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Thread: Peco Electrofrog and Unifrog with Tortoise ? using DC on a DCC layout

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    Default Peco Electrofrog and Unifrog with Tortoise ? using DC on a DCC layout

    I bought a bunch of turnouts, Peco C55 Electrofrog and Unifrogs. I do not have any switch motors yet, but I am leaning towards the tortoise's, though I think in some areas I may need a different design like the MTB MP-1 (if I can find them)

    Anyways, I would like to run my switches analog through DC. A simple switch board with toggle switches. My question is how do I switch polarity with the tortoise switches if power isn't coming from the DCC busline?

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    For Tortoise switch machines, there are contacts on the switch machine that can be used for switching the frog polarity. These are the middle pins, 2-7. They are completely independent from the power supplied on pins 1 and 8. The switches can be used for DC, DCC, AC, whatever. (probably don't want to use them to switch you cable TV connections. )

    The MTB MP-1 is available through Model Railroad Control Systems.
    Tim Rumph
    Modeling the Southern Railway in N-Scale

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    There are several options. I built a "real" power supply using a center-tapped AC transformer, electrical box, voltage regulator, diodes, and a slo blo circuit breaker. This supplies +9v on one lead and -9v on the other with the center lead as common. Then for each Tortoise I have a SPDT switch wired so that the center terminal goes to the Tortoise common to give the Tortoise driver contacts either 9v + or - depending on which way the switch is thrown.
    Alternative A is two 9vdc wall warts with the appropriate outputs wired to the Tortoise common and the others wired to the SPDTs, which obviates the need for an electrical box and circuit breaker. This requires two electrical outlets though, but wiring can be thru a simple terminal block and you still have a SPDT for each Tortoise.
    Alternative B is a single 9vdc wall wart with a DPDT for each Tortoise, which is a bit more expensive and more soldering per switch/Tortoise.
    Multiply the Tortoise stall amps by your number of Tortoises to determine the amperage you need. IIRC 1 amp will power something like 50 Tortoises.
    You don't really need 9v, 6 will work, but I wouldn't go higher than 9.

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    So the power going into the Tortoise does not have to be from the DCC busline for the polarity switch to work?
    @NtheBasement, I think I'm going to need a degree to decipher what you wrote haha. Why are most power supplies 12V for this stuff? Isn't DCC 12-15v anyways? I'm confused.

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    ss454,
    Here is .pdf file that will clear up some of your questions.

    doug
    Attached Files Attached Files

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    Quote Originally Posted by SluderD View Post
    ss454,
    Here is .pdf file that will clear up some of your questions.

    doug
    Would you happen to know if the 36-250-04 DPDT switch is On/On, On/Off/On, or On/Off?

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    Quote Originally Posted by SS454 View Post
    I'm confused.
    Sorry, thought the question was about how to power the Tortoise motor thru a switch. Powering the frog from one of the Tortoise's two SPDTs is the same for DC as for DCC.

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    ss454,
    I use on-off-on on my layout. Having said that a on-on switch will also work. The Tortoise are a stall type of device so continuous power will not harm them.
    Doug

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