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APU generator;
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Cross-side engine-driven generator (example: AC BUS 1 powered by GEN 2); and
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External AC power.
According to the above priority logic, the GLCs and GTCs will automatically tie the main AC buses to any of the available AC power sources, to ensure that the main AC buses remain powered at all times.
ELECTRICAL Description Vol. 2 07.10.12
Oct 05/06
AC BUS 1 (2) Automatic Transfer (AUTOXFER) Switch/Lights
The flight crew may manually inhibit the automatic bus transfer priority logic by pressing the appropriate AUTOXFER switch/light, located on the ELECTRICAL POWER panel. This prevents the corresponding AC BUS from being powered by any source except its on-side engine-driven generator. This may be used to isolate a main AC bus in the event of an electrical emergency (example: electrical smoke or fire). Selection of the AUTOXFER switch/light is indicated by illumination of the corresponding white OFF annunciator on the switch/light, and white AUTO XFER OFF icon on the AC electrical synoptic page.
AC BUS Automatic Transfer
Figure 07.10.10
ELECTRICAL Description Vol. 2 07.10.13
Oct 05/06
Should a bus fault or generator overcurrent condition occur on a main AC bus, the automatic bus transfer priority logic will be inhibited, isolating the fault from the remaining AC electrical system. This condition is indicated by the AC 1 (2) AUTOXFER caution EICAS message, illumination of the corresponding amber FAIL annunciator on the AUTOXFER switch/light, and the amber AUTO XFER FAIL icon on the AC ELECTRICAL synoptic page.
AC BUS Automatic Transfer Fail Figure 07.10.11
AC ESS (Essential) Bus
The AC ESS BUS supplies power to the equipment essential for flight. It is normally powered by AC BUS 1, but may also be powered by AC BUS 2 or the ADG BUS. The AC ESS BUS supplies power to ESS TRU 1, which provides DC power to the DC ESS BUS and the BATT BUS.
Refer to the ADG section in this chapter for information on the ADG BUS.
ELECTRICAL Description Vol. 2 07.10.14
Oct 05/06
AC ESS Bus Transfer
If a loss of power on AC BUS 1 is sensed, the AC ESS BUS is automatically transferred to AC BUS 2. When an automatic transfer to AC BUS 2 occurs, the AC ESS XFER switch/light located on the ELECTRICAL POWER panel illuminates and the AC ESS ALTN status EICAS message appears.
If the automatic transfer fails to occur, the AC ESS BUS can be manually transferred to AC BUS 2 by pressing the AC ESS XFER switch/light.
AC Essential Bus on Alternate Source Figure 07.10.12
AC Utility Buses
AC UTILITY BUS 1 and 2 receive power from AC BUS 1 and 2 respectively. The AC utility buses supply AC power to nonessential cabin equipment.
Utility Bus Shedding
During single-generator operation in flight, AC UTILITY BUS 1 and 2 are automatically load shed, to reduce the electrical load on the remaining generator.
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