DC MAIN DISTRIBUTION - FAULT ISOLATION PROCEDURES
_________________________________________________
TASK 24-61-00-810-801
Loss of the 601PP and 602PP busbars in Normal Configuration
1. Possible Causes_______________
- CNTOR-DC SVCE BUS NORM SPLY (8PN)
- CNTOR-DC SVCE BUS GND SPLY (3PX)
- wiring
- C/B-DC SVCE 6PP SPLY (7PN)
- C/B-ELEC/DC/SVCE/BUS (5PN)
2. Job Set-up Information______________________
A. Referenced Information
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REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from Engine 1(2)
AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
AMM 24-43-55-000-001 Removal of the DC Service Bus Ground Supply Contactor (3PX)
AMM 24-43-55-400-001 Installation of the DC Service Bus Ground Supply Contactor (3PX)
AMM 24-61-55-000-001 Removal of the DC Service Bus Normal Supply Contactor (8PN)
AMM 24-61-55-400-001 Installation of the DC Service Bus Normal Supply Contactor (8PN)
ASM 24-43/01
ASM 24-61/01
3. Fault Confirmation__________________
A. Job Set-UP
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
B. Test
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the overhead panel 25VU: - the CAPT dome lights do not come on.
- put the INT LT/DOME switch in
the BRT position
4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
122VU ELEC/DC/SVCE/BUS 5PN X24 R 124VU DC SVCE/602PP/SPLY 7PN BD01 R
B. If the test confirms the fault:
- do a check of the status of the circuit breaker (7PN).
(1) If the circuit breaker is closed:
- do a check for 28VDC on the pin F of the contactor (8PN) (Ref. ASM 24-61/01).
(a) If there is no 28VDC:
- do a check of the wiring between the circuit breaker (7PN) and the contactor (8PN) (Ref. ASM 24-61/01).
1 If there is no continuity:
_ - repair the wiring.
2 If there is continuity:
_
- replace the C/B-DC SVCE 6PP SPLY (7PN).
(b) If there is 28VBC:
- do a check for 28VDC on the pin 3 of the contactor (8PN) (Ref. ASM 24-61/01).
1 If there is 28VDC:
_
- replace the CNTOR-DC SVCE BUS NORM SPLY (8PN) (Ref. AMM TASK 24-61-55-000-001) and (Ref. AMM TASK 24-61-55-400-001).
2 If there is no 28VDC:
_
- do a check of the wiring between the circuit breaker (5PN) and the pin 3 of the contactor (8PN) (Ref. ASM 24-61/01).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞24-61-00∞∞∞∞∞∞∞∞∞∞Page 202
May 01/05 CES a If there is no continuity:
_
- repair the wiring.
b If there is continuity:
_
- replace the CNTOR-DC SVCE BUS GND SPLY (3PX) (Ref. AMM TASK 24-43-55-000-001) and (Ref. AMM TASK 24-43-55-400-001).
c If the fault continues:
_
- replace the C/B-ELEC/DC/SVCE/BUS (5PN).
(2) If the circuit breaker is open:
- close it.
(a) If it trips:
- do a check for short to ground of the wiring between the circuit breaker (7PN) and the busbars (601PP) and (602PP) (Ref. ASM 24-61/01) and (Ref. ASM 24-43/01).
1 If there is a short to ground:
_
- repair the wiring.
2 If there is no short to ground:
_
- replace the C/B-DC SVCE 6PP SPLY (7PN).
C. Do the test given in Para. 3 and make sure that the CAPT dome lights come on.
5. Close-up
________
A. Put the aircraft back to its initial configuration.
(1) On the overhead panel 25VU, put the INT LT/DOME switch in the OFF position.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞24-61-00∞∞∞∞∞∞∞∞∞∞Page 203 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 电源 3(156)
