Proximity Sensor Wiring Issue? Help needed. - Page 4


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Thread: Proximity Sensor Wiring Issue? Help needed.

  1. #37
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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    I would test with a meter to verify as that seems to be your original concern. I think on your bob both 12v neg and 5v neg are tied together. On boards that I use I keep them isolated



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    What should the meter measure across the wires?



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    if you must connect multiple normally closed NPN sensors to one BOB input this is one possible solution

    Proximity Sensor Wiring Issue? Help needed.-npn-sensor-one-bob-input-jpg

    John



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    you should see 12.xx on the meter with red meter probe connected to brown and black meter probe connected to blue wires of the sensor . when the axis is off the home position and led lit you should measure less than 1 volt across(Blue) GND and (Black) PIN 12 terminal on the BOB this should measure the same for all sensors and there associated input pin



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    Quote Originally Posted by john-100 View Post
    if you must connect multiple normally closed NPN sensors to one BOB input this is one possible solution



    John
    Hmm that seems a little complicated but I guess I understand the wiring and the components.

    I was thinking something like this, but since none suggested it, I guess it cannot work like this?


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    Quote Originally Posted by sparkness View Post
    you should see 12.xx on the meter with red meter probe connected to brown and black meter probe connected to blue wires of the sensor . when the axis is off the home position and led lit you should measure less than 1 volt across GND and PIN 12 terminal on the BOB this should measure the same for all sensors and there associated input pin
    Great. I will test it next time.

    Attached Thumbnails Attached Thumbnails Proximity Sensor Wiring Issue? Help needed.-npn-sensor-one-bob-input-jpg  


  6. #42
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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    another NPN sensor adaptor

    Proximity Sensor Wiring Issue? Help needed.-74hc05-adaptor-jpg


    you can not connect NPN sensors in series

    but you can connect normally closed PNP sensors

    Proximity Sensor Wiring Issue? Help needed.-pnp-sensor-one-bob-input-jpg

    John



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    Cool.
    I could also just use simple NC switches as limits and be done with it.



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    Quote Originally Posted by coherent View Post
    If this is already standard knowledge then my apologies... Standard proximity switch wiring is brown V+, blue V- & black signal It depends on your sensor voltage ratings but for example if you have a NPN NO sensor that operates on 10 to 30 volts and are using 12v to the brown V+ and have connected the blue to V-/ground... the black signal wire will output 12v (or whatever 10v-30v voltage is supplied to the V+ brown wire) when no signal is detected. When the sensor detects metal the signal wire voltage drops to zero (or close to zero). Most breakout boards are opto isolated from the parallel port which is their typical purpose and have built in pull up/pull down resistors for the input pin signals but, if your breakout board cannot accept a signal voltage greater than 5v at it's input pins, you need to use resistors and make a simple voltage divider to drop the signal wire voltage to 5 volts. Some breakout boards can accept 12v or 24v at the input pins which make things easier. The reason the sensors don't all use lower voltages is the higher voltages are less susceptible to noise causing signal issues. If your sensors have a resistor built in them, then you need to measure the built in resistors resistance and then add the appropriate size resistors so that combined the total drops the voltage to the appropriate voltage that your BoB can accept at the input pins.

    Man you're right on this. I got roko sn04 npn-no 5-36v rating, the sensor alway out 5v pull from ess-c25, and the signal wire to Bob won't engage, because sensor 5v doesn't drop continue open... really frustrating till now I still haven't figure out yet, if you have a chance please help me. Or I might have to buy pnp-NC sensor.



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

    is this how you connected the sensor and ESS-C25 ?

    Proximity Sensor Wiring Issue? Help needed.-npn-sensor-plus-c25r3-input-jpg

    what is supply voltage connected to the SN04N ?

    and what is the value of the pullup resistor you used ?


    John



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    I using the meanwell 5v/2.0a, to power the ess, and sn04N pull the power straight from ess-c25 bob terminal keep it simple I think it all 5v.
    I brought the resistors kit from amazon it have majority of size, because I don't know resistor ohm laws =( no club about electronic stuff, really need some training =D
    as you see in the image my sn04n always powered led without touch the metal plate. Im frustrated almost two weeks now, i can't solve the problem.


    Proximity Sensor Wiring Issue? Help needed.-20181108_202627-jpg
    Proximity Sensor Wiring Issue? Help needed.-20181108_202640-jpg
    Proximity Sensor Wiring Issue? Help needed.-20181102_191248-jpg
    Proximity Sensor Wiring Issue? Help needed.-20170827_201210-jpg
    Proximity Sensor Wiring Issue? Help needed.-20181102_191226-jpg



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    after a quick search for the SN04N data sheet I only found one in chinese !!

    the one thing I could read is the sensors supply should be between 10 to 30V

    Proximity Sensor Wiring Issue? Help needed.-sn04n-data-sheet-jpg

    from your photos I can not see what pull up resistor you have fitted (if any)

    if your sensors do work with a 5V supply
    I would reduce the pullup to 100ohms

    Proximity Sensor Wiring Issue? Help needed.-5v-npn-sensor-plus-motion-controller-jpg



    John



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    Default Re: Proximity Sensor Wiring Issue? Help needed.

    I check all 3wires from sn04-n with multimeter to find internal ohm,
    brown (+vdc) & blue (gnd) = 13.27k ohm
    black (input) & blue (gnd) = 23.2k ohm
    brown (-vdc) & black (input)= 9.95k ohm
    ==========================================================================

    HOLLY SH thank you man. after I add 100 ohm to Brown and black wires sensor home switch work... it triggered. I went check the current between blue and black with sensor triggered got 110vdc why ?
    how do you know 100ohm can i make the trigger volt lower?


    Lmao I ordered 3x pnp-nc other day before I checked this reply, I didn't know the one I got right now it actually still work, after you help me. man I really appreciated for the help bro. I guess pnp-nc for limit when it arrive.

    Last edited by Nleo22; 11-10-2018 at 09:15 PM.


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Proximity Sensor Wiring Issue? Help needed.

Proximity Sensor Wiring Issue? Help needed.