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dlm46007(at)cox.net
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 Posted: Sat Dec 02, 2006 11:42 am Post subject: door proximty switch system |
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If you have looked at the Vans supplied switches, reversing relays and lights from Radio Shack, you might conclude that there is a better way.
The only thing to be used from the Vans kit is the rod magnet from the RS 49-496 to be inserted in the door pins. By purchasing the RS 49-533 switch you can get a switch that will be open when the magnet is in place. By wiring the switches for each side in parallel with each other and in series with a small RED LED and fuse one can set the system to show red anytime a door is open (switch is closed and LED is drawing 30ma).The RED lights goes out if and only if both pins are in position on each door. Mine will wired to the hot side of the backup battery. Mine will also be hooked in with a current sensing alarm system for the aircraft. If anyone wants to see some pictures email me off the list.
[quote][b]
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jesse(at)itecusa.org
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| Posted: Sat Dec 02, 2006 12:32 pm Post subject: door proximty switch system |
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I agree that that way is an easier way, but I think Van’s wanted to go a safer route. Your way, I assume you are running the ground wire from the LED through the switches, so it makes contact to ground when there is no magnet because the switch is normally closed/open (whichever means that it completes the circuit – closed, right?) and does not complete the circuit when the magnet is sensed. This way, if you have any wire come disconnected, the LED stays OFF. If you have a failure in the system, the light stays off. With the relays, if you have a wire come loose, the light stays ON. Red light ON = danger. Red light OFF = no danger. I think I would rather have the light be ON when the door is closed if there is a failure than the light be OFF when the door is open if there is a failure. While your way would be cheaper, easier, lighter, I think Van’s did it their way on purpose. Thanks for the idea, though. I never looked into it, but like the fact that it can be done that way. I also realize the power is so low that the issue of the relay just using the contact to ground to know when to turn the light off not using as much power as is going through the light circuit is not a real issue (does that sentence flow?). Your design would, however, work the same as Van’s if the switch somehow moved and was not sensing the magnet when the pin was closed.
Do not archive.
Jesse Saint
I-TEC, Inc.
jesse(at)itecusa.org (jesse(at)itecusa.org)
www.itecusa.org
W: 352-465-4545
C: 352-427-0285
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of David McNeill
Sent: Saturday, December 02, 2006 2:41 PM
To: rv10-list(at)matronics.com
Subject: door proximty switch system
If you have looked at the Vans supplied switches, reversing relays and lights from Radio Shack, you might conclude that there is a better way.
The only thing to be used from the Vans kit is the rod magnet from the RS 49-496 to be inserted in the door pins. By purchasing the RS 49-533 switch you can get a switch that will be open when the magnet is in place. By wiring the switches for [b]each side[/b] in parallel with each other and in series with a small RED LED and fuse one can set the system to show red anytime a door is open (switch is closed and LED is drawing 30ma).The RED lights goes out if and only if both pins are in position on each door. Mine will wired to the hot side of the backup battery. Mine will also be hooked in with a current sensing alarm system for the aircraft. If anyone wants to see some pictures email me off the list.
| Quote: | | www.aeroelectric.com |
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-- Date: 12/2/2006 9:59 AM
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12/2/2006 9:59 AM
[quote][b]
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dlm46007(at)cox.net
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| Posted: Sat Dec 02, 2006 1:10 pm Post subject: door proximty switch system |
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One other thing , the LEDs are wired to the hot side of the back up battery, so they are like a car interior light . Door open light on, door closed light off. I also need the current flow as one of the triggers of my alarm. The alarm will draw about 30ma from the backup battery when armed and will have both current sensors and dual level shock sensors.
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dlm46007(at)cox.net
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| Posted: Sat Dec 02, 2006 1:13 pm Post subject: door proximty switch system |
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The system gets checked visually each time you open a door (preflight the aircraft and the red LEDS light). Its possible the ground wire from either switch might become disconnected during flight and cause the light to be off. but would be noticed at the next preflight. all wiring is crimped ring terminals so a bad ground should be very rare. My plan is to check the lights when doors are opened during preflight and then during operation Red lights out, good to go.
I will also be wiring a resistor in parallel with the LED to increase current flow to 60ma when a door is opened so that an alarm (if armed) will sound when the door is opened.
[quote] ---
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