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|  MIL-N-81604C(AS)
Para . 3.4.4.5b(1)
.
(cont)
*
39 volts maximum and low voltages of 21 volts
*
minimum on the 28 volt d-c supplies, or a low
voltage of +16.5 volts minimum on the +32 volt
*
d-c supply shall initiate this discrete. Dur-
ing power turn-on, this discrete shall go low
*
within 5 milliseconds after the +28 volt d-c
*
supply exceeds 6 volts. It shall remain low
*
until the +28 volt d-c supply reaches 21 volts.
During normal turn-off, this discrete shall go
*
low no later than 2 milliseconds before the
+28 volt supply to the IMU drops below +24 volts
*
*
d-c.
This signal shall be used to initiate the ANCU
and IMU power sequence shutdown. The line
drivers in the PSU and the line receivers in
the ANCU and IMU shall be Type E circuits.
Flag Inhibit - This discrete shall go to the
(2)
true state (low) within one microsecond after
initiation.
The overvoltage and undervoltage
conditions stated in (1) above shall initiate
the signal. The signal shall also be initiated
within 5 msec after a primary power drop out.
The signal shall be used to inhibit the setting
of the malfunction flags in the IMU, ANCU, and
CAU whenever the PSU malfunctions or the PSU
is turned off. In addition, it shall notify
these units that aircraft primary power has
dropped out. During power turn-on this dis-
crete shall go low within 5 msec after the
+28 volts supply exceeds 6 volts d-c.
It shall *
*
stay low until the +28 volts supply reaches
*
+21 volts d-c. During normal turn-off this
discrete shall go low no later than 2 ,msec
before the +28 volts supply to the IMU drops below
+24 volts d-c. The line drivers in the PSU and
line receivers in the ANCU and IMU shall be
Type E circuits.
PSU No-Go - This discrete output from the PSU
(3)
shall go to the true (open) state to indicate
the PSU malfunction flag has been set to the
no-go state. This occurs whenever the PSU
*
79
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