Telwin PLASMA 30 Manual página 12

permitted limits.
7. AIR PRESSURE FAULT (YELLOW SIGNAL LED AND
RED SIGNAL LED - GENERAL ALARM"ON"
AT THE SAME TIME ) (Fig.C-7)
- When lit it indicates that air pressure is not enough for
proper functioning.
- During this phase, the functioning of the machine is
inhibited.
- Restoration is automatic (the led turn off) after pressure
has lowered within required limits.
8 TECHNICAL DATA TABLE (Fig.I)
a Cutting circuit data
-No-Load voltage (U ).
0
-Cutting voltage and current (l
-Use intermittence ratio (X)
b Mains Data
-Phase number, frequency and voltage
-Case protection degree
-Absorbed current (l )
1
-Delayed fuses to be used.
TORCH
- The torch button is the only control device 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-air).
- Accidental manoeuvres: in order to start cycle button
must be pushed at least 500 ms.
5. CUTTING OPERATIONS
PRELIMINARIES.
Check and follow instructions as foreseen in the
paragraphs 1 SAFETY and 2 INSTALLATION of the
present instruction manual.
- Close (bring to position I) automatic mains switch and
general machine switch in sequence.
- Choose, by turning the cutting current potentiometer, the
most suitable position to the work to be performed.
- Push and release torch button causing air outflow ( 30s
post air). (Fig.C-8).
- During this phase, set air pressure till gauge indicates
value in "bar" requested according to the torch in use (see
TECHNICAL DATA).
- Let air outflow terminate spontaneously to facilitate
removal of condense which settled on the torch.
CUTTING
Cutting mode:
WITH THE TORCH it is necessary to work with the
NOZZLE IN CONTACT
WARNING!
-Making an unprepared contact cut will cause rapid wear of
the torch nozzle. Bring the torch nozzle near the edge of the
workpiece (= 3 mm.), press the torch button; after approx.
0.5 seconds (pre-air) the pilot arc is struck (max duration 2
seconds). If the distance is correct, the pilot arc immediately
transfers to the workpiece causing the cutting arc to be
struck.
Move the torch on the surface of the workpiece making
steady progress along the ideal cutting line. Adjust the
cutting speed according to the thickness and the selected
current, and check that the arc coming out of the lower
surface of the workpiece has an inclination of 5-10° to the
vertical in the opposite direction to the cutting direction.
Figure (E) the drawing shows torch position on part
All manuals and user guides at all-guides.com
/ U )
2 2
(U )
1
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
service and you will receive detailed instructions.
COMMONEST CUTTING FAUL TS
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
-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 damaged,
-excessive pilot arc ignitions in the air.
6. MAINTENANCE
WARNING !
NEVER ACCESS INSIDE THE MACHINE (P ANEL
REMOVAL) OR TOUCH THE TORCH (DISASSEMBLAGE)
WITHOUT HAVING 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 VOL TAGE:
TORCH
Periodically, according to its use or to cutting faults (see
Paragraph 5) verify wear of the par ts connected to plasma
arc:
1. 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).
2. NOZZLE.
Check wear of plasma arc hole and of inner and outer
surfaces.
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torch ) contact our AFTER- SALE