Aspen Avionics EFD1000 E5 - 8.2.5.9 PN-101 Heading and Course Datum Output; 8.2.5.10 Heading Valid Output

EFD1000 E5 Dual Electronic Flight Instrument (EFI) Install Manual
DOCUMENT # 900-00041-001 PAGE 92-226 REVISION D
© Copyright 2019 Aspen Avionics Inc.
CRS
ACU P3-3
167mVdc per
degree up to
90⁰, or
15Vdc.
15Vdc
Reference
voltage may
be any
positive DC
or AC
reference
voltage
Assuming a reference voltage of +15Vdc, the
gradient is 167mVdc per degree up to 90⁰, or
+15Vdc. From 91⁰ to 180⁰ the output diminishes
by 167mVdc per degree, reaching 0Vdc at 180⁰.
For negative angles (CRS pointer left of the lubber
line) the gradient is -167mVdc per degree up to
-90⁰. From -90⁰ to -179⁰ the output diminishes by
167mVdc per degree reaching 0Vdc at 180⁰.
1
Datum outputs are in reference to ACU P3-11, ACU reference ground.
2
Reference voltage typically comes from autopilot computer.
Table 8-6: NSD360A Emulation Specifications
8.2.5.9 PN-101 Heading and Course Datum Output
Emulated PN-101 outputs to drive the heading and course datum inputs of an autopilot.
PN-101 EMULATION
ACU HSI TYPE = 3
1
DATUM
SCALING
2
REFERENCE
VOLTAGE
ACU P3-21
DESCRIPTION
(with ACU DATUM = NORMAL)
HDG
ACU P3-22
The gradient is
scaled to
11.8Vac
maximum at
90⁰ when using
a 26Vac
reference. It is
linear between
0⁰ and 90⁰.
26Vac
Reference
voltage may
be any AC
reference
voltage
Assuming a reference voltage of 26Vac, the
gradient is 131mVac per degree up to 90⁰, or
11.8Vac. From 91⁰ to 180⁰ the output
diminishes by 131mVac per degree, reaching
0Vac at 180⁰. For negative angles (HDG Bug left
of the lubber line) the gradient is out of phase
with the reference and is 131mVac per degree
up to -90⁰. From -90⁰ to -179⁰ the output
diminishes by 131mVac per degree reaching
0Vdc at 180⁰.
CRS
ACU P3-3
The gradient is
scaled to
11.8Vac
maximum at
90⁰ when using
a 26Vac
reference. It is
linear between
0⁰ and 90⁰.
26Vac
Reference
voltage may
be any AC
reference
voltage
Assuming a reference voltage of 26Vac, the
gradient is 131mVac per degree up to 90⁰, or
11.8Vac. From 91⁰ to 180⁰ the output
diminishes by 131mVac per degree, reaching
0Vac at 180⁰. For negative angles (HDG Bug left
of the lubber line) the gradient is out of phase
with the reference and is 131mVac per degree
up to -90⁰. From -90⁰ to -179⁰ the output
diminishes by 131mVac per degree reaching
0Vdc at 180⁰.
1
Datum outputs are in reference to ACU P3-11, ACU reference ground.
2
Reference voltage typically comes from autopilot computer or aircraft inverter.
Table 8-7: PN101 Emulation Specifications
8.2.5.10 Heading Valid Output
Active low discrete output indicating the EFD directional gyro is valid.
Valid: ............................ Sinks to ground
Invalid: .......................... Open
Load Current: ................ 100ma maximum