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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
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 14/44
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 : AC ESS BUS is supplied by AC BUS 1.
ALTN : AC ESS BUS is supplied by AC BUS 2.
FAULT lt : The amber light, and ECAM caution come on, when the AC ESS BUS is not
electrically-supplied.
Note: In case of a 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) GALY & CAB pushbutton
AUTO : Main galley, secondary galley, in-seat power supply �� and IFE �� system
(prerecorded announcement, telephone system, video/airshow, music …), are
supplied.
The main galley, the in-seat power supply �� and the IFE �� system are
automatically shed :
‐ In flight : When only one generator is operating.
‐ On 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, secondary galley, in-seat power supply �� and IFE �� system
are not supplied.
FAULT lt : The amber light, and ECAM caution come on, when the load on any
generator is more than 100 % of rated output.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 15/44
FCOM 19 AUG 10
(9) EXT PWR pb (momentary action)
AVAIL light comes on green, if :
‐ External power is plugged in, and
‐ External power parameters are normal.
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
　
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