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until fixed.
ELECTRICAL
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
07−10−26
DC SYSTEM EICAS MESSAGES (CONT'D)
EXT DC PWR AVAIL
Indicates that external
DC power is available.
APU (AV) BATT CHGR FAIL
Indicates that affected battery
charger has detected a fault
and has shut down.
TRU 1−2 FAIL
ESS TRU 1−2 FAIL
Indicates that affected
TRU has failed.
EXT DC PWR ON
Indicates that external
DC power has been
selected on.
BATT BUS MAN OFF
DC BUS 1 (2) MAN OFF
DC ESS BUS MAN OFF
Indicates that affected DC
bus has been manually
isolated. DC essential
cannot be manually isolated
if battery has been isolated
and vice versa.
BATT EMER PWR ON
Indicates that the batteries
are feeding the DC ESS
BUS and BATT busses in
an emergency condition.
ELEC SYS FAULT
(on ground only)
Indicates that a minor
fault has been detected
in the electrical system.
CB TRIP
Indicates that a circuit
breaker has tripped.
GF0710_036a APU BATT CHGR FAIL
AV BATT CHGR FAIL
BATT EMER PWR ON
CB TRIP
ELEC SYS FAULT
EXT DC PWR AVAIL
ESS TRU 1 FAIL
ESS TRU 2 FAIL
TRU 1 FAIL
TRU 2 FAIL
BATT BUS MAN OFF
DC BUS 1 MAN OFF
DC BUS 2 MAN OFF
DC ESS BUS MAN OFF
EXT DC PWR ON
CAIMS Level C fault.
Fault must be fixed
within 10 days.
ELECTRICAL
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
07−10−27
DC SYSTEM SYNOPTIC
EICAS Control Panel
GF0710_039
AC BUS 2
FEEDER
DC BUS 1
V
A
28
35
TRU 1
AC BUS 3
FEEDER
DC BUS 2
V
A
28
35
TRU 2
AC BUS 1
FEEDER
AC ESS
BUS
DC ESS
V
A
28
35
ESS
TRU 1
V
A
28
35
ESS
TRU 1
BUS
DC EMER
BATT BUS
BUS
AV BATT
DIR BUS
V
A
26
0
−10°C
AV
BATT
V
A
24
0
APU BATT
DIR BUS
20 °C
APU
BATT
DC ELECTRICAL
EICAS
SCROLL SYSTEM SELECT
The DC electrical page contains digital readouts of TRU and battery output (voltage and ampere
output), input/output flow on the bus bars, general status information via color logic and the following
messages:
· CHARGER message (adjacent to APU BATT symbol) − APU battery is not charging.
Corresponds to APU BATT CHGR FAIL advisory message .
· CHARGER message (adjacent to AV BATT symbol) − Main airplane battery is not charging.
AV BATT CHGR FAIL advisory message displayed on EICAS.
· SHED message − Corresponding DC bus has been shed.
· MAN OFF message − Corresponding DC bus is isolated. DC BUS 1, 2, MAN OFF, DC ESS
MAN OFF and/or BATT BUS MAN OFF status message displayed on EICAS.
DC BUS 1
MAN OFF
DC BUS 2
SHED
−10
AV
BATT
APU
BATT
C 20 C
CHARGER CHARGER
GF0710_041
APU BATT CHGR FAIL
AV BATT CHGR FAIL
DC BUS 1 MAN OFF
DC BUS 2 MAN OFF
DC ESS MAN OFF
BATT BUS MAN OFF
ELECTRICAL
Flight Crew Operating Manual Rev 11, Apr 17, 2006
CSP 700−5000−6
Volume 2
07−10−28
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.
　
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