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the battery (except in flight in emergency configuration).
OFF comes on white if the DC BAT BUS is powered.
Hot buses remain supplied.
FAULT lt : Comes on amber accompanied by an ECAM caution, when the charging current
for corresponding battery is outside limits.
In this case the battery contactor opens.
(4) APU BAT pb sw
Controls the operation of the APU Battery Charge Limiter.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 3/48
FCOM 19 AUG 10
AUTO : The APU Battery Charge Limiter automatically controls the closure/opening of the
line APU BAT contactor.
The battery is connected in the following cases :
• To ensure battery charge (as for BAT 1 or 2)
• When the APU start sequence is initiated.
Note: Automatic cut off, as for BAT 1 or 2, is provided.
OFF : The Battery Charge Limiter is not operating, the battery line contactor is open.
OFF light illuminates.
FAULT lt : Illuminates amber associated to ECAM caution activation as for BAT 1 or 2.
In this case the battery contactor opens.
(5) AC ESS FEED pb sw
Normal : The AC ESS BUS is supplied from AC BUS 1.1.
It is automatically supplied by the AC BUS 2.4 when the AC BUS 1.1 is lost.
ALTN : The AC ESS BUS is supplied from AC BUS 2.4.
FAULT lt : Comes on amber accompanied by ECAM activation when the AC ESS BUS is
not electrically supplied.
Note: In case of total loss of main generators the AC ESS BUS is
automatically supplied by the emergency generator or by the static
inverter if the emergency generator is not available.
(6) GALLEY pb sw
AUTO : The galleys are normally supplied. The ECMU automatically controls the
shedding of one or more galleys in case of generator(s) failure or in case of
overload detection. On ground when APU generator or the external power
supplies, all galleys are supplied provided no overload is detected.
OFF : All galleys are shed and water/waste (drain mast) ice protection is lost.
FAULT lt : Illuminates amber associated with ECAM in case of overload detection if the
automatic shedding is not performed.
Note: Switching OFF then AUTO resets the galleys which have been
automatically shed by the ECMU .
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 4/48
FCOM 19 AUG 10
(7) COMMERCIAL pushbutton
OFF : The following equipment is shed :
‐ Galleys
‐ Passenger entertainment system (music and video)
‐ Cargo loading system
‐ Electrical service
Escape ‐ slide lock mechanism ice protection
‐ Water/waste (drain mast) ice protection
‐ Lavatory and cabin lights
‐ Water heater
(8) IDG 1 (2, 3 or 4) (Integrated Drive Generator) pushbutton
Normally springloaded out.
When pressed, the IDG is disconnected from its drive shaft and can only be reconnected by
maintenance action on ground.
CAUTION 1. Maintaining this pushbutton pressed for more than about 3 s, damage may
damage the disconnection mechanism.
2. IDG disconnection is inhibited when engine N2 is below the low speed
threshold.
FAULT lt : It comes on amber, along with an ECAM caution, in case of :
• IDG oil outlet overheat (above 185 °C), or
• IDG oil pressure low. Inhibited at low engine speed (N2 below 14 %).
It goes off when the IDG is disconnected.
(9) GEN 1 (2, 3 or 4) pushbutton
On : The generator field is energized and the line contactor closes, provided electrical
parameters are normal.
OFF/R : The generator field is de-energized and the line contactor opens.
The fault circuit is reset.
FAULT lt : Comes on amber, along with an ECAM caution, in the event of protection trip
initiated by the associated Generator Control Unit (GCU).
The line contactor opens.
Note: If the protection trip is initiated by a differential fault, the reset action has
no effect after two attempts.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 5/48
FCOM 19 AUG 10
(10) APU GEN pb sw
On : The APU generator field is energized and the line contactor closes provided
parameters are normal.
Each bus tie contactor 1, 2, 3 and (or) 4 automatically close if its associated
generator is not operative.
OFF/R : The generator field is de-energized and the line contactor opens. The fault circuit
is reset.
FAULT lt : Same as GEN FAULT.
APU GEN FAULT light is inhibited when APU speed is too low.
(11) BUS TIE pb sw
AUTO : The five BUS TIE contactors open or close automatically according to the priority
　
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