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Fitting is insulated by shrink hose stuck to the fitting
when heated by a small source (ex. a lighter).
Before replacing handle make sure that cables are far
away from each other and that fittings are tightly
secured.
3) Substitution of adapter 12 (see picture 11).
Remove the ring nut and cut the clamps locking cable
10. Loosen screw and extract cover. Extract the control
cable pins i and a and the red cable pins for pilot arc e
and f. Cut the insulating sheath and loosen the adapter
body 12 from connector 11. Fit the new adapter body
carrying out all previous operations in reverse order.
Use sealing adhesive for threads in order to lock the
adapter body thread 12 on connector 11. Pins i and a
of the control cable should be connected to contacts i
and a of adapter body 12. Pins e and f of the red cable
for pilot arc should be connected to contacts e and f of
adapter body 12. Sheath acts as insulating material
and adheres to connector 11 after warming it up.
4) Replacement of cable 10 (see picture 11).
To replace the cable, follow instructions as per pos.2
and 3 and connect.
N.B.: Fitting should be properly insulated.
5) Replacement of handle with button.
To replace handle with button it is required to follow
instructions as for pos.2.
3.8 Maintenance and control
It is recommended to keep nozzle free from slag. Avoid
using sharpened bodies thus avoiding damaging the
nozzle hole. Even if the unit is provided with an
automatic
device
for
whenever air feed is closed, it is recommended to
check from time to time that no water remains in trap I
of reducer. It is required to clean from time to time the
unit inside and make it free from metal dust by means
of compressed air. Operations to be carried out inside
the unit must be effected after disconnecting feed
cable.
4 UTILISATION WITH TORCH P50
(on demand, only for art. 496.)
The machine is suitable to operate also with the P50
torch with the adapter (on demand). When you mount
this torch the machine is automatically arranged with a
cutting current of 50A max and with an adjustment
possibility which starts from 20A.
You will be able to cut, in contact with the piece, both
using our standard nozzle and electrode and our longer
nozzle and electrode.
Please note: It may be happen that when you use
the torch P50 the block device for exhausted
electrode could not operate.
5 GUIDE TO POSSIBLE FAILURES
Failures that could occur during machine operation are
listed below, this list being by no means exhaustive.
Repair, if any, should only be carried out by qualified
personnel.
12
water
discharge,
working
Fuses protect primary and secondary windings of the
service transformer. In case of failure, first action to be
taken will be checking if any fuse is burnt.
1) Starting:
A) If turning the switch A on (picture 1), the net pilot
lamp lightens but the machine does not start and
nothing happens when the torch push-button is
pressed, verify:
the efficiency of the service transformer and the
−
continuity of the electric circuits.
the efficiency of control circuits.
−
the presence of all the three phases in the machine's
−
plug.
that the flange 1 (picture 3) is correctly assembled.
−
B) If turning the switch A (picture 1) on the net pilot
lamp lightens, the machine does not start but air flows
out of the torch when the push-button is pressed,
ensure:
−
that plant pressure is sufficient. The lamp signalling
insufficient pressure may be faulty.
that the microswitch of the air pressure switch (only
−
for art. 496), or the rectifier, or the power unit, or control
circuit are efficient.
that spare parts: electrode (2, pict. 11), diffuser (3,
−
pict. 11), nozzle (4, pict. 11), nozzle holder (5, pict. 11)
are correctly assembled.
2) Pilot arc:
The duration of the pilot arc in air is approx. 2/3 sec.,
even holding the torch push-button.
Air keeps flowing out as long as the push-button is held
and until approx. 1 minute after releasing it.
C) If the machine is functioning and pressing the push-
button no air flows out of the torch, verify:
that nozzle holder 5 (picture 11) is appropriately
−
fastened and fitted with electrode, diffuser and nozzle.
that thermostat is not temporarily off due to
−
transformer overload or discontinued (pilot lamp C,
picture 1). The lamp that
intervention could be out of order.
that push-button, safety contacts, and control cables
−
on the torch are not discontinued.
that solenoid valve is efficient and that feeding is
−
correct; if not, replace control circuit, after checking the
continuity of the electrical connections.
D) If the machine is working and pressing the push-
button, the air flows out of the torch but the arc is not
activated, ensure:
that the torch has not short-circuited.
−
−
that pilot arc contactor is efficient .
that the contactor is feeded; if not, replace the control
−
circuit, after checking the electrical circuit.
that complete power unit - only for art. 496 - is
−
efficient.
that the high-tension circuit is efficient.
−
that impedance - only for art. 496 - has not short-
−
circuited. If pressing the torch push-button the high-
tension circuit generates sparkles on the platinum
points but the pilot arc is not activated, impedance
must be replaced.
3) Cutting
indicates
thermostat
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