Unwanted Tripping of a Circuit Breaker on the Overhead C/B Panel

TASK 31-54-00-810-925-A
Unwanted Tripping of a Circuit Breaker on the Overhead C/B Panel

1. Possible Causes

SDAC-1 [1WV1]
SDAC-2 [1WV2]
wiring
circuit breaker

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 315402
ASM 315406
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
AMM 31-60-00-860-002	EIS Stop Procedure

3. Fault Confirmation
Subtask 31-54-00-860-057-A

A. Do the EIS start procedure (upper ECAM DU and lower ECAM DU only) AMM 31-60-00-860-001.

Subtask 31-54-00-710-284-A

B. Make sure that the ECAM warning C/B TRIPPED ON OVHD PNL is shown on the upper ECAM DU.

4. Fault Isolation
Subtask 31-54-00-865-141-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	SDAC/1/SPLY	3WV	F04
121VU	EIS/SDAC/2/SPLY	2WV	Q06

Subtask 31-54-00-810-174-A

B. If the upper ECAM DU gives the ECAM warning C/B TRIPPED ON OVHD PNL:

do a check of the status of the circuit breakers on the overhead C/B panel (49VU).

(1) If all the circuit breakers are closed:
(a) Open the circuit breaker SDAC/1/SPLY (3WV).
1 If the ECAM warning C/B TRIPPED ON OVHD PNL goes out of view:

replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
close the circuit breaker SDAC/1/SPLY (3WV).

2 If the ECAM warning C/B TRIPPED ON OVHD PNL stays in view:

do the actions given in Para. 4.B.(1)(b).

(b) Open the circuit breaker EIS/SDAC/2/SPLY (2WV).
1 If the ECAM warning C/B TRIPPED ON OVHD PNL goes out of view:

replace the SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
close the circuit breaker EIS/SDAC/2/SPLY (2WV).

2 If the ECAM warning C/B TRIPPED ON OVHD PNL stays in view:

do a check and repair the wiring ASM 315402:
. from SDAC1 (1WV1) connector AD/12A to the first terminal block.
. from SDAC2 (1WV2) connector AD/12A to the first terminal block.

a If the fault continues:

do a check for a grounded circuit breaker .
replace the grounded circuit breaker.

(2) If one circuit breaker or more are open:

NOTE: On the ground, you must not close a tripped circuit breaker without trouble shooting of the related system.

(a) Do an isolation check of the wiring between the circuit breaker and the related system ASM 315406:
1 If there is an isolation fault:

repair the wiring between the circuit breaker and the related system.
Close the tripped circuit breaker(s).

Subtask 31-54-00-860-063-A

C. Test
(1) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only) AMM 31-60-00-860-001.
(2) Make sure that the ECAM warning is out of view.
(3) Do the EIS stop procedure AMM 31-60-00-860-002.

[Rev.8 from Aug 2018] 2026.04.04 04:30:32 UTC