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Achille
Joined: 12 Jun 2017
Posts: 25
Location: Europe
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 Posted: Sun Jul 02, 2017 6:28 am Post subject: Ground wiring and hours meter/RPM |
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Hello all,
I have another question about my wiring diagram just before to begin on the plane. (4 questions) :
1) I followed the Z19R diagram, but my auxiliary battery is a small 7ah. (Main 18ah) Both battery on the nose of my canard aircraft. So I have to wire it via the main bus like another accessory ? (I don't remember were I read that)
Do I have to connect the "-" of the auxiliary battery to the Ground bus of the main battery ?
If yes, I am then note sure how to wire grounds of my aux. bat bus.
I set only fuel pump 2 and IGN 2 on this bus battery (to handle the worst situation, because on the main bus powered by the main battery I have an essential bus with Pump 1 and IGN1). But in this case I'm not sure how to wire the ground of this aux. bat bus.
I think a lot about this ground question because friend of mine loose his engine in flight du to fuel pump ground broke down (the both main an aux. pump ground) in a E-racer. And therefore, I would like a 2 dependent system, just joined for the aux. bat charge that it seems to be the case on the Z19R
I set a quick drawing done for this post quickly. (it's not my wiring diagram)
2) When I read the ground Z15.3.1, I see that oil pressure sensor (same for CHT/EGT/oil T°) will be grounded on the engine, and for the gauge, I have to wire the ground of the gauge on the engine ? (not on the panel or firewall ground bus,so in this case for a canard I have to run a wire thought the plane just to wire the gauge to the engine ? ).
3)I don't find how to wire a counter of engine hours. Previously it was wired with bat. master switch, which is a bad solution for engine count hours. (I would not like to add a oil pressure switch)
4)My RPM gauge have to be wired from an electronic ignition, I have to set shielded wire ? and breaker on this line ?
Thank you and sorry for this kind of question it's not my favorite speciality electricity. 
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user9253
Joined: 28 Mar 2008
Posts: 1922
Location: Riley TWP Michigan
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| Posted: Sun Jul 02, 2017 11:09 am Post subject: Re: Ground wiring and hours meter/RPM |
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The 30 amp relay should be disabled during engine cranking to prevent cranking current from overloading the aux circuit.
The aux battery could be grounded at the same location as the main battery.
All grounds, including engine block, need to be electrically connected together, preferably at the same physical location.
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