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LED display.
ELECTRICAL POWER - POWER AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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Page 8
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-00-00-001
ELECTRICAL POWER - POWER AND CONTROL - GENERAL DESCRIPTION
ELECTRICAL POWER - POWER AND CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 24-00-00
Page 9
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-00-00-001
General
These AC buses receive power directly from an AC power
source:
* AC transfer bus 1
* AC transfer bus 2
* Ground service bus 1
* Ground service bus 2.
System logic automatically removes loads (load shed) to
prevent an overload of an AC power source.
These DC buses receive power directly from the transformer
rectifier units (TRUs):
* DC bus 1
* DC bus 2
* Battery bus.
GUN 001-012, 016-099, 101-110, 115
These buses receive power directly from the battery or the
battery charger:
* Hot battery bus
* Switched hot battery bus.
GUN 013-015, 111-114, 201-999
These buses receive power directly from the main battery or the
main battery charger:
* Hot battery bus
* Switched hot battery bus.
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AC Transfer Buses
These AC sources supply power to the AC transfer buses:
* External power
* APU starter-generator
* Integrated drive generators (IDGs).
The system design makes sure that two AC power sources can
not supply power to the same transfer bus at the same time.
However, one AC power source can supply power to both
transfer buses through the bus tie breakers (BTBs).
Each transfer bus supplies power to these components or
buses:
* Galleys (as many as 2)
* Main Bus
* Ground service bus
* Transformer rectifier unit (as many as 2).
Ground Service Buses
Each ground service bus receives power in one of these two
ways:
* The AC transfer bus on that side has power
ELECTRICAL POWER - DISTRIBUTION - GENERAL DESCRIPTION
EFFECTIVITY
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Page 10
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
24-00-00-002
* The ground service switch on the forward attendant panel is
in the ON position and external power is connected to the
airplane.
The two ground service transfer relays control the selection of
the power source.
Main Buses and Galley Buses
The main buses and the galley buses receive power from their
respective AC transfer bus. Load shed relays remove the power
to these buses when their loads exceed operating limits. This
protects the AC power source from overload. The bus power
control unit (BPCU) controls the load shed function.
DC Buses
DC bus 1 usually receives power from TRU 1. However, the bus
can receive power from TRU 2 or TRU 3 through the bus tie
relay. This relay is usually energized.
DC bus 2 usually receive power from TRU 2. TRU 3 supplies
power if TRU 2 fails. DC bus 2 may also receive power from TRU
1 through the bus tie relay.
Standby Buses
The AC standby bus usually receives power from AC transfer
bus 1. The static inverter may also supply power to this bus. A
remote control circuit breaker (RCCB) controls power to the
static inverter.
The DC standby bus usually receives power from DC bus 1. The
hot battery bus may also supply power to the DC standby bus.
Battery Buses
GUN 001-012, 016-099, 101-110, 115
The hot battery bus receives power from the battery or battery
charger.
GUN 013-015, 111-114, 201-999
The hot battery bus usually receives power from the main
battery or main battery charger. The auxiliary battery and
auxiliary battery charger connects in parallel with the main
battery during non-normal conditions to help supply power. See
the DC Generation section for more information.
(SECTION 24-30)
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The battery bus normally receives power from TRU 3. The
battery bus receives power from the battery if TRU 3 has no
output.
The switched hot battery bus receives power from the hot
battery bus when the battery switch (P5 panel) is in the ON
position.
ELECTRICAL POWER - DISTRIBUTION - GENERAL DESCRIPTION
EFFECTIVITY
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Page 11
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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