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A318/A319/A320/A321 FLEET DSC-24-10-20 P 2/4
FCOM 19 AUG 10
AC GENERATORS
Applicable to:
,
,
MSN,,,,
ENGINE – DRIVEN GENERATORS
Two three-phase AC generators (GEN 1, GEN 2), one driven by each main engine through an
integrated drive, supply aircraft electrical power. Each generator can supply up to 90 KVA of power
at 115 and 200 V and 400 Hz.
Two Generators Control Units (GCU) control the output of their respective generator. The main
functions of each GCU are :
‐ Control the frequency and voltage of the generator output.
‐ Protect the network by controlling the associated generator line contactor (GLC).
APU GENERATOR AND EXTERNAL POWER
A third generator (APU GEN), driven directly by the APU and producing the same output as each
main engine generator, can replace either or both main engine generators at any time.
A ground power connector near the nosewheel allows ground power to be supplied to all busbars.
A Ground and Auxiliary Power Unit (GAPCU) :
‐ Controls the frequency and voltage of the APU generator and external power output.
‐ Protects the network by controlling the external power contactor and the APU Generator Line
Contactor.
EMERGENCY GENERATOR
The blue hydraulic circuit drives an emergency generator that automatically supplies emergency
AC power to the aircraft electrical system, if all main generators fail. This generator supplies 5 KVA
of three-phase 115 and 200 V 400 Hz power.
A Generator Control Unit (GCU) :
‐ Keeps the emergency generator at a constant speed,
Controls the ‐ generator's output voltage,
‐ Protects the network by the controlling the emergency generator line contactor, and
‐ Controls the emergency generator start-up.
STATIC INVERTER
A static inverter transforms DC power from Battery 1 into one KVA of single-phase 115 V 400 Hz
AC power, which is then supplied to part of the AC essential bus. When the aircraft speed is above
50 kt, the inverter is automatically activated, if nothing but the batteries are supplying electrical
power to the aircraft, regardless of the BAT 1 and BAT 2 pushbutton positions.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - GENERATION OF ELECTRICAL POWER
A318/A319/A320/A321 FLEET DSC-24-10-20 P 3/4
FCOM 19 AUG 10
When the aircraft speed is below 50 kt, the inverter is activated, if nothing but the batteries are
supplying electrical power to the aircraft, and the BAT 1 and BAT 2 pushbuttons are both on at
auto.
DC GENERATION
Applicable to: ALL
TRANSFORMER RECTIFIERS (TRS)
Two main transformer rectifiers, TR 1 and TR 2, supply the aircraft's electrical system, with up to
200 A of DC current.
A third (identical) transformer rectifier, the ESS TR, can power the essential DC circuit from the
emergency generator, if the engine and APU generators all fail, or if TR 1 or TR 2 fails.
Each TR controls its contactor by internal logic.
BATTERIES
Two main batteries, each with a normal capacity of 23 Ah, are permanently connected to the two
hot buses.
Each battery has an associated Battery Charge Limiter (BCL).
The BCL monitors battery charging and controls its battery contactor.
CIRCUIT BREAKERS (C/BS)
Applicable to:
The aircraft has two types of C/Bs :
‐ Monitored (green) : When out for more than one minute, the C/B TRIPPED warning is triggered on
the ECAM.
‐ Non-monitored (black).
Moreover, there are yellow rings on the C/B’s, which must be pulled when flying on batteries only
(Refer to DSC-24-10-30-30 FLIGHT WITH BATTERIES ONLY). The Wing Tip Brake (WTB) C/Bs
have red caps on them to prevent them from being reset.
The C/B TRIPPED warning on the ECAM indicates the location of the affected C/B. The following
panels are monitored : OVHD PNL, L(R) ELEC BAY, REAR PNL J-M or N-R or S-V or W-Z.
Note: The C/B TRIPPED caution may be cleared from the ECAM by pressing the CLR or the
EMER CANCEL pushbutton. If the EMER CANCEL is used, and if a second C/B is tripped
on the same panel, the corresponding C/B TRIPPED caution will not be triggered.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - GENERATION OF ELECTRICAL POWER
A318/A319/A320/A321 FLEET DSC-24-10-20 P 4/4
FCOM 19 AUG 10
CIRCUIT BREAKERS (C/BS)
Applicable to:
,
,
MSN,,,,
The aircraft has two types of C/Bs :
Monitored (green) : When out for more than one minute, the C/B TRIPPED ‐ warning is triggered on
the ECAM.
‐ Non-monitored (black).
The Wing Tip Brake (WTB) C/Bs have red caps on them to prevent them from being reset.
　
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