Telwin SPL 60/3 Manual De Instrucciones página 21

which are not caused by plant malfunctioning but by other
operational aspects such as:
a Insufficient penetration or excessive scoria settlement:
- too high cutting speed,
- torch is too tilted,
- part is too thick,
- electrode and nozzle are worn out.
b Interruption of cutting arc:
- cutting speed too low.
- excessive distance between torch and part,
- electrode is worn out,
- security intervention.
c Inclined cutting (not perpendicular)
- unproper torch positioning,
- asymmetric wear of 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 is damaged,
- excess of pilot arc ignitions in the air.
6. MAINTENANCE
WARNING !
NEVER ACCESS CURRENT SOURCES (PANEL
REMOVAL) OR TOUCH THE TORCH (DISASSEMBLAGE)
WITHOUT HAVING DISCONNECTED POWER PLUG.
ANY INSPECTION PERFORMED UNDER TENSION
INSIDE THE MACHINE OR INSIDE THE TORCH MAY
CAUSE SEVERE ELECTRIC SHOCKS CAUSED BY
DIRECT CONTACT WITH PARTS UNDER TENSION:
TORCH
Periodically, according to its use or to cutting faults (see
Paragraph 5) verify part wear 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
(distance and perpendicularity).
- Use spacer properly as shown.
Figure (O) 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. On torch
HP 150, use suitable "extractor" for disassemblage.
5 ELECTRODE
Replace electrode when crater settling on emitting surface
is about 2 mm.
Figure (P) drawing shows electrode with crater
On torch HP 150 use wrench included for disassemblage;
pull smoothly without jerks.
On reassemblage use wrench moderately.
Figure (Q) drawing shows exploded view of
Figure (R) drawing shows exploded view of
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 DELEGA TED TO AN AUTHORIZED
SERVICE CENTER TO MAKE SPECIAL TEST TRIALS
AFTER REPAIRING HAS BEEN 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.
- Gather the cable in regular coils if it is too long.
- DO NOT step on the cable.
CURRENT SOURCE (MACHINE).
- Inspect the inside of the machine periodically according to
its use and to the place in which it is used. In case of dust
deposits, remove dust on transformer, rectifier,
inductances, and resistors through a flow of dry
compressed air (max.5 bars).
- At the same time verify that electric connections are tightly
shut and that insulated wires are not damaged.
- Do not point compressed air flow on electronic cards and
relevant connectors; use a soft brush to remove dust
deposited on these parts.
- Verify integrity and seal of pipelines and compressed air
connectors.
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torch HP 50
torch HP 150