Servo Wiring

[rogersmart]

I have purchased the pitch and roll servos and installation kits for the RV8 I am building.   I am patiently waiting for the new generation system.  However I want to install wiring to each servo before I move forward with closing the wing and aft fuselage.

I have reviewed the current wiring overview that was sent with each servo.  From previous post I gather the wiring may be different with the new generation system and the White/Green and White/Blue wires will be used.

Please honor my patronage of Dynon and help me move forward by answering the following questions.

1. I assume the Red wire (Power) sized for 2 amps and to a breaker wired as shown in overview. The Black (Ground) also sized for 2 amps can be grounded to the airframe at the servo.  Are these assumptions correct?

2. Green and Blue (Data) wires can be 20 or 22 AGW and a twisted pair since they are data wires.  Are these assumptions correct?

3. The Yellow (disconnect) wire can be 20 or 22 AGW as virtually no current is present.  Is this assumption correct?

4. The new generation data bus wires will be a similar in that it is 2 wire and data wires from any component in the system can tap into data wires from another component, ie they do not have to run back to a specific module or screen.  Are these assumptions correct?

5. White/Green and White/Blue wires.  My main concern is what size and type of wire to use and where will it be run.  What will the function of the wires be.  I’m not looking for corporate secrets just want to move forward with my build.  If it is a trim motor adjustment the wire would be run to a different location than another purpose.  Please provide what info you can for the sole purpose of running wire.

Thanks in advance for your help.  

 

[dynonsupport]

1) Yes
2) Yes
3) Yes
4) Right. They're another pair of DSAB wires that will be used to provide data redundancy in the next generation product. The topology of the next generation network is the same in that they do not have to run back to a specific module or screen.
5) They're data wires, just like the current green and blue wires, with the same eventual requirements. We didn't call this out on the spec sheet since the AP specs were out before we started talking about some of the next gen details.

 

[rogersmart]

White/Green and White/Blue wires: You state "They're data wires, just like the current green and blue wires, with the same eventual requirements"

Will the topology of these wires be the same as the primary DSAB in that they can tap (parallel) to the redundent network at any point? You have given me informatin to select the type of wire. I need to know where to route these wires. My guess would be to the panel area.

 

[dynonsupport]

Topology is identical, but this will be a redundant circuit, so none of the DSAB A and B wires will be connected to any of the DSAB C and D wires (not their official names, fyi). Remember that the requirement for DSAB is only that all of the As and Bs be electrically connected - there's no specific order that they need to be in (ie, everything's in parallel, not serial or daisy-chained).

Just bring the two other wires to the panel area and you'll be fine.

 

[rogersmart]

I am now thinking of prewiring and pre-plumbing for the ADAHRS before closing off the aft portion of the fuselage. From the copied post below, I am making some assumptions. Please reveiw this and correct me where I am wrong or where you would do this differently.

I plan on mounting the ADAHRS aft behind the rear baggage compartment well above and slightly behind the pitch servo to achieve a 1 to 2 feet seperation and isolation from other airframe and panel electrical. The mounting panel will be level with the in-flight attitude. The ADAHRS pre-wiring will consist of 2 twisted pairs for DSAB A&B, C&D, Power and Ground running back to the panel area to be eventually connected to the screen for power. Plumbing for Pitot, Static and AOA will be routed to ADAHRS.

Also will the ADAHRS accept any external inputs such as flap position or outside temperature. If not I assume these inputs will be to the screen.

One last question, how will the system sense flap position, is it the same as the current system, can it be ordered now.

Thanks


FROM EARLIER POST:
Quote:
2. Is the AHRS or ADAHRS module going to include magnetic heading internally or require an external module like the EDC-D10? Will there be a restriction on mounting adjacent to steel parts, strobe power supply, strobe wiring or adjacent to the autopilot servos. Can it be mounted behind the panel near a radio? What is a safe distance from these items. Please give some guidance.

At least at first, the ADAHRS will include the magnetometer internally. The whole thing will be really small, similar to the size of the current EDC-D10A.

Generally, you want to be at least 1-2 feet away from ferrous metal and power.

 

[dynonsupport]

Between each module (ADAHRS, EMS, etc) and the screen, there will be a 9 pin connector needed, all of which are used. Basically, you've got dual power, dual ground, dual DSAB (four wires), and the last is another fixed 12V power supply which is used for other lowish amperage things that needs external power (like fuel flow, for example). So you'll want all of those wires run between your ADAHRS location and your screen location.

The ADAHRS will have an OAT input, similar to our current system, but that's it.

Flaps/trim/other resistive inputs will be via the optional EMS module (similar to how they're supported via the stand-alone EMSes today). Like today, we won't be selling those sensors, but the Ray Allen flaps sensors and trim motor outputs will continue to work.

 

[rogersmart]

Continuing with the NG ADAHRS placement and wiring before I close up the aft end of my project. I have read the installation for the current remote compass for guidance and have a few more questions.

1. My future placement of the NG ADAHRS is 24” from the pitch servo, 14” from rudder cables, 6” from the manual trim cable ad will be mounted using brass screws and nuts. Is this an appropriate location. I am worried about the proximity to the trim cable.
2. You state the ADAHRS is slightly larger than the current EDC-D10A. Will it also be mounted with the long axis parallel with the wings? For planning, can I assume 20% larger fall within the slightly larger reference?
3. The previous post stated the wiring to run and the connection would be a db9. Do you happen to have the pin out yet? I’d love to solder the connection standing up instead of on my back.

Thanks

 

[dynonsupport]

That would be a fine location for the EDC, so it should be fine for the next EDC/ADAHRS

The current design of the ADAHRS is 4.7" L (with flanges), 1.2" high, and 3" W. The data cable comes out the back and the pressure lines come out the front.

The data cable is a D9 that uses all 9 wires. It's wired straight through. pin 1 to pin 1, pin 2 to pin 2, etc.

 

[rogersmart]

Moving right along with construction of my RV8 which will some day have the NewGen. I have accepted that I will be flying before the NewGen is ready. Thanks for the info for planning the servo, ADAHRS and pitot. I have decided not to pre plan engine wiring for the NewGen.
I am coming to the panel quickly and will build the panel for flight before the NewGen comes out. The last piece of the puzzle is the size of the 10" display. Can you give final diminsions yet, overall, cutout and depth?
Also when the time comes, how could I become a beta tester and what are the requirements?

 

[dgatesii]

Next generation size

Think I have the same question as the last post.....
I already have a panel with a 100 and a 120.  Will the next generation fit in the same panel holes?

 

[dynonsupport]

Here are current drawings of the 7" and 10" units.

If you cut a panel with these dimensions, it's at your own risk. It's not going to change much, but there is a very slim chance a few mils may get added or deleted. Both products are about 2.2" deep, but it's likely the connectors will stick out deeper than that, event though they are sunk into the unit quite a bit.

The 7" products are BIGGER than current 7" products. This was necessary to support the knobs at the bottom of the screen and the much brighter screen.

7": http://dynonavionics.com/downloads/g2/Dynon Avionics 7 Inch Display Customer Drawing Rev B.pdf

10": http://dynonavionics.com/downloads/g2/Dynon Avionics 10 Inch Display Customer Drawing Rev B.pdf