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lost.
ALTN – AC ESS BUS supplied by AC BUS 2.4 (2 A330)
FAULT - Amber with ECAM when AC ESS BUS not electrically supplied.
Note: If main generators are lost AC ESS BUS auto supplied by EMERG GEN or by static
inverter if EMERG GEN not avail.
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
23-Jan-07 For reference only
AU
T
O
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.
EXT A (Momentary Action pb)
AVAIL Lt – Green if all external pwr parameters are normal.
- pressing when “AVAIL” ext pwr line contactor closes
- pressing when “ON” ext pwr line contactor opens
Overhead Panel Switches
23-Jan-07 For reference only
EXT B (Momentary Action pb)
AVAIL Lt – Green if all external pwr parameters are normal.
- if APU gen off, pressing when “AVAIL” ext pwr line contactor closes.
- pressing when “AUTO” ext pwr line contactor opens
Note 1:
* APU has priority over EXT A & B for AC BUS 1.1 & 1.2 (AC BUS 1 A330)
* EXT A has priority over APU for AC BUS 2.3 & 2.4 (AC BUS 2 A330)
* APU has priority over EXT B for AC BUS 2.3 & 2.4 (AC BUS 2 A330)
* ENG gens have priority over EXT A & B or APU
* EXT B has priority over EXT A for AC BUS 1.1 & 1.2 (AC BUS 1 A330)
Note 2: When EXT B is AUTO, AUTO Lt remains illuminated even when APU has taken over.
EMER ELEC PWR PANEL
EMER GEN TEST
Pressed – Activates the emergency generator and connects gen to ESS
network.
- This test is inhibited when slats are extended.
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