Telwin Infinity Plasma 40 Manuel D'instructions page 13

moving forward, arc tilting
- An excessive distance torch-piece or the absence of
material (end cut) causes the immediate interruption
of the arc.
- Interruption of arc (cutting or pilot) is obtained by
releasing torch button.
- Piercing: If you have to make this operation or if you
have to start from the center of the piece, ignite
keeping the torch tilted and bring it to an upright
position with a smooth movement.
This procedure avoids that returns of arc or melted
parts spoil the hole of the nozzle reducing its
functionality.
Figure (F) the drawing shows the starting with tilted
torch
- Piercing of parts with a thickness of 25 % of max.
usuable foreseen, may be carried out directly.
- For peculiar uses (ex. cutting of pierced sheets or
cutting with mechanized torch ) contact our AFTER-
SALE service and you will receive detailed
instructions.
COMMONEST CUTTING FAULTS
During cutting operations performance faults may arise
which are not caused by plant malfunctioning but by
other operational faults such as:
a Insufficient penetration or excessive scoria
settlement:
- too high cutting speed,
- torch is too tilted,
- piece is too thick,
- electrode and nozzle are worn out.
b Interruption of cutting arc:
- cutting speed too low.
- excessive distance between torch and piece,
- electrode is worn out,
- intervention of the protections
c Tilted cutting (not perpendicular)
- torch position not correct -
nozzle hole and/or wrong assemblage of torch parts.
d Excessive wear of nozzle and electrode:
- air pressure too low,
- contaminated air (humidity-oil),
- nozzle holder damaged,
- excessive pilot arc ignitions in the air.
6. MAINTENANCE
WARNING !
NEVER ACCESS INSIDE THE MACHINE (PANEL
R E M O V A L ) O R T O U C H T H E T O R C H
( D I S A S S E M B L A G E ) W I T H O U T H A V I N G
DISCONNECTED POWER PLUG. ANY INSPECTION
PERFORMED UNDER VOLTAGE INSIDE THE
MACHINE OR INSIDE THE TORCH MAY CAUSE
SEVERE ELECTRIC SHOCKS CAUSED BY DIRECT
CONTACT WITH PARTS UNDER VOLTAGE:
TORCH
Periodically, according to its use or to cutting faults (see
Paragraph 5) verify wear of the parts connected to
plasma arc:
1-SPACER.
- Replace if distorted or coated by scoria so as to make
it impossible to keep the torch in the proper position
asymmetric wear of
(distance and perpendicularity).
- Use spacer properly as shown.
Figure (G) drawing showing proper use of spacer
2- NOZZLE HOLDER.
Unscrew manually from head of the torch. Clean
throughly and replace if damaged (burns, distortions or
cracks). Verify integrity of superior metal sector
(actuator torch safety).
3-NOZZLE.
Check wear of plasma arc hole and of inner and outer
surfaces.
If the hole is widened compared to its original width or if
it is damaged, replace nozzle. If surfaces are
particularly oxidated clean them with extra fine
abrasive paper.
4- AIR DISTRIBUTION RING.
Verify there are no burns or cracks or that airflow holes
are not obstructed. If damaged, replace immediately.
5- ELECTRODE
Replace electrode when crater settling on emitting
surface is about 2 mm.
Figure (H) drawing shows electrode with crater
Figure (I) drawing shows exploded view of torch
WARNING !
- Before making any operation to the torch let it cool at
least all along the"postgas" period.
- Except for particular cases it is advisable to replace
electrode and nozzle AT THE SAME TIME.
- Respect assembly order of torch parts (reserved
compared to disassemblage).
- Be careful that distributing is assembled properly.
- Reassemble nozzle holder screwing tightly and
manually.
- Never assemble nozzle holder without having
assembled electrode distributing ring and nozzle
beforehand. Timely and appropriate control
procedures on torch parts are essential for safety and
functionality of the cutting system.
- TORCH BODY, HANDLE AND CABLE.
These parts usually need no particular maintenance
with the exception of a periodic inspection and an
accurate cleaning to be made WITHOUT THE USE
OF SOLVENTS.
In case of damages to the insulation such as breaks,
cracks and burns or even a loosening of electric
conductors, the torch CANNOT BE USED FURTHER
SINCE SAFETY CONDITIONS HAVE NOT BEEN
RESPECTED.
IN THIS CASE, REPAIRING (EXTRAORDINARY
MAINTENANCE) CANNOT BE MADE ON SITE BUT
NEEDS TO BE DELEGATED TO AN AUTHORIZED
SERVICE CENTER TO MAKE SPECIAL TEST
T R I A L S A F T E R R E P A I R I N G H A S B E E N
EXECUTED.
In order to keep the torch and cable efficient it is
necessary to follow these precautions:
- DO NOT touch torch and cable with warm or hot parts.
- DO NOT strain the cable.
- DO NOT move the cable on sharp edges or abrasive
surfaces.
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