Today's Message Index:
----------------------
1. 02:51 AM - Re: Wiring dual fuel pumps to single switch (carrollcw)
2. 07:39 AM - Re: Wiring dual fuel pumps to single switch (Justin Jones)
3. 07:58 AM - Re: Wiring dual fuel pumps to single switch (John Tipton)
4. 08:38 AM - Re: Re: Wiring dual fuel pumps to single switch (Charlie England)
5. 08:58 AM - Re: Re: Wiring dual fuel pumps to single switch (Robert L. Nuckolls, III)
6. 09:02 AM - Re: Re: Wiring dual fuel pumps to single switch (Jeff Luckey)
7. 10:11 AM - Re: Re: Wiring dual fuel pumps to single switch (Charlie England)
8. 05:24 PM - stacking ring terminals on terminal post (Ken Ryan)
9. 05:38 PM - Re: stacking ring terminals on terminal post (Joe Motis)
10. 06:03 PM - Re: stacking ring terminals on terminal post (BobsV35B@aol.com)
11. 10:20 PM - Re: stacking ring terminals on terminal post (Chuck Birdsall)
Message 1
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| Subject: | Re: Wiring dual fuel pumps to single switch |
Ceengland, if you posted a picture, it's not showing up for me.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=435804#435804
Message 2
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| Subject: | Re: Wiring dual fuel pumps to single switch |
If you don=92t want to do it with 2 separate switches, I would suggest
looking at a rotary switch. Pay attention to the switch amperage
ratings as it may require a relay to drive a fuel pump. Keep in mind
that with this option, you will not have the ability to turn both pumps
on simultaneously.
The 2 switches below may work.
http://www.digikey.com/product-detail/en/MRT23-A/360-2376-ND/1046092
<http://www.digikey.com/product-detail/en/MRT23-A/360-2376-ND/1046092>
http://www.digikey.com/product-detail/en/HS13Y-D/360-2350-ND/2039688
<http://www.digikey.com/product-detail/en/HS13Y-D/360-2350-ND/2039688>
link to the knob for this switch (
http://www.digikey.com/product-detail/en/AT432/360-2366-ND/639088
<http://www.digikey.com/product-detail/en/AT432/360-2366-ND/639088> )
There are many more options out there for rotary switches.
Hope this helps
Justin
> On Dec 16, 2014, at 5:03 PM, carrollcw <carrollswa@gmail.com> wrote:
>
<carrollswa@gmail.com>
>
> How can I wire a single dual pole switch to control 2 fuel pumps, only
one of which can operate at once with the switch being off bottom, pump
1 middle, pump 2 top. I also need each pump to have an independent power
source. I thought I could do it with a 2-1, but I can only get it to go
on-off-on. Is there a dual pole switch that will accomplish this?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=435793#435793
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Wiring dual fuel pumps to single switch |
What you want to do is achievable (I believe) with a 2-10, which is an ON-ON
-ON - 2 Pole - so wire as you will
see here:
Ebay: 131380680747
Or 'Steinair'
John
Sent from my iPad
----x--O--x----
> On 17 Dec 2014, at 03:37 pm, Justin Jones <jmjones2000@mindspring.com> wro
te:
>
> If you don=99t want to do it with 2 separate switches, I would sugge
st looking at a rotary switch. Pay attention to the switch amperage ratings
as it may require a relay to drive a fuel pump. Keep in mind that with thi
s option, you will not have the ability to turn both pumps on simultaneously
.
>
> The 2 switches below may work.
>
> http://www.digikey.com/product-detail/en/MRT23-A/360-2376-ND/1046092
>
>
> http://www.digikey.com/product-detail/en/HS13Y-D/360-2350-ND/2039688 link
to the knob for this switch ( http://www.digikey.com/product-detail/en/AT4
32/360-2366-ND/639088 )
>
>
>
> There are many more options out there for rotary switches.
>
> Hope this helps
>
> Justin
>
>
>> On Dec 16, 2014, at 5:03 PM, carrollcw <carrollswa@gmail.com> wrote:
>>
m>
>>
>> How can I wire a single dual pole switch to control 2 fuel pumps, only on
e of which can operate at once with the switch being off bottom, pump 1 midd
le, pump 2 top. I also need each pump to have an independent power source. I
thought I could do it with a 2-1, but I can only get it to go on-off-on. Is
there a dual pole switch that will accomplish this?
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=435793#435793
>
>
>
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D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
Message 4
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| Subject: | Re: Wiring dual fuel pumps to single switch |
On 12/17/2014 4:49 AM, carrollcw wrote:
>
> Ceengland, if you posted a picture, it's not showing up for me.
>
>
No pic; just a reminder that using one switch means a potential single
point of failure for both fuel pumps. Might be acceptably low risk, but
should be considered.
Message 5
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| Subject: | Re: Wiring dual fuel pumps to single switch |
At 10:38 2014-12-17, you wrote:
><ceengland7@gmail.com>
>
>On 12/17/2014 4:49 AM, carrollcw wrote:
>>
>>Ceengland, if you posted a picture, it's not showing up for me.
>>
>No pic; just a reminder that using one switch means a potential
>single point of failure for both fuel pumps. Might be acceptably low
>risk, but should be considered.
As John mentioned, you can wire a =10 style toggle
switch to offer single pole, three position functionality
as described in chapter 11 of the 'Connection.
Here is one example of this technique.
Emacs!
A single-pole, three position, center-off will
work too . . . but this makes the switch different
from all the rest in that OFF is not fully down
but mid-position.
Charlie's question goes to the notion that if
you have two such pumps, then we assume that one
must be operational at all times to keep the engine
running . . . hence a spare pump. If this is
true, then consider the fact that the pump
can fail to work for a host of reasons . . .
broken wire, bad switch, blown fuse, etc.
If one pump circuit goes bad and pops the fuse,
then the single failure may take down both
pumps.
The legacy failure mode effects analysis
suggests that the two pumps are best installed
as totally separate entities with dedicated
switches and power sources.
Bob . . .
Message 6
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| Subject: | Re: Wiring dual fuel pumps to single switch |
If you're taking a poll...
I add my vote to what Charlie said. One switch is a single point of failure -
if it fails you could lose both pumps.
Just occurred to me: Do you have a situation where you want to prevent both pumps
from being on simultaneously? Could use a mechanical interlock between 2 switches
if that is the case.
-Jeff
On Wednesday, December 17, 2014 8:53 AM, Charlie England <ceengland7@gmail.com>
wrote:
On 12/17/2014 4:49 AM, carrollcw wrote:
>
> Ceengland, if you posted a picture, it's not showing up for me.
>
>
No pic; just a reminder that using one switch means a potential single
point of failure for both fuel pumps. Might be acceptably low risk, but
should be considered.
Message 7
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| Subject: | Re: Wiring dual fuel pumps to single switch |
On Wed, Dec 17, 2014 at 10:54 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
>
> At 10:38 2014-12-17, you wrote:
>
> ceengland7@gmail.com>
>
> On 12/17/2014 4:49 AM, carrollcw wrote:
>
> >
>
> Ceengland, if you posted a picture, it's not showing up for me.
>
> No pic; just a reminder that using one switch means a potential single
> point of failure for both fuel pumps. Might be acceptably low risk, but
> should be considered.
>
>
> As John mentioned, you can wire a =10 style toggle
> switch to offer single pole, three position functionality
> as described in chapter 11 of the 'Connection.
>
> Here is one example of this technique.
>
>
> [image: Emacs!]
>
>
> A single-pole, three position, center-off will
> work too . . . but this makes the switch different
> from all the rest in that OFF is not fully down
> but mid-position.
>
> Charlie's question goes to the notion that if
> you have two such pumps, then we assume that one
> must be operational at all times to keep the engine
> running . . . hence a spare pump. If this is
> true, then consider the fact that the pump
> can fail to work for a host of reasons . . .
> broken wire, bad switch, blown fuse, etc.
> If one pump circuit goes bad and pops the fuse,
> then the single failure may take down both
> pumps.
>
> The legacy failure mode effects analysis
> suggests that the two pumps are best installed
> as totally separate entities with dedicated
> switches and power sources.
>
> Bob . . .
>
I think he spec'd separate power sources for each pump. But a mechanical
failure (cracked housing allowing the switch to fall apart, etc), while
admittedly rather low risk for a quality switch, could still take out both
pumps.
Message 8
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| Subject: | stacking ring terminals on terminal post |
What's the accepted practice for stacking ring terminals on a terminal
post? Rotax 914 diagram shows 5 wires coming together at a capacitor.
What's the best way to make that connection?
Message 9
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| Subject: | Re: stacking ring terminals on terminal post |
With new star washers and noalox?
2/3
more than that??
uh uh..
One man's opinion
On Wed, Dec 17, 2014 at 5:21 PM, Ken Ryan <keninalaska@gmail.com> wrote:
>
> What's the accepted practice for stacking ring terminals on a terminal
> post? Rotax 914 diagram shows 5 wires coming together at a capacitor.
> What's the best way to make that connection?
>
> *
>
>
> *
>
>
Message 10
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| Subject: | Re: stacking ring terminals on terminal post |
Don't know what is being taught these days, but when I went through
Aviation Electricians Mate school in 1947 we were told no more than three ring
terminals per post. No star washers were to be used because they interfered
with good clean contact.
Happy Skies,
Old Bob
Corporal USMC 646659 AEM
In a message dated 12/17/2014 7:25:57 P.M. Central Standard Time,
keninalaska@gmail.com writes:
What's the accepted practice for stacking ring terminals on a terminal
post? Rotax 914 diagram shows 5 wires coming together at a capacitor. What's
the best way to make that connection?
Message 11
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| Subject: | Re: stacking ring terminals on terminal post |
Currently being taught is no more than 4 terminals per post. If more
connections are needed, then use two posts with a buss bar connecting
the two of them - and no more than 3 terminals plus the buss bar per post.
Reference is AC 43.13-1B Chapter 11 Sections 8 & 14.
See also the section beginning at page 98 in this training manual:
http://www.keybridgeti.com/videotraining/manualdl/25827.PDF (which
includes a discussion about washers).
So, to answer the question directly - in my mind, the standard method
would be to terminate all five wires with a ring terminal. Use two
adjacent terminal posts on a terminal strip, bridge them with a buss bar
and attach two terminals to one post and three to the other.
Alternatively you could make a short jumper wire with a terminal on each
end, and use it to bridge two posts (you'll wind up with 4 terminals on
one post and 3 on the other). *(Wires and/or buss bars sized
appropriately for the current load.)
Now I'm going to muddy the water a bit. 43.13-1B does say that more
than 4 terminals can be placed on a post IF specifically authorized. In
the Type-Certificated world that I live in, it's much easier to just
wire it to the standard (4 or less per post) than it is to go get
approval to do it differently - unless there is an "approved" source
(such as an install manual for an STC'd item) telling me to do it
differently.
Chuck
On 12/17/2014 8:02 PM, BobsV35B@aol.com wrote:
> Don't know what is being taught these days, but when I went through
> Aviation Electricians Mate school in 1947 we were told no more than
> three ring terminals per post. No star washers were to be used because
> they interfered with good clean contact.
> Happy Skies,
> Old Bob
> Corporal USMC 646659 AEM
> In a message dated 12/17/2014 7:25:57 P.M. Central Standard Time,
> keninalaska@gmail.com writes:
>
> What's the accepted practice for stacking ring terminals on a
> terminal post? Rotax 914 diagram shows 5 wires coming together at
> a capacitor. What's the best way to make that connection?
>
> *
>
> *
>
> *
> *
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