imugford Posted December 9, 2007 Report Share Posted December 9, 2007 Hi all - just wondering if anyone runs a working single lane loop that doubles back on itself with automatic current switching Ian Quote Link to comment Share on other sites More sharing options...
gazza Posted December 9, 2007 Report Share Posted December 9, 2007 This is from Archer Raceway (Oldslotracer) http://www.oldslotracer.com/index.html Here's a sketch of the reversing loop, and a wiring diagram for those that understand it (I don't) It's a solenoid triggered by the dead strip at the top of the hill, and reset by a toggle switch when you get back to the bottom. I suppose it would work with a loop at the bottom as well, but I just wanted a timed run Quote Quickly read this post before it is deleted or i turn grey again Gary http://www.facebook.com/Rallyproxy2017 Link to comment Share on other sites More sharing options...
imugford Posted December 9, 2007 Author Report Share Posted December 9, 2007 thanks gazza Quote Link to comment Share on other sites More sharing options...
Rev Rev Posted February 1, 2008 Report Share Posted February 1, 2008 If you can explain it, I will build it. I've dreamed of having one of these in the track that is currently underconstruction. If anyone can translate Electronics into English I am listening, and eager to see it in action on my track. Quote Link to comment Share on other sites More sharing options...
Johno Posted February 1, 2008 Report Share Posted February 1, 2008 Yeah I agree Or even if anyone has some photos of it in action The drawing of the loop looks easy enough but the rest is a bit Quote Link to comment Share on other sites More sharing options...
phoeno29 Posted February 1, 2008 Report Share Posted February 1, 2008 if someone makes a few of these up and has them as such a point where as you just attach tothe table, add wire 1 to left tape, wire 2 to right tape etc, I would buy one as I have plans....... Quote Find me at Card Guys for custom trading cards Link to comment Share on other sites More sharing options...
mtpanorama Posted February 2, 2008 Report Share Posted February 2, 2008 Don't know what sort of explanation you guys are after but I will give it a go. The contacts on the relay or solenoid as it is called in the diagram is connected to the wires that give power to the track, with the relay off the car travels towards the loop. As the car goes over the dead spot the relay is switched on and locks on through another contact, the power to the track is reversed allowing the car to travel away from the loop. The toggle switch (a push button momentary off switch would probably be better) is used to cut the locking circuit to the relay turning it off so the power is back to normal. I don't think it could be made as a stand alone item as it basically already is, you just need a relay, a switch and the track to connect it to, but I could be wrong. Hope this helps Quote Corporate greed is driving inflation. Cash, use it or lose it. No Digital Currency, No Digital ID. Link to comment Share on other sites More sharing options...
Count Posted February 2, 2008 Report Share Posted February 2, 2008 (edited) here's a video I found on the 'net of said rally loop Edited February 2, 2008 by Count Quote Pretzel Logic Raceway Ask not what MDF can do to you, rather ask what you can do to MDF! Link to comment Share on other sites More sharing options...
Johno Posted February 28, 2008 Report Share Posted February 28, 2008 (edited) As the car goes over the dead spot the relay is switched on and locks on through another contact, the power to the track is reversed allowing the car to travel away from the loop. I had a go at wiring all of this up. I bought this relay SY4009 from Jaycar And wired it up using the above diagram. It all seems to work...the car goes towards the loop, around and hits the dead spot, I can hear the relay click and see the connection switch but then when the car leaves the dead spot the relay switches back immediately and doesnt stay on. The reverse part definately works as I can leave a car on the dead spot and another car will run back the other way but obviously that is no good. The only thing I can think of is the switch part which runs between the dead spot and the coil. I have figured it to be a simple SPST momentary switch....perhaps it is something different. So the question is have I bought the wrong relay or is there something else I need to do to get the relay to lock on when activated? So close......grrrr Edited February 28, 2008 by Johno Quote Link to comment Share on other sites More sharing options...
Johno Posted February 28, 2008 Report Share Posted February 28, 2008 Hmm reading about relays on Wikipedia I may need a Latching relay that when the current is switched off, the relay remains in its last state. Im guessing the one I bought doesn't do this. Might have to go pester the blokes at Jaycar again Quote Link to comment Share on other sites More sharing options...
mtpanorama Posted February 29, 2008 Report Share Posted February 29, 2008 As the car goes over the dead spot the relay is switched on and locks on through another contact, the power to the track is reversed allowing the car to travel away from the loop. I had a go at wiring all of this up. I bought this relay SY4009 from Jaycar And wired it up using the above diagram. It all seems to work...the car goes towards the loop, around and hits the dead spot, I can hear the relay click and see the connection switch but then when the car leaves the dead spot the relay switches back immediately and doesnt stay on. The reverse part definately works as I can leave a car on the dead spot and another car will run back the other way but obviously that is no good. The only thing I can think of is the switch part which runs between the dead spot and the coil. I have figured it to be a simple SPST momentary switch....perhaps it is something different. So the question is have I bought the wrong relay or is there something else I need to do to get the relay to lock on when activated? So close......grrrr Sounds like you might have forgot part of the circuit, have you wired the relay up to a set of contacts on the relay so when the relay operates it will hold itself on like the forth set of contacts on the circuit diagram above. Quote Corporate greed is driving inflation. Cash, use it or lose it. No Digital Currency, No Digital ID. Link to comment Share on other sites More sharing options...
pmc356 Posted February 29, 2008 Report Share Posted February 29, 2008 Not sure but looked up the relay they have used and it sounds like an odd one (KHAU-17D11-12) Relay However got confused by more information Info Hmm not sure if that helps after all perhaps ask the guys at Jaycar Quote Paul Link to comment Share on other sites More sharing options...
Johno Posted February 29, 2008 Report Share Posted February 29, 2008 (edited) I think I have it sorted. I have got the wrong type of switch for the reset mechanism. I must have bought a momentary on switch not an off. With the switch wired in the relay is turning off straight away but I removed the switch from the circuit and the relay turned on and stayed on until I untwisted the two wires breaking that circuit. So I will drop into Jaycar this arvo and get a different switch Thx for the help MtP and everyone Edited February 29, 2008 by Johno Quote Link to comment Share on other sites More sharing options...
Johno Posted March 1, 2008 Report Share Posted March 1, 2008 Well I picked up a normally closed switch and soldered it into my test loop and it all works. Ive taken a cpl of photos but I doubt they will be of any use. As you can see my wiring and solder work leaves ALOT to be desired. Luckily its not permanent Easy Quote Link to comment Share on other sites More sharing options...
gazza Posted March 2, 2008 Report Share Posted March 2, 2008 Have you got a part number for the correct switch? Quote Quickly read this post before it is deleted or i turn grey again Gary http://www.facebook.com/Rallyproxy2017 Link to comment Share on other sites More sharing options...
Johno Posted March 2, 2008 Report Share Posted March 2, 2008 I think it is SP-0717 from Jaycar But any SPST switch momentary switch that is NC (normally closed) is fine. That was the only one they had that was NC though. All the rest where NO Quote Link to comment Share on other sites More sharing options...
Matticus Posted March 3, 2008 Report Share Posted March 3, 2008 So how does it know when the car has rejoined the single lane rather than the loop? Also how is the polarity switched for the rails? I'd presume there is one of these at both ends, and as the car switches one open it closes the other in preaparation for the return leg? Quote Beauty. Link to comment Share on other sites More sharing options...
Johno Posted March 3, 2008 Report Share Posted March 3, 2008 Thats what the switch is for matt. As the car trips the relay it changes the polarity and runs back down the hill to the finish line. Once done you click the button on the switch and it resets back to uphill again. I guess you could have 2 loops at each end if you wanted to run continual laps and not time trials Quote Link to comment Share on other sites More sharing options...
mtpanorama Posted March 4, 2008 Report Share Posted March 4, 2008 Good to see you got it going. Quote Corporate greed is driving inflation. Cash, use it or lose it. No Digital Currency, No Digital ID. Link to comment Share on other sites More sharing options...
Johno Posted March 6, 2008 Report Share Posted March 6, 2008 Sadly I have hit a new hiccup in my hill climb. I wired the track up this evening and on testing the car drives up the hill goes around the loop, over the dead spot but then it fails to trigger the relay. I put the car back bit and try again and the same thing, the car drives straight over the dead spot without triggering the relay So then I get the car and push it along the track and over the dead spot and click the relay activates. I push it along again and click the relay works. So I know the dead spot works and triggers the relay, just not while im running a lap. No idea if it is a speed thing or something else but it is a bit annoying. Quote Link to comment Share on other sites More sharing options...
mtpanorama Posted March 7, 2008 Report Share Posted March 7, 2008 Make sure your braids are clean and touching the track while the car is going over the dead spot, maybe try different cars. Quote Corporate greed is driving inflation. Cash, use it or lose it. No Digital Currency, No Digital ID. Link to comment Share on other sites More sharing options...
Johno Posted March 8, 2008 Report Share Posted March 8, 2008 :purplebounce: Im at a loss This morning I have tried - a couple of different cars - lengthening the dead strip - lengthening the gap between the live track and the dead strip - covering the dead strip with solder - increasing the height of the dead strip to ensure contact with the braids and still I have the same problem when driving the car it passes over the dead spot the relay is not activating and yet I can push the car over the dead spot and it works or I can hold the car over the dead spot and touch it ever so lightly and it works just not when driving Quote Link to comment Share on other sites More sharing options...
mtpanorama Posted March 8, 2008 Report Share Posted March 8, 2008 Do you have separate power supplies for the track and the relay. Quote Corporate greed is driving inflation. Cash, use it or lose it. No Digital Currency, No Digital ID. Link to comment Share on other sites More sharing options...
Johno Posted March 8, 2008 Report Share Posted March 8, 2008 (edited) Do you have separate power supplies for the track and the relay. Its all running off the one power supply. Do you think it would make a difference if I wired up the relay part of the schematic to a separate power supply? Edited March 8, 2008 by Johno Quote Link to comment Share on other sites More sharing options...
mtpanorama Posted March 8, 2008 Report Share Posted March 8, 2008 It might be worth a try, although in theory once the car hits the dead spot all the power should be available to the relay. That gives me another thought, might be something to do with the hand controller, try pushing the car over the dead spot with the trigger on the hand controller in the position that it would be in if you were driving the car, you might be drawing power through the controller some how that is stopping the relay from operating. Quote Corporate greed is driving inflation. Cash, use it or lose it. No Digital Currency, No Digital ID. Link to comment Share on other sites More sharing options...
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