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gnd & 30min in flt.
- On gnd (<50kt), when batteries only are supplying a/c.
- In flt DC generation lost (limited to 7 seconds)
Batteries connected to DC ESS BUS when batteries only are supplying:-
- in flight
- on gnd (<50kt) provided bat sel to AUTO.
Note: Batteries are normally disconnected
Auto cutoff logic prevents bat from completely discharging on gnd.
Logic - a/c on gnd
- main power off
- bat <23V for 16 sec or longer
OFF - BCL not operating & DC ESS BUS not connected to bat.
- HOT buses remain supplied
FAULT - Amber with ECAM when charging current abnormal. Bat contactor opens
APU BAT
Controls the operation of APU BCL
AUTO - APU BCL automatically controls closure/opening of line APU contactor.
Battery connected when:-
- charging as per bat 1(2)
- When APU start sequence initiated
OFF / FAULT Lt - As for Bat 1(2)
BAT
1
2
APU
Overhead Panel Switches
10-Aug-10 For reference only 8
AUT
O
AC ESS FEED
Normal - AC ESS BUS supplied by AC BUS 1.1 (AC BUS 1 - A330)
- Automatically supplied by AC BUS 2.4 (AC BUS 2 - A330) when AC
BUS 1.1(AC BUS 1 – A330) is lost.
ALTN - AC ESS BUS supplied by AC BUS 2.4 (AC BUS 2 - A330)
FAULT - Amber with ECAM when AC ESS BUS not electrically supplied.
Note 1: If main generators are lost AC ESS BUS auto supplied by EMERG GEN or by static
inverter if EMERG GEN not avail.
Note 2: The only procedure that asks for the use of this Pb is the SMOKE/AVNCS SMOKE c/l.
GALLEY
AUTO - ECMU (Electrical Contactor & Management Unit) auto controls
shedding of galleys if GEN failure or overload detected.
- On gnd APU gen or external pwr supplies galleys provided no
overload detected.
OFF - All galleys are shed and water/water ice protection lost.
FAULT Lt - Amber with ECAM if overload is detected and auto shedding is not performed.
Note: OFF then AUTO resets galleys that have been shed due overload. If lost due to loss of gen,
no reset.
COMMERCIAL
OFF - Following equipment is shed:
- galleys
- passenger entertain system (music & video)
- cargo loading system
- electrical service
- escape slide lock mechanism ice protection
- water/waste (drain mast) ice protection
- lav & cabin lights
- water heater
IDG 1 (2,3 or 4) (Integrated Drive Generator)
When pressed, IDG disconnects from drive shaft. Can only reconnect on gnd.
Caution: do not hold down for more than 3sec due damage to disconnection
mechanism.
Caution: IDG disconnect inhibited when engine N2 (N3 A330) is below the low
speed threshold.
FAULT Lt - Amber with ECAM :
- IDG oil outlet overheat (above 185˚C) or
- IDG oil press low. Inhibited if N2 <14% (N3 <52% A330)
- Light extinguishes when IDG disconnected.
Overhead Panel Switches
10-Aug-10 For reference only 9
AUTO
GEN 1 (2,3 or 4)
Each GEN can supply up to 75KVA 3 phase 115/200V 400 hertz power. (A330 up
to 115KVA per gen)
ON - Gen field is energized & line contactor closes.
OFF/R - Gen field is de-energized & line contactor opens, also resetting circuit.
FAULT Lt - Amber with ECAM if protection trip initiated by Generator Control Unit
(GCU).
- Line contactor opens.
Note: If protection trip initiated by a differential fault the reset action has no effect after 2 attempts.
APU GEN
Can supply up to 115KVA which is enough to power entire a/c.
ON - APU gen field is energized & contactor closes.
- Each bus tie contactor 1,2,3 and/or 4 auto close if associated gen not
operative.
OFF/R - Gen field de-energized & contactor opens, resetting circuit.
FAULT Lt - Same as GEN 1 FAULT. APU GEN FAULT Lt inhibited when APU slow
BUS TIE
AUTO (A340) - The 5 BUS TIE contactors auto open/close according to
priority logic to power all AC buses.
- When gen is lost its BUS TIE contactor and the adjacent gen’s BUS TIE
contactor close ensuring supply to AC BUS.
- All 5 contactors close when only APU gen or 1 gnd pwr unit.
- when only 2 gens on same side supplying pwr, following contactors
close:
- the 2 contactors associated to both lost gens
- the contactor associated to the external running gen
- the 5th contactor (located between the left & right side)
AUTO (A330) - the 3 BUST TIE contactors open/close to provide power to all AC buses. All 3 are
closed when a/c is supplied by only one eng generator or by only APU or single gnd pwr unit.
OFF - All BUS TIE contactors open.
Note A340: Cycling BUS TIE pb on gnd inhibits NBPT function. The function may be recovered
by switching OFF all a/c elec sources and resetting GPCU.
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