Generator Maintenance - Elettro CF Plasma Cutter 56 Manuel D'instructions

................ Suitable for use in high-risk environments.
NOTES: The machine has also been designed for use in
environments with a pollution rating of 3. (See IEC 664).
1.5. START-UP
The machine must be installed by qualified personnel. All
connections must be made in compliance with current
safety standards and full observance of safety regulations
(see CEI 26-23 - IEC TS 62081).
Connect the power cord I (pict. 1): the yellow-green cable
wire must be connected to an efficient grounding socket on
the system. The remaining wires must be connected to the
power supply line by means of a switch placed as close as
possible to the cutting area, to allow it to be shut off quickly
in case of emergency.
The capacity of the cut-out switch or fuses installed in
series with the switch must be equal to the current I
absorbed by the machine.
The absorbed current I eff. may be determined by reading
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the technical specifications shown on the machine under
the available supply voltage U
Any extension cords must be sized appropriately for the
absorbed current I max.
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1.5.1 Motor-driven generators
They must have an electronic regulator of the tension, a
power equal to or greater than 7,5 kVA and must not
deliver a voltage greater than 440V.
2. USE (see pict. 1)
Turn the machine on using the switch H. The warning lamp
A will light to indicate that the machine is on.
Connect the grounding clamp to the workpiece.
The cutting circuit must not be deliberately placed in direct
or indirect contact with the protective wire except in the
workpiece.
If the workpiece is deliberately grounded using the
protective conductor, the connection must be as direct as
possible and use a wire of at least the same size as the
cutting current return wire, and connected to the workpiece
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 F to select the cutting current.
Use a nozzle of diameter 0,95.
Make sure that the grounding clamp and workpiece have a
good electrical contact, especially with painted, oxidized or
insulated sheet metal.
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.
Hold the torch upright while cutting.
When you have finished cutting and released the trigger,
air will continue to leave the torch for approximately 100
seconds to allow the torch to cool down.
It is advisable not to turn the machine off until this
cool-down period is complete.
Should you need to make holes or begin cutting from the
centre 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 pict. 2).
This must be done when making holes in pieces more than
3 mm thick.
For thicknesses greater than 10 mm, the material must be
perforated before cutting.
When making circular cuts, we recommend using the
special compass available upon request. It is important to
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.
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remember that use of the compass may make it necessary
to use the starting technique described above (see pict. 2).
Do not keep the pilot arc lit in the air when not needed, to
avoid unnecessary consumption of the electrode, swirl ring
or nozzle.
Turn the machine off when the task is completed.
3. CUTTING ERRORS
3.1. INSUFFICIENT PENETRATION
This error may be caused by the following:

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.

Grounding clamp not in good electrical contact with
eff.
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

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 H (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
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