Overload on the Electrical Network of the Generator 1

TASK 24-20-00-810-918-A
Overload on the Electrical Network of the Generator 1

1. Possible Causes

[1MC]
[12MC]
IDG-ENG 1 [4000XU1]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 245102
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-028	Engine Shutdown
AMM 71-00-00-710-043	Normal Engine Automatic Start Procedure
AMM 71-00-00-860-814	Shutdown of the Engine
AMM 71-00-00-860-823	Start the Engine (Normal Automatic Start)

3. Fault Confirmation
Subtask 24-20-00-860-180-A ** ON A/C NOT FOR ALL

A. Job Set-up
(1) Aircraft Maintenance Configuration
(a) Energize the aircraft electrical circuits from the external power AMM 24-41-00-861-002.
(2) On the ELEC panel 35VU, make sure that the ELEC/GEN 1 pushbutton switch (3XU1) is pushed.
(3) On the ELEC panel 35VU, make sure that the ELEC/GALLEY pushbutton switch (2XA) is pushed (the OFF legend is off).

Subtask 24-20-00-700-119-B ** ON A/C NOT FOR ALL

B. Test
(1) Start the engine 1 AMM 71-00-00-710-003.
(2) On the upper ECAM DU, the warning GEN 1 OVERLOAD is shown.

4. Fault Isolation
Subtask 24-20-00-865-062-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
123VU	BUS 1/131XP-A/SPLY	5XN1	AB12
123VU	BUS 1/103XP/SPLY	3XN1	AB11
123VU	TR1/SPLY	2PU1	AB10
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	AC ESS/BUS ON/BUS 1	1XC	AC12
123VU	BUS 1/101XP/SPLY	1XN1	AD11
123VU	AVNCS VENT/BLOWER/FAN	1HQ	AD10
123VU	BUS 1/110XP/SPLY	7XN1	AF11
123VU	ANTI ICE/L/WHSLD	1DG1	AF10

Subtask 24-20-00-810-208-F ** ON A/C NOT FOR ALL

B. If the test confirms the fault:

in the AC power center panel 123VU, do a check of the circuit breakers 1MC and 12MC.

(1) If the circuit breakers 1MC and/or 12MC are open:

replace the [1MC] and/or the [12MC] .

(2) If the circuit breakers 1MC and 12MC are closed:

on the AC power center panel 123VU, do a check of the status of the circuit breakers 5XN1, 3XN1, 7XN1, 1DG1, 1XC, 2701GJ, 1HQ, 1XN1 and 2PU1.

(a) If one or more circuit breaker(s) is(are) open:

do a check of the loads downstream of the open circuit breaker(s) for a short to ground or a defective component.

(b) If all the circuit breakers are closed:

stop the engine 1 AMM 71-00-00-710-003
de-energize the aircraft electrical network from the external power AMM 24-41-00-862-002 and do the procedure that follows.

Subtask 24-20-00-810-208-G ** ON A/C NOT FOR ALL

B. If the test confirms the fault:

In the AC power center panel 123VU, do a check of the circuit breakers 1MC and 12MC.

(1) If the circuit breakers 1MC and/or 12MC are open:

Replace C/B-FWD GALLEY/FEEDER C [1MC] and/or C/B-AFT GALLEY/FEEDER B [12MC] .

(2) If the circuit breakers 1MC and 12MC are closed:

On the AC power center panel 123VU, do a check of the status of the circuit breakers 5XN1, 3XN1, 7XN1, 1DG1, 1XC, 2701GJ, 1HQ, 1XN1 and 2PU1.

(a) If one or more circuit breaker(s) is(are) open:

Do a check of the loads downstream of the open circuit breaker(s) for a short to ground or a defective component.

(b) If all the circuit breakers are closed:

Stop the IDG-ENG 1 [4000XU1] AMM 71-00-00-860-814
De-energize the aircraft electrical network from the external power AMM 24-41-00-862-002 and do the procedure that follows.

Subtask 24-20-00-810-209-D ** ON A/C NOT FOR ALL

C. Do a check of the AC/DC main power center 120VU:

Open the AC/DC main power center 120VU and do a check of the wiring for a short circuit or a short to ground between downstream of the GLC 1 (load side) and the loads ASM 245102.

(1) If the wiring is not correct:

Repair or replace as necessary.

(2) If the wiring is correct:

Do a check of the feeders for a short to ground, a short circuit or a related defective equipement between the pins 4, 5 and 6 of the generator 1 contactor module (30XN1) and the load side ASM 245102.

(a) If there is a short to ground:

Repair or replace as necessary.

(b) If there is no short to ground:

Energize the aircraft electrical network from the external power AMM 24-41-00-861-002.
Start the engine 1 only AMM 71-00-00-710-043 and close one by one the circuit breakers until the warning GEN 1 OVERLOAD is shown. Repair the wiring or the component of the defective circuit.

Subtask 24-20-00-710-137-B ** ON A/C NOT FOR ALL

D. Do this test to make sure that the failure is repaired:
(1) Make sure that the circuit breakers are closed (if the circuit breakers are not closed, close them).
(2) Energize the aircraft electrical circuit from the external power AMM 24-41-00-861-002.
(3) On the ELEC panel 35VU, make sure that the ELEC/GALLEY pushbutton switch is pushed.
(4) Start engine 1 AMM 71-00-00-860-823.
(5) After five minutes, make sure that, on the upper ECAM DU, the warning GEN 1 OVERLOAD is not shown.
(6) Stop engine 1 AMM 71-00-00-860-814.

Subtask 24-20-00-710-137-F ** ON A/C NOT FOR ALL

D. Do this test to make sure that the failure is repaired:
(1) Make sure that the circuit breakers are closed (if the circuit breakers are not closed, close them).
(2) Energize the aircraft electrical circuit from the external power A AMM 24-41-00-861-002.
(3) On the ELEC panel 35VU, make sure that the ELEC/GALLEY pushbutton switch is pushed.
(4) Start the engine 1 AMM 71-00-00-710-003.
(5) After five minutes, make sure that, on the upper ECAM DU, the warning GEN 1 OVERLOAD is not shown.
(6) Stop the engine 1 AMM 71-00-00-710-028.

5. Close-up
Subtask 24-20-00-860-162-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) De-energize the aircraft electrical circuits from the external power AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:39:02 UTC