Helpful Hints; Generator Maintenance - Elettro PLASMA 77 HF Manuel D'instructions

 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
diagrams, pict. 4)
 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
• 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 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
compressed air.
5.1.1 Troubleshooting
The LED B lights when the following conditions occur:
LED B
Steadily lit
Steadily lit
Steadily lit
Steadily lit
Steadily lit
Steadily lit
Flashing lit
5.2 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
9
accumulated metal
CONDITION SOLUTION
Upon equipment
Wait 5 sec
start-up
Button pressed
Release the
during equipment
button
start-up
Incorrect IGBT Contact technical
drive voltage service
Reed contact
closed during Contact technical
equipment start- service
up
Supply voltage Check the supply
too low voltage
Check the power
supply line. Note:
in some
situations a
missing phase
Phase missing in does not cause
the power supply the LED B to
line light, therefore
you should
always check the
power supply line
in the case of
malfunction.
Short-circuit
between Replace the
electrode and electrode and
nozzle during gas nozzle, and
equipment start- diffuser if
up or during necessary
cutting
dust, using