![tam valley octopus iii with rocrail tam valley octopus iii with rocrail](http://2.bp.blogspot.com/-1FjHS0f_U6o/T9dSpECBA8I/AAAAAAAAA44/G-qRz23mDHk/s1600/3-Tracks-Burlingame-S.jpg)
- TAM VALLEY OCTOPUS III WITH ROCRAIL TRIAL
- TAM VALLEY OCTOPUS III WITH ROCRAIL PLUS
- TAM VALLEY OCTOPUS III WITH ROCRAIL SERIES
More often then not aggravated by a sticking or dirty turn-out mechanism. The first and most common one is just lack of electrical power as is often mentioned also by Märklin themselves. When your turn-outs don't switch over there can be a number of causes. The problem with the 74490's is a bit (or a lot) more complex then meets the eye. In the last 3 cases, it's necessary to open the motor. short the switches and use only current pulse for driving the motor.
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TAM VALLEY OCTOPUS III WITH ROCRAIL SERIES
connect a back-emf diode (or 2 x 30V zeners in series if the motor is used in AC, or a 30V transil,) in parallel with each switch. connect a capacitor in parallel with each switch (but there is still a small spark, even with 500nF) May be the quality of the Cherry microswitches ?Īnyway, if we don't want to take the risk to get a failure on a permanent layout, I see 4 solutions Mine were built in 19, then not that old. I read somewhere that the problem occurs only with old Marklin motors. The question is: why some users have no problems, even after many years? (Note: As the switch time can be as low as 10ms, reducing the feeding pulse duration to 100ms or so is useless in this case) Sooner or later, that sparks will lead to a failure. The pic below shows a spark between the 2 contacts of the switch. In order to validate that hypothesis, I opened a microswitch (cutting the top with a cutter) and energized the motor. The cutoff micro switches seemed to be responsible for that, as they have to switch up to 1A rms from an inductive load (if the motor is fed with 16V AC), which is beyond their specifications. The problem was already described on this forum, and in some other national forums. Then try the toggle the way you got it to work - between pins 1 and 3 on the Octopus.As I recently got a problem with a 74490 C turn out motor (not working in 1 direction), followed by the same problem on another 74490, I decided to investigate more in depth. WHere the picture has the wire fromt he bottom LED going to pin 1, the black - connect that wire to pin 2 instead. This differs slightly from the picture - the picture could be wrong. Cathode of LED1 to anode of LED 2 to red. WHite to 330 ohm resistor to cathode of second LED. White to 330 ohm resistor to anode of one led. NO pusbutton connects black to white when pressed. I just grabbedone of mien to look at the circuit. It does briefly short the one LED to send the signal to the Octopus. The fascia controllers work the same way, except with a momentary pushbutton, and an extra resistor for a pullup somewhere. But since it's not given as an option, I think not. Now if it's the OTHER LED that should be on in that position, it might actually work. I don't think this will work though, since when the toggle is closed it will be shorting out the one LED. Next thign would be to connect LEDs to the Ocopus as shown in the lower right diagram in the wiring examples. But if you count 1-2-3 down oen side of the DPDT, and you have 1-2-3 on the switch conenction ont he Octupus, then you should have Octopus #1 to toggle #1, Octopus #3 to toggle #2. OK, sounds like you have the toggle right - using a DPDT is probably confusing you since it has more connections thant you need. No, the Octopus can operate with toggles - that's what the Mtr jumper is - momentary contact to trigger it or a fixed contact (toggle). I don't have one handy to look at to see where it goes. Maybe getting oen and looking at the circuit would help - it's much as I described above as somethign to try except there's an extra resistor.
TAM VALLEY OCTOPUS III WITH ROCRAIL PLUS
I'm guess it's possible, the fascia controllers work in a similar fashion although that s a pushbutton plus LEDs.
![tam valley octopus iii with rocrail tam valley octopus iii with rocrail](http://4.bp.blogspot.com/-Rt8zYXQuSeM/T9dSlPh7whI/AAAAAAAAA4E/OgEN66AksY4/s1600/1-SanFranc_PotreroWhy_Mission.jpg)
Wiring LEDs AND a toggle, that's nto shown int he examples. The fascia controllers Duncan sells jus tplug in and work. It's when trying to figure out an alternate method of usign the device that you are pretty much on your own. I can see why he says "not for beginners" but using the deisnged components together isn t very difficult. I talked to one of the Motrak guys at Timonium, after the Springfield show - he said Duncan was at the Springfield show and cleaned him out of the servo mounts, they've been selling liek hotcakes. I know he's runnign behind these days trying to keep up with demand.
TAM VALLEY OCTOPUS III WITH ROCRAIL TRIAL
Or for $8 you can get 4 of the controllers made for it, with LEDs and a pushbutton.Īfter my first trial Singlet, I had some technical questions before I ordered more, and DUncan promptly answered my email. Take the Mtr jumper off, and wire the SPST toggle switch across pins 1 and 3 of the switch/LED connector. My best guess looking at the wiring examples would be to wire the LEDs as shown in the lower right diagream for two LED indicators.