R A. If the fault symptom is identified by the CFDS message IDG2
R (E2-4000XU)/GCU2 (1XU2)/WRG: POR and the upper ECAM-DU warning GEN 2
R FAULT:
R - do an electrical resistance test of the IDG 2 exciter field between
R pins A/9 and A/10 (8.4 ohms plus or minus 0.84 ohms) (Ref. ASM 24-R 22/01).

R (1) If the resistance values are out of the specified limits:
R - replace the engine 2 IDG (4000XU) (Ref. AMM TASK 24-21-51-000-040)
R and (Ref. AMM TASK 24-21-51-400-040).

R (2) If the resistance values are in the specified limits:
R - do an electrical resistance test of the IDG 2 PMG stator (Ref. ASM
R 24-22/01) between:

R . pins B/12 and B/13 (1 ohm plus or minus 0.05 ohm)

R . pins B/12 and B/14 (1 ohm plus or minus 0.05 ohm)

R . pins B/13 and B/14 (1 ohm plus or minus 0.05 ohm).

R (a) If the resistance values are out of the specified limits:
R - replace the engine 2 IDG (4000XU) (Ref. AMM TASK 24-21-51-000-R 040) and (Ref. AMM TASK 24-21-51-400-040).

R (b) If the resistance values are in the specified limits:
R - do a check of the wiring of the PMG and exciter field (Ref. ASM
R 24-22/01) for a short to ground, a short circuit or an open
R circuit between:

R . pin B/12 of the IDG 2 and pin C/10 of the GCU 2

R . pin B/13 of the IDG 2 and pin C/11 of the GCU 2

R . pin B/14 of the IDG 2 and pin C/9 of the GCU 2

R . pins C/10, C/11, C/9 and C/7 of the GCU 2 (short to shield of R the PMG wiring)

R . pin A/9 of the IDG 2 and pin C/12 of the GCU 2

R . pin A/10 of the IDG 2 and pin C/13 of the GCU 2

R . pins C/12, C/13 and pin C/7 of the GCU 2 (short to shield of R the exciter field).

R 1_ If the wiring is not correct:
R - repair or replace as necessary.

R 2_ If the wiring is correct:
R - do a check of the Point-Of-Regulation sense wiring (Ref. ASM
R 24-22/01) for a short to ground, a short circuit or an open
R circuit between:

R . pin D of the GLC 2 and pin A/15G of the GCU 2

R . pin E of the GLC 2 and pin A/15H of the GCU 2

R . pin F of the GLC 2 and pin A/14G of the GCU 2

R . pin A/14H and ground.

R a_ If the wiring is not correct:
R - repair or replace as necessary.

 「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 : 401-499, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page B234
 Aug 01/05 CES

R  b If the wiring is correct:_ 
R  - do a check of the IDG 2 feeders for a phase-neutral 
R  reversal condition (Ref. ASM 24-22/01). 
R  * If there is a reversal: 
R  - remove and correctly install the generator feeders. 
R  * If the feeders are correctly installed: 
R  - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-
R  001) and (Ref. AMM TASK 24-22-34-400-001). 
R  ** If the fault continues: 
R  -- replace the engine 2 IDG (4000XU) (Ref. AMM TASK 24-
R  21-51-000-040) and (Ref. AMM TASK 24-21-51-400-040). 
R  B. Do this operational test to make sure that the system operates correctly. 
R  (1) Aircraft Maintenance Configuration 
R  (a) Energize the aircraft electrical circuits 
R  (Ref. AMM TASK 24-41-00-861-002). 
R  (b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) 
R  (Ref. AMM TASK 31-60-00-860-001). 
R  (2) On the ELEC panel 35VU: 
R  - push, release and push again the GEN 2 pushbutton switch (3XU2). 
R  (3) Do the operational test of the GAPCU (Ref. AMM TASK 24-41-00-740-
R  002). 
R  (4) Start the engine 2 (Ref. AMM TASK 71-00-00-710-003). 
R  (5) Do this test: 
R  -------------------------------------------------------------------------------
R  ACTION RESULT 
R  -------------------------------------------------------------------------------
R  On the ECAM control panel: On the lower ECAM DU: 
R  - get the ELEC page. - the correct electrical parameters of 
R  the GEN 2 are shown and the AC2 
R  busbar is supplied by the GEN 2. 
R  5. Close-up________ 
R  A. Put the aircraft back to its initial configuration. 
R  (1) Stop the engine 2 (Ref. AMM TASK 71-00-00-710-028). 
　
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