AeroElectric-List Digest Archive

Mon 11/20/17


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 01:21 PM - Re: voltage fluctuations (erich weaver)
     2. 03:24 PM - Re: voltage fluctuations (user9253)
     3. 04:19 PM - EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= Slump =?ISO-8859-1?Q?Eliminator=9D? (Eric Page)
 
 
 


Message 1


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    Time: 01:21:30 PM PST US
    Subject: Re: voltage fluctuations
    From: "erich weaver" <erich.weaver@aecom.com>
    I was able to work on this last weekend and found that there was indeed some voltage loss between main bus and master switch. Got that taken care of, got rid of the jumper between pins 3 and 6 on voltage regulator and added a dedicated bus voltage sense wire, and then monitored voltage at a number of locations with the engine running using my trusty Radio Shack multimeter: 14.08 V at battery; 14.06 at battery bus, 14.05 at main bus, and 13.31 at e-bus that is fed through a diode. With the e-bus alternate feed switch turned on, e-bus voltage jumps to 13.96. Voltage readings are now steady at the battery and bus locations. EIS and two EFIS screen voltage values are only indicated in tenths of volts on the screens, and these values seem to fluctuate by 0.1 or 0.2 V; not sure why that is, but perhaps that isnt really a concern. EIS (fed from e-bus) = 13.5 V pilot EFIS, primary power source (fed from e-bus) 13.4 V pilot EFIS, secondary power source (fed from main bus & TCW power stabilizer =13.8 V. So looks like my intended secondary power source for covering engine-start brown-outs is actually serving as my primary power source due to its higher voltage. Copilot EFIS, primary power source (fed from e-bus) = 13.2 V (a bit low) There is no secondary power source connected for the copilot EFIS. So, all good overall, although thinking I should adjust the voltage regulator until I get 14.2 V at the battery so that it recharges a bit faster. Thanks for the assistance guys. Erich Read this topic online here: http://forums.matronics.com/viewtopic.php?p=475332#475332


    Message 2


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    Time: 03:24:25 PM PST US
    Subject: Re: voltage fluctuations
    From: "user9253" <fransew@gmail.com>
    Good going Erich. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=475342#475342


    Message 3


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    Time: 04:19:13 PM PST US
    Subject: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?=
    Slump =?ISO-8859-1?Q?Eliminator=9D?
    From: "Eric Page" <edpav8r@yahoo.com>
    Im starting a new thread on this topic in case anyone who might be interested missed the recent discussion, here: http://forum.matronics.com/viewtopic.php?t=16768062 To recap, Ive adapted Eric Jones design for a voltage slump eliminator (a device to prevent EFIS/EMS brownout/reboot during engine start) and designed a circuit board for it. The schematic (.PDF) is here: http://forum.matronics.com/download.php?id=44878 An archive (.ZIP) containing the full design files can be downloaded here: https://preview.tinyurl.com/yajod9m6 So far one member of the forum has expressed a desire for me to build one of these for him, so Ive ordered a batch of circuit boards. If anyone else wants a complete unit, please let me know so I can order all of the components at once. You can reply to this thread or contact me directly. The cost should be about $35 each, plus postage to your address. Ill send a PayPal invoice, along with copies of my receipts, once I know the exact amount for each device and I have them ready to mail. Im happy to part with bare circuit boards as well; again, for my cost ($0.55/ea) plus postage. Eric P.S. For anyone seeing this in the future, you can contact me directly to see if I have any circuit boards on hand. The PDF schematic file contains a link to Digi-Key that will load a shopping cart with all necessary components. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=475344#475344




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