Telwin SUPERIOR PLASMA 160 Manual Del Usuario página 9

aluminium, iron and steel materials.
- Press the air button (Fig. C-3) to start the air flow.
- During this phase, adjust the air pressure until the pressure value
required for the type of torch being used is visible on the display
(TAB. 2).
- Adjust the knob: pull upwards to release it and then turn it
to adjust the pressure to the value indicated in the TORCH
TECHNICAL DATA.
- Read the required value on the pressure gauge and then press the
knob to lock the setting.
- Allow the air flow to end spontaneously to make it easier to remove
any condensate accumulated in the torch.
Cutting procedure (Fig. L).
- Approach the torch nozzle to the edge of the piece (about 2 mm),
and press the torch button; the pilot arc is triggered after about 1
second.
- If the distance is suitable, the pilot arc is immediately transferred to
the piece giving rise to the cutting arc.
- Move the torch on the surface of the piece along the ideal cutting
line at a regular pace.
- Adjust the cutting rate according to the thickness and selected
current, checking that the arc exiting the lower surface of the piece
is inclined by 5-10 degrees in relation to the vertical line, in the
opposite direction to the operating direction.
Grid cutting procedure (where applicable)
This function can be useful when cutting perforated or grid metal
sheets:
- Use the "select mode" button (Fig. C-2) to select the grid cutting
mode. On completing the cutting cycle, keeping the torch button
pressed, the pilot arc will restart automatically. Only use this
function when required to avoid unnecessary use of the electrode
and nozzle.
Perforation (Fig. M)
To perform this operation or start cutting from the piece centre, start
with the torch inclined at an angle and move it progressively to a
vertical position.
- This procedure prevents the arc or smelted particles returns
from ruining the nozzle hole which will rapidly compromise its
performance.
- Perforation of pieces with a thickness of up to 25% of the maximum
foreseen for the range of use can be performed directly.
7. MAINTENANCE
ATTENTION! BEFORE CARRYING OUT MAINTENANCE
WORK, MAKE SURE THAT THE PLASMA CUTTING SYSTEM
IS SWITCHED OFF AND DISCONNECTED FROM THE POWER
SUPPLY.
ROUTINE MAINTENANCE
ROUTINE MAINTENANCE WORK CAN BE PERFORMED BY THE
OPERATOR.
TORCH (Fig. N)
Check the wear level of the torch parts used by the plasma arc
regularly, depending on the level of use or if any cutting defects arise.
1- Spacer.
Replace if deformed or covered in slag to an extent that makes
it impossible for the torch to maintain a correct position (distance
and perpendicularity).
2- Nozzle holder.
Unscrew it from the torch head by hand. Clean thoroughly or
replace it if damaged (burns, deformation or cracks). Check the
condition of the upper metal section (torch safety actuator).
3- Nozzle / Hood.
Check the wear level of the plasma arc flow hole and the internal
and external surfaces. Replace the nozzle if the hole has widened
compared to the original diameter or is deformed. If the surfaces
are particularly oxidised, clean them using fine grain sanding
paper.
4 - Air distributor ring.
Check there are no burns or cracks and that the airflow holes are
not blocked. Replace immediately if damaged.
5 - Electrode.
Replace the electrode when the depth of the crater that forms on
the emission surface reaches about 1.5 mm (Fig. O).
6 - Air distributor pipe.
Check there are no burns or cracks and that the airflow holes are
not blocked. Replace immediately if damaged.
7 - Torch body, handgrip and cable.
Normally these components do not require any particular
maintenance except periodic inspection and thorough cleaning
without using solvents of any nature. If the insulation is damaged
showing cracks or burns or the electric conductors are loose, the
torch can no longer be used due to lack of conformity with the
required safety conditions.
In this case, repairs (extraordinary maintenance) can not be
performed on-site, as they must be performed by an authorised
service centre capable of conducting the special tests after the
repair.
To maintain the torch in good working condition, some fundamental
precautions must be taken:
- do not bring the torch or cable in contact with hot or scorching
parts.
- do not apply excessive strain on the cable.
- do not lay the cable on sharp corners, points or abrasive
surfaces.
- wind the cable into regular coils if it is longer than required.
- do not allow any vehicle to drive over the cable and do not tread
on it.
Attention.
- Before performing any work on the torch, allow it to cool down for
at least the "post-air" time.
- Except in particular cases, it is recommended to replace the
electrode and nozzle concurrently.
- Follow the torch components assembly order (reverse order
compared to the disassembly procedure).
- Make sure that the distributor ring is mounted in the right direction.
- Replace the nozzle holder screwing it on by hand applying light
pressure.
- Never replace the nozzle holder without having mounted the
electrode, the distributor ring and the nozzle.
- Avoid leaving the pilot arc on when not in use so as to prevent wear
and tear of the electrode, the diffuser and the nozzle.
- Do not use excessive force when tightening the electrode as this
can damage the torch.
- Timely and correct wear controls on the torch consumable parts
are vital for the safety and operational functions of the cutting
system.
- If the insulation is damaged showing cracks or burns or the electric
conductors are loose, the torch can no longer be used due to lack
of conformity with the required safety conditions. In this case,
repairs (extraordinary maintenance) can not be performed on-
site, as they must be performed by an authorised service centre
capable of conducting the special tests after the repair.
Compressed air filter (Fig. H)
- The filter has an automatic condensate exhaust that is activated
every time it is disconnected from the compressed air supply.
- Inspect the filter regularly; if there is any water in the glass, try
bleeding it manually pushing the exhaust fitting upwards.
- If the filter cartridge is particularly dirty, it must be replaced to avoid
excessive load losses.
EXTRAORDINARY MAINTENANCE
EXTRAORDINARY MAINTENANCE MUST ONLY BE CARRIED
OUT BY TECHNICIANS WHO ARE EXPERT OR QUALIFIED IN
THE ELECTRIC-MECHANICAL FIELD, AND IN FULL RESPECT
OF THE IEC/EN 60974-4 TECHNICAL DIRECTIVE
WARNING! BEFORE REMOVING THE MACHINE
PANELS AND WORKING INSIDE IT MAKE SURE THAT IT HAS
BEEN SWITCHED OFF AND DISCONNECTED FROM THE MAIN
POWER SUPPLY.
If checks are carried out inside the machine while it is live, this
may cause serious electric shock due to direct contact with live
parts.
- Inspect the inside of the machine regularly, with a frequency
depending on the amount of use and dust in the environment,
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