Cutting Errors; Insuficient Penetration; The Cutting Arc Goes Off; Shorter Life Of Consumer Parts - Snap-On PLASMA 20i Manual De Instrucciones

must be fitted in the order indicated in figure 3.
• The nozzle holder must be replaced when the insulating
part is deteriorated
Make sure the swirl ring U, the electrode T and the
nozzle V are correctly fitted and that the nozzle hold-
er W is screwed on tight.
If any of these parts are missing, this will interfere
with smooth operation of the machine and, especial-
ly, jeopardize operator safety.

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 (see cutting charts).
• 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 SHORTER LIFE OF CONSUMER PARTS

This error may be caused by:
• oil or dirt in the arc intake,
• unnecessarily long pilot arc,
• low arc pressure.
THIS PART IS INTENDED SOLELY FOR QUALIFIED PERSONNEL.
CETTE PARTIE EST DESTINEE EXCLUSIVEMENT AU PERSONNEL QUALIFIE.
ESTA PARTE ESTÁ DESTINADA EXCLUSIVAMENTE PARA EL PERSONAL CALIFICADO.
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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.
• 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

Any maintenance operation must be carried out by
qualified personnel according to all applicable codes
and safety pratices.

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 the power voltage at the ends of the con-
densers is close to 0 V.
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 com-
pressed air.
6.2 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. In particular make sure
the cover of the power circuit dissipators (31) is fitted.
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 pre-
vent 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.