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ALL ú ú 01 Page 2 ú Dec 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
APU STATIC INVERTER
SEE C
E-8 RACK
SEEB
E-33 RACK (REF)
E-8 EQUIPMENT RACK
B
STATIC INVERTER (TYPICAL)
C
Static Inverter Location
Figure 1 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
5. Standby Power Transfer Relay (Fig. 2)
____________________________
A. The standby power transfer relay selects either the ac bus 3 or the output of the main static inverter to supply the ac standby bus. The relay is located in the P6 main power distribution panel.
6. Main Battery Relay (AMM 24-31-00/001) (Fig. 3)
__________________
A. The main battery relay connects the main battery hot bus voltage to the input of the main static inverter.
7. Battery Transfer Relay (AMM 24-31-00/001) (Fig. 3)
______________________
A. The battery transfer relay is used to connect dc bus 3 voltage to the input of the main static inverter.
8. APU Inverter Transfer Relay (Fig. 3)
___________________________
A. The APU inverter transfer relay is used to connect the APU hot battery bus voltage to the input of the APU static inverter when it is energized.
9. APU Standby Bus Transfer Relay (Fig. 3)
______________________________
A. The bus transfer relay selects either the ac voltage from the captain's transfer bus or the output of the APU static inverter and transfers it to the standby ac bus.
10. Towing - Power Transfer Relay (Fig. 3)
_____________________________
A. The towing-power transfer relay, when energized, connects the 24-volt dc main battery hot bus to the parking brake, service interphones, and to the input of the towing static inverter.
11. Towing - Lighting Transfer Relay (Fig. 3)
________________________________
A. The towing-lighting transfer relay selects the 115-volt ac ground service bus and the ac bus 3 or the 115-volt ac output of the towing static inverter to power the navigation lights and the main flood lights.
12. Towing/Battery Power Module
___________________________
A. The towing power switch enables the main battery hot bus voltage to be used for towing power.
B. The on battery light indicates the main battery hot bus voltage is being used for towing.
~.............................................................................. | RELAY | NOMENCLATURE | LOCATION | ................................................................................ | A | MAIN BAT RELAY | P180 | | A | BAT XFR RELAY | P180 | | A | APU INV XFR RELAY | P183 | | B | APU STBY BUS XFR RELAY | P6 | | A | TOWING-PWR XFR RELAY | P180 | | B | TOWING-LIGHTING XFR RELAY | P415 | 2.........….......................................................…............1
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú 10 Page 4 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE A
SEE B
P6 MAIN POWER DISTRIBUTION PANEL
A
STANDBY POWER TRANSFER RELAY
ELECTRICAL CONNECTOR RECEPTACLE
B
Standby Power Transfer Relay Location Figure 2
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