Generator Maintenance; Helpful Hints - Cebora 359 Manual De Instrucciones

(fig.4) 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.
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.
• 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 met-
al 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 SLANTED CUT
If the cut appears slanted, turn the machine off and re-
place the nozzle.
When the cutting current is above 45 A, prevent the nozz
le from coming into electrical contact with the workpiece
(even through scraps of molten metal), this condition
causes rapid and at times instantaneous destruction of
the nozzle hole, leading to poor quality cutting.
4.4 EXCESSIVE WEAR ON CONSUMablee PARTS
This problem may be caused by:
a) air pressure too low compared to the recommended
level.
b) excessive burns on the end of the nozzle holder.

5 HELPFUL HINTS

• If the system air contains considerable amounts of
moisture and oil, it is best to use a drying filter to avoid
excessive oxidation and wear on consumer parts, dam-
age to the torch and a reduction in the speed and quality
of the cutting.
• 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.
6 MAINTENANCE
Always cut off the power supply to the machine be-
fore any operation, which must always be carried out
by qualified personnel.

6.1 GENERATOR MAINTENANCE

In the case of maintenance inside the machine, make sure
that the switch C is in position "O" 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.
Even though the machine is equipped with an automatic
condensation drainage device that is tripped each time
the air supply is closed, it is good practice to periodically
make sure that there is no condensation accumulated in
the water trap I (fig.1). It is also necessary to periodically
clean the interior of the machine from the accumulated
metal dust, using compressed air.
6.1.1 Troubleshooting.
The LED S lights when the following conditions occur:
LEDS CONDITION
Steadily Upon equipment
lit start-up
Steadily Button pressed during
lit equipment start-up
Steadily Missing safety
lit protection R
Steadily Incorrect IGBT drive
lit voltage
Steadily Reed contact closed
lit during equipment
start-up
Steadily Supply voltage too
lit low
Steadily Phase missing in the
lit power supply line
Flashing Short-circuit between
lit electrode and nozzle
during equipment
start-up or during
cutting
SOLUTION
Wait 5 sec
Release the button
Mount the protection
Contact technical
service
Contact technical
service
Check the supply
voltage
Check the power sup-
ply line. Note: in some
situations a missing
phase does not cause
the LED S to light,
therefore you should
always check the po-
wer supply line in the
case of malfunction
Replace the electrode
and gas nozzle, and
diffuser if necessary
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