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STANDBY
MAIN BAT BUS
INVERTER
APU BAT BUS
GRND SERVICE BUS
APU HOT BAT BUS MAIN HOT BAT BUS
APU STBY BUS MAIN STBY BUS
CHARGER
MAIN MAIN BAT
BATTERY
APU
BATTERY
APU BAT
CHARGER
CAPT TRANSFER BUS
DC BUS 3
AC BUS 1 AC BUS 3
TRU 3
Conditions
1. Battery Switch - ON
2. Standby Power Selector -AUTO
Powered (AC)
Unpowered
Powered (DC)
3. All busses powered normally
December 01, 1999
747 Operations Manual
Electrical -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.20.9
AC Standby Power System (AC Bus 3 Unpowered)
INVERTER
STANDBY
APU
APU BAT BUS MAIN BAT BUS
GRND SERVICE BUS
APU HOT BAT BUS MAIN HOT BAT BUS
APU STBY BUS MAIN STBY BUS
CHARGER
MAIN MAIN BAT
BATTERY
APU
BATTERY
APU BAT
CHARGER
CAPT TRANSFER BUS
DC BUS 3
AC BUS 1 AC BUS 3
TRU 3
MAIN
STANDBY
INVERTER
Conditions
1. Battery Switch - ON
2. Standby Power Selector -AUTO
Powered (AC)
Unpowered
Powered (DC)
3. AC Bus 3 - unpowered
4. Standby power available without limitation
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.20.10 D6-30151-425
Electrical -
System Description
AC Standby Power System (AC Busses 1 and 3 Unpowered)
INVERTER
STANDBY
APU
MAIN BAT BUS
GRND SERVICE BUS
APU HOT BAT BUS MAIN HOT BAT BUS
APU STBY BUS MAIN STBY BUS
MAIN
BATTERY
APU
BATTERY
CAPT TRANSFER BUS
DC BUS 3
AC BUS 1 AC BUS 3
TRU 3
MAIN
STANDBY
INVERTER
APU BAT BUS
CHARGER
APU BAT MAIN BAT
CHARGER
Conditions
1. Battery Switch - ON
2. Standby Power Selector - AUTO
Powered (AC)
Unpowered
Powered (DC)
3. AC Busses 1 and 3 - unpowered
4. Standby power available minimum 30 minutes
December 01, 1999
747 Operations Manual
Electrical -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.20.11
AC Standby Power System (Standby Power selector - BAT)
INVERTER
STANDBY
APU
APU BAT BUS MAIN BAT BUS
GRND SERVICE BUS
APU HOT BAT BUS MAIN HOT BAT BUS
APU STBY BUS MAIN STBY BUS
CHARGER
MAIN MAIN BAT
BATTERY
APU
BATTERY
APU BAT
CHARGER
CAPT TRANSFER BUS
DC BUS 3
AC BUS 1 AC BUS 3
TRU 3
MAIN
STANDBY
INVERTER
Conditions
1. Battery Switch - ON
2. Standby Power Selector -BAT
Powered (AC)
Unpowered
Powered (DC)
3. Battery chargers disabled
4. Battery power available minimum 30 minutes
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.20.12 D6-30151-425
Electrical -
System Description
DC Electrical System
The DC electrical system includes the main DC electrical system and the battery
busses.
Main DC Electrical System
The main DC electrical system uses four transformer-rectifier units (TRUs) to
produce DC power. Each TRU is powered by its related AC bus and provides DC
power to a DC bus. The four DC busses are connected through DC isolation relays
(DCIRs) to the DC tie bus. This allows each DC bus to remain powered if its
related AC bus is unpowered or TRU fails. Pushing the Bus Tie switch to AUTO
closes the related BTB and DCIR. Pushing the Bus Tie switch OFF opens the BTB
and DCIR. This isolates the DC bus from the DC tie bus, leaving it powered by its
AC bus and TRU. Automatic isolation of an AC bus due to an electrical fault opens
the BTB, but does not open the DC isolation relay.
Main DC Power Distribution
TRU DC electrical power is distributed to four main DC busses. Main DC busses
power individual equipment items such as:
• cabin pressure, fuel jettison, and pack temperature controllers
• wing anti-ice control
• engine-driven and hydraulic demand pump control
• fuel transfer and jettison valve control
(SB changes ZK-SUI ; modification to maintain normal system operation
upon loss of APU battery bus power installed)
• individual nacelle anti-ice control
Battery Busses
The following battery busses distribute DC power in addition to the four main DC
busses:
• Main battery bus
• APU battery bus
• Main hot battery bus
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