Lincoln Electric INVERTEC PC208 Bedienungsanleitung Seite 10

H. Power Switch: It turns ON / OFF the input power to
the machine.
I. Input cable: Connect it to the mains.
J. Air Inlet (PC210 only): 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 PC210 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 5bar. In case to adjust the air pressure, put
the machine in Purge mode [A].
The pilot arc is struck as follow:
•
PC208:
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.
• PC210:
"In Compr" operating mode: same as PC208.
"Ext Air" operating mode: the torch button
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.
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.
WARNING
To piercing the work piece, lower the
torch onto the metal at a 30° angle
away from the operator. This will
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.
Maintenance
For any maintenance or repair operations it is
recommended to contact the nearest technical service
center or Lincoln Electric.
performed by unauthorized service centers or personnel
will null and void the manufacturers warranty.
The frequency of the maintenance operations may vary
in accordance with the working environment. Any
noticeable damage should be reported immediately.
•
Check cables and connections integrity. Replace, if
necessary.
•
Regularly clean the torch head, check its
consumables and if necessary replace them.
Refer to the torch instructions before changing or
servicing the torch.
•
Keep clean the machine. Use a soft dry cloth to
clean the enclosing case, especially the airflow inlet
/ outlet louvers.
•
Regularly clean the compressor air inlet filter.
Do not open this machine and do not introduce anything
into its openings. Power supply must be disconnected
from the machine before maintenance and service. After
each repair, perform proper tests to check safety
requirements.
A-4
WARNING
Maintenance or repairs
WARNING
WARNING