W DOC AIRBUS | AMM A320F

AC GROUND SERVICE BUS CONTROL - DESCRIPTION AND OPERATION


** ON A/C NOT FOR ALL
1. General
AC ground/flight distribution network can be supplied:
  • either normally from the aircraft network,
  • or directly by the ground power unit upstream of the external power contactor, in ground service configuration.
In ground service configuration this network can be supplied without energizing the whole aircraft network.
** ON A/C NOT FOR ALL
2. Component Location
FIN FUNCTIONAL
DESIGNATION
PANEL ZONE ACCESS
DOOR
ATA REF
** ON A/C ALL
12XX CNTOR-AC GND SVCE SPLY 120VU 212 24-42-55
14XX CNTOR-AC & DC GND SVCE SPLY 120VU 212 24-42-55
** ON A/C NOT FOR ALL
16XX CNTOR-SVCE BUS 2 120VU 212 24-42-00
** ON A/C ALL
5XX SW-MAINT BUS/ON 2000VU 223 24-42-00
** ON A/C NOT FOR ALL
3. System Description
The AC ground/flight network comprises the sub-busbars:
  • 212XP,
  • 214XP,
  • 216XP-C.
** ON A/C NOT FOR ALL
4. Operation/Control and Indicating
Supply selection for ground service network is controlled from panel 2000VU, MAINT BUS switch:
  • one position corresponds to the normal supply configuration,
  • the other position controls the ground service network supply from the ground power unit, if available. This position is electromagnetically latched.
The switch returns to the normal position in case of voluntary or automatic (GPCU protections) unlatching of the ground power unit.
The normal supply configuration takes precedence over the ground service configuration.
NOTE: Overheat of TR2 results in the automatic unlatching of MAINT BUS switch. This entails the cut-off of the ground distribution network.
Supply selection for ground service network is controlled from panel 2000VU, MAINT BUS switch:
  • one position corresponds to the normal supply configuration.
  • the other position controls the ground service network supply from the ground power unit, if available and if the "COMMERCIAL" pushbutton switch (commercial load shed) is pressed. This position is electromagnetically latched.
The switch returns to the normal position in case of voluntary or automatic (GPCU protections) unlatching of the ground power unit.
The normal supply configuration takes precedence over the ground service configuration.
NOTE: Overheat of TR2 results in the automatic unlatching of MAINT BUS switch. This entails the cut-off of the ground distribution network.
Supply selection for ground service network is controlled from panel 2000VU, MAINT BUS switch:
  • one position corresponds to the normal supply configuration.
  • the other position controls the ground service network supply from the ground power unit, if available and if the "COMMERCIAL" pushbutton switch (commercial load shed) is pressed. This position is electromagnetically latched.
The switch returns to the normal position in case of voluntary or automatic (GAPCU protections) unlatching of the ground power unit.
The normal supply configuration takes precedence over the ground service configuration.
NOTE: Overheat of TR2 results in the automatic unlatching of MAINT BUS switch. This entails the cut-off of the ground distribution network.
[Rev.10 from 2021] 2026.04.01 05:50:30 UTC