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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
Pilot’s Manual
PM-126A 4-11
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.
The top half of the EMER BATT switch displays EMER when the emergency
battery is powering the emergency battery bus and an airplane
generator, GPU or APU 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, GPU or APU power is not available. A white EMER BATT
annunciator on the Crew Warning Panel (CWP) also illuminates when
the emergency battery is discharging.
ELECTRICAL SYSTEM INDICATORS
Monitoring of the dc electrical system is menu selectable on the EICAS
or MFD displays. Electrical system parameters are usually monitored
on the EICAS SUMRY page while the MFD is usually used for
navigation display, TCAS, WX Radar, Checklists, etc. The SUMRY
display is the power-up default display on the EICAS and MFD.
Electrical system parameters in the form of a system schematic may
also be monitored on the ELEC system schematic on the EICAS or
MFD.
The EICAS/MFD system SUMRY page displays VOLTS, left and right.
These two digital displays are an indication of the voltage on the left
and right essential buses. Depending on what is powering the airplane
electrical system, this can be an indication of airplane main battery
volts, GPU volts, APU volts or airplane generator volts.
Pilot’s Manual
4-12 PM-126A
An indication of EMER-V (emergency bus voltage) is displayed on the
SUMRY page immediately below VOLTS, left and right. Emergency
bus voltage can be monitored on the EICAS/MFD displays. The CAS
also monitors the emergency bus volts and will generate an amber
EMER BUS VOLTS message if emergency bus voltage is less than 22
volts or more than 29.5 volts.
The left and right generator AMPS are displayed below the emergency
bus voltage. There is no display for the amperage being drawn from a
GPU. APU amps are displayed on an indicator located on the APU
control panel.
The last electrical parameter displayed on the SUMRY page is left and
right battery TEMP in degrees Celsius. Battery temperature is
displayed only for airplanes equipped with NICAD batteries.
All of the electrical system information presented on the SUMRY page
is also displayed in a schematic format on the EICAS/MFD ELEC
system schematic page. Additionally, the ELEC system schematic
display shows whether EXT PWR is connected to the airplane and, if
the APU generator is connected, APU amps are also displayed.
Electrical system volts and amps may also be selected for display on
either RMU. Under some conditions, the #1 RMU will automatically
display the first of two backup engine pages which provide engine
operating indications and other system data. The electrical system volts
and amps appear on page 2 of the RMU backup engine displays, which
is selectable with the PGE button on the RMU. After 20 seconds, the
display returns to page 1. Returning the RMU to the communication
and navigation function is accomplished with the RMU PGE button.
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