Loss of the Essential TR

TASK 24-60-00-810-817-A
Loss of the Essential TR

1. Possible Causes

TR-ESS [1PE]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 243401
AMM 24-34-51-000-001	Removal of the Essential Transformer Rectifier
AMM 24-34-51-400-001	Installation of the Essential Transformer Rectifier
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 31-32-00-860-004	Procedure to Get Access to the SYSTEM REPORT/TEST/ELEC Page
AMM 31-60-00-860-001	EIS Start Procedure
AMM 31-60-00-860-002	EIS Stop Procedure

3. Fault Confirmation
Subtask 24-60-00-865-063-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
123VU	TR1/SPLY	2PU1	AB10

Subtask 24-60-00-860-078-A

B. 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.
(c) On the MCDU, get the SYSTEM REPORT/TEST/ELEC page AMM 31-32-00-860-004.

Subtask 24-60-00-710-081-A

C. Test

ACTION	RESULT
1.On the ECAM control panel: push the STS key.	On the upper ECAM DU: these warnings come into view: . ELEC TR1 FAULT, . ELEC TR2 FAULT, . ELEC ESS TR FAULT, . ELEC ESS BUS FAULT.
	On the lower ECAM DU, on the STATUS page: the DC BUS TIE indication comes into view.
2.In the AC power center 123VU: open the circuit breaker 2PU1.
3.On the MCDU: push the line key adjacent to the TR3 indication.
Or (if the CFDS is not available): In the relay box 103VU: push TR RESET pushbutton switch (15PU).
4.In the AC power center 123VU: close the circuit breaker (2PU1)

4. Fault Isolation
Subtask 24-60-00-810-070-A

A. If the test confirms the fault:

replace the TR-ESS [1PE] AMM 24-34-51-000-001 and AMM 24-34-51-400-001.

(1) If the fault continues:

do a check and repair the wiring between respectively:
. the pin B/J of the ESS TR and the pin AB/7A of the CFDIU (1TW)
. the pin 6 of the pushbutton switch (15PU) and the first branch point
. the pin 5 of the TR RESET pushbutton switch (15PU) and the ground
. the pin B/E of the ESS TR and the pin AA/7K of the CFDIU ASM 243401.

Subtask 24-60-00-710-082-A

B. 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: no warning comes into view.

5. Close-up
Subtask 24-60-00-860-079-A

A. Put the aircraft back to its initial configuration.
(1) On the MCDU, push the line key adjacent to the RETURN indication until the CFDS menu page comes into view.
(2) Do the EIS stop procedure
AMM 31-60-00-860-002.
(3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:26:59 UTC