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4-8
888-2463-001
3/6/08
WARNING: Disconnect primary power prior to servicing.
Diamond Series™
Section 4 Theory of Operation
4.4.3
Detectors
The PA Cabinet utilizes RF detector circuits to monitor power levels in various parts of
the cabinet. These circuits rectify an RF signal sample, turning it into a DC voltage. The
square of this voltage is proportional to the RF sample level. The detected DC voltage
is amplified in the detector and temperature stabilized. Switchable gain settings and a
pot adjustment on each circuit section allow the output voltage to be set for 4 VDC at
the maximum RF power that is expected on the RF sample line. This analog DC voltage
is monitored and processed by the Cabinet Controller.
4.4.4
Cabinet Controller
The Cabinet Controller is a microprocessor based board that communicates with the
Main Controller (in the Control Cabinet) and the Module Controllers through the serial
CAN bus. The function of the Cabinet Controller board is to provide a means of control
and protection of the PA Cabinet as well as interfacing to the Main Controller via the
CAN bus. Inputs come from the 16 module circulator reject power samples, Cabinet
ON/OFF commands, Power Supply voltages, cabinet interlock, air pressure and cabinet
output forward power/reflected power. Outputs are system ON/OFF and module
phasing voltage.
Each PA Cabinet is a stand-alone unit. The only external input it requires from the
Control cabinet is the interlock chain which is passive and does not require the Control
Cabinet to be powered to operate. ON and OFF operation can be done by push buttons
on the Cabinet Controller board.
The Cabinet Controller is microprocessor based with a discrete logic back-up identical
to the main controller/life support board in the Control Cabinet but on a smaller scale.
Thus, this board can operate with or without the microprocessor. It receives commands
both serially from the Main Controller and discrete parallel from the Life support board.
Either serial or parallel is sufficient to operate the PA Cabinet.
In addition to the global CAN communication bus there is a local RS-485 bus between
the PA Modules and the Cabinet Controller in each PA Cabinet. The GUI interfaces
with the Cabinet Controller via RS-232. A laptop could be used to interface directly to
the PA Cabinet in the event of a Main Controller or CAN bus failure. The laptop
interfaces through an RS-232 port on the Cabinet Controller to control and monitor, or
update software in that PA cabinet.
The Cabinet Controller is located in the top slot of the Power Amplifier Cabinet. The
molded cover swings up to allow access to the Cabinet Controller assembly. The
assembly can be pulled out and will swing down after the fasteners are loosened. This
will allow access to the top of the board.
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