Today's Message Index:
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1. 12:06 AM - Z-12N based architecture review request (stuart anderson)
2. 06:36 AM - Shorts & Blown Fuse (user9253)
3. 01:27 PM - Re: Shorts & Blown Fuse (user9253)
4. 02:11 PM - Re: Re: Shorts & Blown Fuse (Matthew S. Whiting)
5. 03:16 PM - Re: Z-12N based architecture review request (user9253)
6. 05:07 PM - Re: Z-12N based architecture review request (esco)
Message 1
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| Subject: | Z-12N based architecture review request |
Team: I=99d appreciate a review of my first draft architecture, base
d on
Z-12N. Any credit goes to Mr. Nuckolls and many contributors; any errors
are mine.
Aircraft: Vans RV-14A
Mission: IFR cross-country
Engine: electrically dependent (SDS EFI/I) IO-390.
Electric Power:
-main: B&C 60a externally regulated alternator
-backup: Monkworkz MZ30L 30a externally regulated generator
-battery: EarthX ETX900, approx 50 min power for engine bus only (18.6ah @
1c rate.)
Electric Load Analysis:
-Engine bus: <14a for SDS dual ECU, coils, injectors, fuel pumps...
-Main bus estimates: <35a max draw (avionics, flap motor, fans, lights...);
<8a steady state; still working the "minimum essential avionics" estimate
I have considered Z-13, Z-14, and Z-101; 12N seems the best fit for my
mission, skills, and planned equipment.
thank you
Message 2
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| Subject: | Shorts & Blown Fuse |
Hello Joe, hello Bob.
Apologies for e-mailing you both off forum but I have difficulties when trying
to post to the AeroElectric forum.
I'd like to ask a couple of questions and if it is possible, could I ask you to
also post this request to the forum please.
General question; what are the events that will actually cause a fuse to blow?
Also, the word "short" is mentioned together with blown fuses, but what exactly
is meant by a short in our amateur-built aircraft?
I have yet to find a really good source for advice on fault-finding. If you know
of one, I'd appreciate hearing of it please.
Specifically I have a nav/com unit that has blown the fuse of its nav board.
The unit has separate power supplies for nav and com and also for light dimming
capability.
This nav/com is connected to a cdi that has its own separate power supply and again
a supply for light dimming.
In the past the cdi vertical needle fluctuated, after having been steady, and if
I remember
correctly shortly afterwards the nav/com display showed nav receiver and gs receiver
failure.
It was on checking that I found the nav board power supply 5amp fuse had blown.
I have replaced it and the fault messages have disappeared and the cdi needle is
currently steady.
But I am concerned that the fuse may blow again.
If it doesn't, the issue that caused it to blow in the first place may
damage the nav side of the unit with ensuing expensive repair charges!
So you can see that I am trying to fault-find and hence my initial general questions.
Any direction/guidance/information you and the forum can provide will be extremely
helpful, thanking you both in advance.
With kind regards
Patrick Elliott, Surrey, England
Long-EZ, G-LGEZ
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513146#513146
Message 3
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| Subject: | Re: Shorts & Blown Fuse |
This is the link that I use for the AeroElectric List:
http://forums.matronics.com/viewforum.php?f=3
-
Fuses can blow from old age or vibration, excessive ambient temperature,
excessive current, or a loose fuse holder which makes heat. Glass fuses such
as AGC are prone to fail due to the long element and due to poor fuse holder
spring tension. Make sure that fuses are held firmly with lots of spring tension.
-
A short circuit is an unintended current path which is usually shorter than the
intended current path. A wire that vibrates against a sharp metal can result
in a short circuit when the insulation is worn away and the copper wire
contacts the aluminum airframe.
-
It is not clear from Patrick's description where the problem fuse is located.
Is the fuse part of the aircraft electrical system or is the fuse located within
the navigation power supply? If the blown fuse is contained within avionics,
there is not much that the average person can do except replace it, making
sure it is held in place with lots of spring tension. A fuse holder with weak
springs will result in a poor electrical connection that has resistance. Current
flowing through resistance makes heat which can cause the fuse to blow. A
poor electrical connection can also cause intermittent failures.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513147#513147
Message 4
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| Subject: | Re: Shorts & Blown Fuse |
Fuses failing from old age is a thing of the past, unless you uses fuses fro
m the past. Modern auto blade fuses will likely outlast your airplane if use
s within their specifications. https://www.eaton.com/us/en-us/support/eaton
-answers/what-is-fuse-fatigue.html
Matt
Sent from my iPad
> On Jan 26, 2024, at 4:29=AFPM, user9253 <fransew@gmail.com> wrote:
>
l.com>
>
> This is the link that I use for the AeroElectric List:
> http://forums.matronics.com/viewforum.php?f=3
> -
> Fuses can blow from old age or vibration, excessive ambient temperature,
> excessive current, or a loose fuse holder which makes heat. Glass fuses s
uch
> as AGC are prone to fail due to the long element and due to poor fuse hold
er
> spring tension. Make sure that fuses are held firmly with lots of spring t
ension.
> -
> A short circuit is an unintended current path which is usually shorter tha
n the
> intended current path. A wire that vibrates against a sharp metal can res
ult
> in a short circuit when the insulation is worn away and the copper wire
> contacts the aluminum airframe.
> -
> It is not clear from Patrick's description where the problem fuse is locat
ed.
> Is the fuse part of the aircraft electrical system or is the fuse located w
ithin
> the navigation power supply? If the blown fuse is contained within avioni
cs,
> there is not much that the average person can do except replace it, making
> sure it is held in place with lots of spring tension. A fuse holder with w
eak
> springs will result in a poor electrical connection that has resistance. C
urrent
> flowing through resistance makes heat which can cause the fuse to blow. A
> poor electrical connection can also cause intermittent failures.
>
> --------
> Joe Gores
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=513147#513147
>
>
>
>
>
>
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Message 5
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| Subject: | Re: Z-12N based architecture review request |
The Monkworkz MZ30L is NOT wired like most alternators. Read the installation
manual.
https://docs.google.com/document/d/1BckaSN06Lv4BYY07AfHk3YRvx8b60yybpX0qHB-Mymc/edit
Below is my interpretation of the owner's manual.
ALL of the wires from the MZ30L go to its regulator and no place else.
Not counting the wires between the generator and regulator, a minimum of 4
wires are required to be connected to the regulator. Regulator pins 1 & 6 go to
an enable switch. Regulator pins 17 & 18 go to the main power bus and ground
respectively. 10AWG wire could be used for pins 17 & 18. The fuselink would
then be 14AWG.
The other pins on the regulator are optional and are for an external indicator
light and signal outputs to a customer supplied ammeter.
The Monkworkz MZ30L is self current limiting. If overloaded, the output voltage
will automatically decrease to limit the current.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513149#513149
Message 6
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| Subject: | Re: Z-12N based architecture review request |
Joe: thank you very much for the review.
I've read the Monkworkz installation manual a few times, and I'm working out the
integration required. Bill Judge is very clear about the need to connect to
the switched side of battery contactor- that is one of the reasons I chose the
Z12 as a model.
As I learn and refine this, I'll add more details.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513151#513151
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