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11-19-2012, 03:36 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by krw5927
The Aeroelectric diagrams show the alternator output (B terminal) on the same side of the master contactor as the battery. Is there a reason you put it on the opposite side here?
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The "standard" Z-11 one shows otherwise... The Alternator B terminal goes to the link between the two contactors...
http://www.aeroelectric.com/PPS/Adob..._Pdfs/Z11M.pdf
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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11-19-2012, 05:40 PM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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Quote:
Originally Posted by RV6_flyer
Best aircraft practice is to have a separate voltage regulator and Over Voltage Protection.
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Thanks to Gil, I now have a diagram for the VR and the OVP. I'll add them into my design. |
11-19-2012, 06:02 PM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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There is nothing wrong with an alternator like the PP units with internal regulation and OV protection.
Many many many of em out there and working fine for years and years....
Yes there are documented failures...Show me an alternator setup without em!
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11-19-2012, 06:06 PM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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On the subject of internal VR andOVP, I'm going to have to plead Switzerland.
If we set aside the VR and OVP, how do I get the two buses correct ? Is thecright design to use the switches to drive relays? Is relays, can someone point me to a source ?
Guys, I'm really greatful for everything so far! Really !
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11-19-2012, 06:27 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,144
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Quote:
Originally Posted by humptybump
Guys, I'm really greatful for everything so far! Really !
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You can always send blank check to Stein to the rescue  |
11-19-2012, 06:35 PM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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Vlad's, that would cut in my boat gas fund. Besides, how would I learn anything?
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11-19-2012, 10:57 PM
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Join Date: Jul 2007
Location: Eugene, OR
Posts: 122
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Breaker sizes?
Looks good. Just a couple suggestions:
Consider breaker switches for Comm or an avionics switch so you can energize engine monitor and MFD at engine start but w/o avionics.
A breaker switch on the fuel pump would also make your panel simpler.
I don't know which radios you are using but my Icom transmits at over 8 amps which requires a 10A breaker and you only have 5A on each
Your MFD has only a 2A draw?? (My Dynon has 5A breaker...but does also power an integrated GPS)
Recommend increasing the 12V auxillary to 10A to cover all portable devices you might want to plug in. Most auto auxillary plugs are rated at least 120W.
And need breaker between B+ on Alt and wherever you tie into bus or battery (as others have mentioned).
Great drawing compared to my "back of the napkin"
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Alan
RV-9A N984AW
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11-20-2012, 04:53 AM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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Quote:
Originally Posted by AF_Alan
I don't know which radios you are using but my Icom transmits at over 8 amps which requires a 10A breaker and you only have 5A on each
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The radio is the MGL V10 - a solid state radio and only calls for 5A
Quote:
Originally Posted by AF_Alan
Your MFD has only a 2A draw?? (My Dynon has 5A breaker...but does also power an integrated GPS)
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The EFIS is the MGL Xtreme. The MFD is "future". I was guessing. I can increase that to a 5A.
Quote:
Originally Posted by AF_Alan
Recommend increasing the 12V auxillary to 10A to cover all portable devices you might want to plug in. Most auto auxillary plugs are rated at least 120W.
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The circuit is for a pair of cigarette lighter plugs. I only plug things like an iPhone or other portable devices. However, if I plugged in a Gerber, you are right. I'll rework that circuit.
Quote:
Originally Posted by AF_Alan
And need breaker between B+ on Alt and wherever you tie into bus or battery (as others have mentioned).
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This error was pointed out above so a CB is an easy fix. However, the down stream buses are an even bigger error so the placement and sizing of these breakers (and possible relays) are my next challenge. Ugh.
Quote:
Originally Posted by AF_Alan
Great drawing compared to my "back of the napkin"
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I'm using the free software, ExpressPCB. It's pretty good. It would be even better if those of us here on VAF using it were to band together and share our component libraries. You don't need too many components and we all are using most of the same components.
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11-20-2012, 09:26 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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Quote:
Originally Posted by az_gila
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Yep, that's what I get for not printing out the whole thing and just looking at part of the diagram on my computer monitor. You're right Gil. As always 
__________________
Kurt W.
RV9A
FLYING!!!
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11-20-2012, 07:09 PM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by AF_Alan
Looks good. Just a couple suggestions:
Your MFD has only a 2A draw?? (My Dynon has 5A breaker...but does also power an integrated GPS)"
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The Xtreme only requires a 1 amp slow blow fuse. And it also powers an internal GPS............
__________________
VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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