-
supply of part of the DC network (DC SVCE busses), without

 energization of the whole aircraft electrical network. The MAINT BUS switch located on the panel 2000VU controls the supply of the ground service network.
 4. Controls and Indications Related to Electrical Generation and Distribution
__________________________________________________________________________
 **ON A/C 001-049, 051-060, 101-102, 201-201,
 (Ref. Fig. 003)
 **ON A/C 061-099, 103-105, 151-158, 202-209,
 (Ref. Fig. 003A)

R **ON A/C 106-149, 159-199, 210-299, 301-399, 401-499,
 (Ref. Fig. 003B)

 **ON A/C ALL
 Controls and indications related to electrical generation and distribution are on:
 -
the ELEC control panels,

 -
the ECAM display units,

 -
the forward entryway circuit breaker panel (2000VU),

 -
the CFDS.

 A.
 MAINT BUS Switch

 **ON A/C 001-049, 051-060, 101-102, 201-201,
 (Ref. Fig. 003)

 **ON A/C 061-099, 103-105, 151-158, 202-209,
 (Ref. Fig. 003A)

R **ON A/C 106-149, 159-199, 210-299, 301-399, 401-499,
 (Ref. Fig. 003B)
 **ON A/C ALL
 This switch is located on the panel 2000VU. It controls power supply of
 the AC and DC ground/flight network.
 ON: This network is supplied in priority as follows:

 -by the aircraft network if it is energized,
 - or by the electrical ground power unit, via the external power

 receptacle. OFF: This network is supplied by the main electrical network.
 B. Central Warning System
 (Ref. Fig. 006)
 The block diagram of the electrical generation appears on the lower ECAM
 display unit (Ref. 24-27-00).

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 C. Centralized Fault Display System (CFDS) Line maintenance of the electronic systems is based on the use of the CFDS. The purpose of the CFDS is to give to maintenance technicians a central maintenance aid. The CFDS enables intervention at system or subsystem level from the Multipurpose Control and Display Units (MCDUs) located in the cockpit. From the MCDUs it is possible:
 -
to read the maintenance information,

 -
to initiate various tests.

 The electrical components connected to the CFDS are:
 - the GPCU,
 - the BCLs,
 - the emergency GCU,
 - the TRs.
 The GPCU and BCLs can memorize fault codes and communicate with the CFDIU
 via ARINC 429 buses.
 The emergency GCU and the three TRs are connected to the CFDIU by a
 discrete link: it is thus possible to know only the status of these
 systems (OK or faulty) during SYSTEM REPORT/TEST sequence.
 NOTE : The GCU1, the GCU2 and the APU GCU are continuously monitored by____
 the GPCU.
 The GPCU can then transmit to the CFDIU all the failure messages
 corresponding to the failure codes recorded by these GCUs and the
 GPCU. 
R  **ON A/C 401-499, 
R  C. Centralized Fault Display System (CFDS) 
R  Line maintenance of the electronic systems is based on the use of the 
R  CFDS. 
R  The purpose of the CFDS is to give to maintenance technicians a central 
R  maintenance aid. The CFDS enables intervention at system or subsystem 
R  level from the Multipurpose Control and Display Units (MCDUs) located in 
R  the cockpit. 
R  From the MCDUs it is possible: 
R  - to read the maintenance information, 
R  - to initiate various tests. 
R  The electrical components connected to the CFDS are: 
R  - the GAPCU, 
R  - the BCLs, 
R  - the emergency GCU, 
R  - the TRs. 
R  The GAPCU and BCLs can memorize fault codes and communicate with the 
R  CFDIU via ARINC 429 buses. 
R  The emergency GCU and the three TRs are connected to the CFDIU by a 
R  discrete link: it is thus possible to know only the status of these 
R  systems (OK or faulty) during SYSTEM REPORT/TEST sequence.

 Lower ECAM Display Unit - ELEC Page
 Figure 006 (SHEET 1)
 1EFF :  ALL  1  24-00-00 Page 36 
1  1  Aug 01/05
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