Telwin PLASMA 30, Instruction Manual

permitted limits. 

frequency and voltage 

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.

moving forward, arc tilting 

- An excessive distance torch-piece or the absence of 

material (end cut) causes the immediate interruption of 

7. AIR PRESSURE FAULT  (YELLOW SIGNAL LED AND 

the arc.

RED SIGNAL LED - GENERAL ALARM“ON”

- Interruption of arc (cutting or pilot) is obtained by releasing 

    AT THE SAME TIME ) (Fig.C-7)

torch button.

- When lit it indicates that air pressure is not enough for 

- Piercing: If you have to make this operation or if  you have 

proper functioning.

to start from the center of the piece, ignite keeping the 

- During this phase, the functioning of the machine is 

torch tilted and bring it to an upright position with a smooth 

inhibited.

movement.

- Restoration is automatic (the led  turn off) after pressure 

- This procedure avoids that returns of arc or melted parts 

has lowered within required limits.

spoil the hole of the nozzle reducing its functionality.

8  TECHNICAL  DATA TABLE (Fig.I)
a  

Cutting circuit data 

Figure (F) the drawing shows the starting with 

-No-Load voltage  (U

0

).

tilted torch

-Cutting voltage and current (l

2 

/ U

2

) 

Piercing of parts with a thickness of 

25 % of max. usuable 

-Use intermittence ratio (X) 

foreseen, may be carried out directly.

b  

Mains  Data 

For peculiar uses (ex. cutting of pierced sheets or cutting 

-Phase number, 

with mechanized  torch ) contact our AFTER- SALE 

-Case protection degree

service and you will receive detailed instructions.

-Absorbed current (l

1 

)

-Delayed fuses to be used.

COMMONEST CUTTING FAULTS

During cutting operations performance faults may arise 

TORCH

which are not caused by plant malfunctioning but by other 

- The torch button is the only control device which can start 

operational faults such as:

and stop cutting operations.

a  

Insufficient penetration or excessive scoria settlement:

- When button is released the cycle is immediately and 

-too high cutting speed,

always stopped with the exception of cooling air (post-air).

-torch is too tilted,

- Accidental manoeuvres

: in order to start cycle button 

-piece is too thick,

must be pushed at least 500 ms.

-electrode and nozzle are worn out.

b

Interruption of cutting arc:

5. CUTTING OPERATIONS

-cutting speed too low.
-excessive distance between torch and piece,

PRELIMINARIES.

-electrode is worn out,

Check and follow instructions as foreseen in the 

- intervention of the protections

paragraphs 

1 SAFETY and  2 INSTALLATION of the 

C

Tilted cutting (not perpendicular)

present instruction manual.

-torch position not correct 

- Close (bring to position 

I

) automatic mains  switch and 

-asymmetric wear of nozzle hole and/or wrong 

general machine switch in sequence.

assemblage of torch parts.

- Choose, by turning the cutting current potentiometer, the 

d

Excessive wear of nozzle and electrode:

most suitable position to the work  to be performed.

-air pressure too low,

- Push and release torch button causing air outflow (

³

30s 

-contaminated air (humidity-oil),

post air).

 (Fig.C-8)

.

-nozzle holder  damaged,

- During this phase, set air pressure till gauge indicates 

-excessive pilot arc ignitions in the air.

value in “bar” requested according to the torch in use (see 
TECHNICAL DATA).

- Let air outflow terminate spontaneously to facilitate 

6. MAINTENANCE

removal of condense which settled on the torch.

WARNING !

NEVER ACCESS INSIDE THE MACHINE (PANEL 

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 VOLTAGE:

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 

Figure (E) the drawing shows torch position on part 

surfaces.

 (U )

1

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