Electrical Flashcards
Location of the APU battery?
Aft equipment bay
Max engine generator load?
40 KVA
Max APU generator load?
40 KVA
Max transformer rectifier unit (TRU) load?
120 AMPS
Max permissible time for ground operations with battery power only?
5 minutes
What is the reason for the Max ground operation time with battery power only?
To prevent ED1 and ED2 from overheating (fans are AC powered)
How many TRU’s are installed in the CRJ900
4
Where are the TRU’s located?
Nose compartment
The main battery is rated for?
17 amps / 24 volts
APU battery is rated to?
43 amps / 24 volts
How many generators are installed?
4
2 IDGS, 1 APU, 1 ADG
What is the function of the TRU’s
To convert 115 volt AC to 28 volt DC
How are the TRU’s cooled?
Individual fans
Which buses are powered when the battery master switch is selected on?
Main battery direct bus
APU battery direct bus
DC battery bus
If the main buses are powered, are the essential buses automatically powered?
Yes
Is there an on/off switch for the TRU’s
No. They are automatically powered when the AC buses are powered on.
What controls the DC tie contactors?
The DC Power Centers (DCPC) automatically control DC tie operation.
When will the Air Driven Generator (ADG) automatically deploy?
With complete loss of all AC power.
With the ADG deployed, what are the basic items that are powered?
AC ESS bus
Hydraulic pump 3B
Flaps/slaps
STAB trim CH 2
What is the ADG max load?
15 KVA
Location of the main battery?
Nose compartment
