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1. 03:53 AM - Re: Primary Power Diagram RV-14 (Mudfly)
2. 04:37 PM - Re: Primary Power Diagram RV-14 (user9253)
Message 1
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| Subject: | Re: Primary Power Diagram RV-14 |
I'm finally getting around to actually running wires for my primary power system.
In the process, I discovered something that I missed earlier and
would like some second opinions before I make any changes. Through all my previous
primary power system revisions I included a diode between
the Main Power Bus and the Avionics/Essential Bus. As I was running
wires for this diode it occurred to me the diode may not be required. My reasoning:
The avionics relay is normally open. When the Batt/Off/Esntl switch is
placed to Esntl, power is removed from the Avionics Bus relay
and it should open. This should prevent current flow from the Avionics/Essential
Bus that is now being fed from the Stby Alt, or the battery, through the
Essential bus relay. One "non-std" configuration I
did consider would be the Batt/Off/Esntl switch placed to the Esntl
position but the Pri Alt/Stby Alt switch was left in the Pri Alt position.
IF, the Pri Alt is still operating, the Main Pwr Bus and the Esntl Bus would continue
to be fed by the Pri Alt. However, The batt contactor is now
open due to the due to the Batt/Off/Esntl switch in the Esntl position. In this
scenerio, both the Avionics bus realy and the Esntl bus relay are
closed at the same time (non-std). The battery is now getting charge power "backwards"
through the Esntl bus relay . Now that I think about
it, that scenario would also occur with a diode in place.
Anyway, anything else I may need to consider before I remove the
diode?
The attached power digram shows the diode in question circled in red.
Thanks for your inputs.
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513526#513526
Attachments:
http://forums.matronics.com//files/pri_pwr_337.pdf
Message 2
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| Subject: | Re: Primary Power Diagram RV-14 |
The simpler the electrical system is, the more reliable it will be.
Fewer switches and relays results in less components to fail.
In an emergency, the pilot's mind will go blank and he won't remember what switches
do what.
Without the diode, the relays could feed power to the main power bus and
even to the starter if switches are in the wrong position.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513530#513530
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