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open the bus-tie when it has been closed automatically due to GPU
operation. The bus-tie manual selection may also be used, in
accordance with AFM procedures, to close the bus-tie if it fails to
automatically close within five seconds after an inflight generator
failure. When the bus-tie switch is depressed, a MAN (manual) caption
is illuminated to show that the automatic operation is disabled and the
bus-tie will be held in the existing position until deselected by the crew.
The CAS also provides a BUS TIE CLSD and BUS TIE MANUAL
message.
EXT PWR — The external power switch is a momentary action switch.
The green AVAIL caption will illuminate only when a supply of correct
voltage and polarity is sensed on a connected GPU. When the EXT
PWR switch is pressed to provide external power to the aircraft, AVAIL
extinguishes and the white ON is illuminated. The ON caption indicates
that the contactor is closed, connecting the GPU to the left generator
bus.
L/R GEN—These are momentary action switches. Normal generator
operation is automatic and the OFF indication changes with the on/offline
operation of the generator. If a battery start is made, the generator
will automatically come on line after start and the OFF caption will extinguish.
If the start is made with GPU power connected, the generators
will not come on line until the GPU is deselected or disconnected. With
the generator on line, the pilot may select to over-ride the automatic operation
and select it off line by pressing the generator switch. Depressing
the switch when the generator is off line also initiates a reset signal
to the GCU which eliminates the need for a separate momentary generator
reset switch.
Pilot’s Manual
PM-132A 4-11
If a generator trips off line, the switch displays OFF and the CAS
displays an amber L or R GEN FAIL message. In accordance with AFM
procedures, the GEN switch should be depressed once to attempt a
reset. If the generator does not reset, the switch again illuminates OFF.
If both generators are off or failed, a red L R GEN FAIL message will be
displayed by the CAS and a red GEN FAIL annunciator on the CWP
will also illuminate. The L R GEN FAIL messages on the CAS will not
display if the corresponding thrust lever(s) is/are in the cutoff position;
instead a white L R ENG SHUTDOWN collector message will be displayed.
L/R NON-ESS & L/R MAIN — These momentary action switches are
only depressed if the crew needs to override the automatic operation of
these buses during generator failure. The OFF indication changes
automatically to indicate bus condition. Selection of the switch in
normal operation (both generators on line) will isolate the
corresponding bus and display OFF. Reselection resumes normal
operation. The non-essential buses will automatically be OFF
whenever the electrical system is being powered strictly by battery
power and also in flight if one generator fails. The main and nonessential
buses will automatically be shed in-flight if both generators
have failed.
L/R AV MSTR — These switches are alternate action and allow the
crew to connect or disconnect both main avionics and essential avionics
buses by manual selection. The main avionics bus contactors
automatically open during engine start on the ground and during
starter-assisted airstart.
EMER BATT — The bottom half of this alternate action switch displays
OFF when manually selected to OFF (i.e. emergency battery contactor
de-energized). This switch is selected on before engine start and will
normally remain on during flight. The OFF caption will extinguish
when the switch is selected on.
Pilot’s Manual
4-12 PM-132A
The top half of the EMER BATT switch displays EMER when the emergency
battery is powering the emergency battery bus and an airplane
generator, or GPU is not providing power to the emergency battery
bus. This provides advisory information that the battery is discharging
and should not be left on for an extended period while on the ground.
In flight, this is an indication that generator power to the emergency
battery bus has been lost and that the emergency battery is powering
the emergency battery bus. It is normal for this annunciator to be illuminated
during start and for a short period before start when generator,
or GPU power is not available. A white EMER BATT annunciator on
the Crew Warning Panel (CWP) also illuminates when the emergency
battery is discharging.
Pilot’s Manual
PM-132A 4-13
ELECTRICAL SYSTEM INDICATORS
Monitoring of the dc electrical system is menu selectable on the EICAS
　
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