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Main Battery
Voltage Readout
APU Battery
Voltage Readout
EXT DC IN USE
Main Battery
Load Readout
APU Battery
Load Readout
MAIN Battery Outline
Battery voltage is equal to or greater than 18 VDC
Battery voltage is less than 18 VDC
Invalid data
BATT OFF Main battery is less than 18 VDC
BATT OFF
CHGR FAIL
CHGR FAIL Main battery is not charging or Main charger has failed
APU battery is less than 18 VDC
APU battery is not charging or APU charger has failed
MAIN
BATT
MAIN
BATT
MAIN
BATT
V
V
V
A
A
A
MAIN
BATT
26 V
0 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
APU BATT
DIR BUS
MAIN
BATT
MAIN
BATT
15 V 24 V
7 A 0 A
APU
BATT
APU
BATT
BATT OFF BATT OFF CHGR FAIL CHGR FAIL
17 V 24 V
9 A 0 A
26
15
- -
0
7
- -
APU Battery Outline
Battery voltage is equal to or greater than 18 VDC and EXT
DC is not in use
Battery voltage is less than 18 VDC and EXT DC is not in use
EXT DC is in use
Note: APU BATT voltage and amperage go blank
Invalid data
APU
BATT
APU
BATT
APU
BATT
APU
BATT
V
V
V
A
A
A
27
17
- -
0
9
- -
ELECTRICAL
For Training Purposes Only
May 03
7-47
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - Battery Power Distribution System (2 of 2)
Figure 7-39
P604_07_052
Description Symbol Condition
MAIN and APU Battery
Voltage Readouts
MAIN and APU Battery
Load Readouts
Voltage is between 18 and 32 VDC
Voltage is less than 18 VDC or greater than 32 VDC
Invalid data
Battery is equal or greater than 12 VDC or load is greater
than 0 amps
Battery is less than 12 VDC and load is 0 amps
Invalid data
26
10
- -
8
0
- -
V
V
V
A
A
A
EXT DC Outline
EXT DC voltage is less than 18 VDC
EXT DC voltage is equal or greater than 18 VDC
EXT
DC
V
A
EXT
DC
V
A
28
16
19
5
ELECTRICAL
7-48 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - DC Electrical Power Distribution (1 of 2)
Figure 7-40
DC ELECTRICAL
TRU 1
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
EMER BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
AC BUS 1 AC BUS 2 AC ESS BUS
TIE
ESS BUS
BATT BUS
28 V
8 A
TRU 2
28 V
13 A
ESS
TRU 2
28 V
24 A
ESS
TRU 1
28 V
24 A
MAIN
BATT
26 V
0 A
APU
BATT
27 V
0 A
EXT
DC
28 V
19 A
P604_07_053
Description Symbol Condition
Bus Input
Flow Lines
DC BUS 1, 2
Bus Bar Outline
Bus powered
Bus not powered
Invalid data
UTIL BUS 1, 2
Bus Bar Outline
BUS 1
BUS 1
BUS 1
BUS 2
BUS 2
BUS 2
Bus powered
Bus not powered
Invalid data
UTIL BUS 1
UTIL BUS 1
UTIL BUS 1
UTIL BUS 2
UTIL BUS 2
UTIL BUS 2
BUS 1
BUS 2
UTIL BUS 1
UTIL BUS 2
TIE
MAIN BUS TIE CLOSED
Bus Input
Flow Lines
Respective TRU/battery is on-line and output is 18 VDC
or greater
Respective TRU/battery is on-line and output is less than
18 VDC or no supply is being provided to respective bus
ELECTRICAL
For Training Purposes Only
May 03
7-49
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - DC Electrical Power Distribution (2 of 2)
Figure 7-41
Description Symbol Condition
P604_07_054
APU BATT
DIR BUS
Bus Bar Outline
Battery voltage is greater than 18 VDC, BATT MASTER
switch ON, and EXT DC not in use
Battery voltage is less than 18 VDC, BATT MASTER
switch ON, and EXT DC not in use
APU BATT
DIR BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
Bus Bar Outline
Invalid data
Battery voltage is greater than 18 VDC and BATT MASTER
switch ON
Battery voltage is less than 18 VDC and BATT MASTER
switch ON
Invalid data
MAIN BATT
DIR BUS
MAIN BATT
DIR BUS
MAIN BATT
DIR BUS
APU BATT
　
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