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Electrical system sample
- 1. With the battery switch off and no GPU hooked up, these buses are powered. When any of the following doors are opened, the Ground Handling Bus is energized through the Battery Transfer Relay. GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT BUS + - Hot Main Battery Hot Emergency Battery 1. Cargo Door Access Panel 2. Refueling Panel 3. Main Cabin Door 4. Auxiliary Hydraulic Pump Push Button is depressed. BTR
- 2. If you walk into the cockpit and observe a GREEN AVAIL light 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 0 1 2 1 2 DC CHDCH ESS BUS DC SVCE/UTLY BUS BAT SEL MAINEMERG BTC STBY BUS EMER BUS DC BUS 2 OFF ON OVRD BAT MAIN BAT CHG EMER BAT CHG DC BUS 1 AC BUS 1 EXTERNAL POWER EGHR When the GPU is plugged in, the External Ground Handling Relay closes taking priority over the Bus Transfer Relay. The BTR then opens. GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT BUS + - Hot Main Battery Hot Emergency Battery BTR
- 3. DC SVCE BUS If the DC SERVICE BUS push button is depressed on the flight attendant panel, then the DC SERVICE BUS is powered through the Service Bus Transfer Relay. ON GND SVCE BUS PASS LAV CAPT LAV CARGO EMER LT CALLS SMOKE GALLEY LAV LAT PASS DIM UPR PASS ENTR AFT CARGO READ LT VENT ACDC The GPU is now powering the Ground Handling Bus and the DC Service Bus. EXTERNAL POWER EGHR GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT BUS + - Hot Main Battery Hot Emergency Battery BTR SBTR
- 4. 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 0 1 2 1 2 DC CHDCH ESS BUS DC SVCE/UTLY BUS BAT SEL MAINEMERG BTC STBY BUS EMER BUS DC BUS 2 OFF ON OVRD BAT MAIN BAT CHG EMER BAT CHG DC BUS 1 AC BUS 1 DC SVCE BUS EXTERNAL POWER EGHR GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT BUS + - Hot Main Battery Hot Emergency Battery BTR SBTR
- 5. 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 0 1 2 1 2 DC CHDCH ESS BUS DC SVCE/UTLY BUS BAT SEL MAINEMERG BTC STBY BUS EMER BUS DC BUS 2 OFF ON OVRD BAT MAIN BAT CHG EMER BAT CHG DC BUS 1 AC BUS 1 DC SVCE BUS EXTERNAL POWER EGHR GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT BUS + - Hot Main Battery Hot Emergency Battery BTR SBTR
- 6. 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 0 1 2 1 2 DC CHDCH ESS BUS DC SVCE/UTLY BUS BAT SEL MAINEMERG BTC STBY BUS EMER BUS DC BUS 2 OFF ON OVRD BAT MAIN BAT CHG EMER BAT CHG DC BUS 1 AC BUS 1 DC SVCE BUS EXTERNAL POWER EGHR GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT BUS + - Hot Main Battery Hot Emergency Battery BTR SBTR
- 7. Now with the main battery on, these buses are powered. FAULTFAULT AVAIL SHED SHED DC GEN 2DC GEN 1 0 1 2 1 2 DC CHDCH DC SVCE/UTLY BUS BAT SEL MAINEMERG BTC DC BUS OFF DC BUS OFF BUS OFF INV FAULT BUS OFF EXT PWR EMER BAT CHG EMER BUS ESS BUS STBY BUS AC BUS 2AC BUS 1 INV 1 DC BUS 1 OFF ON OVRD BAT MAIN BAT CHG INV 2 DC BUS 2 DC EMER BUS DC STBY BUS DC ESS BUS HMBTCHEBTC SBTC HBTC INV 1 DC SVCE BUS EXTERNAL POWER EGHR GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT 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
- 8. When the external power pushbutton is depressed, these buses are powered. FAULTFAULT AVAIL SHED SHED DC GEN 2DC GEN 1 0 1 2 1 2 DC CHDCH DC SVCE/UTLY BUS BAT SEL MAINEMERG BTC DC BUS OFF DC BUS OFF BUS OFF INV FAULT BUS OFF EXT PWR EMER BAT CHG EMER BUS ESS BUS STBY BUS AC BUS 2AC BUS 1 INV 1 DC BUS 1 OFF ON OVRD BAT MAIN BAT CHG INV 2 DC BUS 2 DC EMER BUS DC STBY BUS DC ESS BUS HMBTCHEBTC SBTC HBTC INV 1 DC SVCE BUS EXTERNAL POWER EGHR GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT BUS + - Hot Main Battery Hot Emergency Battery BTR SBTR 115 VAC SBY 26 VAC SBY
- 9. SDTC When the external power pushbutton is depressed, these buses are powered. FAULTFAULT AVAIL SHED SHED DC GEN 2DC GEN 1 0 1 2 1 2 DC CHDCH DC SVCE/UTLY BUS BAT SEL MAINEMERG BTC DC BUS OFF DC BUS OFF BUS OFF INV FAULT BUS OFF EXT PWR EMER BAT CHG EMER BUS ESS BUS STBY BUS AC BUS 2AC BUS 1 INV 1 DC BUS 1 OFF ON OVRD BAT MAIN BAT CHG INV 2 DC BUS 2 ON UTILITY BUS 2 UTILITY BUS 1 DC BUS 1 DC BUS 2 DC EMER BUS DC STBY BUS DC ESS BUS HMBTCHEBTC SBTC HBTC INV 1 DC SVCE BUS EXTERNAL POWER EGHR GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT 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
- 10. 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 0 1 2 1 2 DC CHDCH DC SVCE/UTLY BUS BAT SEL MAINEMERG BTC EXT PWR EMER BAT CHG EMER BUS ESS BUS STBY BUS AC BUS 2AC BUS 1 INV 1 DC BUS 1 OFF ON OVRD BAT MAIN BAT CHG INV 2 DC BUS 2 ON UTILITY BUS 2 UTILITY BUS 1 DC BUS 1 DC BUS 2 DC EMER BUS DC STBY BUS DC ESS BUS HMBTCHEBTC SBTC HBTC INV 1 DC SVCE BUS EXTERNAL POWER EGHR GND HDLG BUS HOT EMER BAT BUS + - HOT MAIN BAT 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.