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‐ water and toilet system
‐ drain mast ice protection
‐ galley
‐ passengers' entertainment
‐ semi-automatic cargo loading (if installed)
OFF: Switches off all aircraft commercial electrical loads.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 16/44
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ,
, MSN,,
(1) BAT 1 (2) ind.
Shows battery voltage in white.
(2) BAT 1 (2) pb sw
Controls the operation of the corresponding battery charge limiter.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 17/44
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 (3 PP) by closing
and opening of the battery line contactor.
‐ The batteries are connected to the DC BAT BUS in the following cases :
• APU starting (MASTER SW at ON and N < 95 %).
Note: The connection is limited to 3 min when the emergency generator
is running.
• Battery voltage below 26.5 V (battery charge). The charging cycle ends
when battery charge current goes below 4 A.
‐ on ground, immediately
‐ in flight, after a time delay of 30 min .
• Loss of AC BUS 1 and 2 when below 100 kt (EMER GEN not supplying).
‐ If AC BUS 1 and 2 are not energized and the EMER GEN is not supplying :
• battery 1 supplies the AC STAT INV BUS, and, if speed is greater than 50 kt,
the AC ESS BUS.
• battery 2 supplies the DC ESS BUS.
Note: In normal configuration the batteries are disconnected most of the
time.
Note: A battery automatic cut-off logic prevents the batteries from
discharging completely when the aircraft is on the ground (parking).
Automatic battery contactors open when :
‐ The aircraft is on the ground.
‐ The BAT pushbutton switches are at AUTO.
‐ The main power supply (EXT PWR + GEN) is cut off.
‐ Battery voltage is low.
The flight crew can reset the contactors by switching the BAT
pushbutton switch to OFF then to AUTO.
OFF : The battery charge limiter is not operating : the battery line contactor is open.
OFF comes on white if the DC BAT BUS is supplied. Hot buses remain supplied.
FAULT lt : Comes on amber, accompanied by an ECAM caution, when the charging
current for the corresponding battery is outside limits.
In this case the battery contactor opens.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 18/44
FCOM 19 AUG 10
(3) IDG 1 (2) (Integrated Drive Generator) pb sw (guarded)
CAUTION 1. Holding this pushbutton switch in for more than about 3 s may damage the
disconnection mechanism.
2. Do not disconnect the IDG when the engine is not running (or not
windmilling), because starting the engine after having done so will damage
the IDG.
The IDG switches are normally springloaded out.
Pressing this switch disconnects the IDG from its driveshaft : only maintenance personnel can
reconnect it.
FAULT lt : Lights up amber, and ECAM caution comes on, if :
IDG oil outlet ‐ overheats (above 185 °C), or
‐ IDG oil pressure is low (inhibited at low engine speed : N2 below 14 %)
It extinguishes when the IDG is disconnected.
(4) GEN 1 (2) pb sw
ON : The generator field is energized and the line contactor closes if electrical
parameters are normal.
OFF : The generator field is de-energized and the line contactors opens.
The fault circuit is reset.
FAULT lt : Lights up amber, and an ECAM caution comes on, if :
‐ The associated generator control unit (GCU) trips it.
Note: If a differential fault trips the protection, reset action has no effect
after two attempts.
‐ Opening of the line contactor (except if the GEN pushbutton switch is
selected OFF)
(5) APU GEN pb sw
ON : The APU generator field is energized and the line contactor closes if parameters
are normal and the EXT PWR line contactor is open.
The bus tie contactor 1 (2) closes automatically if GEN 1 (2) is not operating.
OFF : The generator field is de-energized and the line contactor opens. The fault circuit
is reset.
FAULT lt : Same as GEN 1 or 2 FAULT
The APU GEN FAULT light is inhibited when APU speed is too low or if the APU
GEN line contactor opens after EXT PWR or ENG GEN takes over.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
　
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