gala gar GAR CUT 550 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.
3.6 INTERNAL PROTECTION ELEMENTS
The Plasma GAR CUT 550 cutting equipment have the following internal protection elements:
- FUSE PROTECTION:
They have two protection fuses, F1: 0.5A/250V and F2 1A/250V.
F2: Protects the control circuit from overloads. If this has "blown" the ON/OFF light L1 will be off and the fan
will not turn.
F1: Protects the high frequency generator circuit from overloads.
- 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 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 internal 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 4.5 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.
GAR CUT (V. PROFESSIONAL). Instructions Manual.
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 lower than 40 sec.
Do not prolong the action of the pilot arc for
more than three seconds.
When using nozzle and long electrodes, for
security reasons, shield cup Ref. 51957/G
should be incorporated. 51965/G.
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