Failure of the Connection between the Busbar 2XP and the TR2

TASK 24-60-00-810-808-A
Failure of the Connection between the Busbar 2XP and the TR2

1. Possible Causes

CNTOR-TR 2/AC SVCE BUS NORM SPLY [14PU]
RELAY-GND/FLT SELECT CTL [7XX]
CNTOR-AC & DC GND SVCE SPLY [14XX]
wiring
C/B-TR2/214XP/SPLY [2PU2]

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
ASM 243201
AMM 24-32-55-000-001	Removal of the TR 1 and TR 2 Contactors and the TR 2/AC Service Bus Normal Supply Contactor
AMM 24-32-55-400-001	Installation of the TR 1 and TR 2 Contactors and the TR 2/AC Service Bus Normal Supply 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
ASM 244201
AMM 31-60-00-860-001	EIS Start Procedure

3. Fault Confirmation
Subtask 24-60-00-860-062-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 24-60-00-710-064-A

B. Test
Do this test:

ACTION	RESULT
1.On the ECAM control panel: push the ELEC key to get the ELEC page.	On the upper ECAM display unit: the ELEC TR2 FAULT warning comes into view.
2.On the FWD attendant panel 120RH: push the CABIN WDO and CABIN CLG pushbutton switches.	In the cabin: the ceiling FWD and AFT lights (right hand) and the window FWD and AFT lights (left hand) remain off.

4. Fault Isolation
Subtask 24-60-00-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	ELEC/AC PWR/SVCE/CTL	3XX	V29
123VU	TR2/214XP/SPLY	2PU2	AB04

Subtask 24-60-00-810-057-A ** ON A/C NOT FOR ALL

B. If the test confirms the fault:

Do a check of the status of the circuit breaker (2PU2).

(1) If this circuit breaker is closed:

Replace the CNTOR-TR 2/AC SVCE BUS NORM SPLY [14PU] AMM 24-32-55-000-001 and AMM 24-32-55-400-001.

(a) If the fault continues:

Replace the RELAY-GND/FLT SELECT CTL [7XX] .

(b) If the fault continues:

Replace the CNTOR-AC & DC GND SVCE SPLY [14XX] .

Do a check and repair the wiring between respectively:
. the circuit breaker (3XX) and the pin B/3 of the TR2/AC SVCE BUS normal supply contactor (14PU)
. the pin B/5 of the contactor (14PU) and the ground ASM 243201 and ASM 244201.

(d) If the fault continues:

Do a check of the wiring for a short to ground between respectively the pins A/2, B/2, C/2 of the circuit breaker (2PU2) and the pins A/D, A/E, A/F of the TR2/AC SVCE BUS normal supply contactor (14PU) ASM 243201.

1 If the wiring is not correct:

Repair the wiring .

2 If the wiring is correct:

Replace the C/B-TR2/214XP/SPLY [2PU2] .

(2) If the circuit breaker is open:

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

(a) If the fault continues:

Replace the C/B-TR2/214XP/SPLY [2PU2] .

Subtask 24-60-00-810-057-B ** ON A/C NOT FOR ALL

B. If the fault continues:

Do a check of the status of the circuit breaker (2PU2).

(1) If this circuit breaker is closed:

Replace the CNTOR-TR 2/AC SVCE BUS NORM SPLY [14PU] AMM 24-32-55-000-001 and AMM 24-32-55-400-001.

(a) If the fault continues:

Replace the RELAY-GND/FLT SELECT CTL [7XX] .

(b) If the fault continues:

Replace the CNTOR-AC & DC GND SVCE SPLY [14XX] .

Do a check and repair the wiring between respectively:
. the circuit breaker (3XX) and the pin B/3 of the TR2/AC SVCE BUS normal supply contactor (14PU)
. the pin B/5 of the contactor (14PU) and the ground ASM 243201 and ASM 244201.

(d) If the fault continues:

Do a check of the wiring for a short to ground between respectively the pins A/2, B/2, C/2 of the circuit breaker (2PU2) and the pins 22, 23, 24 of the module 20XX ASM 243201.

1 If the wiring is not correct:

Repair it.

2 If the wiring is correct:

Replace the C/B-TR2/214XP/SPLY [2PU2] .

(2) If the circuit breaker is open:

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

(a) If the fault continues:

Replace the C/B-TR2/214XP/SPLY [2PU2] .

Subtask 24-60-00-710-065-A

C. Do the test given in Para. 3. to make sure that no warning message comes into view on the upper ECAM display unit, and that the cabin lights come on when the related pushbutton switches are pushed.

5. Close-up
Subtask 24-60-00-860-063-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) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002

[Rev.8 from Aug 2018] 2026.04.04 04:26:58 UTC