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Page Title:
Discrete Outputs from CAU to Avionics |
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|  MIL-N-81604C(AS)
Appendix I
Para 30.5.9.1
(cont)
restoration of the fault indicator circuits to
their normal fault seeking condition. The CAU
line receiver shall be a Type 3 circuit.
Clutched Heading Discrete - This discrete from
e.
*
the AFCS shall go to a 28 volts d-c to engage
the clutch to allow the rotor of `the heading
*
error CX to follow the true heading servo.
*
`When the discrete is at O volts d-c, the clutch
shall be de-energized and the CX shall supply
*
(Refer to 30.5.7.2h).
electrical zero.
30.5.9.2 Discrete Outputs from CAU to Avionics - The output
impedance to ground of these Type 3 discrete outputs from the
CAU to avionics shall be approximately 100 ohms if CAU power
is off.
ANCU No-Go - This discrete output from the CAU
a.
to the SCRAM shall be provided to indicate that
the ANCU malfunction flag has been set. When
the flag is in a set (no-go) state, a high shall
be supplied. When the flag is in a reset state,
a low shall be supplied. The CAU line driver
shall be a Type 3 circuit.
CIU No-Go - This discrete output from the CAU
b.
to the SCRAM shall be provided to indicate that
the CIU malfunction flag has been set. When the
*
flag is in a set (no-go) state, a high shall be
supplied. When the flag is in a reset state,
a low shall be supplied. The CAU line driver
shall be a Type 3 circuit.
IMU No-Go - This discrete output from the CAU
c.
to the SCRAM shall be provided to indicate that
the IMU malfunction flag has been set. When
*
the flag is in a reset (go) state, an open
relay contact shall be supplied. When the flag
*
is in a set (no-go) state, a ground shall be
supplied. The relay contacts shall have a
*
28-volt d-c, 0.5-ampere capacity. The common
contact shall be connected to ground.
PSU No-Go - This discrete output from the CAU
d.
to the SCRAM shall be provided to indicate that
the PSU malfunction flag has been set. When the
flag is in a reset (go) state, an open relay
contact shall be supplied. When the flag is in
177
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