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Unpowered). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.20.10
AC Standby Power System (Standby Power selector
- BAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.20.11
DC Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.20.12
Main DC Electrical System. . . . . . . . . . . . . . . . . . . . . . . . . . 6.20.12
Main DC Power Distribution. . . . . . . . . . . . . . . . . . . . . . . . . 6.20.12
Battery Busses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.20.12
Electrical Power SystemSchematic . . . . . . . . . . . . . . . . . . . . . . 6.20.14
EICASMessages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.30.1
Electrical EICASMessages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.30.1
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.TOC.0.2 D6-30151-425
Electrical -
Table of Contents
Intentionally
Blank
October 1, 2000
747 Operations Manual
Electrical Chapter 6
Controls and Indicators Section 10
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.10.1
Electrical Panel
1 Standby Power and Utility Bus Controls
2 External Power, APU Generator, and Battery Controls
3 AC Bus and Generator Controls
1
DRIVE
BUS
GEN
CONT
DRIVE
DISC
A
V
A
I
L
OFF
AUTO
BAT
STANDBY POWER
EXT PWR 1 APU GEN 1
L UTILITY R
BATTERY
ON
OFF
ISLN
AUTO
ON ON
DRIVE
BUS
ON
OFF
ISLN
AUTO
3
DRIVE
ON
OFF
ISLN
AUTO
4
DRIVE
ON
OFF
ISLN
AUTO
ON ON
BUS BUS
2
ON
OFF
ON
OFF
ON
OFF
OFF START
ON
APU
APU GEN 2 EXT PWR 2
BUS
TIE
A
V
A
I
L
A
V
A
I
L
A
V
A
I
L
OVERHEAD PANEL
2 2
1
3
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.10.2 D6-30151-425
Electrical -
Controls and Indicators
Standby Power, Battery, and Utility Bus Controls
1 STANDBY POWER Selector
Push to turn.
OFF –
• standby power not available
• main and APU standby busses disconnected from all power sources
AUTO – allows main and APU standby busses to be powered from available
sources.
BAT –
• powers main battery bus from main battery through the main hot battery
bus with battery switch ON
• powers APU battery bus from APU battery through the APU hot battery
bus with battery switch ON
• disables main and APU battery chargers
• powers main and APU standby busses from their related batteries through
their hot battery busses and standby inverters with Battery switch ON
Note: BAT position for ground maintenance use only.
A
V
A
I
L
OFF
AUTO
BAT
STANDBY POWER
EXT PWR 1 APU GEN 1
L UTILITY R
BATTERY
ON ON ON ON
ON
OFF
ON
OFF
ON
OFF
OFF START
ON
APU
APU GEN 2 EXT PWR 2
A
V
A
I
L
A
V
A
I
L
A
V
A
I
L
OVERHEAD PANEL
1
2
3
4
5
December 01, 1999
747 Operations Manual
Electrical -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.10.3
2 BATTERY Switch
ON -
• main battery available as backup power source for main battery bus and
main standby bus
• APU battery available as backup power source for APU battery bus and
APU standby bus
OFF - disconnects main and APU batteries from related battery busses.
3 BATTERY Switch OFF Light
Illuminated (amber) - Battery switch off.
4 UTILITY Power Switches
ON - each switch powers two utility ELCUs and two galley ELCUs.
OFF -
• removes power from related ELCUs
• resets fault logic circuitry
5 UTILITY Power OFF Lights
Illuminated (amber) -
• power removed from related ELCUs by fault protection logic, or
• related Utility Power switch OFF, or
• at least one Galley Emergency Power Off switch OFF
Note: Not illuminated during load shedding.
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