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Proximity Sensor for Z End Stop

Posted by Flyer2 
Proximity Sensor for Z End Stop
March 07, 2017 03:35PM
I have a Rambo that I'm changing end stops on. Right now I have a mechanical y stop, opto x and I'm trying to set up a LJ12A3-4-Z/BY orange tip proximity sensor for Z min. X and Y work fine. When I try homing the Z axis the probe triggers and the printer completely stops. I can't move any axis in any direction. Also, when the Z triggers I can't get it to retract 2mm and do a final homing. I run the M119 code and it's in L state, than trip it and it goes to H state. I've changed the pullup setting, inversed it and tried everything else I can think of. Also chose electronic end stop NO.
It's wired as brown=+, blue=- and black=signal. I'm taking 12v off the psu and am just running the black signal wire to the Z min connection. I ordered a blue tip sensor as well and wired it with 10k and 15k resistors and still have the same issues.
Any help would be greatly appreciated.
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Edited 1 time(s). Last edit at 03/07/2017 04:53PM by Flyer2.
Re: Proximity Sensor for Z End Stop
March 08, 2017 09:49AM


connect the probe as in the image.
With a PNP NO probe you will need to dissable the controller Z pullup resistor
Re: Proximity Sensor for Z End Stop
March 09, 2017 02:23PM
Thank you for the suggestions.
I believe the schematic you show is for the blue tip BX sensor. Although I have one that is wired as you show it affects my printer more than the orange tip. It makes the Z axis move in the wrong direction and won't home at all. Again, I've changed the pullup settings (enable/disable), Z axis direction, etc and nothing works.
I come closer to having the Z stop work with the orange tip BY sensor. Like I stated, I've changed pullup settings, inversed the probe, done everything I can think of. Enabling the Z probe is just for tramming, right? Although that is my ultimate goal I want to get it functioning as a simple end stop first.
Any other ideas?

Edited 1 time(s). Last edit at 03/10/2017 08:13AM by Flyer2.
Re: Proximity Sensor for Z End Stop
March 20, 2017 12:26PM
If anyone else is having a similar issue the solution for me was to add a L7805 voltage regulator to the probe. I've only seen it required for the blue tip BX sensor but it took care of my problem with the orange BY sensor.
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