W DOC AIRBUS | TSM A320F

Result of the EMER GEN Test Incorrect (Loss of the AC ESS Busbar)

TASK 24-24-00-810-805-A
Result of the EMER GEN Test Incorrect (Loss of the AC ESS Busbar)

1. Possible Causes
  • CNTOR-AC ESS BUS SWITCHING [15XE]
  • wiring
  • TIMER [33XE]
  • C/B-AC ESS BUS/EMER/CNTOR/CTL [5XE]
  • C/B-AC ESS/BUS/EMER/CNTOR/SPLY [15PC]
  • GLC-EMER [2XE]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 24-00-00-810-803-A
Circuit Breaker Tripped and/or C/B TRIPPED Warning
AMM 24-24-00-710-001
Operational Test of the Emergency Generation System
ASM 242402
AMM 24-24-55-000-001
Removal of the Emergency Generator Line Contactor (EMER GLC)
AMM 24-24-55-000-002
Removal of the AC ESS BUS Contactor
AMM 24-24-55-400-001
Installation of the Emergency Generator Line Contactor (EMER GLC)
AMM 24-24-55-400-002
Installation of the AC ESS BUS Contactor
ASM 243501
3. Fault Confirmation
Subtask 24-24-00-710-058-A
A. Test
Do the operational test of the emergency generation system AMM 24-24-00-710-001.
   (1) If during the test:
on the upper ECAM display unit:
  • the ELEC AC ESS BUS FAULT warning comes into view
on the lower ECAM display unit:
  • the ESS TR voltage is 28VDC
  • the line between the EMER GEN and ESS TR boxes comes on green.
do the trouble shooting given in Para. 4.B.
   (2) If during the test:
on the upper ECAM display unit:
  • the ELEC AC ESS BUS FAULT warning comes into view
on the lower ECAM display unit:
  • the ESS TR voltage is 0VDC
  • the EMER GEN voltage and frequency are correct
  • the line between the EMER GEN and ESS TR boxes goes off
  • the line between the EMER GEN and the AC ESS bus goes off
do the trouble shooting given in Para. 4.C.
4. Fault Isolation
Subtask 24-24-00-865-051-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
106VUAC ESS BUS/EMER/CNTOR/CTL5XEB07
106VUAC ESS/BUS/EMER/CNTOR/SPLY15PCC08
Subtask 24-24-00-810-054-B
B. If the test confirms the fault:
  • Do a check of the status of the circuit breakers (5XE) and (15PC).
   (1) If these circuit breakers are closed:
     (a) If the fault continues:
  • Do a check of the wiring between respectively:
    . the pins L3 and B/K of the AC ESS BUS SWITCHING contactor (15XE)
    . the pin K1 of the contactor (15XE) and the pins A/B then B/B of the AC ESS BUS switching contactor (3XC) through the DC ESS BUS supply contactor (4PC) and the relay (17PC)
    . the pin B/D of the contactor (3XC) and the pin A/A3 of the timer (33XE)
    . the pin A/D of the contactor (3XC) and the pin A/A3 of the timer (33XE)
    . the pin K1 of the contactor (15XE) and the pin A3 of the relay (17PC), through the TR1 and TR2 contactors (5PU1) and (5PU2)
    . the pin B/K of the contactor (15XE) and the pin A/C3 of the timer (33XE)
    . the pin B/L of the contactor (15XE) and the ground, through the timer (33XE) ASM 242402 and ASM 243501.
  • If the wiring is correct:
    . Replace the TIMER [33XE] .
   (2) If the circuit breaker (5XE) is open:
     (a) If the fault continues:
  • Replace the C/B-AC ESS BUS/EMER/CNTOR/CTL [5XE] .
   (3) If the circuit breaker (15PC) is open:
     (a) If the fault continues:
  • Replace the C/B-AC ESS/BUS/EMER/CNTOR/SPLY [15PC] .
Subtask 24-24-00-810-055-A
C. If the test confirms the fault:
   (1) If the fault continues:
  • do a check and repair the wiring between the pin A/X of the CSM/G control unit (1XE) and the pin X of the EMER GLC (2XE) then between the pin Z of the EMER GLC (2XE) and the ground ASM 242402.
Subtask 24-24-00-710-059-A
D. Do the operational test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:39:03 UTC
"AVIABRAIN" 2025