W DOC AIRBUS | TSM A320F

External Power Voltage Incorrect or Lost and Frequency Lost

TASK 24-22-00-810-806-A
External Power Voltage Incorrect or Lost and Frequency Lost

1. Possible Causes
  • EGIU-1 [22XU1]
  • C/B-EXT PWR/EGIU1/115VAC [23XG]
  • wiring
  • GAPCU [24XG]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 24-00-00-810-803-A
Circuit Breaker Tripped and/or C/B TRIPPED Warning
AMM 24-22-33-000-001
Removal of the EGIU-1(2)
AMM 24-22-33-400-002
Installation of the EGIU-1(2)
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)
ASM 315403
AMM 31-60-00-860-001
EIS Start Procedure
AMM 31-60-00-860-002
EIS Stop Procedure
3. Fault Confirmation
Subtask 24-22-00-860-052-A
A. Job Set-up
   (1) Aircraft Maintenance Configuration
     (a) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
     (b) Do the EIS start procedure (Lower ECAM DU only) AMM 31-60-00-860-001.
Subtask 24-22-00-710-055-A
B. Test
ACTION
RESULT
1.On the ECAM control panel:
  • push the ELEC key to get the ELEC page.
On the lower ECAM DU:
  • amber crosses replace the VAC indication or the indication shows amber or amber crosses replace the frequency indication.
4. Fault Isolation
Subtask 24-22-00-865-055-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
123VUEXT PWR/EGIU1/115VAC23XGAA07
Subtask 24-22-00-810-055-A ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
   (1) If the fault continues:
  • Do a check of the position of the circuit breaker (23XG).
     (a) If the circuit breaker (23XG) is open:
       1 If the fault continues:
  • Replace the C/B-EXT PWR/EGIU1/115VAC [23XG] .
     (b) If the circuit breaker (23XG) is closed:
  • Do a check of the wiring between the circuit breaker EXT PWR/EGIU1/115VAC (23XG) and the pin AB/1D of the EGIU1 (22XU1) ASM 244101.
       1 If the wiring is not correct:
  • Repair the wiring .
       2 If the wiring is correct:
  • Do a check of the wiring between the circuit breaker EXT PWR/EGIU1/115VAC (23XG) and the first branch point ASM 244101.
   (2) If the fault continues:
  • Do a check and repair the wiring ASM 315403 between:
    . the pin B/13A of the EGIU1 (22XU1) and the pin E/10A of the SDAC1 (1WV1)
    . the pin B/13B of the EGIU1 (22XU1) and the pin E/10B of the SDAC1 (1WV1)
    . the pin B/13C of the EGIU1 (22XU1) and the pin E/10A of the SDAC2 (1WV2)
    . the pin B/13D of the EGIU1 (22XU1) and the pin E/10B of the SDAC2 (1WV2).
Subtask 24-22-00-810-055-B ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
   (1) If the fault continues:
  • do a check and repair the wiring ASM 315403 between:
    . the pin A/8J of the GAPCU (24XG) and the pins B/10J, E/10A of the SDAC 1 (1WV1)
    . the pin A/8H of the GAPCU (24XG) and the pins B/10K, E/10B of the SDAC 1 (1WV1)
    . the pin A/8F of the GAPCU (24XG) and the pins B/10J, E/10A of the SDAC 2 (1WV2)
    . the pin A/7F of the GAPCU (24XG) and the pins B/10K, E/10B of the SDAC 2 (1WV2).
Subtask 24-22-00-710-056-A
C. Do this test to make sure that the system operates correctly:
ACTION
RESULT
On the ECAM control panel:
  • push the ELEC key to get the ELEC page.
On the lower ECAM DU:
  • the ELEC page comes into view.
    In the EXT PWR box:
  • the normal electrical parameters come into view.
5. Close-up
Subtask 24-22-00-860-053-A
A. Put the aircraft back to its initial configuration.
   (1) Do the EIS stop procedure
AMM 31-60-00-860-002.
   (2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:26:34 UTC
"WTRUIB" 2025