Proximity Sensor Wiring Issue? Help needed. - Page 2


Page 2 of 4 FirstFirst 1234 LastLast
Results 13 to 24 of 43

Thread: Proximity Sensor Wiring Issue? Help needed.

  1. #13
    Registered
    Join Date
    Mar 2017
    Posts
    129
    Downloads
    0
    Uploads
    0

    Default Re: Proximity Sensor Wiring Issue? Help needed.

    I looked and my sensors today and they have this label.
    Proximity Sensor Wiring Issue? Help needed.-img_20180213_120112-jpg
    So from what I understand they are NPN type but they are wired like this on my BOB.
    Proximity Sensor Wiring Issue? Help needed.-pnp-proximity-sensor-jpg
    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.
    Proximity Sensor Wiring Issue? Help needed.-pnp_en_1-png
    Proximity Sensor Wiring Issue? Help needed.-npn_en_1-png

    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
    Registered
    Join Date
    Dec 2005
    Location
    United States
    Posts
    156
    Downloads
    0
    Uploads
    0

    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 01:47 PM.


  3. #15
    Gold Member john-100's Avatar
    Join Date
    Mar 2007
    Location
    uk
    Posts
    1516
    Downloads
    0
    Uploads
    0

    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 01:48 PM. Reason: add PS


  4. #16
    Registered
    Join Date
    Dec 2005
    Location
    United States
    Posts
    156
    Downloads
    0
    Uploads
    0

    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
    Registered
    Join Date
    Dec 2005
    Location
    United States
    Posts
    156
    Downloads
    0
    Uploads
    0

    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



  6. #18
    Registered
    Join Date
    Dec 2005
    Location
    United States
    Posts
    156
    Downloads
    0
    Uploads
    0

    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  


  7. #19
    Registered
    Join Date
    Mar 2017
    Posts
    129
    Downloads
    0
    Uploads
    0

    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
    Registered
    Join Date
    Dec 2005
    Location
    United States
    Posts
    156
    Downloads
    0
    Uploads
    0

    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



  9. #21
    Registered
    Join Date
    Mar 2017
    Posts
    129
    Downloads
    0
    Uploads
    0

    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?



  10. #22
    Registered
    Join Date
    Dec 2005
    Location
    United States
    Posts
    156
    Downloads
    0
    Uploads
    0

    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
    Gold Member john-100's Avatar
    Join Date
    Mar 2007
    Location
    uk
    Posts
    1516
    Downloads
    0
    Uploads
    0

    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



  12. #24
    Registered
    Join Date
    Mar 2017
    Posts
    129
    Downloads
    0
    Uploads
    0

    Default Re: Proximity Sensor Wiring Issue? Help needed.

    Got it. Thanks for the explanation



Page 2 of 4 FirstFirst 1234 LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Proximity Sensor Wiring Issue? Help needed.
Proximity Sensor Wiring Issue? Help needed.