R (a) If there is no continuity:
R - replace the GLC-APU (3XS) (Ref. AMM TASK 24-23-55-000-001) and
R (Ref. AMM TASK 24-23-55-400-001).
R (b) If there is continuity:
R - do a check of the wiring of the APU GLC control-circuit (Ref.
R ASM 24-23/02) for an open circuit between:
R . pin B/10J of the GAPCU and pin C/3 of the ELEC/APU GEN R pushbutton switch (2XS)
R . pin C/1 of the ELEC/APU GEN pushbutton switch and pin X/1 of R the APU GLC auxiliary control relay (4XS)
R . pin X/2 of the APU GLC auxiliary control relay and the ground
R . pin B/10J of the GAPCU and pin A/44 of the diode module R 1164VD
R . pin A/43 of the diode module 1164VD and pin A/D3 of the EPC R auxiliary control relay (5XG)
R . pin A/D2 of the EPC auxiliary control relay and pin B/10 of R the GLC 1
R . pin A/D2 of the EPC auxiliary control relay and pin B/8 of R the BTC 1
R . pin B/12 of the GLC 1, pin B/6 of the BTC 1, pin B/12 of the R GLC 2 and pin B/18 of the BTC 2
R . pin B/10 of the GLC 2 and pin A/C2 of the EPC auxiliary R control relay
R . pin B/20 of the BTC 2 and pin A/C2 of the EPC auxiliary R control relay
R . pin A/C3 of the EPC auxiliary control relay and pin A/B2 of R the APU GLC auxiliary control relay (4XS)
R . pin A/B1 of the APU GLC auxiliary control relay and pin B/24 R of the EPC (3XG)
R . pin B/22 of the EPC and pin B/3 of the APU GLC (3XS)
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R . pin B/5 of the APU GLC and ground.
R - do a check of the contacts of the contactors and relays of the
R APU GLC control circuit (Ref. ASM 24-23/02) for correct
R operation.
R 1_ If the wiring or the contacts do not operate correctly:
R - repair or replace the wiring as necessary
R - replace the RELAY-APU GLC AUX CTL (4XS) as necessary
R - replace the RELAY-EPC AUX CTL (5XG) as necessary
R - replace the GLC-1 (9XU1), the GLC-2 (9XU2), the BTC-1
R (11XU1) or the BTC-2 (11XU2) (Ref. AMM TASK 24-22-55-000-
R 001) and (Ref. AMM TASK 24-22-55-400-002) as necessary.
R 2_ If the wiring or the contacts operate correctly:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001)
R and (Ref. AMM TASK 24-41-34-400-001).
R C. Do the test given in para. 3.
R TASK 24-23-00-810-819
R Failure of the Neutral-To-Phase System of the APU Generator or the Neutral
R Feeder
R 1. Possible Causes_______________
R - GEN-APU (8XS)
R - wiring
R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------
R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R AMM 24-23-51-000-001
R AMM 24-23-51-400-001
R AMM 24-41-00-861-002
R
R AMM 24-41-00-862-002
R
R ASM 24-23/01
R 3. Fault Confirmation
__________________
R A. Test
R Not applicable.
Removal of the APU Generator 8XS Installation of the APU Generator 8XS Energize the Aircraft Electrical Circuits from the APU De-energize the Aircraft Electrical Circuits Supplied from the APU
R NOTE : As the APU GEN was set to OFF because of a true failure, the fault
____ R confirmation is not necessary.
R 4. Fault Isolation
_______________
R A. If the fault symptom is identified by the CFDS message WRG: FEEDER
R NEUTRAL/ GEN APU (8XS) and the upper ECAM-DU warning APU GEN FAULT:
R - do a check of the wiring of the APU generator neutral-feeder for an
R open circuit or a high resistance condition between the terminal N of
R the APU generator and the airframe ground (Ref. ASM 24-23/01).
R (1) If the wiring is not correct:
R - repair or replace the neutral feeder as necessary.
R (2) If the wiring is correct:
R - do a check of the resistance of the neutral-to-phase connections
R (Ref. ASM 24-23/01) of the APU generator between:
R . terminal T1 and N (9.35 milliohms plus or minus 1.25 milliohms)
R . terminal T2 and N (9.35 milliohms plus or minus 1.25 milliohms)
R . terminal T3 and N (9.35 milliohms plus or minus 1.25 milliohms). 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(20)
