Loss of the 601PP and 602PP Busbars in Ground Service Configuration

TASK 24-43-00-810-801-A
Loss of the 601PP and 602PP Busbars in Ground Service Configuration

1. Possible Causes

wiring
C/B-SVCE/601PP/602PP/SPLY [1PX]
CNTOR-DC SVCE BUS GND SPLY [3PX]
C/B-ELEC/DC SVCE/BUS/ON TR2 [5PX]
CNTOR-AC & DC GND SVCE SPLY [14XX]

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 24-42-00-861-001	Energize the Ground Service Network from the External Power
AMM 24-42-00-862-001	De-energize the Ground Service Network Supplied from the External Power
AMM 24-42-55-000-001	Removal of the Contactors
AMM 24-42-55-400-001	Installation of the Contactors
ASM 244301
AMM 24-43-55-000-001	Removal of the DC Service Bus Ground Supply Contactor

3. Fault Confirmation
Subtask 24-43-00-860-050-A

A. Job Set-up
(1) Energize the ground service network with the ground power unit AMM 24-42-00-861-001.

Subtask 24-43-00-710-050-A

B. Test

ACTION	RESULT
1.On the overhead panel 25VU, put the INT LT/DOME switch in the BRT position.	The CAPT dome lights do not come on.

4. Fault Isolation
Subtask 24-43-00-810-050-B ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

Do a check of the status of the circuit breaker (1PX).

(1) If the circuit breaker is closed:

Do a check for 28VDC on the pin 6 of the module 14PN ASM 244301.

(a) If there is no 28VDC:

Do a check of the wiring between the circuit breaker (1PX) and the pin 6 of the module 14PN ASM 244301.

1 If there is no continuity:

Repair the wiring .

2 If there is continuity:

Replace the C/B-SVCE/601PP/602PP/SPLY [1PX] .

(b) If there is 28VDC:

Replace the CNTOR-DC SVCE BUS GND SPLY [3PX] AMM 24-42-55-000-001 and AMM 24-42-55-400-001.

1 If the fault continues:

Do a check of the wiring between pin 7 of the module 14PN and the busbars 601PP and 602PP ASM 244301.

a If there is no continuity:

Repair the wiring .

b If there is continuity:

Do a check and repair the wiring :
. from the pin 6 of the module 14PN to the circuit breaker (5PX)
. from the circuit breaker (5PX) to the pin B/3 of the contactor (3PX)
. from the pin B/5 of the contactor (3PX) to the terminal block ASM 244301.

c If the fault continues:

Replace the C/B-ELEC/DC SVCE/BUS/ON TR2 [5PX] .

d If the fault continues:

Replace the CNTOR-AC & DC GND SVCE SPLY [14XX] AMM 24-42-55-000-001 and AMM 24-42-55-000-001.

(2) If the circuit breaker is open:

Do the procedure (Ref. TSM TASK 24-00-00-810-803).

(a) If the fault continues:

Replace the C/B-SVCE/601PP/602PP/SPLY [1PX] .

Subtask 24-43-00-810-050-C ** ON A/C NOT FOR ALL