DPDT switch question

Discussion in 'FAQs' started by psocks, Dec 30, 2004.

  1. psocks

    psocks New Member

    1 2

    3 4

    5 6

    Using the example above as guidance I need to make sure this is right. I have 1 transformer available to me. I want to make “dead” sections on my track ( basically the spurs) that I can park one train in and still run a second train on the remaining “live” track. I will need to insulate each section I want to be able to turn off or on. I will also need to wire each of these selectable areas to a DPDT. A DPDT that has an on/off. I would wire each DPDT as follows:

    Track gets wired to 1 and 2. Powerpack goes to 3 and 4. 5 and 6 get nothing. Is this correct?? Thanks a million :thumb: :thumb:
  2. pomperaugrr

    pomperaugrr Member

    I would wire these differently. I would have #3 and 4 be the feeds to the track. Power from the power supply would go to #1 and 2. This way when the switch is flipped, it will either send or cut power to the track, depending upon switch position.

  3. psocks

    psocks New Member

    Okay sounds good. With this approach I assume you could do as many "dead" lines as you want correct? Since you only need to have the spurs turned on when you want to move the train on the track. And I guess the biggest thing is to ensure you have the correct polarity on all sections of track.
  4. pomperaugrr

    pomperaugrr Member

    That is correct. You could also add another throttle to #5 and 6, to be able to use different throttles in an electrical block. For this, I would suggest using DPDT with "center off." That way, you could cut power to a block by setting the toggle switch to the center off position, then choose between throttle A and B by flipping the switch to either "on" position. If you have not yet purchased the switches and only have one throttle for now, go for the "center off" switches. These will allow you to add a second throttle in the future, with minimal wiring. That will let you have one power pack operate the train on the mainline, while having a switcher work your yard or spurs. Just keep the tracks isolated electrically, to avoid shorts. It is really much easier than it sounds.

    #1 and 2: Throttle A
    #5 and 6: Throttle B
    #3 and 4: Feeds to track

    With a center off DPDT, flip one way, Throttle A controls track. The other way, Throttle B controls the track. Move switch to center position, kills power to track

  5. Pitchwife

    Pitchwife Dreamer

    An alternate method wouuld be to run

    #1 & 2 to one block of track
    #5 & 6 to an adjoining or other block of track
    #3 and 4: to your throttle

    Then you can move your train from one block to another using the same throttle
  6. CalFlash

    CalFlash Member

    How would you run continuously from 1 block to another with this wiring scheme? Pomperaugrr's recommendation makes the most sense.
  7. grumbeast

    grumbeast Member

    I use Eric's method and have about 15 isolated sections and two throttles. This is what I understand to be called cab-control. It works really well (in fact I've double isolated each block (cut both tracks) and have DC on Throttle A and DCC on throttle B because I've only just started converting my loco's

    It is important to get the centre-off DPDT switches for this to work properly

    One work of advise if doing a whole layout this way, you probably need less sections than you think I'm re-wiring my layout at the moment and will probably drop it to 8 sections rather than 15.

  8. grumbeast

    grumbeast Member

    One other caution with running DC /DCC on two seperate cabs. You have to be very careful not to have loco's cross between adjacent isolated sections when they're using different power systems.

  9. Pitchwife

    Pitchwife Dreamer

    It all depends on what kind of operations you are attempting. In my example one track could be a siding and the other be the adjacent mainline. The only drawback to pomperaugrr's setup is if you have each throttle set to different speeds causing the train to speed up or slow down when it passes from one block to the other.

    Gosh! I've almost talked myself into springing for a DCC system. :eek: :eek: :eek: :oops: :oops: :D :D :D
  10. CalFlash

    CalFlash Member

    Ppomperaugrr's setup is simple cab control. You set the swich to the same cab as it progresses around the layout flipping it off as you leave the block. It is this last task (or forgetting to do so :oops: ) that is good justifcation for DCC :thumb:
  11. 60103

    60103 Pooh Bah

    If you are going to run DC and DCC at the same time, you need a protection device. I was told it is to protect the DC power pack.
    An automobile light bulb is the minimum protection, but there is a black boc somewhere that does the job faster.
  12. siderod

    siderod Member

    Little off-topic splurge here, but on my layout if i stuck with DC, i would have got 44-45 shut-off sections (12-track yard and 15-stall roundhouse adds up quickly) but since converting to DCC i'm chunking the blocks together to ease of use and to make the pannel less cluttered...once i go DCC, those 45 blocks will drop down to 8 (10 at most)

    We now return to our previous programed thread already in progress...this has been a test of the siderod blocks his layout emergency test system... **beep**

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