EMS D10 Installation Questions

[Whocares]

Am close but have some last questions:
1. I have a composite panel. Got the 14g wire to ground the case but I'm told that anodizing isn't good for grounding and the case is anodized? Where to attach wire - maybe a mounting screw?

2. What do I gain from connecting to GPS? My D10 EFIS already is.

3. Where does the yellow wire (pin 2) connect to?

4. Am not clear on what to do with pins 11, 12 and 30 to connect to my laptop.

5. Which of the three is the most common way to install the Ammeter Shunt?

Thank you!

 

[Dynon]

1) The mounting screws are grounded. If you have a grounding problem, though (this most often shows up in oil temperature), a single 14g wire between the device and ground may not be enough to fully eliminate voltage potential between the display, the sensor, and the rest of the electrical system.

2) If they're connected via DSAB, the GPS position will be available to the EMS as well. it gets you information like mpg and range if you have the fuel flow sensor installed.

3) If you wire this to the aircraft battery it can keep time running while the unit is off. If you have GPS connected, though, it will set the time every time you first power up and get a GPS lock. So you don't really need to connect it in your case.

4) They should already be terminated into a 9 pin connector. That 9 pin connector would be used for software updates ,should we ever come out with one (none are currently planned)

5) Can't say for sure. Position A is the traditional Cessna ammeter. B measures alternator output, while C is a "load meter".

 

[Whocares]

Thank you!

Would it be a good idea to do something better to ground the oil temp while I'm at it?  I've always had issues with oil temp and would like to eliminate it.  The battery is in the nose, near the instrument and the engine is in the rear.

Also I have a grounding block on the firewall (again, in the rear).  Should it be tied to the engine or the grounding block in the nose where most everything goes or both?  Or neither and just used as a local terminal for grounds that come and go to the nose and instrument?

Last question; if I connect the GPS can I splice into the feed from the GPS to my D10 EFIS?

Thanks again.  I'll be out of your hair soon!!

 

[Dynon]

On GPS - you only need to bring it into one of the two devices EFIS or EMS devices, and if they're communicating via DSAB, it will make it to both. I thought that in your initial post you were saying that you already had GPS connected to your EFIS, but maybe I misread that? If it's already coming into your EFIS, after you connect the EFIS and EMS via DSAB, the GPS information will flow between them.

 

[Dynon]

On grounding, the generic answer is that any voltage between grounds can cause issues, and the oil temperature sensor in particular is susceptible to even very small voltage differences. And ground paths through wires or structures that drop voltage can be a challenge in aircraft like yours that have the battery and avionics separate from the engine, its sensors, and its power generation devices. So the short answer to your question is "both" - all the ground points need to not have voltage between them.