again and repeat the starting sequence.
Hold the torch upright while cutting.
When you have finished cutting and released the trigger,
air will continue to leave the torch for approximately 30
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. 3).
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.
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.
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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
incorrect consumption of the nozzle and burns to the
nozzle holder.
Excessively thick workpiece (see cutting speed
charts).
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,
supply voltage too low.
eff.
3.3 TILTED CUTTING
When cutting appears tilted (see picture 4), switch the unit
off, loosen nozzle holder and turn nozzle by a quarter turn,
then lock and try again. Repeat this operation until cutting
is straight (see picture 5).
4 HELPFUL HINTS
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.

5 MAINTENANCE

Always cut off the power supply to the machine before any
operation, which must always be carried out by qualified
personnel.
5.1 GENERATOR MAINTENANCE
In the case of maintenance inside the machine, make sure
that the switch H is in position "OFF" and that the power
cord is disconnected from the mains.
Also make sure that there is no voltage at the ends of the
IGBT group capacitors.
It is also necessary to periodically clean the interior of the
machine from
compressed air.
5.2 TORCH MAINTENANCE (See pict. 8)
Replacement of consumable parts
The parts subject to wear are electrode 17, diffuser 18 and
nozzle 19. All parts may be only replaced after loosening
nozzle holder 20. Electrode 17 should be replaced when a
1/16" (1,5 mm) deep crater is created in the middle (see
picture 6). Nozzle 19 should be replaced when its central
hole is damaged or enlarged in comparison with the new
part (see picture 7).
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the accumulated metal dust, using