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pmnewlon
Joined: 20 Jan 2011
Posts: 21
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 Posted: Mon Jul 18, 2011 12:02 pm Post subject: Flap control using (a) relay(s) |
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I have two rows of SPST switches on the lower left of my instrument panel. I failed to allow enough room for the DPDT flap switch and now either have to relocate it or figure out some way to operate the flaps with the SPST (ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for some kind of relay to do the job, but I can only think of how to do it using two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate any thoughts on how to gracefully recover from my design error.
Thanks!
Phil
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lm4(at)juno.com
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| Posted: Mon Jul 18, 2011 12:50 pm Post subject: Flap control using (a) relay(s) |
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Phil,
You could do that job with what is called a "Latching relay"
Larry
On Jul 18, 2011, at 4:02 PM, pmnewlon wrote:
| Quote: |
I have two rows of SPST switches on the lower left of my instrument panel. I failed to allow enough room for the DPDT flap switch and now either have to relocate it or figure out some way to operate the flaps with the SPST (ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for some kind of relay to do the job, but I can only think of how to do it using two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate any thoughts on how to gracefully recover from my design error.
Thanks!
Phil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=346914#346914
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fvalarm(at)rapidnet.net
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| Posted: Mon Jul 18, 2011 1:03 pm Post subject: Flap control using (a) relay(s) |
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You could add a flap controller such as what Vans sells. Has few nice
features.
Bevan
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mrspudandcompany(at)veriz
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| Posted: Mon Jul 18, 2011 1:13 pm Post subject: Flap control using (a) relay(s) |
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I have two rows of SPST switches on the lower left of my instrument panel.
I failed to allow enough room for the DPDT flap switch and now either have
to relocate it or figure out some way to operate the flaps with the SPST
(ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for
some kind of relay to do the job, but I can only think of how to do it using
two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'.
I would appreciate any thoughts on how to gracefully recover from my design
error.
Thanks!
Phil
A simple way is to use two dpst automotive relays, one wired
for flaps up and the other for flaps down, then simply control them with
your installed spdt switch.
Roger
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pmnewlon
Joined: 20 Jan 2011
Posts: 21
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| Posted: Mon Jul 18, 2011 1:13 pm Post subject: Re: Flap control using (a) relay(s) |
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Hmmmm, from what I read of the description of one such relay on the newark site, a latching relay stays in the last position until power is applied in the other direction. I would need a '3 position' relay - up, no power, down.
"Magnetic Latching relays require one pulse of coil power to move their contacts in one direction, and another, redirected pulse
to move them back. Repeated pulses from the same input have no effect. Magnetic Latching relays are useful in applications
where interrupted power should not be able to transition the contacts."
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jul 18, 2011 3:11 pm Post subject: Flap control using (a) relay(s) |
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At 03:02 PM 7/18/2011, you wrote:
| Quote: | --> AeroElectric-List message posted by: "pmnewlon" <philn(at)toosan.com>
I have two rows of SPST switches on the lower left of my instrument panel. I failed to allow enough room for the DPDT flap switch and now either have to relocate it or figure out some way to operate the flaps with the SPST (ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for some kind of relay to do the job, but I can only think of how to do it using two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate any thoughts on how to gracefully recover from my design error. |
Using the pair of relays as shown in
http://www.aeroelectric.com/PPS/Flight/Flaps/Flaps_3.pdf
is about a graceful as it gets. With both relays de-energized,
their relaxed contacts put a dead short on the motor bringing
it to a fast halt. The relays are inexpensive . . .
[img]cid:7.1.0.9.0.20110718175908.010c0130(at)aeroelectric.com.0[/img]
This model comes with it's own mounting bracket.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=255-2729-ND
Bob . . .
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