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NOTE: BCL 1 and 2 also ensure battery power supply to
part of the network during transient
configuration or on ground when no normal power
is available.
BATTERY CHARGE(PUSHBUTTON IN)
When battery voltage is lower than 26.5 Volts and BAT
BUS voltage is higher than 27 Volts (checked by the
acquisition module), the battery is connected via
contactor 6PB1.
When the charge current sensed by the battery shunt
is less than 4 Amps decreasing for 10 seconds on ground
or 30 minutes in flight or following APU start,the
battery is fully charged, the contactor opens and the
battery charge stops.
THERMAL RUNAWAY OR SHORT CIRCUIT PROTECTION
If the charge current is above 10 Amps and increasing
by more than 0.375 Amps per minute or the charge current
is greater than 150 Amps for 90 seconds, the contactor
opens. The Short Circuit Hardware Protection detects
the malfunction of the battery and stops the supply
of the BCL.
COMPLETE DISCHARGE PROTECTION
On ground, when the battery voltage is lower than 23
Volts for 15 seconds, the contactor opens
automatically.
HOT BUS PROTECTION
In order to maintain the HOT BUS supply, the contactor
opens under these conditions:
- discharge current greater than 100 Amps for
300 ms
- discharge current greater than 400 Amps for 5
ms
EMERGENCY CONFIGURATION
The batteries are connected to the BATTERY BUS after
landing in emergency configuration.
The battery contactors are closed by the BCL when the
aircraft speed is lower than 100 Kts.
TMUELBR02-T01 LEVEL 3
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DC GENERATION - BATTERY CHARGE LIMITER D/O
TMUELBR02-P01 LEVEL 3
EFFECTIVITY 24-38-00 Page 3
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EFFECTIVITY Page 395
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DC GENERATION - BATTERY CHARGE LIMITER D/O
APU START
The APU can be started by the batteries alone or by
the normal supply.
When the APU start sequence is initiated (APU master
switch to ON), batteries are connected in order to
withstand the high APU starter motor demand.
When the APU start sequence is completed (50%N1), relay
6KD closes to interrupt the APU START signal.
In flight, in electrical emergency configuration, the
APU start sequence is locked out until the CSM/G is
connected to the network or after 45 seconds.
EMER GEN FAULT CONTROL
In emergency configuration, if the CSM/G is inoperative
or during transient configuration, the FAULT legend
on the emergency generator pushbutton comes on
(controlled by BCL 1 and 2).
BAT FAULT CONTROL
In case of thermal runaway or short circuit, the FAULT
legend of the BAT pushbutton comes on.
An amber message and the ELEC page are displayed on
the ECAM, the MASTER CAUTION lights come on and the
single chime sounds.
NOTE: The 5 Volts for the OFF light are delivered via
15PB and 17PB resistors.
TMUELBR02-T02 LEVEL 3
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DC GENERATION - BATTERY CHARGE LIMITER D/O
TMUELBR02-P02 LEVEL 3
EFFECTIVITY 24-38-00 Page 5
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UF94200
EFFECTIVITY Page 397
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SELF EXAMINATION
When does the protection for complete discharge
open the battery contactor?
A - In flight when the battery voltage is
lower than 23 Volts for 15 seconds.
B - On ground when the battery voltage is
lower than 23 Volts for 15 seconds.
C - When the battery voltage is lower than
23 Volts for 15 seconds at any time.
In flight, in electrical emergency configuration,
the APU start sequence is locked out:
A - Until the CSM/G is coupled to the
network or during 45 seconds.
B - When the CSM/G is coupled to the network.
C - 45 seconds after the CSM/G is coupled to
the network.
TMUELBR02 LEVEL 3
EFFECTIVITY 24-38-00 Page 6
Jun 30/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 24 ELECTRICAL POWER
UF94200
EFFECTIVITY Page 398
ALL
24 - ELECTRICAL POWER
24-38-00 DC GENERATION - BATTERY
COMPONENTS
CONTENTS:
　
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