Precautions After Repairs; Generator Maintenance - Elettro PLASMA 50-25 Mode D'emploi

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
• air pressure too high
• supply voltage too low
3.3. SLANTED CUT
If the cut appears slanted, turn the machine off and replace
the nozzle.
When the cutting current is above 45 A, prevent the nozzle
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.
3.4. EXCESSIVE WEAR ON CONSUMABLE 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.
4. 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,
damage 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.
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 O (pict. 1) 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 N (pict.1).
It is also necessary to periodically clean the interior of the
machine from the accumulated metal
compressed air.
5.1.1 Troubleshooting
The LED B (pict. 1) lights when the following conditions
occur:
LED B
Steadily lit
Steadily lit
Steadily lit
5.2. TORCH MAINTENANCE (See pages 34,36,38,40)
Replacement of consumable parts
The parts subject to wear are electrode 23, diffuser 24 and
nozzle 25. All parts may be only replaced after loosening
nozzle holder 26. Electrode 23 should be replaced when a
1/16" (1,5 mm) deep crater is created in the middle. Nozzle
25 should be replaced when its central hole is damaged or
enlarged in comparison with the new part.
The use of a worn electrode quickly wears out the nozzle.
When the electrode is worn, the power cut of the machine
is reduced. A delayed replacement of electrode and nozzle
causes overheating of consumable parts and reduces the
life of diffuser 24. Make sure that after replacing it, nozzle
holder 26 is tight enough.
ATTENTION! Nozzle holder 26 should be screwed on
head only when electrode 23, diffuser 24 and nozzle 25
are assembled.

5.3. PRECAUTIONS AFTER REPAIRS

After making repairs, take care to organize the wiring so
that there is secure insulation between the primary and
secondary sides of the machine. Do not allow the wires to
come into contact with moving parts or those that heat up
during operation. Reassemble all clamps as they were on
the original machine, to prevent a connection from
occurring between the primary and secondary circuits
should a wire accidentally break or be disconnected.
Also mount the screws with geared washers as on the
original machine.
dust, using
11
CONDITION SOLUTION
Upon equipment start-
Wait 5 sec
up
Incorrect IGBT drive Contact technical
voltage service
Reed contact closed
Contact technical
during equipment
service
start-up