Electoair system

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Bobcola1

New Member
Joined
Oct 18, 2019
Messages
2
Need help from the community!!! I have had a Dynon system for the past couple of years. This years upgrade is the electroair EFI. We are having difficulty with the tachometer. I am being told by the shop that the tach will only operate from the EFI but not the mag. I loose all tack input during the mag check. The shop has been in contact with Dynon. Any ideas??
 
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Kevin D

New Member
Joined
Jul 9, 2019
Messages
19
Yes, the system should accept both types of inputs. The EFI and and the mag pulse.
See page 7-46 of the Installation Manual Rev AM.
I have the Electroair Experimental Electronic Ignition and one mag.
 
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greentips

Member
Joined
Nov 26, 2020
Messages
31
Kevin D said:
Yes, the system should accept both types of inputs. The EFI and and the mag pulse.
See page 7-46 of the Installation Manual Rev AM.
I have the Electroair Experimental Electronic Ignition and one mag.
Click to expand...
Kevin,
Helpful info. I have just installed the EA on my C182, single mag version, but have not yet run it. Which installation manual?
The Skyview HDX is next. I'm running a CGR30 for engine instrumentation and will replace that with the Skyview HDX installation which is in process now.

The EA installation manual describes the tach output: Black wire off connector C1 pin 8 @ A/C system voltage, in my case 12V, 3 square wave pulses per revolution. IM-EIS-61000 Rev 16, p 33 of 43.

The Dynon Skyview HDX IM Rev M §12.2.9 p. 134 describes the tach connector for the EMS-220. table 20:
Pin 32 wht/grn Std RPM input Left 10+ volts
Pin 33 wht/blu Std RPM input Right 10+ volts
Pin 34 Blu Low voltage RPM input Left (<12 V)
Pin 35 Grn Low voltage RPM input Right (< 12 V)

Dynon says you can connect different signals to the 2 RPM inputs (p-lead to Std-L and 12 V transducer to Std-R for example) and the skyview will display rpm from either whichever the Skyview notices first. If the source is lost, it should grab the remaining signal if a signal disappears as in during a mag check.

12.2.9.2 describes the p-lead pickup. I had to install resistors on the CGR30 to keep one mag talking to it, but I don't know the technical details on how EI does this v. Dynon. Dynon recommends 30 kOhm resistors for P-lead pulse pickup.

Then you have to configure the EMS220 using the setup menu EIS Wizard, SETUP > HARDWARE> EMS CALIBRATION > TACH CALIBRATION which allows you to set the pulses/rev for counting RPM.

I expect to be testing this setup in about 2 weeks or so.
 
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