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voltage level.
Battery Load
Displays the load on
the battery.
Battery Voltage
Displays the battery
voltage level.
Flow Lines
Green -- Energized.
Blank -- Not energized.
EICAS DIGITAL
READOUT GREEN WHITE AMBER DASHES
xx V (TRU) Between 22 and 29 volts Less than 22 volts or
more than 29 volts Invalid data
xx A (TRU) Less than 3.7 amps or Invalid data
more than 120.7 amps
xx V (BATT) Less than 18 volts or
more than 32 volts Invalid data
xx A (BATT) Invalid data
Between 18 and 32 volts
Between 3.7 and 120.7 amps
Less than 1.7 amps
and less than 12 volts
Not less than 1.7 amps or
not less than 12 volts
BATT
EICAS
OUTLINE GREEN AMBER WHITE HALF INTENSITY
MAGENTA
Invalid data
Invalid data
Not less than 3.7 amps
and
not less than 18 volts
BUS Bus powered Bus not powered _ Invalid data
TRU Less than 3.7 amps
and less than 18 volts
Not less than 18 volts Less than 18 volts
DIR BUS Not less than 18 volts Less than 18 volts _ Invalid data
_
_
V
A
V
A
DC ELECTRICAL
TRU 1
28
AC
BUS 1
AC
BUS 2
AC
BUS 2
AC
ESS BUS
APU BATT
DIR BUS
MAIN
BATT
MAIN BATT
DIR BUS
CROSS
TIE
V
18 A
TRU 2
28 V
18 A
ESS
28 V
10 A
ESS
28 V
20 A
TRU 2 TRU 1
BUS 1
BUS 2
SERV BUS
UTIL BUS
MAIN TIE
APU
BATT
24
0
24
0
ESS TIE
ESS BUS
BATT BUS
BRT
Vol. 1 07--30--6
ELECTRICAL
DC Electrical System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
DC Electrical Page Service Configuration
Figure 07---30---4
DC Emergency Bus and
Flow Lines
Displayed only when the
emergency bus is not
powered by both the
battery bus and the APU
battery direct bus.
DC Electrical Page
Alternate AC Essential
Flow Lines
Displayed only when AC
bus 2 is not available.
CHARGER (white)
Indicates that the
corresponding charger
is not charging.
BATT OFF (amber)
Indicates that the
corresponding battery
is not available.
SERVICE
CONFIGURATION
(amber)
Indicates that the
DC SERVICE has
been selected on.
DC Electrical Page
V
A
V
A
DC ELECTRICAL
TRU 1
0
AC
BUS 1
AC
BUS 2
AC
BUS 2
AC
ESS BUS
APU BATT
DIR BUS
MAIN
BATT
MAIN BATT
DIR BUS
CROSS
TIE
V
0 A
TRU 2
0 V
0 A
ESS
0 V
0 A
ESS
0 V
0 A
TRU 2 TRU 1
BUS 1
BUS 2
SERV BUS
UTIL BUS
MAIN TIE
APU
BATT
24
10
24
0
SERVICE CONFIGURATION
ESS TIE
ESS BUS
BATT BUS
BRT
BATT OFF
BATT OFF
V
A
V
A
DC ELECTRICAL
TRU 1
28
AC
BUS 1
AC
BUS 2
AC
ESS BUS
APU BATT
DIR BUS
MAIN
BATT
CHARGER MAIN BATT
DIR BUS
V
18 A
TRU 2
0 V
0 A
ESS
28 V
10 A
ESS
28 V
20 A
TRU 2 TRU 1
BUS 1
BUS 2
SERV BUS
UTIL BUS
MAIN TIE
APU
BATT
CHARGER 00
00
ESS TIE
ESS BUS
BATT BUS
CROSS
TIE
EMER BUS
BRT
Vol. 1 07--30--7
ELECTRICAL
DC Electrical System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
EICAS Primary Display Auxiliary Power Unit / Main Battery off <1001>
Figure 07---30---5
APU or MAIN BATT CHGR status (white)
Indicates that the corresponding battery is
overheating or not charging.
APU or MAIN BATT OFF caution (amber)
Indicates that APU or main battery is not
available.
DC BUS 1 or 2 caution (amber)
Indicates that the corresponding DC bus is
not powered with either AC bus 1 or 2 on line.
DC EMER BUS caution (amber)
Indicates that emergency bus is not powered.
DC ESS BUS caution (amber)
Indicates that essential bus is not powered in flight
or essential bus is not powered on the ground with
either AC essential bus or APU generator on line.
DC SERV BUS caution (amber)
Indicates that service bus is not powered with
either DC bus 2 powered or DC SERVICE
selected on and APU voltage >18 volts.
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