Today's Message Index:
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1. 08:14 AM - Re: ATO vs ATC fuses (Robert L. Nuckolls, III)
2. 08:14 AM - Re: Re: Alternator stops working at low idle RPM (Robert L. Nuckolls, III)
3. 08:16 AM - Re: Re: Next generation wig-wag controller for LED lamps (Robert L. Nuckolls, III)
4. 10:14 AM - Re: Switch ratings? (David Saylor)
5. 10:16 AM - Re: Alternator stops working at low idle RPM (Argonaut36)
6. 11:22 AM - Re: Switch ratings? (Robert L. Nuckolls, III)
7. 02:03 PM - Re: Switch ratings? (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: ATO vs ATC fuses |
At 12:32 AM 12/16/2019, you wrote:
>Actually Bob Z-15 was what I was thinking of.
>Each of those fuse blocks has 12 fused power and
>12 ground terminals. One block would be the
>endurance bus / avionics ground bus and the
>other block would be the main bus / panel ground
>bus. Although doing it that way I would connect
>the two ground busses with a braided cable
>instead of the 5x20awg on the diagram. Why does
>Z-15 have 5x20awg instead of a bonding strap?
The avionics ground is up on the panel adjacent to
the radios and other electro-whizzies.
http://aeroelectric.com/Pictures/Grounding/AGB_V.jpg
http://aeroelectric.com/Pictures/Grounding/AVG_RA.jpg
since is built up of crimp-on, 20AWG pins, the 5-wire
bundle seems a whole lot cleaner than trying to grab
onto it with anything else. But one could solder a
braided strap to the back-side . . . either works
good and lasts a long time.
>In any case, if I do rewire the plane I think
>I'll stick to the fuse=C2 blocks with tabs instead of screws
Recommend THREADED TERMINATIONS be avoided
as much as possible. Robustness of small
threaded fasteners are a pain-n-the-uknow-what
to assemble and process sensitive for
longevity and they drive up parts count.
The fast-on is simple, elegant and has an
excellent service record.
> . . . (none of my avionics would need a separate ground bus . . .
The idea behind the avionics ground is to provide
a LOCAL ground for all panel mounted electro-whizzies
service by a single, robust jumper to airframe system
grounds on firewall.
Bob . . .
Message 2
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| Subject: | Re: Alternator stops working at low idle RPM |
> Two bad alternators is possible, but not very likely. This leaves
> the voltage regulator and the wiring.
agreed . . . and 95% probability its the regulator
Bob . . .
Message 3
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| Subject: | Re: Next generation wig-wag controller for LED |
lamps
At 09:48 PM 12/15/2019, you wrote:
>
>oh,it is a good idea.Good ideas are just for everyone to share.
>
>--------------------------------------------------------------------
>
>My stepper motor website:skysmotor.com (https://www.skysmotor.com/)
>- Machinery Design ? - ? Stepper Moter Development
>
>"Necessity is the mother of invention." - Author unknown.
INTERLOPER . . . IGNORE
Bob . . .
Message 4
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| Subject: | Re: Switch ratings? |
On Sat, Dec 14, 2019 at 19:39 Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 11:19 PM 12/13/2019, you wrote:
>
> Are switch=C3=82 ratings related to power?=C3=82 I'm wondering if I can
assume that
> a 12A/28VDC rating would be equivalent to a 24A/12VDC rating.=C3=82 The
=C3=82
> switch=C3=82 I'm interested in is rated at 125VAC and 28VDC but not 14V.
=C3=82 Is
> 24A a safe assumption at 14V?=C3=82 Or is there more to it?=C3=82 This
is the
> switch:=C3=82 =C3=82 https://www.mcmaster.com/7337k98
>
> --Dave
>
>
> >>but why this one? It's rather expensive.
>
I want the locking feature, and to match some existing hardware.
If I bus two poles together can I assume each works half as hard? Or
pretty close?
I=99m running something like an endurance bus. My worst case load is
near
20A. I realize that the switch most likely wouldn=99t be swung in th
at
condition so arcing isn't much concern. And that load would require comm
and transponder xmitting, and the AP and trim at full steam in three axes.
I=99m not in production. A few $$ is a drop in the bucket.
Which bring up another question: although the AP motor loads are relatively
small, do the steppers create a traditional inductive load? Or can I just
lump them in with the more significant resistive loads?
=94Dave
>
>
Message 5
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| Subject: | Re: Alternator stops working at low idle RPM |
Bob,
Thanks to you and all members that have provided help. I will post updates on the
developments
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=493861#493861
Message 6
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| Subject: | Re: Switch ratings? |
>
>
>I want the locking feature, and to match some existing hardware.
>
>If I bus two poles together can I assume each
>works half as hard?=C2 Or pretty close?
No . . .but not worth worrying about . . .
>I=99m running something like an endurance
>bus.=C2 My worst case load is near 20A.=C2 I
>realize that the switch most likely wouldn=99t
>be swung in that condition so arcing isn't much
>concern.=C2 And that load would require comm and
>transponder xmitting, and the AP and trim at
>full steam in three axes. I=99m not in
>production.=C2 A few $$ is a drop in the bucket.=C2
Go ahead and wire it in . . .paralleled poles if you wish . . .
won't make any difference but won't hurt anything either.
>Which bring up another question: although the AP
>motor loads are relatively small, do the
>steppers create a traditional inductive
>load?=C2 Or can I just lump them in with the more significant =C2
resistive loads?
In this application, your machinations over ratings
are not useful. Drive ahead with confidence.
The ratings are predicated on thousands of operations
at some current load combined with reactive features.
The CARRY current of any switch is a lot higher than
rated SWITCHING currents. Consider the 70A rated
devices used as battery master contactors for nearly
100 years.
Bob . . .
Message 7
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| Subject: | Re: Switch ratings? |
>>I=99m running something like an endurance
>>bus.=C2 My worst case load is near 20A.=C2
Is this a DUAL feed bus?
Bob . . .
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