ELEC Panel (Rev. 3)

Question 1

What is the minimum battery voltage?

Answer 1

25.6V

Question 2

What would a pilot do if BAT voltage is 25.5 or below on originating preflight?

Answer 2

Charge the batteries with external power by selecting BAT pbs to AUTO

Question 3

How long should the batteries be charged?

Answer 3

20 minutes, then recheck the voltage

Question 4

How is the BAT check conducted? What if it fails the test?

Answer 4

• Select ELEC on ECAM
• Turn BAT 1 & 2 OFF then ON
• Check BAT charge current is < 60 amps and decreasing within 10 seconds
• If it fails the test, wait until the end of the charging cycle and repeat the test

Question 5

Describe the electrical power system

Answer 5

• The electrical power system consists of a three-phase 115/200 volt 400 hz constant frequency AC system and a 28 volt DC
• Normally, the system produces AC current, some of which is then transformed into DC current for certain applications
• Each of the A/Cs 3 generators can supply the entire network
• If all normal AC generation is lost, an emergency generator can supply AC power
• If all AC generation is lost, the system can transform DC power from the batteries into AC power

Question 6

If all AC power is lost, what happens?

Answer 6

DC power from the batteries is converted into AC power

Question 7

What would be an expected indication in the GEN pbs prior to engine start?

Answer 7

FAULT indication

Question 8

Define and describe an IDG

Answer 8

• Integrated drive generator

- Takes variable engine output and gives constant AC electrical output

Question 9

How would a pilot disconnect an IDG?

Answer 9

Lift the red guard and push the IDG pb, being careful not to hold the pb longer than 3 seconds

Question 10

How would and IDG be reconnected?

Answer 10

• This cannot be done by the flight crew.

- MX action is required

Question 11

Describe the function of the BUS TIE in AUTO

Answer 11

• Allows a single source to power AC BUS 1 and 2
• Allows connection of the APU GEN or EXT power to system
• Inhibits multiple sources connected simultaneously

Question 12

If GEN 1 fails to supply AC BUS 1, what happens?

Answer 12

Gen 2 (or APU GEN if available) powers the system through the bus tie

Question 13

How is the AC ESS bus normally powered?

Answer 13

From AC BUS 1

Question 14

If AC BUS 1 fails, how is the AC ESS BUS powered?

Answer 14

AC BUS 2 automatically feeds the AC ESS BUS

Question 15

What indication will be present on the ELEC panel that AC BUS 2 is feeding the AC ESS BUS?

Answer 15

AC ESS FEED ALTN light illuminated only if the switch is manually selected

Question 16

What does a GALLEY fault light indicate?

Answer 16

At least one generator load is above 100% rated output

Question 17

Explain the AUTO function of the GALLEY pb

Answer 17

Sheds main galley if only 1 GEN is available

Question 18

How is the BATTERY BUS normally powered?

Answer 18

DC BUS 1 through the DC tie contactor

Question 19

What buses are powered by the EMER GEN?

Answer 19

• AC ESS BUS
• AC ESS SHED
• DC ESS BUS by the ESS TR
• DC ESS SHED

Question 20

What dies a BAT FAULT light indicate?

Answer 20

• Battery charging current outside limits

- BAT contactor opens

Question 21

When are the batteries connected to the battery bus?

Answer 21

• APU start
• Battery charging
• AC BUS 1 & 2 not powered and airspeed below 100 kts