ELEC Panel Flashcards
What is the minimum battery voltage?
25.6V
What would a pilot do if BAT voltage is 25.5 or below on originating preflight?
Charge the batteries with external power by selecting BAT pushbuttons to AUTO
How long should the batteries be charged?
20 minutes, then recheck the voltage
Explain how to conduct the BAT check. What if it fails the test?
• Select ELEC on ECAM • TurnBAT1&2OFFthenON • 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
Describe the electrical power system.
• 2x 28V Batteries • 2x IDGs • APU GEN • 2x AC Buses (AC1 and AC2), AC ESS BUS (normally powered by AC BUS 1) • 2x TRUs • Backed-up by a RAT to supply emergency electrical power ————————————– • The electrical power system consists of a three-phase 115/200-volt 400- hertz constant frequency AC system and a 28-volt DC • Normally, the system produces alternating current, some of which is then transformed into direct current for certain applications. • Each of the aircraft’s three generators can supply the whole 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.
If all AC power is lost, what happens?
DC power from the batteries is converted into AC.
What would be an expected indication in the GEN pushbuttons prior to engine start?
FAULT indication.
Define and describe an IDG.
• Integrated Drive Generator • Takes variable engine output and gives a constant output.
How would a pilot disconnect an IDG?
Lift the red guard and push the IDG pushbutton, being careful not to hold the pushbutton for longer than three seconds.
How would an IDG be reconnected?
This cannot be done by the flight crew – it is a maintenance function.
Describe the function of the BUS TIE in AUTO.
• Allows a single source of power to power AC BUS 1 & 2 • Allows connection of the APU GEN or EXT power to system • Inhibits multiple sources connected simultaneously
If GEN 1 fails to supply AC BUS 1, what happens?
Gen 2 (or APU GEN if available) powers the system through the bus tie.
How is the AC ESS BUS normally powered?
From AC BUS 1
If AC BUS 1 fails, how is the AC ESS bus powered?
AC bus 2 automatically feeds the AC ESS bus.
What indication will be present on the ELEC panel that AC BUS 2 is feeding the AC ESS bus?
- There is no indication if the transfer was done automatically.
- If manually selected, the AC ESS FEED ALTN light will illuminate.