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peterthomson
Joined: 18 Jul 2010
Posts: 41
Location: Thailand
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 Posted: Fri Nov 12, 2010 5:18 am Post subject: Dynon D180 tachometer on Jabiru 3300 reading low |
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My friend had thought he lost RPM on the engine, butr in fact, it was
only on the Dynon D170 reading.
A TinyTach showed normal readings, where the Dynon showed a few
hundred RPM less, and even decreased while the engine RPM were stable.
The take-off is from the alternator, 6 pulses per RPM.
Has anyone else seen this problem with the Dynon ?
thanks
Peter
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andysilvester
Joined: 03 Nov 2010
Posts: 5
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| Posted: Fri Nov 12, 2010 5:48 am Post subject: Re: Dynon D180 tachometer on Jabiru 3300 reading low |
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Peter,
Try swapping the Dynon's rpm sense wire to the other alternator output wire. It shouldn't make a difference, but I've found it does on the EIS. Otherwise, just check wiring, configuration and grounds. We've not had any such issues with the Dynon EMS D120; a similar instrument. The D120 can have two rpm inputs (left and right) to suit Lycomings, but just use the 'left' input and don't connect the 'right'.
Cheers, Andy
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aprazer
Joined: 24 Nov 2006
Posts: 93
Location: Boise, Idaho
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| Posted: Sun Nov 14, 2010 1:01 pm Post subject: Re: Dynon D180 tachometer on Jabiru 3300 reading low |
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I had a similar problem. Go back and verify your wiring to the Dynon with the wiring schematic. I had two wires doing the job of one.
Mack
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