P6 PANEL
A
P414 PANEL B
AC Electrical Load Distribution - Component Location Figure 102 (Sheet 1)
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A
747-400
FAULT ISOLATION/MAINT MANUAL
GALLEY POWER 1 GROUND HANDLING
ELCU, M481 UTILITY POWER 1 RELAY 1, R117
ELCU, M3250 GROUND HANDLING
RELAY 2, R118
GROUND SERVICE
SELECT RELAY, R14
GROUND SERVICE BUS
P514 UTILITY SELECT
RELAY, R1168
GROUND SERVICE BUS
UTILITY TRANSFER
RELAY, R1169
P614
GROUND SERVICE
TRANSFER RELAY, R15
GALLEY POWER 2 ELCU, M482
UTILITY POWER 2 SEE J ELCU, M3251
P514 AND P614 PANELS
C
P714 PANEL
D
UTILITY POWER 3 ELCU, M3252 GALLEY POWER 3 ELCU, M485
P515 MAIN DECK CARGO HANDLING BUS RELAY 2 (R992)
MAIN DECK CARGO HANDLING BUS RELAY 1 (R991)
UTILITY POWER 4 ELCU, M3253
GALLEY POWERP615
4 ELCU, M486
P515 AND P615 PANELS
E P715 AUX/EXT NO. 2 POWER CENTER
F
AC Electrical Load Distribution - Component Location (Details from Sht 1) Figure 102 (Sheet 2)
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A
747-400 MAINTENANCE MANUAL
AC ELECTRICAL LOAD DISTRIBUTION - ADJUSTMENT/TEST
_________________________________________________
1. General_______
A. This procedure has one task to do an operational test of the ac electrical-load-distribution system. The operational test includes a test of the utility power ELCUs and the galley power ELCUs.
TASK 24-50-00-715-001
2. Operational Test - AC Electrical Load Distribution (Fig. 501)__________________________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
WDM 24-51-11 thru 24-51-73, 24-53-21 thru 24-53-62
(3)
SSM 24-51-01 thru 24-51-08, 24-53-01 thru 24-53-02
B.
Access
(1)
Location Zone
221 Control Cabin, LH
C.
Procedure
S 865-002
(1)
Supply electrical power (Ref 24-22-00/201).
S 715-010
(2)
Do a test of the indicator lights for the electrical system:
(a)
Set the IND LTS switch, on the P5 panel, to TEST.
(b)
Make sure all the indicator lights for the electrical system on the P5 panel and the P461 panel come on.
(c)
Set the IND LTS switch to BRT.
S 865-006
(3)
Make sure the BUS TIE 1, 2, 3, and 4 switches, on the P5 panel, are set to AUTO.
(a)
Make sure the ISLN lights on the BUS TIE switches are off.
S 865-007
(4)
Make sure the OFF lights on the UTILITY switches, on the P5 panel, are off.
(a)
If the OFF light(s) are on, push the applicable UTILITY switch.
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