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The electrical control panel consists of an illuminated panel with 13 (14
when an APU is installed) switches. Each switch incorporates lighted
captions showing system status (i.e. OFF/ON). All captions have white
letters on a black background except for AVAIL on the GPU and APU
switches, which are green on a black background. For normal flight
conditions, none of the switch captions should be illuminated.
ELECTRICAL SWITCHES
Following is a description of the switches on the electrical control
panel:
L/R BATT — The battery switches are momentary action switches. If
the aircraft electrical system is powered (one BATT, EXT PWR, APU
GEN or GEN on), the OFF caption will be illuminated in the L/R BATT
switch whenever the corresponding battery contactor is open. If the
battery meets satisfactory voltage and temperature conditions, the OFF
caption will extinguish when the switch is momentarily depressed and
the battery contactor will close, connecting the battery to the respective
generator bus. The switch will be blank when the battery is on. It will
also be dark (with no OFF annunciations illuminated) when there is no
electrical power applied to the airplane even though the contactor
would be open in this case. The battery contactor will open and the OFF
caption will illuminate if the battery switch is depressed a second time
or if the battery is automatically turned off due to an overheat or an
undervoltage condition.
BUS-TIE — Normal automatic operation of this momentary action
switch displays a horizontal bar when the generator buses are tied and
no indication will be illuminated when the buses are split. Automatic
bus-tie operation is described under DISTRIBUTION in this section.
If required, this switch may be depressed to manually override an
automatic bus-tie operation to provide a split system or to tie the
electrical system together. One exception is that it cannot be used to
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.
Pilot’s Manual
4-10 PM-126A
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.
APU GEN—The APU GEN switch is a momentary action switch. The
green “AVAIL” illuminates when the APU generator is in generating
mode and ready to be connected to the aircraft electrical system. When
pressed, the AVAIL caption extinguishes and the white “ON” is
illuminated. If the switch is depressed again, ON is extinguished and
AVAIL is re-illuminated until the APU falls below 92% normal running
rpm.
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 or APU engine 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 override
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.
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;
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