Just rec'd my SV yesterday ;D I have been reading the install manual for the last few days, weeks getting ready. My first question...there will be many... I have dual PMags, the pmag instrux say to only connect one tach reading to the EFIS, but the SV EMS pin out gives to places PIN 32 and 33. I was wondering as to how others have connected these, one or both...
dual pmag conection to SV EMS.from newest SV owner
- Thread starter rlallen1
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- Mar 23, 2005
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You can hook up both. Some EFISes can only take one tach signal, which may be the origin of the advice. Also, if the tach signal doesn't go away, even when the pmag isn't providing spark during mag check, then that would be another reason that only one would be strictly necessary except if that singly connected unit failed.
The main reason we have two inputs is that in a conventional mag setup, each mag goes away completely, as far as the EMS can see, when you do your mag check. So having two inputs lets Dynon systems automatically look at the other one to maintain a tach reading.
The main reason we have two inputs is that in a conventional mag setup, each mag goes away completely, as far as the EMS can see, when you do your mag check. So having two inputs lets Dynon systems automatically look at the other one to maintain a tach reading.
mmarien
Murray M.
I have dual P-Mags and have both connected. As mentioned above, the signal doesn't go away when you ground it out (mag check) but having both connected allows some redundancy. While you asking, be sure to mention it would be nice to be able to display the firing angle on Skyview.
Did you connect the 20 gauge ground wire from the EMS D37 directly to the Pmag Pin1. Reason I ask is the Pmag instructs say to use 18 gauge ground, but the dynon ems is 20 gauge ground...wasn't sure if it mattered or not but wanted to find out before I proceeded.
Gotcha... if you take a second ground to the EIFS for a tach reference it would only need to be 22 gauge similar to the tach signal line. I doubt that the reference ground is actually actually needed since your EFIS is likely getting its ground from a block on the firewall with a direct hard connection to the engine case and battery.
mmarien
Murray M.
I don't have the GND wire to the EFIS and don't have any signal problems with the tach output. This is new since my manual LC114v13. Grounding is the most important connection so if there were problems with the tach signal the extra ground wouldn't hurt.
I did add a serial connection to pins 2 and 3 to connect to a computer running EICAD. They ask for shielded wire and a ground. See here:
http://www.emagair.com/EICADII.htm
This is the connection I was hinting would be nice to have on Skyview rather than having to carry a laptop or purchase the EI Commander.
I did add a serial connection to pins 2 and 3 to connect to a computer running EICAD. They ask for shielded wire and a ground. See here:
http://www.emagair.com/EICADII.htm
This is the connection I was hinting would be nice to have on Skyview rather than having to carry a laptop or purchase the EI Commander.