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Effectivity:
S Aircraft 7221 and subsequent
NOTE
In flight, both chargers will be shed during single
generator operations. On the ground, both chargers are
shed if external AC power is connected, the flaps are out
of the 0 detent, and the passenger and service doors are
closed.
Vol. 1 07--30--3
REV 56, Jan 31/03
ELECTRICAL
DC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
DC Distribution System
Figure 07---30---1
REV 56, Jan 31/03
Vol. 1 07--30--4
ELECTRICAL
DC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
DC Electrical System
Figure 07---30---2
DC SERVICE
Used to connect the DC
service bus to the APU
battery direct bus.
Electrical Power Panel
Overhead Panel
Essential Bus Tie
Switch/Light
CLOSED -- When
pressed in, comes
on white to indicate
that ESS Bus has
been manually tied
to the service TRU
during a DC
essential TRU failure.
BUS TIE 1 or 2
Switch/Lights
CLOSED -- Come on
white to indicate that
the corresponding DC
bus has been
automatically tied to
the service TRU during
an abnormal
condition, or has been
pressed in, to manually
tie corresponding bus
to the service TRU.
CLOSED light (white)
comes on.
Corresponding utility
bus is shed when
switch/light indicates
CLOSED.
ESS TIE switch/light
can only be selected
manually.
BATTERY MASTER
Used to connect the APU
and main battery direct
busses to the battery bus.
NOTE
Battery master should
always be in the ON
position in flight.
Vol. 1 07--30--5
REV 56, Jan 31/03
ELECTRICAL
DC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
C. External DC Power
The aircraft can be connected to 28 volts DC from an external receptacle located on the
right aft fuselage below No. 2 engine. External DC is used for ground operations to
save battery power and can be used to start the APU. When external DC is connected
to the aircraft, an external DC contactor is energized to provide power to the APU start
contactor. At the same time, the AVAIL lamp in the DC switchlight illuminates. Pressing
the switchlight closes two contactors to connect the external DC to the Main and APU
battery direct buses and the IN USE lamp in the switchlight illuminates.
D. DC Distribution
DC power is distributed to the DC system by five TRU’s. DC bus 1 and DC Utility bus 1
are powered from TRU 1. DC bus 2 and DC Utility bus 2 are powered from TRU 2.
The DC essential bus and battery buses are normally powered from the essential
TRUs. The emergency bus is powered from the battery bus and the APU battery direct
bus. The service TRU powers the DC service bus. In the event that an essential TRU
fails, the DC essential bus and battery bus will remain powered from the operating
essential TRU. If both essential TRU’s fail, the essential DC bus and battery bus may
still be powered from the service TRU by selecting the ESS TIE switchlight on the
electrical panel. In the event that a main TRU fails, the respective DC tie will close to
maintain power to the respective DC bus 1/2 from the service TRU. At the same time
the corresponding utility bus will be SHED.
The Main battery direct bus, APU battery direct bus, and the emergency bus are all hot
buses (they are continuously powered at all times from the batteries). When the
BATTERY MASTER switch is selected ON, an input signal is supplied to the two power
controllers (PC). The power controllers monitor for AC power, and if AC power is not
available then the controllers will connect their respective batteries to the battery bus.
When AC power is available, for the TRU’s to power the DC system, the power
controllers will disconnect the batteries from the battery bus. Each battery direct bus
can power the DC battery bus. Both the battery bus and the APU battery direct bus
power the DC emergency bus. The DC service bus is normally powered from the
service TRU. If the DC SERVICE switch on the electrical panel is selected ON, the DC
service bus will be powered from the APU battery direct bus.
NOTE
Although there is only one battery bus, it is split
between circuit breaker panel 1 and 2 and is referred
to as the left and right battery bus.
In flight, if the power controllers sense a complete loss of AC power, they will reconnect
the batteries to the battery bus and at the same time the DC emergency ties will close
to connect the battery bus to the DC essential bus. Once the ADG bus is online to
　
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