W DOC AIRBUS | TSM A320F

Failure of the External Power Feeders or External Power POR-Wiring

TASK 24-41-00-810-822-A
Failure of the External Power Feeders or External Power POR-Wiring

1. Possible Causes
  • feeders
  • wiring
  • GAPCU [24XG]
  • external power
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002
De-energize the Aircraft Electrical Circuits Supplied from the External Power
ASM 244101
AMM 24-41-34-000-001
Removal of the Ground Power Control Unit (GPCU)
AMM 24-41-34-400-001
Installation of the Ground Power Control Unit (GPCU)
3. Fault Confirmation
Subtask 24-41-00-710-071-A ** ON A/C NOT FOR ALL
A. Test
   (1) Energize the Aircraft Electrical Circuits from the external power AMM 24-41-00-861-002.
4. Fault Isolation
Subtask 24-41-00-810-064-B ** ON A/C NOT FOR ALL
A. If it is not possible to connect the external power source to the aircraft electrical network and if the fault symptom is identified by the CFDS message WRG: EXT PWR FEEDER/WRG: POR/GAPCU (24XG):
  • do a check of the external power feeders ASM 244101 for a correct phase connection between:
    . terminal A of the external power receptacle (20XG) and terminal K of the EPC (3XG)
    . terminal B of the external power receptacle and terminal L of the EPC
    . terminal C of the external power receptacle and terminal M of the EPC.
   (1) If the feeders are not correct:
  • connect the feeders as necessary to get the correct phase sequence.
   (2) If the feeders are correct:
  • do a check of the Point-Of-Regulation (POR) sense wiring ASM 244101 for a correct phase connection between:
    . terminal J of the EPC (3XG) and pin B/15J of the GAPCU (phase A)
    . terminal H of the EPC and pin B/14J of the GAPCU (phase B)
    . terminal G of the EPC and pin B/13J of the GAPCU (phase C).
     (a) If the wiring is not correct:
  • connect the wiring as necessary to get the correct phase sequence.
     (b) If the wiring is correct:
     (c) If the fault continues:
  • replace the external power source.
Subtask 24-41-00-860-050-A ** ON A/C NOT FOR ALL
B. Make sure that the aircraft electrical circuits operate correctly in external power configuration.
   (1) Energize the Aircraft Electrical Circuits from the external power AMM 24-41-00-861-002.
   (2) De-energize the aircraft electrical circuits from the external power AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:26:54 UTC
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