FALCON 7X
02-24-10
CODDE 1
PAGE 7
/ 8
DGT97831
ATA 24 – ELECTRICAL POWER
DESCRIPTION
ISSUE 2
DASSAULT AVIATION Proprietary Data
SECONDARY POWER DISTRIBUTION BOX (SPDB)
Each of the SPDB performs similar functions. The main difference is the location in the
airplane, and the variation in the number of connections to the airplane wiring. The four
SPDB:
-
Receive electrical power inputs from LH and RH PPDB,
-
Distribute electrical power to Equipments loads via feeder cables,
-
Ensure protection of cables and monitor the status of supply to the different airplane
equipment.
Each SPDB contains:
-
Power supply,
-
Circuit breakers,
-
Electronic CB (SSPC) for the rear SPDB.
BATTERY BUSES
The battery buses are powered as soon as the dedicated battery is installed and plugged in.
Regardless of battery switch position, the battery bus provides electrical power directly to:
-
The Ground Service Bus (GSB),
-
The refueling system,
-
The engine FIRE extinguishers secondary discharge,
-
The fuel shut-off valves,
-
The access door lighting.
GROUND SERVICE BUS
The Ground Service Bus powers a limited number of RH ESS bus equipment without the
need to power up the entire electrical distribution.
The Ground Service Bus is accessible via the maintenance panel.
The Ground Service Bus operation is limited to 3 minutes by a circuit timer.
NOTE
With ambient temperatures below 0°c do not operate the Ground Service Bus (Battery Load).
POWER DISTRIBUTION CONTROL UNIT (PDCU)
Each Primary Power Distribution Box (PPDB) is controlled through a Primary Distribution
Control Unit (PDCU) that manages:
-
Batteries, buses ties, load shed cabin, galley, GCU contactors,
-
In accordance with load shedding and fault isolation logic.
The load shedding is controlled by the two PDCU by opening contactors when electrical
power sources can not supply all airplane loads.
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Refer to "System Protections" section for these load-shedding logics.