R.V.R. Elettronica PJ5KPS, User'S & Technical Manual

Page: 58 / 168

PJ5KPS
52 / 80 User & Technical Manual Rev. 1.5 - 08/02/06
7.6 Combiner and divider
7.6.1 Control Unit
The RF combiner section too is equipped with it own microprocessor control unit.
This is very important for the functionning of the whole transmitter because it checks
the foldback line of the several RF modules. The value of the output power is managed
directly by this micro controller. In case of fault of this control unit or if a problem
arises in the communication bus, the transmitter will continue working at the same
power level set in the field "nominal power" of the control unit.
To this unit is assigned the task to limitate and stabilize the output power. When one
of the parameters reaches its safety limit for the right functionning of the machine, the
power level decreases progressively. The feedback is completely of analogic type,
made through a voltage present on the control bus. The voltage is between the
maximum of 3.9 V (this indicates that the transmitter is supplying the maximum power)
and 0 V (minimum power).
This section also controls the maximum permitted power level of the exciters, with a
programmed alarm of “Fault” type. If this level is exceeded the transmitter turns itself
OFF and the AC supply of the exciters is cut until the operator pushes the Alarms
Reset button.