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AIRSPEED RELAY USE:
1.) Protection against accidental Flap
Deployment Protection at High Airspeeds
When our relay board is used with
our airspeed switch, you can protect you flaps from being actuated in the
downward direction when your airspeed is too high (above the white arc). We
provide the end user with easy connection diagrams for several different
systems.
2.) Automatic Elevator Trim Motor Speed Adjust at
different airspeeds
Many have complained about the
fast adjustment speed of elevator trim motors at high airspeeds. When our relay
board is used with our airspeed switch, it eliminates this problem. You will
have two speeds, fast for slower airspeeds, and slower for high airspeeds. The
slower speed is adjusted by supplying this relay board a lower motor drive
voltage.
DETAILS for the
Automatic Elevator Trim Motor Speed Adjust
1.) Connect the airspeed switch to
your aircraft pitot tube and static air.
2.)
Connect the airspeed switch output, to
drive the relays on the relay board. See the appropriate diagram below.
NOTE: The airspeed sensor will only drive light loads such as the relay
board coils.
3.) Use the
output of the relay board to switch from one of two voltages that will be used
to drive your elevator trim motors.
4.) The one item you will have to supply, is the alternate lower voltage source for
your slower speed. You may use simple diodes or zener diodes in series with your
12Vdc supply, or use an adjustable source like the "Ray Allen Company's" Speed
Control. Click the link below to view and/or print out a suggested
connection diagram.
(Airspeed Relay
Board Connection Diagram)
DETAILS for the
Flap Deployment Protection
1.) Connect the airspeed switch to
your aircraft pitot tube and static air.
2.)
Connect the airspeed switch output, to
drive the relays on the relay board. See the appropriate diagram below.
NOTE: The airspeed sensor will only drive light loads such as the relay
board coils.
3.) Use the
output of the relay board to activate or disable your flap down electronics.
See the appropriate diagram below.
(Flap Deployment
Protection Diagram)
SPECIFICATIONS:
AIRSPEED SWITCH
Pull-in airspeed adjustable with a screw driver
Switch Current Rating: 0.04A max.
Adjustable
from 70 MPH to 160MPH
RELAY BOARD
Mounting Hardware included
Relay contacts protected against arcing from inductive loads such as motors.
Switch contacts
Two relays, SPDT (Single Pole, Double Throw)
10A max. current
Relays are 12V relays
Simply CLICK the PayPal logo to the left to pay by
credit card.
or click here to see other Methods
of Payment
Ohio Residents will pay 6.75%
tax.
NOTE:
We can supply
24 - 28V relay boards on request.
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