Generator Control Electronics - CPI Indico 100 Series Service And Installation Manual

CPI Canada Inc
7.1.4

Generator Control Electronics

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The generator control electronics includes the microprocessor and control circuits that are essential to
ensure the precise control of the power supply that is needed for state-of-the-art X-ray generators.
Input and output (I/O) and auxiliary power circuits are also provided, to interface to the control console
and to peripheral equipment in the X-ray system.
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The generator's executable code is stored in EPROM's in the console and generator CPU boards.
Communication between the two CPU boards is provided through a serial link.
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The room interface board provides the terminal blocks, I/O and power circuits for interfacing the
generator to the peripheral x-ray room equipment. This board also provides the connection to the
generator safety interlock circuits. The output power and the I/O signal conditions can be programmed
on this board through a number of relays and jumper terminals.
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The generator CPU board processes the feedback signals, and provides digital to analog and analog
to digital conversion for the control signals. It provides reference voltages to and from the high voltage
power supply and also contains up to four serial communications channels (one channel is dedicated to
the console and can be configured as an RS232 or RS422 port, the second port is an RS232 port for the
remote fluoro control, and the last two are optional RS232 ports for other use) and two timers. The
programmable generator parameters are also stored on this board in battery backed-up RAM.
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The generator interface board interconnects most of the internal generator boards (AEC, CPU, rotor
supply and room interface). Using opto-isolators this board isolates the I/O signals from the peripheral
X-ray room equipment (connected to the room interface board), from the microprocessor and control
circuits. This board also contains the power and interface circuits to the operator console. The
generator interface board also provides the interconnection for other generator options, such as digital
imaging and automatic exposure control.
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The optional automatic exposure control (AEC) board has up to four channels for connecting to four
different image receptors with AEC capabilities. The board detects a voltage that corresponds to the
quantity of radiation received by the image receptor during an exposure. When the threshold level for
the desired exposure technique is received, the AEC board generates an exposure stop signal that
immediately terminates the exposure.
Indico 100 Series Service Manual Ch # 740895-06 Rev. A
7
Theory of Operation
Page 7-5