A320飞机维护手册 AMM 指示/记录系统 7(45)

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 -Maintenance and test controls accessible through the MCDUs
 -Circuit breakers: those connected to ESSENTIAL bus bars are located on the panel 49VU of the overhead panel, the others are located on the panel 120VU.
 3. Power Supply
____________ The 3 DMCs, and the 6 DUs are supplied with 115VAC/400 Hz single phase. The FCU and ECAM control panel are supplied with 28VDC. The table below gives the main electrical power sources for each component.
 NOTE : The DMCs and DUs are also supplied with 28VDC for switching purpose
____
 (mentioned in table 1-2)

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 EIS Block Diagram Figure 004
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 Component Location in the Cockpit
 Figure 005

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 Component Location in the Cockpit
 Figure 006

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 Avionics Compartment - EIS
 Figure 007

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 -------------------------------------------------------------------------------| AC BUS1 | AC BUS2 | AC ESS | DC BUS 1 | DC BUS 2 | DC ESS BUS | |----------|------------|-----------|------------|------------|---------------| | DMC3 | DMC2 | DMC1 | | | | | | | (DMC3) | | | | |----------|------------|-----------|------------|------------|---------------| | | PFD2 | PFD1 | | | | |----------|------------|-----------|------------|------------|---------------| | ND1 | ND2 | | | | | |----------|------------|-----------|------------|------------|---------------| | | Lower | Upper | | | | | | ECAM DU | ECAM DU | | | |
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 TABLE 1-2
 -------------------------------------------------------------------------------| AC BUS1 | AC BUS2 | AC ESS | DC BUS 1 | DC BUS 2 | DC ESS BUS | |----------|------------|-----------|------------|------------|---------------| | | | | | DMC2 | DMC1&3 | |----------|------------|-----------|------------|------------|---------------| | | | | | PFD2 | PFD1 | |----------|------------|-----------|------------|------------|---------------| | | | | ND1 | ND2 | | |----------|------------|-----------|------------|------------|---------------| | | | | | Lower | Upper | | | | | | ECAM DU | ECAM DU |
 (Ref. Fig. 008)
 In emergency configuration, the static inverter then the AC and DC power
 supplies are restored for some components, by means of the hydraulically
 driven emergency generator. The hydraulic power source is the Ram Air
 Turbine (RAT).
 As far as the EIS components are concerned, power supply is given to:
 -DMC1 (or DMC3 if selected by CAPTAIN)
 -PFD1
 -Upper ECAM DU
 NOTE : If cooling air is lost, the grey background areas disappear from the
____ PFDs and the WX image from the NDs. If the DU internal temperature exceeds a given threshold, the DU is automatically cut off. This applies to any DU, EFIS or ECAM.
 4. Component Description-System Description
________________________________________
 A. Component Description
 (1) Display Units (DU) (Ref. Fig. 009) All 6 DUs include a CRT which is a high resolution Full Color Display (FCD) of the shadow-mask type. Their size is 7.25" x 7.25". They are fully interchangeable. They present information in normal configuration. For that reason, the DUs can be called by the name of the display that they normally present: PFD1(2), ND1(2), engine/warning display (or upper ECAM display), system display (or lower ECAM display).
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 Main Electrical Power Supply of EIS Components
 Figure 008

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1

 Display Unit - Typical Image
 Figure 009

 1EFF : 106-149, 303-399, 1 31-60-00Page 17 1 1 Config-3 Aug 01/05 1 1 1CES 1 The DUs receive digital signals from DMCs, under a very high speed serial form, through Dedicated Serial Data Link (DSDL) busses. These digital signals represent instructions which activate the graphic generator. This permits to have the proper drawings, symbols, indications, messages drawn on the DUs according to all the DMC input signals. The graphic generator is part of the symbol generator, which is included in the DU. In turn the DUs send back to their driving DMC some feedback signals which give the DU operational and functional status plus acknowledgment of data received from DMC. The DUs also receive other specific signals from the DMCs for the weather radar. This concerns only the two NDs (and the two PFDs which can also present an ND image after a PFD-ND transfer). At last, light sensors are installed on the face of each DU in order to provide automatic adjustment of the display brightness with changing light conditions. This automatic brightness adjustment is combined with the manual brightness control, with priority to the manual control.
　
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