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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)
     APU GEN pb sw
ON
OFF
FAULT It
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.
The generator field is de-energized and the line contactor opens. The fault
circuit is reset.
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.
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃                                ┃                              ┃1.24.20     P 4       ┃
┃                                ┃                              ┣━━━━━┳━━━━━┫
┃I  ~-~ A318                     ┃J     CONTROLSCANDCINDICATORS ┃SEQ 100 1 ┃I REV 28  ┃
┃ aw aw ,, ~L,~ A319             ┃                              ┃          ┃          ┃
┃ Lli,~ A320                     ┃                              ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                              ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                              ┃          ┃          ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━┻━━━━━┻━━━━━┛
(~ BUS TIE pb sw
AUTO
OFF
The bus tie contators (BTCs) open or close automatically in order to
maintain power supply to both AC BUS 1 and AC BUS 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.
Both bus tie contactors open.
(~ AC ESS FEED pb sw
The AC ESS BUS is normally supplied from AC BUS 1.
It may be supplied by AC BUS 2 through the AC ESS FEED pushbutton switch.
NORMAL: The AC ESS BUS is supplied from AC BUS 1.
ALTN   : The AC ESS BUS is supplied from AC BUS 2.
FAULT It : Comes on amber, 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.
(~ GALY 8- CAB pb sw
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual3(16)