Unwanted AC ESS SHED FAULT Warning

TASK 24-50-00-810-801-A
Unwanted AC ESS SHED FAULT Warning

1. Possible Causes

SDAC-1 [1WV1]
SDAC-2 [1WV2]
RELAY-BUS 801XP CTL (7XH)
wiring
C/B-ELEC/AC BUS/8XP/MONG [6XH]

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 24-41-00-861-002	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 245201
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC
AMM 31-60-00-860-001	EIS Start Procedure

3. Fault Confirmation
Subtask 24-50-00-860-050-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 (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.

Subtask 24-50-00-865-050-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/MCDU/1	11CA1	B01
49VU	LIGHTING/XFMR/115V.5V/ESS BUS	29LP	H03
122VU	LIGHTING/TST/BOARD/SPLY	30LP	X06

Subtask 24-50-00-710-050-A

C. Test
(1) Do this test:

ACTION	RESULT
1.On the ECAM control panel: Push the ELEC key to get the ELEC page:	On the lower ECAM DU, on the ELEC page: The normal configuration comes into view with the SHED indication shown in amber below the AC ESS busbar.
	On the upper ECAM DU: The ELEC AC ESS BUS SHED FAULT warning comes into view.
2.On the panel 11VU, on the MCDU1: Adjust the brightness of the MCDU screen.	On the panel 11VU: The MCDU1 is on.
3.On the panel 25VU: Set the ANN LT switch to TEST.	On the overhead panel: All the annunciators come on with maximum brightness.

4. Fault Isolation
Subtask 24-50-00-810-050-A

A. If the test confirms the fault:

Do a check of the status of the ELEC/AC BUS/8XP/MONG circuit breaker (6XH).

(1) If the circuit breaker is closed:

Remove SDAC1 AMM 31-55-34-000-001.

(a) If the fault does not continue:

Replace SDAC-1 [1WV1] AMM 31-55-34-400-001.

(b) If the fault continues:

Install SDAC1 AMM 31-55-34-400-001.
Remove SDAC2 AMM 31-55-34-000-001.

1 If the fault does not continue:

Replace SDAC-2 [1WV2] AMM 31-55-34-400-001.

2 If the fault continues:

Install SDAC2 AMM 31-55-34-400-001.
Replace the RELAY-BUS 801XP CTL (7XH).

a If the fault continues:

Do a check for continuity and repair the wiring between:
. Pin A/B of the BUS 801XP CTL relay (7XH) and the first branch point
. Pin A/4 of the BUS 801XP CTL relay (7XH) and the ground
. The ELEC/AC BUS/8XP/MONG circuit breaker (6XH) and pin A/X of the BUS 801XP CTL relay (7XH)
. Pin A/Z of the BUS 801XP CTL relay (7XH) and the ground ASM 245201.

(2) If the circuit breaker is open:

Do the trouble shooting procedure (Ref. TSM TASK 24-00-00-810-803).

(a) If the fault continues:

Replace the RELAY-BUS 801XP CTL (7XH).

1 If the fault continues:

Replace the C/B-ELEC/AC BUS/8XP/MONG [6XH] .

Subtask 24-50-00-710-051-A

B. Do this test to make sure that the system operates correctly.

ACTION	RESULT
1.On the ECAM control panel: Push the ELEC key to get the ELEC page.	On the lower ECAM DU, on the ELEC page: The normal configuration comes into view.
	On the upper ECAM DU: No message comes into view.

5. Close-up
Subtask 24-50-00-860-051-A

A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
(2) On the MCDU1,
Fully decrease the brightness of the MCDU screen (display off).
(3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:26:55 UTC