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Vollrath, Don
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My option 3 requires 2 A-R units and 1 relay. DonV -----Original Message-----
From: WiringForDCC@... [mailto:WiringForDCC@...]On Behalf Of Vollrath, Don Sent: Wednesday, November 16, 2005 11:06 AM To: WiringForDCC@... Subject: RE: [WiringForDCC] Reversing section advice Hello Blair. I see 3 Options: 1. Use a standard A-R unit at loop L as you propose. Use Loy's Toys ARSC at section Y. This unit requires extra rail gaps but can handle trains that are longer than the reversing track section, as long as Y is longer than the powered loco consist. It does work, even with a long train of lighted passenger cars, but the location of rail gaps and their width are important, particularly on curves. I can send you more data if you are interested. I also have an improved version that you can build yourself for a lot less $$. Send me a private e-mail. [need 1 A-R unit, 1 Loy's Toys ARSC or equal] 2. Use a conventional A-R unit for track Y, but extend the effective length out to SW1, SW2 and X as you propose by use of a relay sensitive to throwbar position of SW1, only when it is set for track Y. SW1, SW2 & the track leading to X should always be at the same rail polarity as you have indicated. However, Loop L still exists, and it should be possible to pass a train from either side of L to Y through SW2 & SW1. But L itself is a reversing loop and it is not wise to connect two A-R controlled track sections end to end... so control the polarity of track L with yet another relay operated from the exit throwbar position of SW2, from the polarity of the SW2 track, which may be powered from the A-R unit of Y if SW1 is set that way. Photo sensors near SW2 can be used to automatically flip SW2 from either direction, but thats a whole 'nother matter. [1 A-R unit, 2 relays] 3. Use a standard A-R unit at track section Y and extend the effective length of isolated A-R track out into track A via a relay controlled by the throwbar at switch. The isolated extension into A must be long enough to hold an entire train. Leave tracks of SW1 & SW1 at the fixed polarity of B and B'. Use a 2nd standard A-R unit for track L. This can work, but you must also consider available track length of A beyond what is shown in your sketch. If it is long enough to avoid yet another complication of train length or passing restrictions this option may be easy to implement. [1 a-R unit, 1 relay] With options 2 & 3, you must use DPDT relays (or toggle switches) to control rail polarity. DPDT contacts on most switch machines are break before make and can interrupt rail power on moving locos for too long of a time as throwbars change positions. Are my explanations clear enough? DonV Yahoo! Groups Links |
