gala gar GAR CUT 1050 Manual Técnico De Instrucciones página 17

3.5 RECOMMENDATIONS RESPECT TO CUTTING CYCLE.
The correct settings of the times indicated are
essential for the equipment to work perfectly.
Air must exist before the arc is ignited, as if
this does not exist, the torch head would be
seriously deteriorated due to the formation of
the electric arc inside. The time that elapses
between the appearance of air and the
ignition of the arc is what we have called
preflow. We suggest the routine of slightly
pressing the pushbutton in order to get the air
to come out without producing ignition. After
checking the existence of air we can now
ignite the arc by pressing the pushbutton
continuously.
The post-flow time is also very important with
respect to the working life of the cutting torch.
This time delimits the degree of cooling of the
torch after having carried out a cutting
process. We do not recommend reducing the
value of this time unless work is only being
carried out in the minimum cutting position
where 40 sec. postflow can be used.
The pilot arc time adjustment can be
modified by prolonging it. Too long a pilot
arc time is not suitable as the life of the
consumable elements decreases. However
this time can be adapted to your needs.
3.6 INTERNAL PROTECTION ELEMENTS
The GAR CUT (V. Industrial) Plasma cutting
equipment have the following internal protection
elements:
- FUSE PROTECTION:
They have two protection fuses, F1: 2A/250V
and F2 0.5A/250V.
F1: Protects the control circuit from overloads.
F2: Protects the high frequency generator circuit
from overloads.
- GENERAL SAFETY PROTECTION:
It forces the use of a tool to connect and
disconnect the plasma torch (safety cap).
GAR CUT (V. INDUSTRIAL). Instructions Manual.
- PROTECTION AGAINST OVERHEATING IN THE
TRANSFORMER (L2).
As soon as the transformer reaches a high
temperature, a protection mechanism is activated
which prevents the cutting operation from being
continued. This is indicated by means of the amber
light L2 situated on the front of the machine which
will stay on when the torch pushbutton is pressed,
as there is no cutting cycle.
- PROTECTION AGAINST ABSENCE OF PRESSURE
IN PNEUMATIC CIRCUIT.
It is important for the air flow in the torch outlet
to correspond to that given in table nº 2, in order
to prevent deterioration caused by overheating of
the torch. The machine has a pressurestat which
prevents the cutting operation if the intake pressure
is above a limit value. This is indicated by a red
pilot light L2 which will stay on if the pressure is
not correct. The pressurestat is on the inside of the
equipment next to the regulating filter. This
pressurestat has an adjustment screw which
enables the value of the minimum pressure to be
established (around 4.6 bar).
- PROTECTION AGAINST DIRECT CONTACTS IN
THE PISTOL BODY.
In order to prevent dangerous voltages when
carrying out work on the torch body (replacement
of consumable components, for example), the
torch has a safety system (activated by the nozzle-
holder) which cancels the action of the pushbutton.
However it must be borne in mind that the body of
the torch must always be handled with the
MACHINE DISCONNECTED.
- PROTECTION AGAINST CUTTING WITHOUT
THE EXISTENCE OF ELECTRICAL EARTH.
In order to prevent cutting without the existence
of an electrical earth (cutting with the pilot arc) the
equipment has a cutting current detection system
which times the pilot arc.
WARNING !
IF THE SAFETY CAP OF THE TORCH HAS
NOT BEEN INSERTED, THE MACHINE WILL
NOT BE OPERATIVE.
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