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tied or split manually using the BUS-TIE switch on the electrical control
panel, except the bus-tie cannot be manually opened when a GPU is being
used.
The CAS presents a BUS TIE CLSD message when the bus-tie is closed
and a BUS TIE MANUAL message when closed manually. Also, the bar
on the BUS-TIE switch illuminates any time the BUS-TIE is closed and
it extinguishes when the bus-tie is open.
MAIN BUSES
The left and right main buses are fed by the respective left and right
generator buses through fuses and contactors. The main buses, in turn,
supply power to the left and right main avionics buses through circuit
breakers and contactors. Both of the main buses are automatically
disconnected in the unlikely event of a dual generator failure and the
OFF caption will illuminate on the MAIN bus switches. The main
avionics buses will also be depowered in this case, but the OFF caption
does not illuminate on the AV MSTR switches since the essential
avionics buses will still be powered. The main and main avionics buses
may be reconnected by manual selection after reducing the bus load.
MAIN AVIONICS BUSES
The left and right main avionics buses are supplied by the respective
main buses through contactors and circuit breakers. The essential and
main avionics bus contactors are closed and opened by manual
selection of the left and right AV MSTR switches. If the AV MSTR
switches are on, the main avionics buses are automatically depowered
during engine starting to prevent possible equipment damage from
voltage spikes.
The essential avionics buses remain powered during engine start since
they power flight critical display units. The AV MSTR switches need
not be on during ground starts since the primary flight displays are not
needed and DU2 (EICAS) is still powered with the AV MSTR switches
OFF.
Pilot’s Manual
4-18 PM-126A
ESSENTIAL BUSES
All essential power loads are connected to the left and right essential
buses, including cockpit warning systems and the engine, flap,
hydraulic, pressurization, and spoiler controls. Normally, the essential
buses are fed by the left and right generator buses respectively through
150-amp fuses, essential bus contactors and 80-amp circuit breakers.
The left and right essential bus contactors automatically close when the
respective left and right BATT switches are turned on and they
automatically open during starter operation. The essential buses are
tied together by a left and right isolation contactor so that they are both
powered by the emergency battery during engine start and they will be
powered by either generator bus if an essential bus contactor should
fail in flight.
ISOLATION CONTACTORS
There are two isolation contactors located within the electrical system.
The right isolation contactor is located between the right essential
contactor and the emergency battery bus, and the left isolation
contactor is located between the left essential contactor and the
emergency battery bus. The isolation contactors are automatically
controlled and there are no provisions for the crew to manually
override their operation.
Except during starter-assisted engine start, the left isolation contactor is
normally open and the right isolation contactor is normally closed.
With the right isolation contactor closed, the right generator bus
powers the emergency battery bus and charges the emergency battery.
During ground engine starting and for starter-assisted airstarts, the
isolation contactors close and the left and right essential contactors
automatically open. This allows the emergency battery to power the
emergency battery bus, essential buses, and essential avionics buses
and isolates these buses from voltage fluctuations caused by starter
operation. After starter drop-out, the left isolation contactor opens and
the essential contactors close.
Pilot’s Manual
PM-126A 7 - 3 / 7 - 4 (Blank)
L ESS AV BUS L ESS BUS
GPU
L MAIN AV BUS L MAIN BUS
L GEN BUS
L MAIN
BATT
GCU
EMER BATT BUS R ESS BUS R ESS AV BUS
R MAIN BUS R MAIN AV BUS
EMER
BATT
R GEN BUS
GCU
R MAIN
BATT
REAR HOT BUS
GEN
L START R START
GEN
35A
80A
R ISOLATION*
CONTACTOR
20A 100A
150A
15A
L ISOLATION*
CONTACTOR
80A 100A
35A
35A 35A
R ESSENTIAL*
CONTACTOR
ANTIÐFLASH
CONTACTOR
L ESSENTIAL*
CONTACTOR
40A
40A
20A
40A
40A
L NON-ESS BUS
80A 130A 150A
R NON-ESS BUS
150A 130A 80A
　
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