How do you splice in limit switches to an existing control.

Discussion in 'General Electronics Chat' started by sky-high-11, May 6, 2015.

  1. sky-high-11

    Thread Starter New Member

    Apr 16, 2015
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    See attached pictures.
    I am building a tubing notcher using a xy table that moves the vise held tube into a stationary rotating hole saw.

    When the saw cuts thru the tubing I want it to trip the limit switch reversing the direction toward the other limit switch which then shuts the feed off making ready for the next tube.

    How do you splice in limit switches to an existing control.

    I have no clue about electrical things so answers should be dummied down.
    Thanks, Rick

    20150423_140912.jpeg 20150423_141012.jpeg 20150423_141023.jpeg 20150428_090949.jpeg P1000273.JPG P1000275.JPG P1000276 2.jpg
     
  2. sky-high-11

    Thread Starter New Member

    Apr 16, 2015
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    Anybody ???????
    Send me elsewhere is ok by me.
    thks Rick
     
  3. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    I think the problem is there really isn't enough information available in your post for anyone to be able to help with specifics.

    Furthermore, it may not be as simple as you imagine because it would be bad for the motor to change direction instantly so you will require an extra step in the middle to allow the motor to stop. It is certainly possible; consider using an inexpensive mini PLC or smart relay to automate the process, this will allow you to easily add some "intelligence" to the control. Use relays to emulate the motor control switch positions (FWD, BRAKE, REV).
     
    Last edited: May 9, 2015
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Patience grasshopper! Do you have a model # of the drive and motor. If not, have you contacted Minarik? https://www.minarikdrives.com/contactus.aspx
    It will likely require at least one DPDT relay in addition to the limit switches. But probably impossible to help with more info.

    Ken
     
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    looks like its a four wires motor, the blue and yellow are forward and reverse, red black dc feed, so you need to interrupt the blue yellow feeds.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    If it is a four wire motor and it is obviously a brushed type, it could be a universal motor.
    Max.
     
  7. ramancini8

    Member

    Jul 18, 2012
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    Spend some money to hire an expert and get a good solution.
     
  8. hajivitra

    New Member

    Apr 7, 2015
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    nice information
    thanks all
    [​IMG]
     
  9. Reloadron

    Active Member

    Jan 15, 2015
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    That is what I would do. You can get a piece of those wires behind the Forward / Reverse switch. Use your limit switches to interrupt those lines for FWD and REV.

    Ton
     
  10. sky-high-11

    Thread Starter New Member

    Apr 16, 2015
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    Great comments, I'll do my some homework and play with the switch.
     
  11. MaxHeadRoom

    Expert

    Jul 18, 2013
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    As in post #3 you may be wise to implement a delay before doing a 'instant' reverse.
    Max.
     
  12. strantor

    AAC Fanatic!

    Oct 3, 2010
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    Note that if interrupting the field wires (blue yel) without also interrupting the armature wires (red black ) the motor will behave as typical for a field loss (runaway high speed).
     
  13. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Although that may not apply if it is a universal motor as at that point the armature circuit will be open.
    Max.
     
  14. strantor

    AAC Fanatic!

    Oct 3, 2010
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    I would make an external circuit which switches the armature polarity so as to avoid field loss. Switching the lower inductance armature will allow faster fwd/Rev switching. Making the circuit external gives you a fall-back option if things don't work as expected : the working DC drive that you haven't tampered with.

    I would use a programmable relay like omron zen or pilz pnoz or similar. Or possibly arduino if cost is a big factor.
     
  15. strantor

    AAC Fanatic!

    Oct 3, 2010
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    I would not expect to see a universal motor used in a positioning application although it can't be ruled out I suppose. I cannot read the name plate. can we get a better hi res pic if the name plate?
     
  16. MaxHeadRoom

    Expert

    Jul 18, 2013
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    If DC shunt motor I would have expected to see some field details on the motor plate, but it is a little hard to read.
    The controller appears to have a single SCR.
    Max.
     
  17. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    can you take a close up of the track side of the pcb where the multi connector is, and also of the motor name plate.
     
  18. sky-high-11

    Thread Starter New Member

    Apr 16, 2015
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    More detailed pics to come when I get the assembly in my hands on Monday 11th.
    Again Thanks for the many suggestions an interest.
    rick
     
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