Lincoln Electric OERLIKON CITOCUT 25i Bedienungsanleitung Seite 13

G. Fan: Provides machine cooling. It is switched ON
with the machine and continues to run till the
machine is turned OFF.
H. Power Switch: It turns ON / OFF the input power to
the machine.
I. Input cable: Connect it to the mains.
J. Air Inlet : If the "Ext Air" operating mode is selected,
connect here the hose carrying the air to the
machine.
A clean, dry air must be supplied to the machine. A
pressure setting above 7.5bar could damage the torch.
Failure to observe these precautions could result in
excessive operating temperatures or damage to the
torch.
Cutting Process
The air plasma cutting process uses air as primary
cutting gas and as torch cooling gas.
The air is provided by the built-in compressor with a
pressure of 3.5bar (approximate value).
The Citicut 25i can reach the best cutting performances
operates also with external air; in this case the air
pressure is limited by a pressure regulator [F], set at
factory at 5.0bar. In case to adjust the air pressure, put
the machine in Purge mode [A].
The pilot arc is struck as follow:

"In Compr" operating mode:
The torch button enables the built-in compressor
that provide the air flow to the torch. Releasing
the torch button the cutting process is stopped,
but the compressor continues to run for the post-
flow stage.

"Ext Air" operating mode:
energize an electrovalve (solenoid valve). This
valve lets the air flow during the cutting and the
post-flow stages.
The design concept at the basis of these power sources
is to have available a current which remains constant at
the set value, independently from the length of the
plasma arc.
English
WARNING
the torch button
When preparing to cut, make sure you have all materials
needed to complete the job and have taken all safety
precautions. Install the machine as instructed in this
manual and remember to attach the work clamp to the
work piece.

Turn ON the Power Switch [H] placed on the back of
the machine; the LED [B] on the front panel will turn
ON. The unit is now ready to operate.

Check that the primary air is available through the Air
Purge function [A].

Set the desired current value with the Output Current
[A] knob.
To start the cutting process just press the torch button,
making sure you are not aiming the torch air blow
towards people or foreign objects. During the cutting
process it is possible to hold the torch away from the
work piece for an extended period of time.
To piercing the work piece, lower the
torch onto the metal at a 30° angle
away from the operator.
blow the dross (melted metal) away
from the torch tip.
Slowly rotate the torch to the vertical
position as the arc becomes deeper.
Once the work piece is pierced
normal cutting can occur.
Keep moving while cutting
and cut at a steady speed so
that the arc leg is 10° to 20°
behind the travel direction.
Use a 5° to 15° leading angle
in the direction of the cut.
Once the cutting process is
terminated releasing off the
torch button will cause the
plasma arc to be turned off;
the air flow will continue for
approximately 20sec. (post-flow) to allow the cooling
down of the torch.
9
This will
English