R 1EFF : 063-099, 106-149, 153-199, 206-299, 1 24-41-00Page 5 1301-399, 1May 01/05 1 1 1CES 1R AC External Power Control (GAPCU) - Component Location R Figure 001B (SHEET 1)

R 1EFF : 401-499, 1 24-41-00Page 6 1 1 Aug 01/05 1 1 1CES 1R AC External Power Control (GAPCU) - Component Location R Figure 001B (SHEET 2)

R 1EFF : 401-499, 1 24-41-00Page 7 1 1 Aug 01/05 1 1 1CES 1

 AC External Power Control (GPCU) - Component Location
 Figure 002

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-41-00Page 8 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1R **ON A/C 401-499,

R (Ref. Fig. 002A)
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-228, 301-302,
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------1XG GPCU 92VU 121 811 24-41-34 3XG EPC 120VU 212 831 24-41-55 8XG IND LT-EXT PWR/NOT IN USE 108VU 120 824 24-41-00 9XG CAUT LT-EXT PWR/AVAIL 108VU 120 824 24-41-00 10XG P/BSW-ELEC/EXT PWR 35VU 210 831 24-41-00 20XG RCPT-EXT PWR 120 121AL 24-41-51
 **ON A/C 106-149, 229-299, 303-399,
 1XG GPCU 92VU 121 811 24-41-34 3XG EPC 120VU 212 831 24-41-55 8XG IND LT-EXT PWR/NOT IN USE 108VU 120 824 24-41-00 9XG IND LT-EXT PWR/AVAIL 108VU 120 824 24-41-00 10XG P/BSW-ELEC/EXT PWR 35VU 210 831 24-41-00 20XG RCPT-EXT PWR 120 121AL 24-41-51

R **ON A/C 401-499,
R 3XG EPC 120VU 212 831 24-41-55 R 8XG IND LT-EXT PWR/NOT IN USE 108VU 120 824 24-41-00 R 9XG IND LT-EXT PWR/AVAIL 108VU 120 824 24-41-00 R 10XG P/BSW-ELEC/EXT PWR 35VU 210 831 24-41-00 R 20XG RCPT-EXT PWR 120 121AL 24-41-51 R 24XG GAPCU 92 VU 122 24-41-00
R 1EFF : ALL 1 24-41-00Page 9 1 1 Aug 01/05 1 1 1CES 1R AC External Power Control (GAPCU) - Component Location R Figure 002A

 1EFF : 401-499, 1 24-41-00Page 10 1 1 Aug 01/05 1 1 1CES 1

 **ON A/C ALL
 3. System Description__________________ **ON A/C 001-049, 051-099, 101-105, 151-158, 201-209,
 (Ref. Fig. 003) **ON A/C 106-149, 159-199, 210-299, 301-399,
R  (Ref. Fig. 003A) **ON A/C 401-499, 
R R  (Ref. Fig. 003B) **ON A/C 001-049, 051-099, 101-105, 151-199, 201-228, 301-302,
 (Ref. Fig. 004) **ON A/C 106-149, 229-299, 303-399,
R  (Ref. Fig. 004A) **ON A/C 401-499, 
R  (Ref. Fig. 004B) **ON A/C ALL
 A. External Power Receptable One external power receptable (20XG) located foward of the nose gear well enables power supply of the aircraft network up to 90 KVA. This is perfomed by means of a single three-phase, 400 Hz, 115/200 VAC Ground Power Unit (GPU). 

R 1EFF : ALL 1 24-41-00Page 11 1 1 Aug 01/05 1 1 1CES 1

 B. Ground Power Supply The GPU supplies the transfer circuit through the EPC (3XG). The effective supply of the aircraft network by means of the Bus Transfer Contactors (BTC), (Ref. 24-22-00), depends on the availability of the other generation sources and the defined priority order.
 4. Component Description
_____________________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 A. Ground Power Control Unit (GPCU)
 (1) GPCU functions
 The GPCU has three different functions:

 -aircraft power supply control and network protection,
 -system test and self-monitoring relating to these functions
 -provide BITE and messages for the AC generation (GCU's and GPCU).
 NOTE : The GPCU transmits command and data to and receives data from
____ up to the GCUs. The communication is made via RS422 serial data links.
 (a) Control and protection functions
 1 Control Unit Supply
_ The control unit is supplied:
 -
with 115 VAC/400 Hz, directly from the external power receptacle, by the voltage it has to analyse. The GPCU generates 28VDC from this voltage. It is used: for its own needs (internal plus or minus 15 V, plus or minus 5 V and + 28 V supply), to supply the aircraft power supply control and indicating circuits (EPC, EXT PWR pushbutton switch, EXT PWR NOT IN USE indicator light and EXT PWR AVAIL caution light, flight/ground network contactors),

 -
with 28 VDC from the normal aircraft electrical network and

 on the ground only. This dual supply constitutes the 28 V internal supply, peculiar to the control unit.
 2 Controls
_ The GPCU (in association with the EXT PWR pushbutton switch) controls the connection/disconnection of the external power to/from the aircraft electrical system. The necessary controls are achieved by means of relays.
 -The Pin Monitoring Relay (PMR)

 External Power Configuration - Block Diagram
　
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