Torch Maintenance; Maintenance And Control - Elettro plasma 75 Instruction Manual

paper.
• Make sure that new electrode and nozzle to fit are clean and
degreased.
• To avoid damage of torch always use original spares.

3.6 TORCH MAINTENANCE

Always disconnect the unit before any repair of torch.
1) Replace wear parts (pict. 11) The parts subject to wear are
electrode A, diffuser B and nozzle C. Either part may be only
replaced after loosening nozzle holder D. Electrode A should
be replaced when a 1/16" (1,5 mm) deep crater is created in
the middle (see picture 12).
ATTENTION Do not
unscrewing the electrode, but gradually force so as to have
the thread unlocked. Lubricate the thread of the new
electrode with silicone lubricant (on supply with the unit).
This new electrode is required to be screwed in its housing
and locked without tightening.
Nozzle C should be replaced when its central hole is damaged
or enlarged with respect to the new part (see picture 13). Use
of worn electrode quickly wears out the nozzle. Excessive use
of electrode causes overheating and reduces the life of diffuser
B. Make sure that after replacing it, nozzle D is tight enough.
ATTENTION!! Nozzle holder D should be only screwed on
head when electrode A diffuser B and nozzle C are
assembled.
2) Replace torch body E (see pict. 11). Remove the screw V.
Withdraw handle F from body E by swaying it and making sure
that button wires are not torn when separating both parts.
Withdraw the G and H safety contacts wires. Withdraw the
contact L. Unscrew fitting I after cutting the insulating hose K.
Assemble the new body of torch making all above operations
inversely. Fitting I is insulated by shrink hose K stuck to the
fitting when heated by a small source (ex. a lighter). Before
8
make sudden stresses
CUTTING VELOCITY DIAGRAM
replacing handle make sure that cables are far away from each
other and that fittings are tightly secured.
3) Substitution of adapter (W) (see pict. 11). Remove ring nut
Z and cut the clamps locking cable R. Loosen screw Y and
extract cover X. Extract the control cable pins N and O and the
red cable pins for pilot arc P. Cut the insulating sheath K2 and
loosen the adapter body U from connector Q. 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 U on connector Q. Pins N and O of the
control cable should be connected to contacts (1) and 9 of
adapter body U. Pins P of the red cable for pilot arc should be
connected to contacts 5 and 6 of adapter body U. Sheath K2
when
acts as insulating material and adheres to connector Q after
warming it up.
4) Replacement of cable R (see pict. 11). To replace cable
follow instructions as per pos.2 and 3 and connect S.
N.B.: Fitting S should be properly insulated.
5) Replacement of handle with button.
To replace handle with button it is required to follow instructions
as per pos.2.

3.7 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 water
discharge, working 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.