W DOC AIRBUS | TSM A320F

APU GEN Voltage, Frequency and Load Indication Lost or Incorrect

TASK 24-22-00-810-808-A
APU GEN Voltage, Frequency and Load Indication Lost or Incorrect

1. Possible Causes
  • EGIU-2 [22XU2]
  • GEN-APU [8XS]
  • GAPCU [24XG]
  • C/B-APU GEN/EGIU2/115VAC [23XS]
  • wiring
  • GCU-APU [1XS]
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)
ASM 242301
ASM 242302
AMM 24-23-34-000-001
Removal of the GCU-APU
AMM 24-23-34-400-001
Installation of the GCU-APU
AMM 24-23-51-000-001
Removal of the APU Generator
AMM 24-23-51-400-001
Installation of the APU Generator
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
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 24-22-00-860-056-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 24-22-00-710-059-A ** ON A/C NOT FOR ALL
B. Test
ACTION
RESULT
1.On the ECAM control panel:
  • push the ELEC key to get the ELEC page.
On the lower ECAM DU:
  • if the frequency indication is shown in amber, do the trouble shooting given in Para. 4.B.

On the lower ECAM DU:
  • if the frequency or the voltage indication is replaced by amber crosses or the voltage indication is shown in amber, do the trouble shooting given in Para. 4.C.

On the lower ECAM DU:
  • if the load indication is shown in amber or replaced by amber crosses, do the trouble shooting given in Para. 4.D.
Subtask 24-22-00-710-059-B ** ON A/C NOT FOR ALL
B. Test
ACTION
RESULT
1.On the ECAM control panel:
  • push the ELEC key to get the ELEC page.
On the lower ECAM DU:
  • if amber crosses replace the voltage indication or the frequency indication of the APU GEN, or if the load indication is shown in amber or if the load indication is replaced by amber crosses, do the trouble shooting given in Para. 4.B.

On the lower ECAM DU:
  • if amber crosses replace the voltage indication or the frequency indication of the APU GEN or if the voltage indication or the frequency indication shows amber, do the trouble shooting given in Para. 4.C.

On the lower ECAM DU:
  • if amber crosses replace voltage, frequency and load indications, do the trouble shooting given in Para. 4.D.
4. Fault Isolation
Subtask 24-22-00-865-057-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
123VUAPU GEN/EGIU2/115VAC23XSAA08
Subtask 24-22-00-810-057-A ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
   (1) If the fault continues:
Subtask 24-22-00-810-057-B ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
   (1) If the fault continues:
Subtask 24-22-00-810-072-A ** ON A/C NOT FOR ALL
C. If the test confirms the fault:
   (1) If the fault continues:
  • Do a check of the position of the circuit breaker APU GEN/EGIU2/115VAC (23XS).
     (a) If the circuit breaker is open:
       1 If the fault continues:
  • Replace the C/B-APU GEN/EGIU2/115VAC [23XS] .
     (b) If the circuit breaker is closed:
  • Do a check of the wiring between the circuit breaker APU GEN/EGIU2/115VAC (23XS) and the pin AB/1D of the EGIU2 (22XU2) ASM 242301.
       1 If the wiring is not correct:
  • Repair the wiring .
       2 If the wiring is correct:
  • Do a check and repair the wiring between the circuit breaker APU GEN/EGIU2/115VAC (23XS) and the pin A/D of the APU GLC (3XS) ASM 242301.
   (2) If the fault continues:
  • Do a check and repair the wiring ASM 315403 between:
    . the pin B/13A of the EGIU2 (22XU2) and the pin B/10J of the SDAC1 (1WV1)
    . the pin B/13B of the EGIU2 (22XU2) and the pin B/10K of the SDAC1 (1WV1)
    . the pin B/13C of the EGIU2 (22XU2) and the pin B/10J of the SDAC2 (1WV2)
    . the pin B/13D of the EGIU2 (22XU2) and the pin B/10K of the SDAC2 (1WV2).
Subtask 24-22-00-810-072-B ** ON A/C NOT FOR ALL
C. If the test confirms the fault:
   (1) If the fault continues:
     (a) 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 24-22-00-810-072-C ** ON A/C NOT FOR ALL
C. If the test confirms the fault:
   (1) If the fault continues:
  • Do a check of the position of the circuit breaker APU GEN/EGIU2/115VAC (23XS).
     (a) If the circuit breaker is open:
       1 If the fault continues:
  • Replace the C/B-APU GEN/EGIU2/115VAC [23XS] .
     (b) If the circuit breaker is closed:
  • Do a check of the wiring between the circuit breaker APU GEN/EGIU2/115VAC (23XS) and the pin AB/1D of the EGIU2 (22XU2) ASM 242301.
       1 If the check is not correct:
  • Repair the wiring .
       2 If the check is correct:
  • Do a check and repair the wiring between the circuit breaker APU GEN/EGIU2/115VAC (23XS) and the pin 9 of the APU/EXT power contactor module (29XN) ASM 242301.
   (2) If the fault continues:
  • Do a check and repair the wiring ASM 315403 between:
    . The pin B/13A of the EGIU2 (22XU2) and the pin B/10J of the SDAC1 (1WV1)
    . The pin B/13B of the EGIU2 (22XU2) and the pin B/10K of the SDAC1 (1WV1)
    . The pin B/13C of the EGIU2 (22XU2) and the pin B/10J of the SDAC2 (1WV2)
    . The pin B/13D of the EGIU2 (22XU2) and the pin B/10K of the SDAC2 (1WV2).
Subtask 24-22-00-810-073-A ** ON A/C NOT FOR ALL
D. If the test confirms the fault:
   (1) If the fault continues:
  • do a check of the wiring between:
    . the pin A/2B of the APU GCU (1XS) and the pin B/9D of the EGIU2 (22XU2),
    . the pin A/2C of the APU GCU (1XS) and the pin B/9C of the EGIU2 (22XU2).
    Then make sure that the ground wire is correctly connected to the pin B/10D of the EGIU2 (22XU2) ASM 242302.
   (2) If the fault continues:
   (3) If the fault continues:
  • do a check and repair the wiring ASM 315403 between:
    . the pin B/13A of the EGIU2 (22XU2) and the pin B/10J of the SDAC1 (1WV1)
    . the pin B/13B of the EGIU2 (22XU2) and the pin B/10K of the SDAC1 (1WV1)
    . the pin B/13C of the EGIU2 (22XU2) and the pin B/10J of the SDAC2 (1WV2)
    . the pin B/13D of the EGIU2 (22XU2) and the pin B/10K of the SDAC2 (1WV2)
Subtask 24-22-00-810-073-B ** ON A/C NOT FOR ALL
D. If the test confirms the fault:
  • 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 24-22-00-710-060-A
E. 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 APU GEN box:
  • the normal electrical parameters come into view.
5. Close-up
Subtask 24-22-00-860-057-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 04:26:35 UTC
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