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bicyclop(at)pacbell.net
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 Posted: Mon Jan 12, 2009 8:44 am Post subject: [Fwd: Re: Switch Combinations] |
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Lightspeed EIs wire opposite the way magnetos do. It wires like most other electrical devices, ie: the switch breaks the 12v (+) side. Closed is on. If the switch fails to close, no spark.
With a magneto, open is on. Closed grounds out the primary coil so it won't produce a spark out of the secondary coil. If the switch fails to close, the mag is hot even after being turned off. Danger Will Robinson. Be careful around the prop.
Switch, wiring or fuse failures take out an electronic ignition (P-mag may be different). Switch or wire failures generally take out the ability to turn off a magneto. The failure modes of each should be considered carefully and designed for. I agree with Frank. It's a bad idea to have a setup where a failure of one switch would take out both ignitions. I don't like the key turn mag/start switches for that reason. I've seen several of them not work right, one right out of the box.
Pax,
Ed Holyoke
Hinde, Frank George (Corvallis) wrote: [quote] (at)font-face { font-family: Cambria Math; } (at)font-face { font-family: Calibri; } (at)page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.0in 1.0in 1.0in; } P.MsoNormal { FONT-SIZE: 11pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Calibri","sans-serif" } LI.MsoNormal { FONT-SIZE: 11pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Calibri","sans-serif" } DIV.MsoNormal { FONT-SIZE: 11pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Calibri","sans-serif" } A:link { COLOR: blue; TEXT-DECORATION: underline; mso-style-priority: 99 } SPAN.MsoHyperlink { COLOR: blue; TEXT-DECORATION: underline; mso-style-priority: 99 } A:visited { COLOR: purple; TEXT-DECORATION: underline; mso-style-priority: 99 } SPAN.MsoHyperlinkFollowed { COLOR: purple; TEXT-DECORATION: underline; mso-style-priority: 99 } SPAN.EmailStyle17 { COLOR: windowtext; FONT-FAMILY: "Calibri","sans-serif"; mso-style-type: personal-compose } .MsoChpDefault { mso-style-type: export-only } DIV.Section1 { page: Section1 } <![endif]--> <![endif]--> Maybe but why would you want to use a single switch..You now have a critical component that if it fails your engine will quit. I know that as the Plead is a ground lead that this is unlikely (assuming the Lightspeed switches the same way a mag does) but even so why do it for the sake of another switch?
FWIW.
Frank
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On Behalf Of longg(at)pjm.com (longg(at)pjm.com)
Sent: Monday, January 12, 2009 7:28 AM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Switch Combinations
I am using Z13/8 with a dual EI (Lightspeed) setup. By default I have two ignition switches for L/R or front and back if you prefer. Since I am not using a keyway switch I am wondering if there is a way to wire a single switch to manage both EI’s? My design goal is to eliminate additional switches where they can otherwise be combined.
Glenn
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frank.hinde(at)hp.com
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| Posted: Mon Jan 12, 2009 9:06 am Post subject: [Fwd: Re: Switch Combinations] |
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Well in that case as the Lightspeed switch the hot connection I would suggest combinging the switches is not quite suicidal but close!
Switch goes open circuit (or intermittent) and your engine will quit...this is a very bad idea..Almost as bad as having a single fuse serving both ignitions..Don't do it!
Both ignitions must be wired completely seperate...wiring, fuses, switches.
Incidently the E/Pmags are wired like a regular mag, but I still switch them seperate.
Frank
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Ed Holyoke
Sent: Monday, January 12, 2009 8:43 AM
To: aeroelectric-list(at)matronics.com
Subject: [Fwd: Re: AeroElectric-List: Switch Combinations]
Lightspeed EIs wire opposite the way magnetos do. It wires like most other electrical devices, ie: the switch breaks the 12v (+) side. Closed is on. If the switch fails to close, no spark.
With a magneto, open is on. Closed grounds out the primary coil so it won't produce a spark out of the secondary coil. If the switch fails to close, the mag is hot even after being turned off. Danger Will Robinson. Be careful around the prop.
Switch, wiring or fuse failures take out an electronic ignition (P-mag may be different). Switch or wire failures generally take out the ability to turn off a magneto. The failure modes of each should be considered carefully and designed for. I agree with Frank. It's a bad idea to have a setup where a failure of one switch would take out both ignitions. I don't like the key turn mag/start switches for that reason. I've seen several of them not work right, one right out of the box.
Pax,
Ed Holyoke
Hinde, Frank George (Corvallis) wrote: [quote] (at)font-face { font-family: Cambria Math; } (at)font-face { font-family: Calibri; } (at)page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.0in 1.0in 1.0in; } P.MsoNormal { FONT-SIZE: 11pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Calibri","sans-serif" } LI.MsoNormal { FONT-SIZE: 11pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Calibri","sans-serif" } DIV.MsoNormal { FONT-SIZE: 11pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Calibri","sans-serif" } A:link { COLOR: blue; TEXT-DECORATION: underline; mso-style-priority: 99 } SPAN.MsoHyperlink { COLOR: blue; TEXT-DECORATION: underline; mso-style-priority: 99 } A:visited { COLOR: purple; TEXT-DECORATION: underline; mso-style-priority: 99 } SPAN.MsoHyperlinkFollowed { COLOR: purple; TEXT-DECORATION: underline; mso-style-priority: 99 } SPAN.EmailStyle17 { COLOR: windowtext; FONT-FAMILY: "Calibri","sans-serif"; mso-style-type: personal-compose } .MsoChpDefault { mso-style-type: export-only } DIV.Section1 { page: Section1 } <![endif]--> <![endif]--> Maybe but why would you want to use a single switch..You now have a critical component that if it fails your engine will quit. I know that as the Plead is a ground lead that this is unlikely (assuming the Lightspeed switches the same way a mag does) but even so why do it for the sake of another switch?
FWIW.
Frank
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On Behalf Of longg(at)pjm.com (longg(at)pjm.com)
Sent: Monday, January 12, 2009 7:28 AM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Switch Combinations
I am using Z13/8 with a dual EI (Lightspeed) setup. By default I have two ignition switches for L/R or front and back if you prefer. Since I am not using a keyway switch I am wondering if there is a way to wire a single switch to manage both EI’s? My design goal is to eliminate additional switches where they can otherwise be combined.
Glenn
ist">http://www.matronics.com/Navigator?AeroElectric-List
ics.com
.matronics.com/contribution
[b]
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