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‐ The AC Bus Tie Contactor (BTC) 1.
‐ The APU Generator Contactor.
‐ Both DC Tie Contactors.
‐ The BUS TIE Contactor
‐ The External Power Contactor B
ECMU 2
controls :
: ‐ The Generator Line Contactor (GLC) 2.
‐ The AC Bus Tie Contactor (BTC) 2.
‐ The External Power Contactor A.
‐ Both DC tie Contactors.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - GENERATION OF ELECTRICAL POWER
A330/A340 FLEET DSC-24-10-20-30 P 2/4
FCOM 19 AUG 10
AC AND DC CONTACTOR CONTROL
Applicable to: ,
ECMU 1
controls :
: ‐ The Generator Line Contactor (GLC) 1.
‐ The AC Bus Tie Contactor (BTC) 1.
‐ The APU Generator Contactor.
‐ Both DC Tie Contactors.
‐ The BUS TIE Contactor
‐ The External Power Contactor B
ECMU 2
controls :
: ‐ The Generator Line Contactor (GLC) 2.
‐ The AC Bus Tie Contactor (BTC) 2.
‐ The External Power Contactor A.
‐ Both DC tie Contactors.
NO BREAK POWER TRANSFER
Applicable to: ALL
This function avoids busbar power interruption during supply source transfer on ground in normal
configuration. It is inhibited in flight.
ECMU controls simultaneous connection of the two sources for a short time. To achieve this, both
sources are synchronized on a frequency reference signal sent by the GAPCU.
Synchronization may take up to 15 s for APU GEN with GPU, and some milliseconds in all other
cases.
If synchronization is not achieved within the time allowed, transfer is performed anyway (without
simultaneous connection of two sources). This function has a backup in the GCU.
MONITORING AND INDICATING
Applicable to: ALL
Each ECMU sends the following information to the ECAM:
‐ Busbars supplied or not
‐ Contactor status
‐ Galley supply status, and galley switch position.
For this purpose, each ECMU receives following information:
‐ Voltage of all normal busbars
‐ Position of all AC and DC contactors
‐ Availability of all generators, or power source (from GCU or GAPCU)
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - GENERATION OF ELECTRICAL POWER
A330/A340 FLEET DSC-24-10-20-30 P 3/4
FCOM 19 AUG 10
‐ Position of all galleys' contactors
‐ TR status
‐ Pushbutton position (BUS TIE, GALLEY SHED and COMMERCIAL)
‐ Flight/ground signal from associated LGCIU.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - GENERATION OF ELECTRICAL POWER
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A330/A340 FLEET DSC-24-10-20-30 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - GENERATION OF ELECTRICAL POWER
A330/A340 FLEET DSC-24-10-20-40 P 1/2
FCOM 19 AUG 10
CIRCUIT BREAKERS
CIRCUIT BREAKERS
Applicable to: ALL
All circuit breakers are in the electronic equipment bay.
A Circuit Breaker Monitoring Unit (CBMU) monitors the circuit breaker status. It sends this
information to the ECAM system.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - GENERATION OF ELECTRICAL POWER
Intentionally left blank
A330/A340 FLEET DSC-24-10-20-40 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - OPERATIONS
A330/A340 FLEET DSC-24-10-30-10 P 1/2
FCOM 19 AUG 10
GENERAL
GENERAL
Applicable to:
Each AC BUS is supplied in priority order by :
the ‐ corresponding engine generator.
‐ the APU generator or the external power A (if both are connected, the APU generator has priority
for the left side bars, and the external power has priority for the right side bars).
‐ the external power B (if both external powers are connected, B has priority for the left side bars
and A has priority for the right side bars).
‐ the engine generator located on the same side.
‐ the other side outer engine generator.
The APU generator or an external power may supply all the network.
Two generators can supply all the network (with galley shedding in case of overload detection).
When only one engine generator is available it supplies only its side.
The generators cannot be connected in parallel (except on ground during No Break Power
Transfers).
GENERAL
Applicable to: ,
Each AC BUS is supplied in priority order by :
‐ the corresponding engine generator.
‐ the APU generator or the external power A (if both are connected, the APU generator has priority
　
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