R **ON A/C 401-499,
R 1XU1 GCU-1 91VU 121 24-22-34 R 1XU2 GCU-2 91VU 121 811 24-22-34 R 3XU1 P/BSW-ELEC/GEN 1 35VU 210 831 24-22-00 R 3XU2 P/BSW-ELEC/GEN 2 35VU 210 831 24-22-00 R 9XU1 GLC-1 120VU 212 831 24-22-55 R 9XU2 GLC-2 120VU 212 831 24-22-55 R 10XU P/BSW-ELEC/BUS TIE 35VU 210 831 24-22-00 R 11XU1 BTC-1 120VU 212 831 24-22-55 R 11XU2 BTC-2 120VU 212 831 24-22-55 R 13XU P/BSW-EMER ELEC PWR/SMOKE DRILL 21VU 211 831 24-22-00 R 24XG GAPCU 92VU 122 24-41-00 R 41XU1 CT-AC, 1 131 831 24-22-00 R 41XU2 CT-AC, 2 133 831 24-22-00 R 50XU1 SENSOR-TDC AC, 1 103VU 126 822 24-22-18 R 50XU2 SENSOR-TDC AC, 2 103VU 126 822 24-22-18

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------R 51XU1 CT 212 24-21-00 R 51XU2 CT 212 24-21-00 R 4000XU IDG 430 24-21-51

R **ON A/C ALL
 3. System Description
__________________
 **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)
 **ON A/C 106-149, 159-199, 210-299, 301-399,
 (Ref. Fig. 003B)

R **ON A/C 401-499,
R (Ref. Fig. 003C)
 **ON A/C ALL
 When the two engines run in normal conditions, generator 1 and generator 2
 supply their own network.
 Generator 1 supplies network 1, including:

 -
AC BUS 1,

 -
AC ESSENTIAL BUS,

 -
AC SHEDDABLE ESSENTIAL BUS.

 Generator 2 supplies network 2, corresponding to AC BUS 2.
 Networks 1 and 2 are supplied in priority order:
 -
by their generator,

 -
by the electrical ground power unit,

 -
by the auxiliary generator,
 - or by the other generator.

 GEN1 and GEN2 pushbutton switches, on the panel 35VU on the overhead panel, control the generators 1 and 2 respectively via the GCU.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 The EGIU transmit the main parameters from the GCU and generators to the ECAM system.

R **ON A/C ALL
 4. Component Description
_____________________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 A. Generator Control Unit The 3 GCUs are identical and interchangeable. The GCU functions (GCU1, GCU2, APU GCU) are selected by Pin Programming. The GCU has four different functions:
 -voltage regulation,

 -
control and protection of the network and the generator,

 -
control of the various indications,

 -system test and self-monitoring.
 Voltage regulation is performed in the analog form, whereas the other
 functions are digital.
 The GCUs are supplied:

 -directly from the PMG, for generator excitation and 28VDC internal and external supply,
 -from the aircraft normal network (28 VDC) for the internal and external
 supply.
 This dual supply constitutes a back up supply.

 (1) Voltage regulation The voltage regulation is performed by regulating the generator excitation current: the voltage is kept at the nominal Point Of Regulation (POR). The POR is located in the electrical power center at the end of the generator feeder, upstream of the line contactor.

 AC Main Generation (Normal Configuration) -General Schematic
 Figure 003

R 1EFF : 001-049, 051-060, 101-102, 201-201, 1 24-22-00Page 17/18 1 1 Aug 01/05 1 1 1CES

 AC Main Generation (Normal Configuration) -General Schematic
 Figure 003A

R 1EFF : 061-099, 103-105, 151-158, 202-209, 1 24-22-00Page 19/20 1 1 Aug 01/05 1 1 1CES

 AC Main Generation (Normal Configuration) -General Schematic
 Figure 003B

R 1EFF : 106-149, 159-199, 210-299, 301-399, 1 24-22-00Page 21/22 1 1 Aug 01/05 1 1 1CES R AC Main Generation (Normal Configuration) -R General Schematic R Figure 003C

R 1EFF : 401-499, 1 24-22-00Page 23/24 1 1 Aug 01/05 1 1 1CES  Analog circuits achieve the regulation. The PMG provides directly the excitation supply via the Generator Control Relay (GCR). The excitation supply is rectified. Then a chopper amplifier (pulse width modulation), protected by a freewheeling diode, controls the excitation supply. The regulation is achieved using a signal proportional to the average of the three line to neutral voltages at the input. NOTE :

 -During an operation in unbalanced rating, the voltage level of the higher phase is limited. This limit has a priority on the regulation of the three phase mean voltage.
　
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