Cebora POWER PLASMA 3100 Service Manual page 5

CEBORA S.p.A.
The HF board (22) also acts as an input and output interface for the torch; the board contains
the torch start button circuit and the power anchors for the earth terminals, electrode and nozzle
of the torch.
The HF board (22) also includes the circuit for switching from pilot arc to transfer arc. It is
made up of a REED sensor which, when it detects the passage of current on the earth conductor,
interrupts the pilot arc current at the torch nozzle and sends the corresponding signal to the
microprocessor, which in turn switches the level of current from pilot arc to transfer arc, thus to
the set cutting current.
The HF board (22) also contains the drive circuit for the plasma gas solenoid valve (20),
which is controlled both with pilot arc and transfer arc.
On the rear panel is mounted the pressure regulator (7) completed with filter, pressure gauge
and pneumatic fitting to connect the plasma gas.
The signals processed by the electronic boards and present at their connectors are listed in the
table in chapter five of this manual.
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31/05/02