Operation
• A temperature sensor is located on the VCPU board site U29.
• A/D Power Supply Fault - This fault means the power source to the A/D
converter has failed and thus the A/D converter results are unreliable. If
the RF tracking signal is an analog input then immediate attention should
be given to correct this failure. If the RF tracking signal is supplied over
the serial port then this alarm should not affect the operation of the ACU.
• ±12 Volt Source Faults - This fault means the +12 (or -12) volt power
source has fallen below 10.95 volts. The ACU power supply sources this
voltage which feeds the resolver reference oscillator circuits, the keypad
speaker, and the display controller card. This fault is a latching fault that
causes the system to return to the standby mode.
• +24 Volt Source Fault - This fault means the +24 volt power source has
fallen below 22.24 Volts. The ACU power supply sources this voltage
which feeds the optical encoder (optional feedback device) and the 7200
ACU cooling fans.
• Low Battery Warning - The warning means the battery voltage has fallen
below 2.7 Volts. Replace the battery soon or the parameters and the real
time clock may be erased when the ACU is powered down.
• RTC Power Source Fault - The fault means the charge pump which supplies
+3.3V to the real time clock circuit has fallen below 2.97 Volts. The
failure will cause the ACU clock to stop counting.
5.8.5.1.7 ACE DUART Diagnostics
This display shows the number of serial port interrupts processed and number of
characters processed by the receive queue handler. Pressing [ENTER] resets the
counters.
• Receive queue characters - Total number of characters processed by the
receive queue handler.
• Summed DUART interrupts - All DUART interrupts share a common
interrupt handler. This is the number of times this interrupt handler has
been called.
• Receive queue interrupts - Number of interrupts per serial port. Port 0 is
the display. Total may differ from "Summed DUART interrupts" if port
does not have receive queue attached to it.
5-40
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