Maintenance - Cebora POWER PLASMA 2025/M Betriebsanleitung

cutting current return wire, and connected to the work-
piece 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 M to adjust the cutting
current from 5 to 20 A based on the work at hand.
Make sure that the earth clamp and the workpiece are in
good electrical contact, especially with painted or oxidi-
zed metal or with insulated coating; connect the clamp as
close as possible to the cutting area.
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.
Begin cutting.
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 best not to turn the machine off until this cool-
down period is complete.
• Should you need to make holes or begin cutting from
the center 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 fig.
2). This must be done when
making holes in pieces
more than 2 mm thick.
• Should you need to cut
several layers of metal, as
are normally used in auto
body work, adjust the cut-
ting current to the minimum
values (5÷10 A).
Turn the machine off when
the task is completed.
3.1 REPLACING CONSU-
MER PARTS
Always shut off the machi-
ne before replacing consu-
mer parts.
• The electrode must be
replaced when it has a crater
in the center approximately
1 mm deep.
• The gas nozzle must be
replaced when the hole is no
longer smooth and the cut-
ting capacity is diminished.
• The diffuser must be repla-
ced when some areas are
blackened. The electrode
must be unscrewed
screwed onto the torch body
by means of the specific
wrench. The diffuser, the elec-
trode and the nozzle must be
fitted in the order indicated in
figure 3.
fig. 2
U
T
or
V
W
fig. 3
• The nozzle holder must be replaced when the insulating
part is deteriorated
Make sure the diffuser U, the electrode T and the nozzle
V are correctly fitted and that the nozzle holder W is
screwed on tight.
If any of these parts are missing, this will interfere
with smooth operation of the machine and, especial-
ly, jeopardize operator safety
4 CUTTING ERRORS
4.1 INSUFFICIENT PENETRATION
This error may be caused by the following:
• high speed. Always make sure that the arc fully pene-
trates the workpiece and is never held at a forward angle
of more than 10 -15°. This will avoid incorrect consump-
tion of the nozzle and burns to the nozzle holder.
• Excessively thick workpiece (see cutting 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.
4.2 THE CUTTING ARC GOES OFF
This error may be caused by:
• worn nozzle, electrode or swirl ring.
• air pressure too high.
• supply voltage too low.
4.3 SHORTER LIFE OF CONSUMER PARTS
This error may be caused by:
• oil or dirt in the arc intake,
• unnecessarily long pilot arc,
• low arc pressure.
5 HELPFUL HINTS
• If the system air contains considerable amounts of moi-
sture and oil, it is best to use a drying filter to avoid
excessive oxidation and wear on consumer parts, dama-
ge to the torch and a reduction in the speed and quality
of the cutting.
• 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.

6 MAINTENANCE

Any maintenance operation must be carried out by qua-
lified personnel in compliance with standard CEI 26-29
(IEC 60974-4).
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