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 Energizing the single TRU relay causes the battery transfer relay to de-energize, which removes dc bus 3 from the main and APU battery buses and causes the battery chargers to enter the TRU mode if 115 volt ac 3 phase power is on the ground service bus.

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 The APU battery bus transfer relay energizes during APU start, transferring the APU battery bus to the main hot battery bus.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
DC GENERATION
COMPONENT  SHT 102 FIG.  QTY  ACCESS/AREA  REFERENCE AMM 
BATTERY - APU, M7432  3  1  835L, AFT EQUIP CTR, RACK E33  24-31-06 
BATTERY - MAIN, M7423  2  1  117AL, MAIN EQUIP CTR, BAT RACK  24-31-01 
CHARGER - APU BATTERY, M7431  3  1  835L, AFT EQUIP CTR, RACK E33  24-31-07 
CHARGER - MAIN BATTERY, M7422  1  1  117AL, MAIN EQUIP CTR, RACK E30  24-31-02 
CIRCUIT BREAKER - 1  FLT COMPT, P6 
APU BAT BUS APU BAT CONT, C10343  1  6J9  * 
APU BAT BUS TRU-CONT, C10342  1  6J8  * 
DC BUS-CONT 1, C10152  1  6K6  * 
DC BUS-CONT 2, C10153  1  6K7  * 
DC BUS-CONT 3, C10154  1  6K8  * 
DC BUS-CONT 4, C10155  1  6K9  * 
MN AC STBY BUS VOLTAGE, C10366  1  6J1  * 
MN BAT-CONT INVERTER PWR, C8848  1  6K2  * 
MN BAT-CONT MN BAT BUS, C8849  1  6K3  * 
MN BAT HOT BUS P6-CONT, C8851  1  6K1  * 
MN BAT OVHT PROT, C8829  1  6G9  * 
MN BAT RELAY CONT, C8850  1  6J7  * 
P7 MN BAT DIST, C1062  1  6A6  * 
TRU 1, C806  1  6A5  * 
TRU 2, C807  1  6A14  * 
TRU 3, C870  1  6A23  * 
TRU 4, C871  1  6A32  * 
CIRCUIT BREAKER - 1  117AL, MAIN EQUIP CTR, P180 
APU BAT MAIN BAT, C10341  1  180K7  * 
APU BAT DIST P180, C10363  1  180K4  * 
APU BATT VOLT, C8834  1  180L10  * 
APU TRU CONT, C10546  1  180K9  * 
MAIN BAT CHARGER OUTPUT, C8830  1  180L3  * 
MAIN BAT DIST P180, C10362  1  180K2  * 
MAIN BAT VOLT, C8831  1  180M10  * 
TRU 1 VOLTAGE, C10253  1  180J13  * 
TRU 2 VOLTAGE, C10254  1  180F13  * 
TRU 3 VOLTAGE, C10255  1  180J28  * 
TRU 4 VOLTAGE, C10256  1  180F28  * 
CIRCUIT BREAKER - 3  835L, AFT EQUIP CTR, P183 
APU BATTERY BUS, C1740  1  * 
APU BATTERY CHGR, C805  1  * 
APU BATTERY CHGR OUTPUT, C8833  1  * 
APU BATTERY OVHT PROT, C8832  1  * 
APU CRANK VOLTAGE, C10536  1  * 
APU TRU POWER SENSE, C10548  1  * 
APU TRU START, C1620  1  * 
CIRCUIT BREAKER - 1  117AL, MAIN EQUIP CTR, P414 
MAIN BATTERY CHARGER, C854  1  414P18  * 
CIRCUIT BREAKER - 1  117AL, MAIN EQUIP CTR, P415 
MAIN DECK CARGO HDLG TRU, C1573  1  * 
CIRCUIT BREAKER - 1  117AL, MAIN EQUIP CTR, P715 
CARGO LOADS & LTG SEC 2, C1611  1  * 
P116 MAIN DECK CARGO HNDLG BUS, C1567  1  * 
P118 & P136 MAIN DECK CGO HNDLG BUS, C1570  1  * 
P124 MAIN DECK CGO HNDLG BUS, C1568  1  * 
SIDE CARGO DOOR PWR, C1635  1  * 

* SEE THE WDM EQUIPMENT LIST
DC Generation - Component Index Figure 101 (Sheet 1)
M49671
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