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The EXP BUS mounting tray is the ultimate in quick build time savings. The tray comes Pre-punched, and pre-assembled with rocker switches prewired to the PC board. All the builder needs to do is to cut a single rectangular hole in the panel, connect the battery, alternator, and all of the load wires to the proper terminals on the EXP BUS2 PC board mounted in the chassis.
14V DC systems (not recommended for 28V aircraft)
KITPLANE
ELECTRICAL SYSTEM ON A PC BOARD:
- EXPBUS
II--Second generation design
- Simplifies
and organizes wiring
- Saves
time, panel space, weight, and money
- Solid
state "fuses" eliminate breakers
- Avionics
master switch/starter cutout
- "Soft
Start" extends landing light life
- Overvoltage
protection
- Clearance
delivery input for NavCom
- Dual
bus option for backup battery
A
Complete Electrical System
The EXPBUS 2 DC Load Center replaces
all but one circuit breaker in most homebuilt aircraft, and
includes the master switch, master relay, and the avionics
master switch. The avionics output bus provides six protected
circuits, and automatically shuts off when the starter is
engaged. Three master bus outputs operate items such as panel
lights, gyros and engine instruments. Switched outputs include
the alternator field, Beacon/Strobe output, nav light output,
aux fuel pump output, two landing light outputs, and two spares.
All outputs are overload protected, eliminating the need for
fuses or circuit breakers, and saving the labor of installing
and wiring them up.
Better Than Fuses
EXPBUS II products are solid state protection
devices that function very much like circuit breakers. When
overloaded, these devices "blow," and the offending
circuit safely shuts down. Unlike a fuse, the devices reset
themselves, unharmed, after the load is removed for several
seconds. Unlike breakers, there are no contacts to weld "on."
Once tripped, these devices will remain "off" until
the original load is completely removed for several seconds.
These proven devices are annually used in hundreds of thousands
of automobiles.
Free Time For Sale
Mounting requires drilling a few holes
in the panel and bolting the unit in. Connect the battery
cable directly to the terminal, and power leads from any devices
such as radios, lights, gyros, and pumps to the proper switch
or terminal on the PC board. Install one 40 amp breaker between
the alternator and the PC board. All other outputs from the
PC board are overload protected. There are no other fuses
or circuit breakers to buy or install. Just think of the drilling,
mounting, cutting, crimping, routing, labeling, and troubleshooting
you will save (not to mention skinned knuckles and bleeding
fingers). AND, while you save time, you will be getting a
clean high-tech installation, with virtually no unfused wiring
behind the panel. The switches can even be easily removed
from the PC board, allowing the board to be remote mounted,
anywhere in the aircraft.
Advanced Features
The Clearance delivery circuit allows
one avionics bus output to be powered up with the master switch
off--very handy at busy airports. The overvoltage protection
circuit locks out the alternator field if the bus voltage
ever exceeds 18 volts. The landing light outputs feature "soft
start" circuits to greatly extend landing light bulb
life. With the backup battery option, the two AUX outputs
and one nav-com can automatically be powered by a standby
power source in the event of a failure of the primary electrical
system. The standby battery is automatically charged from
the master bus during normal operation, eliminating the need
for dual alternators in most cases.
SPECIFICATIONS:
- Maximum
Current Capacity - 40 Amps
- Bus Voltage
- 14 Amps
- Keep-Alive
Output (1, not switched) - 3 Amps
- Master
Outputs (2, always on with master) - 1 Five Amp, 1 Seven
Amp
- Instrument
Light Output - 3 Amps
AVIONICS MASTER OUTPUTS: (6)
- 1 Seven
Amp Output
- 2 Five
Amp Outputs
- 3 Three
Amp Outputs
SWITCHED OUTPUTS:
- Master
Switch/Avionics Master
- Alternator
Field - 5 amps
- Beacon/Strobe
- 7 amps
- Nav Lights
- 7 amps
- Aux. Pump
- 7 amps
- LDG/Taxi
- 9 amps
- LDG/Taxi
- 9 amps
- Aux.Output
(2) - 11 amps
The above current ratings are based
on "recommended" operating current. Traditional
fuses and circuit breakers are rated in terms of "maximum"
operating current. A 9 amp polyfuse circuit is roughly comparable
to a 14 amp fuse or breaker. The above fuse sizes are a good
match for most sport aircraft, your project will probably
work well with this configuration. For a small additional
charge, we can configure your board with any size (1 to 11
amps) breakers in any position.
Size: 9.75" long by 4.625" deep by 1.875" tall. Weight
0.8 lbs.
BLOCK DIAGRAM:
Avionics Support
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