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With the battery switch offand no GPU hooked up, these buses are powered.
When any of the followingdoors are opened, the GroundHandling Bus is energized through the Battery Transfer Relay.
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
Hot Main Battery
Hot Emergency Battery
1. Cargo Door Access Panel2. Refueling Panel3. Main Cabin Door4. Auxiliary Hydraulic Pump
Push Button is depressed.
BTR
If you walk into the cockpit and observe a GREEN AVAILlight on the main electrical panel, these buses are now powered.
AVAIL
SHED
SHED
EXT PWR DC GEN 2DC GEN 1
AC BUS 2
INV 1 INV 2
01
2
1
2DC
CHDCH
ESS BUS
DC SVCE/UTLY BUS
BAT SEL
MAINEMERG BTC
STBY BUS
EMER BUS
DC BUS 2
OFF
ON
OVRD
BAT
MAIN BATCHG
EMER BATCHG
DC BUS 1
AC BUS 1
EXTERNALPOWER
EGHR
When the GPU is plugged in, theExternal Ground Handling Relaycloses taking priority over the BusTransfer Relay. The BTR then opens.
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
Hot Main Battery
Hot Emergency Battery
BTR
DC SVCEBUS
If the DC SERVICE BUS pushbutton is depressed on theflight attendant panel, thenthe DC SERVICE BUS is powered through the Service Bus Transfer Relay.
ON
GND SVCE BUS
PASS LAV CAPT LAV CARGOEMER
LT
CALLS SMOKE
GALLEY LAV
LAT
PASS DIM
UPR
PASS ENTR
AFT
CARGO
READ
LT VENT
ACDC
The GPU is now poweringthe Ground Handling Bus and the DC Service Bus.
EXTERNALPOWER
EGHR
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
Hot Main Battery
Hot Emergency Battery
BTR
SBTR
Now we turn on the Main Battery Toggle Switch.
AVAIL
SHED
SHED
EXT PWR DC GEN 2DC GEN 1
AC BUS 2
INV 1 INV 2
01
2
1
2DC
CHDCH
ESS BUS
DC SVCE/UTLY BUS
BAT SEL
MAINEMERG BTC
STBY BUS
EMER BUS
DC BUS 2
OFF
ON
OVRD
BAT
MAIN BATCHG
EMER BATCHG
DC BUS 1
AC BUS 1
DC SVCEBUS
EXTERNALPOWER
EGHR
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
Hot Main Battery
Hot Emergency Battery
BTR
SBTR
Now we turn on the Main Battery Toggle Switch.
AVAIL
SHED
SHED
EXT PWR DC GEN 2DC GEN 1
AC BUS 2
INV 1 INV 2
01
2
1
2DC
CHDCH
ESS BUS
DC SVCE/UTLY BUS
BAT SEL
MAINEMERG BTC
STBY BUS
EMER BUS
DC BUS 2
OFF
ON
OVRD
BAT
MAIN BATCHG
EMER BATCHG
DC BUS 1
AC BUS 1
DC SVCEBUS
EXTERNALPOWER
EGHR
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
Hot Main Battery
Hot Emergency Battery
BTR
SBTR
Now we turn on the Main Battery Toggle Switch.
AVAIL
SHED
SHED
EXT PWR DC GEN 2DC GEN 1
AC BUS 2
INV 1 INV 2
01
2
1
2DC
CHDCH
ESS BUS
DC SVCE/UTLY BUS
BAT SEL
MAINEMERG BTC
STBY BUS
EMER BUS
DC BUS 2
OFF
ON
OVRD
BAT
MAIN BATCHG
EMER BATCHG
DC BUS 1
AC BUS 1
DC SVCEBUS
EXTERNALPOWER
EGHR
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
Hot Main Battery
Hot Emergency Battery
BTR
SBTR
Now with the main batteryon, these buses are powered.
FAULTFAULT AVAIL
SHED
SHED
DC GEN 2DC GEN 1
01
2
1
2DC
CHDCH
DC SVCE/UTLY BUS
BAT SEL
MAINEMERG BTC
DC BUSOFF
DC BUSOFF
BUSOFF
INVFAULT
BUSOFF
EXT PWR
EMER BATCHG
EMER BUS ESS BUS
STBY BUS
AC BUS 2AC BUS 1
INV 1
DC BUS 1
OFF
ON
OVRD
BAT
MAIN BATCHG
INV 2
DC BUS 2
DC EMER BUS
DC STBY BUS
DC ESS BUS
HMBTCHEBTC
SBTC
HBTC
INV 1
DC SVCEBUS
EXTERNALPOWER
EGHR
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
Hot Main Battery
Hot Emergency Battery
BTR
SBTR
HEBTC = Hot Emergency Bus Transfer Contactor
HMBTC = Hot Main Bus Transfer Contactor
SBTC = Standby Bus Transfer Contactor
HBTC = Hot Battery Transfer Contactor
115 VAC SBY
26 VAC SBY
When the external power pushbutton is depressed, these buses are powered.
FAULTFAULT AVAIL
SHED
SHED
DC GEN 2DC GEN 1
01
2
1
2DC
CHDCH
DC SVCE/UTLY BUS
BAT SEL
MAINEMERG BTC
DC BUSOFF
DC BUSOFF
BUSOFF
INVFAULT
BUSOFF
EXT PWR
EMER BATCHG
EMER BUS ESS BUS
STBY BUS
AC BUS 2AC BUS 1
INV 1
DC BUS 1
OFF
ON
OVRD
BAT
MAIN BATCHG
INV 2
DC BUS 2
DC EMER BUS
DC STBY BUS
DC ESS BUS
HMBTCHEBTC
SBTC
HBTC
INV 1
DC SVCEBUS
EXTERNALPOWER
EGHR
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
Hot Main Battery
Hot Emergency Battery
BTR
SBTR
115 VAC SBY
26 VAC SBY
SDTC
When the external power pushbutton is depressed, these buses are powered.
FAULTFAULT AVAIL
SHED
SHED
DC GEN 2DC GEN 1
01
2
1
2DC
CHDCH
DC SVCE/UTLY BUS
BAT SEL
MAINEMERG BTC
DC BUSOFF
DC BUSOFF
BUSOFF
INVFAULT
BUSOFF
EXT PWR
EMER BATCHG
EMER BUS ESS BUS
STBY BUS
AC BUS 2AC BUS 1
INV 1
DC BUS 1
OFF
ON
OVRD
BAT
MAIN BATCHG
INV 2
DC BUS 2
ON
UTILITYBUS 2
UTILITYBUS 1
DC BUS 1 DC BUS 2
DC EMER BUS
DC STBY BUS
DC ESS BUS
HMBTCHEBTC
SBTC
HBTC
INV 1
DC SVCEBUS
EXTERNALPOWER
EGHR
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
BTR
SBTR
115 VAC SBY
26 VAC SBY
115 VAC BUS 2
26 VAC BUS 2
115 VAC BUS 1
26 VAC BUS 1
INV 2
ACBTR
ASTR
#1 INVERTER FAIL SIGNAL
INVERTER FAIL SIGNAL
SDTC
When DC Bus 1 is powered the Static Inverter Override Transfer Contactor (SDTC) closes and the HBTC (Hot Bat Transfer Contactor opens).
FAULTFAULT AVAIL
SHED
SHED
DC GEN 2DC GEN 1
01
2
1
2DC
CHDCH
DC SVCE/UTLY BUS
BAT SEL
MAINEMERG BTC
EXT PWR
EMER BATCHG
EMER BUS ESS BUS
STBY BUS
AC BUS 2AC BUS 1
INV 1
DC BUS 1
OFF
ON
OVRD
BAT
MAIN BATCHG
INV 2
DC BUS 2
ON
UTILITYBUS 2
UTILITYBUS 1
DC BUS 1 DC BUS 2
DC EMER BUS
DC STBY BUS
DC ESS BUS
HMBTCHEBTC
SBTC
HBTC
INV 1
DC SVCEBUS
EXTERNALPOWER
EGHR
GND HDLGBUS
HOT EMERBAT BUS
+ -
HOT MAINBAT BUS
+ -
BTR
SBTR
115 VAC SBY
26 VAC SBY
115 VAC BUS 2
26 VAC BUS 2
115 VAC BUS 1
26 VAC BUS 1
INV 2
ACBTR
ASTR
#1 INVERTER FAIL SIGNAL
INVERTER FAIL SIGNAL
Once the DC Buses are powered, the associated lights are extinguished on the main electrical panel.