Telwin PLASMA ARC 58/2 Manuel D'utilisation page 14

. Insulation class
. Type of cooling
. Case protection degree
- Energy data:
. Feeding voltage and frequency (U / Hz)
. Apparent current/power (l / S ) and relative power
factor (cosphi) according to available ranges.
. Delayed line fuses to be used.
TORCH
- The torch button is the only control part which can
start and stop cutting operations.
- When button is released the cycle is immediately and
always stopped with the exception of cooling air (post-
gas).
- Accidental manoeuvres: in order to start, cycle button
must be pushed at least 300 ms.
- Electric safety: functioning of button is inhibited if
insulating nozzle holder is NOT set on torch head, or if it
has been unproperly set.
5. CUTTING OPERATIONS
PRELIMINARIES.
- Verify and operate conditions described on
paragraph (1) SAFETY and (3) INSTALLA TION
contained in present instructions.
- Close (set to position I) in sequence the automatic line
switch and the general machine switch (PL 36/2) or the
voltage change-stop switch (PL 58/2).
- Choose, by working on range selector, the most
suitable position to the work that has to be performed.
- Push and release torch button (0,5 seconds) causing
air outflow (more or less 30 seconds-post gas).
- During this phase, set air pressure till gauge indicates
value in "bar" requested according to the torch in use
(see TECHNICAL DAT A).
- Let air outflow terminate spontaneously to facilitate
removal of condense which settled on the torch.
CUTTING
- Cutting mode:
. WITH CONTACT NOZZLE:
TORCH S30 with POWER SOURCE:
PL58/2 GAMMA 1.
PL 36/2 GAMMA 1 + GAMMA 2
. WITH DISTANCE NOZZLE:
TORCH S30 (SPACER INCLUDED)
with POWER SOURCE :
PL58/2 GAMMA 2
WARNING !
contact cutting performed when not necessary may
cause the torch nozzle to wear fast.
- Bring torch nozzle near the edge of the part (3 mm.)
push torch button; the pilot arc ignites. If distance is
right the pilot arc moves immediately to the part
generating the cutting arc.
- Draw torch above surface of the piece along the ideal
cutting line, moving smoothly forward.
Adjust cutting speed according to thickness and
selected range, verifying that the arc jutting out of
inferior surface has a 5-10 degree tilting to the opposite
side of direction.
Figure (H) the drawing shows torch position on
piece moving forward. Arc tilting
- Interruption of arc (cutting or pilot) is obtained by
releasing torch button.
- Piercing: If you have to make this operation or you have
to start from the center of the part, 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
1
1 1
parts spoil the hole of the nozzle reducing its
functionality.
Figure (I) the drawing shows the starting with
COMMONEST CUTTING FAULTS
During cutting operations performance faults may arise
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 piece,
- electrode is worn out,
- safety 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
R E M O V A L ) O R T O U C H T H E TO 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
MACHINE OR INSIDE THE TORCH MAY CAUSE
SEVERE ELECTRIC SHOCKS CAUSED BY DIRECT
CONTACT WITH LIVE PARTS :
TORCH
Figure (L) exploded view of torch S30
Periodically, according to its use or to cutting faults (see
Paragraph 5) verify wear status of 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
(distance and perpendicularity).
- Use spacer properly as shown.
Figure (M) 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 (N) electrode with crater
-14-
slanted torch
INSIDE THE