VAL Avionics NAV 2000 Guide d'installation télécharger pdf (Page 209)

Autopilot Servo Installation, Configuration, and Calibration

SkyView System Installation Guide - Revision R 10-15

Considerations for External LEVEL Button

in SkyView systems with multiple SkyView displays

Prior revisions of the SkyView System Installation Guide recommended that in

SkyView systems with multiple displays, for redundancy the External LEVEL Button

should be connected to all SkyView displays in parallel. The following

recommendations supersede that earlier guidance.

Do not connect CONTACT 1 / LEVEL BUTTON inputs of multiple SkyView displays

directly together. If you do so, when one display is powered off, it will cause

displays that are powered on to see the CONTACT 1 / LEVEL BUTTON input as

being pushed (the display powered off will “ground” the input). This could cause

the unintentional activation of LEVEL mode or could prevent the External Level

Button from operating.

Installation options installing the External LEVEL Button on systems with multiple

SkyView displays:

1. Connect the External LEVEL Button to only one display. The External LEVEL

Button will operate for all displays in the SkyView system as long as the

display the External LEVEL Button is wired to is powered on and operating

normally. As a non-flight-critical function, the loss of the External LEVEL

Button in some display failures may be acceptable for your installation. Use

of the LEVEL function via the SkyView soft keys via any operating SkyView

display is still possible, as well as pushing the LEVEL button on the

(optional) SV-AP-PANEL.

2. Install a diode for each individual display’s connection to the External

LEVEL button. The diode should be installed with the cathode end (painted

band on the diode) oriented towards the External LEVEL button, and

should be installed in-line with the contact wire between the SkyView

display and the External LEVEL button. One diode is needed per display.

Any diode will work for this application. An example diode is the very

common 1N914, available from Radio Shack (P/N 276-1122). With a diode

installed for each display, the External LEVEL Button will work correctly

with any combination of displays powered on and powered off.

3. Use a multi-pole pushbutton (momentary, normally open / push to close)

for the External LEVEL Button. With this option, run each display's

connection to a different pole on the pushbutton. With the multi-pole

pushbutton installed, the External LEVEL Button will work correctly with

any combination of displays powered on and powered off.

Wire Sizing

While it is beyond the scope of this installation guide to advise on specific types of wiring for a

particular aircraft, choice of wiring should be sized to 1) minimize voltage drop over the length

of the particular wiring run, and 2) conduct the amount of current required by the subsystem

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VAL Avionics NAV 2000 Guide d'installation Page 209