DC Power

Question 1

What is the purpose of the main battery?

Answer 1

To provide power to the starter generator for engine starting and to support essential busbars.

Question 2

Where is the main battery located?

Answer 2

In the rear of the cabin.

Question 3

What is contained within the Power Distribution Unit (PDU)?

Answer 3

All direct current contactors associated with DC generation and engine starting with exception of those specifically for batteries.

Question 4

At which temperature is the battery hot caption triggered?

Answer 4

71 degrees.

Question 5

What does the GCU look after during starting?

Answer 5

Field weakening
Cross start current limit
Start contactor control.

Question 6

If the voltage on the essential services busbar is less than 10V what caption would you get?

Answer 6

ESSBUS#

Question 7

At what Ng will Starter gen operate as a Generator?

Answer 7

50% Ng

Question 8

What is the purpose of the overvoltage sensing relay?

Answer 8

It inhibits the connection of external power if its volume exceeds a nominal 32.5V