Today's Message Index:
----------------------
1. 02:58 AM - Re: Making your own fuseable links (JOHN TIPTON)
2. 03:46 AM - Re: CROWBARS? (bob noffs)
3. 05:50 AM - Re: CROWBARS? (Robert L. Nuckolls, III)
4. 05:55 AM - Re: Re: Making your own fuseable links (Robert L. Nuckolls, III)
5. 08:32 AM - Re: Z-* Question (jonlaury)
6. 10:47 AM - Non Aviation electrical conponent question (Mike Nellis)
7. 10:49 AM - Re: Making your own fuseable links (JOHN TIPTON)
8. 11:02 AM - Re: Re: Z-* Question (Charles Plumery)
9. 11:52 AM - Re: Non Aviation electrical conponent question (user9253)
10. 12:06 PM - Re: Non Aviation electrical conponent question (user9253)
11. 12:20 PM - Re: Making your own fuseable links (user9253)
12. 02:53 PM - Re: Re: Non Aviation electrical conponent question (Mike Nellis)
Message 1
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| Subject: | Re: Making your own fuseable links |
Hi Bob
Your answer relates to the Z11 wiring we are using: specifically the Endurance
Bus feed, the diagram shows a live feed to a Fuse Block (Main Battery Bus), then
a 7 amp fuse to the Endurance Buss switch, then to to Endurance Bus.
We are doing without the the main Battery Bus as not required, now this leaves
us without the 7 amp protection, so I was going to put a 'fusible link' at the
Battery Contactor - incidently we are using 14AWG (because we have it, we do
not have any 16AWG).
I need to make up a 18AWG fusible Link
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481597#481597
Message 2
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well, i guess i should wire in a crowbar. seems like it should be pretty
straight forward to have it break the circuit to the field. i will take a
look in bob's book for ideas and go from there.
thanks everyone for the advice.
bob noffs
On Wed, Jul 11, 2018 at 10:54 PM, James Kale <jimkale@roadrunner.com> wrote
:
> jimkale@roadrunner.com>
>
> Different alternators have different failure mode. I recently saw a
> friend=99s Cessna 172 after it suffered some sort of over voltage c
ondition.
> If. I had not seen it, I would not have believed the damage. Every
> electrical component was fried. The insulation on every wire was burned
.
> I did not know an alternator was capable of that sort of damage. I do kn
ow
> a crowbar would have Prevented it though. Like I said, if I had not
> personally seen the damage I would not have believed how bad it was. Eve
ry
> wire and electrical component in the airplane had to be replaced. It is
> possible that not all alternators are capable of that sort of failure
> mode. But it sure opened my eyes and I would not want to have been on
> board when it occurred. Jim Kale, Enterprise, AL
>
> Sent from my iPhone
>
> > On Jul 11, 2018, at 10:45 AM, Charlie England <ceengland7@gmail.com>
> wrote:
> >
> ceengland7@gmail.com>
> >
> >> On 7/11/2018 6:42 AM, bobnoffs wrote:
> >>
> >> hi all,
> >> in the past a crowbar would stop the current from an overvoltage
> source quick enough to prevent avionics damage.
> >> is that really needed any more?
> >> i have a honda [viking] engine with auto accessories. i don't hear of
> cars blowing out their glass dashboards.
> >> when i asked b and c about a 'crowbar' they said theirs was only
> recommended for a permanent magnet alternator.
> >> what are others doing with auto alternators?
> >> thanks
> >> bob noffs
> >>
> > I think their answer was framed in the assumption that you're using onl
y
> their products. The B&C regulators for conventional alternators have
> overvoltage protection built into them.
> >
> > I've read 'rumors on the interwebs' that the latest auto tech often
> builds voltage regulation into the vehicle's system computer, that contro
ls
> virtually everything else in the vehicle, too. Not a big deal to build in
> overvoltage protection too, in that environment. It's unlikely that the
> Viking is using the stock auto controller (pray that it doesn't; too many
> 'protections' in auto controllers that can kill you in an a/c).
> >
> > I've run my dirt-simple RV-4 without OV protection for a long time, but
> with expensive avionics in the -7 I'm building, I *will* have OV protecti
on.
> >
> > Charlie
> >
> > ---
> > This email has been checked for viruses by Avast antivirus software.
> > https://www.avast.com/antivirus
> >
> >
> >
> >
>
>
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>
>
Message 3
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At 05:45 AM 7/12/2018, you wrote:
>well, i guess i should wire in a crowbar. seems like it should be
>pretty straight forward to have it break the circuit to the field. i
>will take a look in bob's book for ideas and go from there.
The crowbar ov protection module can be added to
any system wherein alternator field power is
taken through a typical 5A breaker. The
module is wired from field supply line to
ground at any point downstream of that
breaker. You can find examples in the Z-figures.
Bob . . .
Message 4
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| Subject: | Re: Making your own fuseable links |
At 04:58 AM 7/12/2018, you wrote:
><jmtipton@btopenworld.com>
>
>Hi Bob
>
>Your answer relates to the Z11 wiring we are using: specifically the
>Endurance Bus feed, the diagram shows a live feed to a Fuse Block
>(Main Battery Bus), then a 7 amp fuse to the Endurance Buss switch,
>then to to Endurance Bus.
>
>We are doing without the the main Battery Bus as not required, now
>this leaves us without the 7 amp protection, so I was going to put a
>'fusible link' at the Battery Contactor - incidently we are using
>14AWG (because we have it, we do not have any 16AWG).
>
>I need to make up a 18AWG fusible Link
I'd just move the 30A in-line alternate feed
fuseholder over to the battery, eliminate
the battery bus, mount the alternate feed
relay adjacent to the battery contactor.
Use the in-line fuseholder to 'jumper'
between the alternate feed relay and
battery contactor.
Bob . . .
Message 5
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| Subject: | Re: Z-* Question |
BMC_Dave wrote:
> It almost feels like I'm being intentionally gaslit, I'll try again. ... (snip)
For the etymologically curious:
"The original (meaning) stems from 1938 stage play Gas Light and the dimming of
the gas lights in the house that happened when the husband was using the gas
lights in the flat above while searching for the jewels belonging to a woman whom
he had murdered. The wife correctly notices the dimming lights and discusses
it with her husband, but he insists that she merely imagined a change in the
level of illumination."
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481608#481608
Message 6
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| Subject: | Non Aviation electrical conponent question |
I'm working on a commercial microwave oven in one of my restaurants. One
of the fuses blows when the start button is depressed. There are 2
magnetron tubes, one fan and 2 capacitors and 2 diodes.
I still have more troubleshooting to do but i was curious if someone could
tell me the purpose of the diodes in the picture. Both diodes are checking
bad on my Greenlee Meter (model DM-60).
https://photos.app.goo.gl/JKPdZ5u1VStbfrdk8
On Thu, Jul 12, 2018, 10:34 jonlaury <jonlaury@impulse.net> wrote:
>
>
> BMC_Dave wrote:
> > It almost feels like I'm being intentionally gaslit, I'll try again. ...
> (snip)
>
>
> For the etymologically curious:
>
> "The original (meaning) stems from 1938 stage play Gas Light and the
> dimming of the gas lights in the house that happened when the husband was
> using the gas lights in the flat above while searching for the jewels
> belonging to a woman whom he had murdered. The wife correctly notices the
> dimming lights and discusses it with her husband, but he insists that she
> merely imagined a change in the level of illumination."
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481608#481608
>
>
Message 7
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| Subject: | Re: Making your own fuseable links |
Hi Bob
It's obvious that I do not have the latest version of Z11 (mine being rev:M) as
the drawing does not include any '30A in-line alternate feed
fuseholder' or the 'alternate feed relay' which you mention.
What 'revision' are we on now and can you give me a link please
Regards: John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481610#481610
Message 8
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| Subject: | Re: Z-* Question |
Charles Boyer and ?
Sent from my iPad
> On Jul 12, 2018, at 11:39 AM, jonlaury <jonlaury@impulse.net> wrote:
>
>
>
> BMC_Dave wrote:
>> It almost feels like I'm being intentionally gaslit, I'll try again. ... (snip)
>
>
> For the etymologically curious:
>
> "The original (meaning) stems from 1938 stage play Gas Light and the dimming
of the gas lights in the house that happened when the husband was using the gas
lights in the flat above while searching for the jewels belonging to a woman
whom he had murdered. The wife correctly notices the dimming lights and discusses
it with her husband, but he insists that she merely imagined a change in
the level of illumination."
>
>
>
>
> Read this topic online here:
>
> https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.matronics.com%2Fviewtopic.php%3Fp%3D481608%23481608&data=02%7C01%7C%7Cc8f107a61dfc4cacec1608d5e80db1de%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636670067865728097&sdata=g3E%2BbEL8ywC8tvRTOM1NaSlCrQ3qahsT0hWFxabZ260%3D&reserved=0
>
>
>
>
>
>
>
>
>
Message 9
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| Subject: | Re: Non Aviation electrical conponent question |
I did a google search for "microwave diode purpose" without quotes. The diode
(rectifier) and the capacitor function together to effectively double the already-high
voltage. This is called a voltage-doubler circuit.
The google search results have links to testing diodes.
Since your microwave has two identical circuits, you could switch parts between
the two circuits to determine which is bad.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481613#481613
Message 10
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| Subject: | Re: Non Aviation electrical conponent question |
This Youtube video says that microwave high voltage diodes can not be checked the
normal way. The video shows how to do it using a 9 volt battery and meter.
https://www.youtube.com/watch?vlrKf2PdVA
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481614#481614
Message 11
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| Subject: | Re: Making your own fuseable links |
Here is a link to Bob's electrical drawings.
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481615#481615
Message 12
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| Subject: | Re: Non Aviation electrical conponent question |
Thank you Joe, that was helpful. Both diodes tested vood so ill keep on
checking on why one of the 15a fuses to one of the HV power aupplies keeps
blowing.
Mike
On Thu, Jul 12, 2018, 14:08 user9253 <fransew@gmail.com> wrote:
>
> This Youtube video says that microwave high voltage diodes can not be
> checked the normal way. The video shows how to do it using a 9 volt
> battery and meter.
> https://www.youtube.com/watch?vlrKf2PdVA
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=481614#481614
>
>
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