W DOC AIRBUS | TSM A320F

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

TASK 24-35-00-810-808-A
Loss of the DC Essential Busbar with TR1 and TR2 in Operation

1. Possible Causes
  • wiring
  • HOLDER-FUSE [20PC]
  • CNTOR-DC ESS BUS SUPPLY [4PC]
  • 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 24-35-55-000-001
Removal of the Contactor
AMM 24-35-55-400-001
Installation of the Contactor
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 24-35-00-860-058-A
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) On 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 24-35-00-710-069-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 on the lower ECAM DU:
  • The DC1, DC2 and DC BAT indications are green.
  • The DC ESS indication is amber.
4. Fault Isolation
Subtask 24-35-00-810-071-A ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
   (1) Do a check for a short to ground ASM 246201 of the wiring at:
  • Pin A/G of the DC ESS-BUS supply-contactor (4PC)
  • Pin A/E of the DC ESS-BUS supply-contactor (4PC)
  • Pin A/G of the shed essential-bus (8PH).
     (a) If the wiring is not correct:
  • Repair it.
     (b) If the wiring is correct:
       1 If the fault continues:
Subtask 24-35-00-810-071-B ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
   (1) Do a check for a short to ground ASM 246201 of the wiring at:
  • Pin A/G of the DC ESS-BUS supply-contactor (4PC)
  • Pin A/E of the DC ESS-BUS supply-contactor (4PC)
  • Pin A/G of the shed essential-bus (8PH).
     (a) If the wiring is not correct:
  • Repair it.
     (b) If the wiring is correct:
       1 If the fault continues:
         a If the fault continues:
Subtask 24-35-00-710-070-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.
5. Close-up
Subtask 24-35-00-860-059-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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