Valin
Joined: 13 Apr 2010
Posts: 31
Location: Colorado
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 Posted: Sun Dec 29, 2013 4:02 pm Post subject: Source for Relay DPDT (On) Off (On ? -- VPX to Lancair Flap |
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Thanks Bob McC, you have an excellent memory. I’ve corrected those labels now.
I’ve worked up a drawing with yours and the other’s suggestion to just use two relays to interface between the VPX and Lancair flap motor circuitry. I’ve attached the drawing. If anyone sees any problems or can suggest how to make it simpler please let me know.
I expect Marc at VPX will be concerned the VPX will use the position senor to stop the flaps and if a limit switch stops it first the VPX will see it as a fault. So for it to work this way the VPX stop settings using the position sensor (not as accurate) will have to be in sync with the limit switches. And the position sensor may not be accurate enough to sync with the limit switches.
A big thanks for everyone’s help!
Valin
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Bob McCallum
Sent: Sunday, December 29, 2013 9:34 AM
To: aeroelectric-list(at)matronics.com
Subject: RE: Re: Source for Relay – DPDT (On) Off (On) ?
Valin;
It's simple enough to take the two wires which reverse polarity (and which I would assume turn off when no motion is desired) and wire them to two relays through a pair of diodes such that one polarity energizes one relay and the other polarity energizes the other relay. One polarity thus energizes the "up" relay, opposite polarity energizes the "down" relay.
(As an aside the Lancair drawing you’ve included still has the same error in the notes on the motor leads that we discussed back in May of 2010. Where adjacent to the red wire it says “- negative close actuator extend flaps” it should be “+ positive close actuator extend flaps”)
Bob McC
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