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rjquillin(at)cox.net
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 Posted: Sat Dec 28, 2013 1:57 pm Post subject: Source for Relay – DPDT (On) Off (On) ? |
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Unlikely you'll find what you describe.
Have you considered and dismissed the use of two DPDT relays?
At 12:58 12/28/2013, you wrote:
[quote]--> AeroElectric-List message posted by: "Valin" <thorn(at)starflight.aero>
Hey gang,
Can anyone help me find a source for this type relay – DPDT (On) Off (On), 28 VDC, Max 15 Amps? Online I can find plenty of DPDT relays but not with the (On) Off (On) throw…
I’m trying to make the VPX’s flap controls circuit/logic work with the Lancair Legacy’s flap circuitry that provides motor braking at the limits by grounding both sides of the motor.
Thanks,
Valin Thorn
Lancair Legacy Project
Boulder, Colorado
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=416291#416291
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nuckolls.bob(at)aeroelect
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| Posted: Sun Dec 29, 2013 11:37 am Post subject: Source for Relay – DPDT (On) Off (On) ? |
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At 11:35 PM 12/28/2013, you wrote:
| Quote: |
Here's more detail in what I'm trying to
accomplish in trying to use the VPX and its flap
control features with the motor breaking
circuitry of the Lancair Legacy flap control mechanism.
The good things the VPX does for flap control is
not allow deployment above the maximum flap
extended speed, incremental
deployment/retraction with flap momentary switch
activation, and read/display its position.
The VPX controls the flap motor by changing the
polarity of the outputs driving the flap motor.
The Legacy's flap control circuitry, with motor
braking (grounding both sides) when not driving
the motor or at its deploy and retraction
limits, drives the motor in different direction
at the flap switch (DPDT (Retract) Off (Deploy))
with the positive electrical connection to both
the retract and deploy circuits. See attachment.
This is much the way Bob N. showed how to do it
where he was switching the ground.
So it seems that with the VPS sending out motor
commands just directly changing the polarity
that it could be hooked up to a Relay replacing
the manual flap switch function DPDT (On) Off
(On). But as some have pointed out, there's apparently no such animal.
I'm not sure how to take the changing flap
control polarity coming out of the VPX and set
up two relays to achieve the same result in the
Lancair wiring of the DPDT flap control switch.
I'm at novice at this but will think about it
some more tomorrow. If anyone can suggest a
specific solution to this interesting challenge I’d sure appreciate it.
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My first response to this thread was without
benefit of capable image viewing . . . got a Kindle
for xmas . . . pretty amazing but limited.
No special changes needed. The wiring shown is
what I suggested earlier . . . a pair of spdt
relays for extend, retract and dynamic braking.
Output from the VPX is going to + and ground
or ground and + . . . you can wire
these outputs directly to the limit switches
depicted in the Lancair drawing.
Bob . . .
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