R **ON A/C ALL
 3. System Description
__________________
 A. AC Generation and Distribution
125 812 24-34-51 126 822 24-28-51 125 812 24-24-34 148 734 24-24-51 120 121AL 24-41-51 92VU 122 24-41-00 310 24-23-51 91VU 121 811 24-22-34 91VU 121 811 24-22-34 430 24-21-51

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 004) R **ON A/C 401-499, R (Ref. Fig. 004A)

 Control and Indicating - Component Location
 Figure 003A

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1

 Control and Indicating - Component Location
 Figure 003B

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 AC Generation and Distribution - Schematic
 Figure 004

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-00-00Page 21 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1R AC Generation and Distribution - Schematic R Figure 004A

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 (1) Generation
 (a) Main generator and APU GEN drive:
 -Each main generator is driven by an engine HP compressor via an accessory gearbox and an integrated hydromechanical speed regulator which transforms the engine variable speed into constant speed for the generator. In the event of mechanical failure, the IDG pushbutton switch protected by a guard and located on the ELEC panel on the overhead panel, serves to disconnect the IDG. The disconnection mechanism can be reset on the ground only with the engine shut down.
 -The APU directly drives the APU GEN at constant speed. This maintains the generator frequency constant.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (b) Main Generator, APU GEN and Generator Control Unit (GCU) Each generator is controlled, via a GCU, by a GEN pushbutton switch located on the ELEC panel on the overhead panel. The leading particulars of the generator are:
 -nominal power: 90 KVA at the POR,
 -voltage: 115 V/200 V, three-phase, 400 Hz. The main functions of the GCU are:
 -
to regulate the generator voltage by the field current,

 -
to protect the network and the generator by control of the associated GLC and the generator field current,

 -
to provide BITE information to the Ground Power Control Unit (GPCU),

 -
to control the warnings associated with the corresponding

 channel. Each GCU includes a BITE and self monitoring system which:
 -analyzes most of the faults that affect the channel,
 -memorizes the corresponding data in a non-volatile memory. In addition the lower ECAM display unit receives the electrical parameters and warnings dealing with the channel concerned.

R  **ON A/C 401-499, 
R  (b) Main Generator, APU GEN, Generator Control Unit (GCU) and Ground 
R  and Auxiliary Power Control Unit (GAPCU). 
R  Each generator is controlled, via a GCU and via the GAPCU for the 
R  APU generator, by a GEN pushbutton switch located on the ELEC 
R  panel on the overhead panel. 
R  The leading particulars of the generator are: 
R  - nominal power: 90 KVA at the POR, 
R  - voltage: 115 V/200 V, three-phase, 400 Hz. 
R  The main functions of the GCU and GAPCU are: 
R  - to regulate the generator voltage by the field current, 
R  - to protect the network and the generator by control of the 
R  associated GLC and the generator field current, 
R  - to provide BITE information to the Centralized Fault Display 
R  System (CFDS), 
R  - to control the warnings associated with the corresponding 
R  channel. 
R  Each GCU and the GAPCU include a BITE and self monitoring system 
R  which: 
R  - analyzes most of the faults that affect the channel, 
R  - memorizes the corresponding data in a non-volatile memory. 
R  In addition the lower ECAM display unit receives the electrical 
R  parameters and warnings dealing with the channel concerned. 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 This data transmission is effected via the Electrical Generation
 Interface Unit (EGIU).
 (c) Electrical Generation Interface Unit (EGIU)
 The main function of the EGIU is to process the parameters from
 the GCU and associated generator. The EGIU then transmits the
 information to the cockpit (ECAM) via the System Data Acquisition
　
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