3. Power Supply____________
A. General (Ref. Fig. 002) The ADIRU is normally supplied with 115VAC, 400 Hz power for the ADR and IR functions. However its AOA resolver converter module is supplied with 26VAC, 400 Hz. The 28VDC back-up generation is provided by batteries and is automatically used when the main power exceeds its normal limits. At the beginning of each power cycle, the ADIRU switches from the main to the back-up power to test the electrical generation. The table below gives the power consumption of each unit of the ADIRS:
------------------------------------------------------------------| EQUIPMENT | 28VDC | 115VAC | 26VAC | | |-------------------|-------------------| | | | Typical | Maximum | Typical | Maximum | | ------------------------------------------------------------------| ADIRU | 57 W | 71 W | 61 VA | 76 VA | 1 VA | |----------------|---------|---------|---------|---------|-------| | AOA Sensor | | | 250 VA | 320 VA |3.5 VA | |----------------|---------|---------|---------|---------|-------| | PITOT Probe | | | 281 VA | 360 VA | | |----------------|---------|---------|---------|---------|-------| | TAT Sensor | | | 200 VA | 350 VA | | |----------------|---------|---------|---------|---------|-------| | STATIC Probe | | 2X75 W | | | | |----------------|---------|---------|---------|---------|-------| | PHC | | 14 W | | | | ------------------------------------------------------------------
(1) ADIRU power consumption includes the supply of three ADMs. With ON BAT annunciator, add 0.6 W. With IR FAULT annunciator at I = 250 mA, add 1.3 W. Other annunciators are open/ground discretes and so they are energized by a power which is different from the ADIRU power. When the ADIRU is in the OFF mode, all the circuitry in the ADIRU is de-energized except for any logic associated with the power off function. Power consumption does not exceed 3.0 W on 115VAC and 0.3 W on 28VDC. Each ADIRU supplies the power for the ADM of its side (CAPT, F/O, STBY). The ADIRU also supplies the CDU with a 28VDC signal. The consumption of the CDU is 4.1 W (typical) and 19.1 W (maximum with additional
11.2 W for the first 2 minutes of turn-on at -15. for LCD heaters).
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-11-00Page 5 1 1 Config-1 May 01/05 1 1 1CES 1
ADIRS - Power Supply Distribution
Figure 002
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-11-00Page 6 1 1 Config-1 May 01/05 1 1 1CES 1 B. ADIRS Power Supply Distribution in Normal Configuration
(1) Captain side The ADIRU 1 is supplied with 115VAC by the 115VAC SHED ESS BUS 801XP-A. The back-up 28VDC is provided by the 28VDC HOT BUS 701PP. The resolvers of the AOA sensor 1 and the AOA resolver converter module of the ADIRU 1 are supplied with 26VAC by the 26VAC ESS BUS 431XP-A. The sensors and probes (static, TAT, pitot, AOA) are supplied for heating through the Probe Heat Computer 1:
-
the heating element of the AOA sensor 1 receives 115VAC from the 115VAC SHED ESS BUS 801XP
-
the heating element of the TAT sensor 1 receives 115VAC from the 115VAC BUS 1 101XP-A
-
the heating element of the L and R static probes 1 receives 28VDC from the 28VDC BUS 1 101PP
-
the heating element of the pitot probe 1 receives 115VAC from the
115VAC ESS BUS 401XP.
(Ref. Fig. 003)
NOTE : the ADIRS/PHC Interface figure is a principle diagram and does
____ not show the interface between the PHC and the sensors. (Ref. 30-31-00 for more details on probe ice protection).
(2)
First Officer side The ADIRU 2 is supplied with 115VAC by the 115VAC BUS 2 204XP-C. The back-up 28VDC is provided by the 28VDC HOT BUS 702PP. The resolvers of the AOA sensor 2 and the AOA resolver converter module of the ADIRU 2 are supplied with 26VAC by the 26VAC BUS 2 231XP-A. The sensors and probes are supplied for heating through the PHC 2:
-
the heating element of the AOA sensor 2 receives 115VAC from the 115VAC BUS 2 202XP-B
-
the heating element of the TAT sensor 2 receives 115VAC from the 115VAC BUS 2 202XP-C
-
the heating element of the L and R static probes 2 receives 28VDC from the 28VDC BUS 2 206PP
-
the heating element of the pitot probe 2 receives 115VAC from the 115VAC BUS 2 202XP-B.
(3)
Standby side The ADIRU 3 is supplied with 115VAC by the 115VAC BUS 1 101XP-C. The back-up 28VDC is provided by the 28VDC HOT BUS 701PP. The resolvers of the AOA sensor 3 and the AOA resolver converter module of the ADIRU 3 are supplied with 26VAC by the 26VAC BUS 1 131XP-A. The sensors and probes are supplied for heating through the PHC 3:
-the heating element of the AOA sensor 3 receives 115VAC from the 115VAC BUS 1 103XP
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-11-00Page 7 1 1 Config-1 May 01/05 1 1 1CES 1
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