Cebora PLASMA PROF 123 ACC Manual De Instrucciones página 13

For currents higher than 45A a spring spacer or a 2-end
spacer must be used to avoid to put into direct contact
the nozzle or the nozzle protection with the workpiece
to be cut.
With the welding torch in automatic mode, keep a dis-
tance of approximately 4mm between the nozzle pro-
tection and the workpiece, as indicated in the cutting
tables..
Press the torch trigger to start the pilot arc.
If the cutting operation is not started, the pilot arc goes
out after 2 seconds; to restart it press the torch trigger
again. Keep the welding torch in a vertical position while
working.
When the cutting is fi nished and the torch trigger is re-
leased air continues leaking from the welding torch to
assure the torch cooling.
It is recommended not to turn the equipment off before
this operation is over.
When using the welding torch in manual mode and when
holes are to be cut or cutting must be started from the
workpiece center the welding torch must be placed in a
slanted position and then slowly straightened up to pre-
vent melted metal from being sprayed onto the nozzle
protection (see fi g.4). This operation must be carried out
when holes thicker than 3mm are to be cut.
When using the welding torch in automatic mode (see
fi g. 5) follow strictly the instructions contained in the cut-
ting tables as for sagging, working height and maximum
cutting thicknesses, which must comply with the current.
Fig.4
When circular cuts are to be made we recommend to use
the caliper supplied on demand. Do not forget that when
using the caliper it may be necessary to follow the above
mentioned starting method.
To avoid excessive wearing of the electrode, swirl ring
and nozzle the pilot arc should not be kept on in the air if
not necessary.
Once the operation is completed, turn the machine
off.
4.2 GRID CUTTING (SELF-RESTART OPERATING
MODE)
Use this function to cut drilled plates or grids.
When cutting is completed, keep the knob pressed and
the pilot arc will restart automatically. Use this function
only if required, to avoid excessive wearing of the
electrode and the nozzle.
Fig.5
4.3 GOUGING ("GOUGE" OPERATING MODE). only
for CP161 torches.
Fig. 6
This operation makes it possible to remove defective
welds, to separate welded pieces, to prepare edges, etc.
For this operation use a 3 mm ø nozzle.
The value of the current to be used varies from 60 to 120A
depending on the thickness and quantity of material to
be removed. With the welding torch in slanted position
(fi g.6) proceed towards the melted metal so that the gas
coming out of the welding torch keeps it away. The weld-
ing torch slanted position versus the workpiece depends
on the penetration you want to obtain. As melted dross
tends to stick to the nozzle holder and nozzle protection
during this procedure, it is recommended to frequently
clean them so as to avoid problems (double arc) which
may destroy the nozzle in few seconds. Given the strong
(infrared and ultraviolet) radiation emission during this
operation, it is recommended that the operator and peo-
ple nearby wear an adequate protection.
Once the operation is completed, turn the machine off.
5. REPLACING THE CONSUMABLES
IMPORTANT: Switch the power source off before re-
placing any consumables.
Making reference to Fig. 7 and Fig 8, parts subject to
wear are electrode A, swirl ring B, nozzle C and nozzle
protection E (only for torch CP161). These should be re-
placed after unscrewing the nozzle holder D.
Electrode A must be replaced when it shows an approx
1.2 mm deep crater at the center.
CAUTION: do not use sudden force to unscrew the elec-
trode; work gradually to release the thread. The new
electrode must be screwed into the seat and fastened in
place without tightening fully.
The nozzle C must be replaced when the central hole
is damaged or wider than that of a new part. Delays in
replacing the electrode or nozzle will cause the parts to
overheat, and jeopardize the life-span of the swirl ring B.
Make sure that the gas nozzle holder D is fi rmly tightened
after replacement.
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