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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
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 4/44
FCOM 19 AUG 10
(6) BUS TIE pushbutton
AUTO : The bus tie contactors (BTCs) automatically open or close to maintain power
supply to both AC BUS 1 and 2.
‐ One contactor is closed, when :
• One engine generator supplies the associated AC BUS, and
• The APU generator, or external power supplies the other side.
‐ Both contactors are closed during single-engine operation, or operation on the
APU generator, or external power supply.
OFF : Both bus tie contactors open.
(7) AC ESS FEED pushbutton
The AC ESS BUS is normally supplied from AC BUS 1.
It may be supplied by AC BUS 2, via the AC ESS FEED pushbutton .
NORMAL : The AC ESS BUS is supplied from AC BUS 1.
ALTN : The AC ESS BUS is supplied from AC BUS 2.
FAULT lt : The amber light, and ECAM caution comes on, when the AC ESS BUS is not
electrically supplied.
Note: In case of total loss of main generators, the AC ESS BUS is
automatically supplied by the emergency generator, or by the static
inverter if the emergency generator is not available.
(8) GALLEY pb sw
AUTO : Main galley and secondary galley are supplied.
The main galley is shed automatically when :
In flight : When only ‐ one generator is operating.
‐ On the ground : When only one engine generator is operating. (All galleys
are available when the APU GEN or EXT PWR is supplying power.)
OFF : The main galley and secondary galley are not supplied.
FAULT lt : The amber light, and ECAM caution comes on, when the load on any
generator is more than 100 % of rated output.
(9) EXT PWR pb (momentary action)
AVAIL light comes on green, if :
‐ External power is plugged in, and
‐ External power parameters are normal.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 5/44
FCOM 19 AUG 10
Pressed momentarily :
‐ 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 on :
• The external power line contactor opens.
• The ON light goes off.
• The AVAIL light comes on.
Note: 1. External power has priority over the APU generator. The engine generators have
priority over external power.
2. The ON light stays on, even when the engine generators supply the aircraft.
(10) COMMERCIAL pb sw ��
ON : All aircraft commercial electrical loads are supplied :
‐ cabin and cargo lights
‐ 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 6/44
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
(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 7/44
FCOM 19 AUG 10
Auto : The battery charge limiter controls automatically the connection and the
　
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