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• APUhotbatterybus
The main and APU battery busses are normally powered by DC bus 3. If DC bus
3 is unpowered, each bus is powered, with the Battery Switch on, by its related hot
battery bus.
The main battery bus provides power to individual equipment such as:
• APU controller (alternate), fuel valves (all engines), all crossfeed valves
• dome, storm, and selected indicator lights
April 01, 2001
747 Operations Manual
Electrical -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.20.13
• IDG disconnect (all engines), manual pressurization control, trailing edge
flap control
(SB changes ZK-SUI ; modification to maintain normal system operation
upon loss of APU battery bus power installed)
• Captain’s interphone, left radio tuning panel, left VHF
The APU battery bus powers individual equipment items such as:
• APU DC fuel pump, engine start air control
• Cargo, First Officer’s, and service interphones, PA system
• APU fire warning horn, APU and engine fire detectors A and B
(SB changes ZK-SUI ; before SB, modification to maintain normal system
operation upon loss of APU battery bus power not installed)
• Captain’s interphone, left radio tuning panel, left VHF, nacelle anti-ice
control (all engines)
Each hot battery bus is normally powered by the ground service bus through its
related battery charger, which acts as a TRU for the hot battery bus while
simultaneously maintaining its related battery fully charged. Each battery is
directly connected to its related hot battery bus.
With the Battery switch ON, the main and APU hot battery busses power their
related battery busses if DC bus 3 is unpowered.
The main hot battery bus powers individual equipment items such as:
• APU fuel shutoff valve, spar valves (all engines)
• APU and lower cargo fire extinguishers
• engine fire extinguishers (all engines), fire switch unlock (all engines)
The APU hot battery bus powers individual equipment items such as:
• IRU left, center, right DC power
• left and right outflow valves
• APU inlet door, APU controller (primary), and APU fire warning horn
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.20.14 D6-30151-425
Electrical -
System Description
Electrical Power System Schematic
INVERTER
STANDBY
APU
AC BUS 1 POWERED
DC BUS 3
T
R
T
R R
T
R
T
MAIN
STANDBY
MAIN BAT BUS
INVERTER
DC BUS 1 DC BUS 2 APU BAT BUS DC BUS 4
AC BUS 2 POWERED
F/O TRANSFER BUS
AC BUS 1 AC BUS 2 AC BUS 3 AC BUS 4
L I A V A
APU GEN 1
AUTO
2
OFF
ON
DRIVE
EXT PWR 1
AUTO
OFF
ON
1
DRIVE
APU GEN 2
ON
AUTO
OFF
ON
DRIVE
3
EXT PWR 2
AUTO
ON
OFF
DRIVE
4
CAPT TRANSFER BUS
DISC
DRIVE
CONT
GEN
TIE
BUS
GND SERVICE BUS
APU HOT BAT BUS MAIN HOT BAT BUS
ON
ON
BATTERY
GND HANDLING BUS
EXT PWR 1 APU GEN 1
MAIN STBY BUS
AC BUS 3 POWERED
APU STBY BUS
BATTERY SW
DC ISOLATION
RELAY (4)
(FLIGHT ATTENDANT'S PANEL)
GND SERVICE SW
CHARGER
MAIN MAIN BAT
BATTERY
APU
BATTERY
APU BAT
CHARGER
Condition: No
electrical system
faults.
ELECTRICAL POWER SYSTEM DIAGRAM
December 01, 1999
747 Operations Manual
Electrical Chapter 6
EICAS Messages Section 30
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.30.1
Electrical EICAS Messages
The following EICAS messages can be displayed.
Message Level Aural Condition
>BAT DISCH APU Advisory APU battery discharging.
>BAT DISCH MAIN Advisory Main battery discharging.
>BATTERY OFF Advisory Battery switch OFF.
>DRIVE DISC 1, 2, 3, 4 Advisory Generator Drive
Disconnect switch
pushed, IDG manually
disconnected.
ELEC AC BUS 1, 2, 3, 4 Caution Beeper AC bus unpowered.
Additional related
messages displayed for
unpowered equipment
items.
ELEC BUS ISLN 1, 2, 3, 4 Advisory Bus tie breaker open.
Inhibited when ELEC AC
BUS message displayed.
Message Level Aural Condition
ELEC DRIVE 1, 2, 3, 4 Advisory IDG oil pressure low or
oil temperature high.
Inhibited when IDG
manually disconnected.
　
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