Electrical System Flashcards
What % NH starter becomes generator?
61.5%
Minimum Np for ACW
66%
How much DC power supplied by generator?
28V
How much power supplied by the two inverters?
26V
115V
ACW power voltage?
115V
200V
How much power does TRU give?
28V DC
What supplies TRU?
ACW BUS 2
What Np is ACW Gen MAINTAINED
70.8%
What supplies GRND Handling bus on ground no EXT PWR?
HOT MAIN BAT BUS
What supplies GRND Handling bus on ground with EXT PWR but not ON?
EXT PWR via DC SVCE BUS
UNDV light triggered when
19.5V
Pressing OVRD pb, DC and AC STBY BUS transferred from
HOT MAIN BAT BUS to HOT EMER BAT BUS
What happens when OVRD pb pressed in
DC STBY BUS recovered and UNDV extinguish
TRU supplies which busses?
DC EMER BUS
DC ESS BUS
DC&AC STBY BUS
X START FAIL means?
opposite gen did not come online to assist start at 10% NH
DC BUS 1 supplied by which DC GEN
DC GEN 1
Electrical power generation is powered by
- Main and emergency batteries
- Two engine-driven DC starter/generators
- Two AC wild frequency generators
- Two external power units (AC and DC).
the 28v DC can be provided by
- Two engines driven starter/generators
- One ground external power unit
Three sources can be used for the 28 VDC emergency supply:
- One main battery
- One emergency battery, excluding START function
- One TRU
Main BAT rating
24v NiCd bat 43 Ah
EMER BAT rating
24v NiCd bat 17 Ah
Bat monitoring perfomed by?
MFC
Starter generator driven by?
engine accessory gearbox
Starter mode, starter/gen is power by
Main bat
EXTPWR
Mainbat+operating generator(cross start)
EXTPWR takes precedence yes no
Yes
BPCU controls?
Bus Power Control Unit controls: BTC Bat Start Contactor, Load shedding, Extpwrfunctions, DC SVCE BUS contactors
11 DC BUSSES
DC BUS 1 DC BUS 2 HOTMAIN BAT BUS HOT EMER BAT BUS DC EMER DC ESS DC STBY UTLY BUS 1 UTLY BUS 2 DC SVCE GND HDLG
