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logic in order to maintain power supply to all AC buses.
When a generator is lost, the associated AC ‐ BUS bar remains supplied through
its associated BUS TIE contactor and the adjacent one which will automatically
close.
‐ When the aircraft is supplied only by APU generator or single ground power
unit, the five contactors close.
‐ When the aircraft is supplied by only two generators located on the same side
the following contactors will close :
• the two contactors associated to both lost generators
• the contactor associated to the external running generator
• the fifth contactor (located between left and right side).
OFF : The five BUS TIE contactors open.
Note: Selecting the BUS TIE pushbutton to OFF then AUTO on the ground inhibits the
NBPT function.
The function may be recovered by switching OFF all aircraft electrical sources and
resetting GPCU with ground power unit disconnected.
(12) EXT A pb : (momentary action)
AVAIL lt : Illuminates green provided external power parameters are normal.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 6/48
FCOM 19 AUG 10
Momentarily
pressed
: ‐ If the AVAIL light was on :
• The external power line contactor closes
• The AVAIL light goes off
• The ON light comes on blue
‐ If the ON light was illuminated :
• The external power line contactor opens
• The ON light goes off
• The AVAIL light comes on.
(13) EXT B pb : (momentary action)
AVAIL lt : Illuminates green provided external power parameters are normal.
Momentarily
pressed
: ‐ If the AVAIL light was on :
• Provided the APU generator is off the external power line contactor
closes
• The AVAIL light goes off
• The AUTO light comes on.
‐ If the AUTO light was on :
• The external power line contactor opens
• The AUTO light goes off
• The AVAIL light comes on.
Note: The APU generator has priority over external power (A and B) for AC BUS 1.1 and
AC BUS 1.2.
The external power A has priority over the APU GEN for AC BUS 2.3 and 2.4.
APU generator has priority over external power B for AC BUS 2.3 and 2.4.
The engine generators have priority over the external powers or APU.
The external power B has priority over external power A for AC Bus 1.1 and AC BUS
1.2.
When external power B is selected AUTO, AUTO light remains illuminated even when
the APU generator has taken over.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 7/48
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ,
(1) BAT 1 (2 or APU) sel
Selects the battery for voltage indication.
(2) BAT 1 (2 or APU) voltage indication
Selected battery voltage.
(3) BAT 1 (2) pb sw
Controls the operation of the corresponding Battery Charge Limiter.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 8/48
FCOM 19 AUG 10
Auto : The Battery Charge Limiter controls automatically the connection and the
disconnection of the corresponding battery to the DC BAT BUS by closing and
opening of the battery line contactor.
‐ The batteries are connected to the DC BAT BUS in the following cases :
• Battery voltage below 26.5 V (battery charge). The charging cycle ends
when battery charge current goes below 4 A (for 10 s on ground, 30 min in
flight).
• On the ground (with speed below 50 kt), when batteries only are supplying
the aircraft.
• In flight DC generation lost (limited to 7 s).
The batteries are connected to ‐ the DC ESS BUS when batteries only are
supplying :
• in flight
• on the ground (speed below 50 kt) provided they are both selected auto.
Note: 1. In normal configuration the batteries are disconnected most of the
time.
2. A battery automatic cut off logic prevents batteries from discharging
completely discharge when the aircraft on the ground (parking).
Automatic battery contactors open when :
‐ The aircraft is on the ground.
‐ The main power supply (external power plus all generators) is cut
off.
‐ The battery voltage is lower than 23 V for more than 16 s.
The flight crew can reset the contactors by switching the BAT
pushbutton switch to OFF then AUTO.
OFF : The Battery Charge Limiter is not operating, the DC ESS BUS is not connected to
the battery (except in flight in emergency configuration).
　
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