Unwanted Warning from the AC Busbars

TASK 24-50-00-810-814-A
Unwanted Warning from the AC Busbars

1. Possible Causes

RELAY-BUS 1XP CTL [15XC]
RELAY-BUS 2XP CTL [16XC]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 242501
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 31-60-00-860-001	EIS Start Procedure

3. Fault Confirmation
Subtask 24-50-00-860-074-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 24-50-00-710-076-A

B. Test
(1) 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 ESS BUSES ON BAT warning comes into view.

4. Fault Isolation
Subtask 24-50-00-810-063-A

A. If the test confirms the fault:

replace the RELAY-BUS 1XP CTL [15XC] and RELAY-BUS 2XP CTL [16XC] .

(1) If the fault continues:

do a check and repair the wiring between respectively:
. the circuit breaker (17XN1) and the pin A/X1 of the relay (15XC)
. the pin A/X2 of this relay and the ground
. the circuit breaker (17XN2) and the pin A/X1 of the relay (16XC)
. the pin A/X2 of this relay and the ground ASM 242501

Subtask 24-50-00-710-077-A

B. Do this test to brake 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 upper ECAM display unit: no message comes into view.

5. Close-up
Subtask 24-50-00-860-075-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 04:26:56 UTC