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External AC Electrical Power In Use
Figure 07−10−8
AC ELECTRICAL POWER DISTRIBUTION
Description
115-volt AC electrical power, from the aircraft generators and APU generator, is distributed to five
AC buses through circuit breaker panels. Monitoring of system status is done using the AC
ELECTRICAL synoptic page.
The aircraft AC bus system consists of the following five buses:
• AC BUS 1 (Main);
• AC BUS 2 (Main);
• AC ESS BUS (Essential);
• AC UTILITY BUS 1; and
ELECTRICAL
Description
Vol. 2 07−10−10
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AC ELECTRICAL POWER DISTRIBUTION (CONT'D)
• AC UTILITY BUS 2.
AC ELECTRICAL Synoptic Page
Figure 07−10−9
Components and Operation
AC BUS 1 and AC BUS 2
AC BUS 1 and AC BUS 2 are the main AC buses of the aircraft, and receive power from any of
the three generators, or from external AC power. AC BUS 1 normally supplies power to the AC
ESS BUS and AC UTIL BUS 1. AC BUS 2 normally powers AC UTIL BUS 2.
Bus Priority
AC BUS 1 and AC BUS 2 are protected by a bus priority logic, to ensure that the buses remain
powered at all times. The generator control units (GCUs) determine the bus priority for AC
BUS 1 and AC BUS 2 via the generator line contactors (GLCs) and generator transfer
contactors (GTCs). The bus priority logic for AC BUS 1 and AC BUS 2 is as follows:
• On-side engine-driven generator (example: AC BUS 1 powered by GEN 1);
• APU generator;
• Cross-side engine-driven generator (example: AC BUS 1 powered by GEN 2); and
• 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 07−10−11
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AC ELECTRICAL POWER DISTRIBUTION (CONT'D)
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 07−10−12
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AC ELECTRICAL POWER DISTRIBUTION (CONT'D)
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 07−10−13
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AC ELECTRICAL POWER DISTRIBUTION (CONT'D)
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.
　
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