Proximity Sensor Wiring Issue? Help needed. - Page 2


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Thread: Proximity Sensor Wiring Issue? Help needed.

  1. #13
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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    I looked and my sensors today and they have this label.

    So from what I understand they are NPN type but they are wired like this on my BOB.

    Almost the same as in my case except that my blue cable goes to the load bob terminal instead of -12v and common terminal on my bob is connected with -12v.


    But from what I see on those pictures it seems to be correct in my case.



    Attached Thumbnails Attached Thumbnails Proximity Sensor Wiring Issue? Help needed.-img_20180213_120112-jpg   Proximity Sensor Wiring Issue? Help needed.-pnp-proximity-sensor-jpg   Proximity Sensor Wiring Issue? Help needed.-pnp_en_1-png   Proximity Sensor Wiring Issue? Help needed.-npn_en_1-png  



  2. #14
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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    based on the picture with the label attached. The+12V connect to the Brown . 0V or ground connects to the Blue and the input to the BOB connects to the Black wire of the sensor , this is an NPN sensor. Black is the sensor output ,Brown and Blue power the sensor, In your original wiring diagram you show 2 black wires coming out of the sensor, and the Black wire coming out of the sensor should connect to pin 12

    Last edited by sparkness; 02-13-2018 at 12:47 PM.


  3. #15
    Gold Member john-100's Avatar
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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    the wire link I added to the BOB was to connect the missing +5V supply to pin 14 of the 74HC14 IC used to buffer the 5 BOB inputs

    Proximity Sensor Wiring Issue? Help needed.-chinese-bob-74hc14-5v-pins-jpg

    now I have looked at the photo of the proximity switch label
    I have changed the colour of the wiring to match the colour of the sensor wires

    Proximity Sensor Wiring Issue? Help needed.-proximity-sensor-wiring-v3-jpg

    with the mains earth/ground connected to the spindle to protect you from a possible shock due to a fault in the motor or the cable

    you could have a problem due to an earth loop as the BOB's ground terminals are connected to the the mains earth /ground via the PC's power supply

    the addition of an opto-isolator to the touch probe is one solution

    John

    PS
    example of ready made opto-isolator board

    Proximity Sensor Wiring Issue? Help needed.-example-ready-made-opto-isolator-board-jpg

    Last edited by john-100; 02-13-2018 at 12:48 PM. Reason: add PS


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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    that looks correct now, many of the proximity sensors wire this way. Brown to +V Blue to -V or Gnd. Black is the switched output



  5. #17
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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    that looks correct now, many of the proximity sensors wire this way. Brown to +V Blue to -V or Gnd. Black is the switched output



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    some of those ebay Chinese BOB's have opto inputs

    Attached Thumbnails Attached Thumbnails Proximity Sensor Wiring Issue? Help needed.-mach3-bob-opto-jpg  


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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    Thanks for the help guys.
    At the moment I do not have issues with my probe. Since I added the capacitor everything works fine.
    About the connection of pin 14 to +5v, my knowledge in electronics is limited so I do not understand what means that inputs are buffered. What is the difference of buffered inputs vs non buffered?



  8. #20
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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    it means your input signal connects to a buffer before it goes to the parallel port .non buffered means you connect directly you the parallel port. the buffer in your case is a the 74hxx chip which acts as a unity amplifier



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    Hmm and what purpose does the buffer serve? Does it have something to do with noise filtering or something like that?



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    it can provide additional output and clean up the signal , it is a simple amplifier . it cannot isolate like an opto



  11. #23
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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    this is part of the circuit diagram of your BOB

    note - this shows only one of the five identical input circuits
    also note the missing +5V supply to pin 14
    Proximity Sensor Wiring Issue? Help needed.-chinese-breakout-board-input-circuit-jpg

    the 74HC14 used is a Hex inverting Schmitt trigger

    when the input is at +5v the output is at 0V and vise versa

    having the schmitt trigger input it also sharpens up slowly changing signals so they have sharp edges

    so they are seen as a logic 0(0v) or logic 1 (+5v) not some vague level between 2V & 3V


    the 74HC14 has 6 inverting Schmitt trigger circuits inside
    Proximity Sensor Wiring Issue? Help needed.-7414-jpg

    john



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    Got it. Thanks for the explanation



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Proximity Sensor Wiring Issue? Help needed.

Proximity Sensor Wiring Issue? Help needed.