USSI Microlok II Functional description
UM-6800A Rev1.3 July 2005 Page 9 of 27
• Responding to CPU board front panel switch inputs and operating the
associated displays
• Interacting with a laptop PC during system diagnostic operations,
application logic programming, and executive software upgrading
4.1.5. POWER SUPPLY BOARD
The Power supply board will have double width housed in the card file and it
operates in the range of 9.5V to 16.5V DC producing 5V at 3amps and +12V
at 1amp that are needed for the operation of the card file circuitry. The power
supply will have a start–up voltage requirement of 11.5V DC. This prevents
the unit from attempting a recovery when battery voltage is low. The power
supply board performs the following functions:
• Converts the external supply voltage (9.8V to 16.2V DC) to regulated +12V
and +5 for outputs to the system card file internal circuits
• Supplies energy to the VCOR relay coil under the control of the CPU board
The power supply board serves a vital role in the fail-safe design of the
Microlok II system. The regulated +12V and +5V power is distributed to all
system card file boards through the card file back plane bus.
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