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Thread: 5V or 12V expected for RPM pulse from magneto?

  1. #1
    Junior Member
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    5V or 12V expected for RPM pulse from magneto?

    Good morning AFS people!
    I have a Lycoming IO-390, dual Slick mags, and an AFS 5600. I am planning to replace the magnetos with two E-Mag electronic ignitions.
    My AFS-5600 currently gets its RPM data from the right mag (red, black, and white wires connected to the side of the mag housing, presumably to some kind of Hall effect sensor).
    The new E-mags can also supply an RPM signal, using the same white wire. The E-mags can be configured to provide this tach pulse at either 12V or 5V.
    Question: what voltage is the AFS-5600 expecting from the magneto tach pulse, 12V or 5V?
    Also: are there any known issues related to my EFIS when converting from Slick mags to E-Mags?
    Thanks,
    Bob
    Last edited by lisbonne; 02-20-2020 at 12:17 PM.

  2. #2
    Advanced Flight Systems Shawn McGinnis's Avatar
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    Sep 2012
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    Canby, OR
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    Pin 32 is the RPM Sensor Input which is expecting 0-5V. Pin 33 is Electronic RPM Input for 0-12V.
    Page 142 of AF-5000 Install Manual V15.1

    You will need to change Pulses Per 2 Revolutions to reflect Electronic Ignition 4 Cylinders: Pulses = 4
    Page 179 of AF-5000 Install Manual V15.1
    Shawn McGinnis

    Advanced Flight Systems
    support@advanced-flight-systems.com

  3. #3
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    Changing Pulses Per 2 Revolutions from 2 to 4 worked. Thanks Shawn!

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