BOB and NPN Proxy Switch wiring question. - Page 2


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  1. #13
    Member coherent's Avatar
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    Default Re: BOB and NPN Proxy Switch wiring question.

    I had issues with NPN proximity switches also. Might have simply been the make/model or specs of mine, but between pull down resistors required etc was just a hassle. As another posted above I used a simple multi channel relay board. It was very easy to hook up and has worked flawlessly.



  2. #14
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    Default Re: BOB and NPN Proxy Switch wiring question.

    Hi Eric

    I missed post 12

    yes
    just connect the E-Stop between the input common and the input pin (15 ?)

    I would use the N/C terminals and set the switch as active high

    that way a broken wire triggers an E-Stop

    John



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    Default

    Will do.

    If I understand correctly, the Proximity switch setup I am going with will be fail safe in the same way since its active high correct?



  4. #16
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    Default Re: BOB and NPN Proxy Switch wiring question.

    Going by the info I found and attached to post 11

    the Proximity switches are normally open (N/O)
    ( the limit switch needs to be set as active low )

    So they would fail to work if a wire went open circuit
    which is very often what happens when wires are repeatable flexed



    John



  5. #17
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    Default Re: BOB and NPN Proxy Switch wiring question.

    Is this why...
    The Limit switch always provides 5v until it is flagged.
    So If the wire breaks (because the BoB already provides a high 5v) there is nothing to bring the input to 0v so there is no logic signal sent?
    But if the board didn't supply 5v and had to get it from the PSwitch sginal wire - then if the wire broke it would drop the voltage, signalling a logical machine stop?

    There's not an alternative way to wire the PSwitch without involving relays, such as polarity swapping BoB hack or something right?



  6. #18
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    Default Re: BOB and NPN Proxy Switch wiring question.

    yes
    looking at the internal circuit of the Proxy Switch from an earlier post ( #8 )

    BOB and NPN Proxy Switch wiring question.-lj12a3_4_z_bx-data-jpg

    the 10K resistor pulls the output up to the +5V supply when the switch is open

    once tripped, the switch closes and grounds the output
    ( the NPN transistor switches on and the output goes down to 0.68V )

    John



  7. #19
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    Default Re: BOB and NPN Proxy Switch wiring question.

    Appreciate all your help John.

    Only my Z Proximity switch wiring moves via wire chain the other axis wiring are statically installed.
    I am hopeful this will greatly reduce the chance of wire break. I still rather have a NC setup.

    Eric



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    Default Re: BOB and NPN Proxy Switch wiring question.

    Just curious,

    Are you using a motion controller with this? I thought cncrouterparts included electronics with their routers.



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BOB and NPN Proxy Switch wiring question.

BOB and NPN Proxy Switch wiring question.

BOB and NPN Proxy Switch wiring question.