W DOC AIRBUS | TSM A320F

Loss of the DC Essential Busbar with TR1 and TR2 in Operation

TASK 24-35-00-810-806-A
Loss of the DC Essential Busbar with TR1 and TR2 in Operation

1. Possible Causes
  • wiring
  • HOLDER-FUSE [20PC]
  • MODULE-DC BUS 1 CNTOR [13PN]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 24-35-00-960-801
Replacement of the Fuse 20PC1
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 24-61-58-000-001
Removal of the DC Bus 1 Contactor Module
AMM 24-61-58-400-001
Installation of the DC Bus 1 Contactor Module
ASM 246201
AMM 31-60-00-860-001
EIS Start Procedure
AMM 31-60-00-860-002
EIS Stop Procedure
3. Fault Confirmation
Subtask 24-35-00-860-054-A
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) On the ELEC panel 35VU, push the BAT1 and BAT2 pushbutton switches:
  • The OFF legend goes off.
   (3) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
Subtask 24-35-00-710-065-A
B. Test
   (1) Do this test:
ACTION
RESULT
On the ECAM control panel:
  • Push the ELEC key to get the ELEC page.
The ELEC page comes into view with:
On the lower ECAM display unit (DU):
  • The DC1, DC2 and DC BAT indications are in green.
  • The DC ESS indications is in amber.
    On the upper ECAM DU:
  • The ELEC DC EMER CONFIG warning is shown.
4. Fault Isolation
Subtask 24-35-00-810-069-A ** ON A/C NOT FOR ALL
A. If the Test Confirms the Fault:
   (1) Do a check for short to ground of the wiring ASM 246201 at:
  • Pin A/G of DC ESS-BUS supply contactor (4PC)
  • Pin A/E of DC ESS-BUS supply contactor (4PC)
  • Pin A/G of DC SHED ESS-BUS (8PH).
     (a) If the wiring is not correct:
  • Repair it.
     (b) If the wiring is correct:
Subtask 24-35-00-810-069-B ** ON A/C NOT FOR ALL
A. If the Test Confirms the Fault:
   (1) Do a check for short to ground of the wiring ASM 246201 at:
  • Pin A/G of DC ESS-BUS supply contactor (4PC)
  • Pin A/E of DC ESS-BUS supply contactor (4PC)
  • Pin A/G of DC SHED ESS-BUS (8PH).
     (a) If the wiring is not correct:
  • Repair it.
     (b) If the wiring is correct:
       1 If the fault continues:
Subtask 24-35-00-710-066-A
B. 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.
The ELEC page comes into view, make sure that:
On the lower ECAM DU:
  • The DC1, DC2, DC BAT and DC ESS indications are shown in green.
    On the upper ECAM DU:
  • The ELEC DC EMER CONFIG warning is not shown.
5. Close-up
Subtask 24-35-00-860-055-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 04:26:46 UTC
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