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carrollcw
Joined: 22 Oct 2014
Posts: 8
Location: Friendswood, TX
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 Posted: Tue Dec 16, 2014 6:03 pm Post subject: Wiring dual fuel pumps to single switch |
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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?
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ceengland7(at)gmail.com
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| Posted: Tue Dec 16, 2014 8:32 pm Post subject: Wiring dual fuel pumps to single switch |
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On 12/16/2014 8:03 PM, carrollcw wrote:
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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?
A mechanical failure of the switch could take out both pumps; is that
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acceptable?
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carrollcw
Joined: 22 Oct 2014
Posts: 8
Location: Friendswood, TX
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| Posted: Wed Dec 17, 2014 2:49 am Post subject: Re: Wiring dual fuel pumps to single switch |
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Ceengland, if you posted a picture, it's not showing up for me.
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jmjones2000(at)mindspring
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| Posted: Wed Dec 17, 2014 7:39 am Post subject: Wiring dual fuel pumps to single switch |
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If you don’t 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/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 )
There are many more options out there for rotary switches.
Hope this helps
Justin
| Quote: | On Dec 16, 2014, at 5:03 PM, carrollcw <carrollswa(at)gmail.com (carrollswa(at)gmail.com)> wrote:
--> AeroElectric-List message posted by: "carrollcw" <carrollswa(at)gmail.com (carrollswa(at)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
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[quote][b]
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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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| Posted: Wed Dec 17, 2014 7:58 am Post subject: Wiring dual fuel pumps to single switch |
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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[url=tel:131380680747]: 131380680747[/url]
Or 'Steinair'
John
Sent from my iPad
----x--O--x----
On 17 Dec 2014, at 03:37 pm, Justin Jones <jmjones2000(at)mindspring.com (jmjones2000(at)mindspring.com)> wrote:
[quote]If you don’t 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/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 )
There are many more options out there for rotary switches.
Hope this helps
Justin
| Quote: | On Dec 16, 2014, at 5:03 PM, carrollcw <carrollswa(at)gmail.com (carrollswa(at)gmail.com)> wrote:
--> AeroElectric-List message posted by: "carrollcw" <carrollswa(at)gmail.com (carrollswa(at)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
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| Quote: |
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[b]
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ceengland7(at)gmail.com
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| Posted: Wed Dec 17, 2014 8:38 am Post subject: Wiring dual fuel pumps to single switch |
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On 12/17/2014 4:49 AM, carrollcw wrote:
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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
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point of failure for both fuel pumps. Might be acceptably low risk, but
should be considered.
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jluckey(at)pacbell.net
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| Posted: Wed Dec 17, 2014 9:02 am Post subject: Wiring dual fuel pumps to single switch |
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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(at)gmail.com> wrote:
--> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>
On 12/17/2014 4:49 AM, carrollcw wrote:
| Quote: | --> AeroElectric-List message posted by: "carrollcw" <carrollswa(at)gmail.com (carrollswa(at)gmail.com)>
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
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point of failure for [quote][b]
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ceengland7(at)gmail.com
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| Posted: Wed Dec 17, 2014 10:11 am Post subject: Wiring dual fuel pumps to single switch |
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On Wed, Dec 17, 2014 at 10:54 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote: | Quote: | At 10:38 2014-12-17, you wrote:
| Quote: | --> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>
On 12/17/2014 4:49 AM, carrollcw wrote:
| Quote: | --> AeroElectric-List message posted by: "carrollcw" <carrollswa(at)gmail.com (carrollswa(at)gmail.com)>
Ceengland, if you posted a picture, it's not showing up for me.
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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.
[img]cid:7.1.0.9.0.20141217104722.01fca940(at)aeroelectric.com.0[/img]
  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 . . .
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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.Â
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