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Volume 2 Flight Crew Operating Manual Rev 11, Apr 17, 2006
ELECTRICAL
DC BUS FEED SYSTEM
Each DC bus is normally powered by its respective TRU. Each TRU is normally powered by its own AC BUS FEEDER (ESS TRU 2 is powered by AC ESS BUS). In the event of a TRU malfunction, the priority system will automatically provide an alternate TRU feed to power the respective DC bus. As soon as one TRU fails, the emergency tie contactor (ETC) closes to allow power distribution.
ESS TRU 2 will be powered (through the AC ESS BUS) when the RAT is deployed and RAT GEN is selected ON.
The DC buses are powered by the TRUs in the following descending order:
.
DC BUS 1 . TRU 1, ESS TRU 1.
.
DC ESS BUS . ESS TRU 1, ESS TRU 2, TRU 2, TRU 1.
.
BATT BUS . ESS TRU 2, ESS TRU 1, TRU 2, TRU 1.
.
DC BUS 2 . TRU 2, ESS TRU 2.
DC BUS 1 and DC BUS 2 are automatically load shed when a single generator is powering the buses.
External DC power will power the APU BATT DIR BUS and consequently, the BATT BUS and the DC EMER BUS. External DC power is normally used by maintenance personnel or to start the APU in the event of a low APU BATT voltage.
The DC bus feed is displayed on the DC ELECTRICAL synoptic page as follows:
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
ELECTRICAL
DC BUS FEED SYSTEM (CONT'D)
. Normally powered by TRU 1, alternately powered by the following, in descending
order:
TRU 1
ESS TRU 1
GF0710_043
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
07.10.30 CSP 700.5000.6
ELECTRICAL
DC BUS FEED SYSTEM (CONT'D)
. Normally powered by ESS TRU 1, alternately powered by the following, in descending order:
ESS TRU 1
ESS TRU 2
TRU 2
TRU 1
GF0710_045
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
CSP 700.5000.6 07.10.31
ELECTRICAL
DC BUS FEED SYSTEM (CONT'D)
. Normally powered by ESS TRU 2, alternately powered by the following, in descending order:
ESS TRU 2
TRU 2
ESS TRU 1
TRU 1
Batteries
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
07.10.32 CSP 700.5000.6
ELECTRICAL
DC BUS FEED SYSTEM (CONT'D)
. Normally powered by TRU 2, alternately powered by the following, in descending
order:
TRU 2
ESS TRU 2
GF0710_049a
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
CSP 700.5000.6 07.10.33
ELECTRICAL
DC BUS FEED SYSTEM (CONT'D)
External DC Power
Indicates that external DC power is connected (not on.line) and is within limits.
ON Light
Indicates external DC power is powering APU BATT DIR BUS.
GF0710_050a
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
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