PBX-USB and NPN Inductive Prox switches for limits

PBX-USB and NPN Inductive Prox switches for limits

Postby wsoeldner » 01 Apr 2012, 14:32

I have a V90 which I've converted to CNC-USB (cooked my parallel
interface that came with it and decided to go USB on this one) with the
PBX-USB.

I am getting ready to install my new limit switches and this is what is
giving me pause. I have NPN inductive proximity switches (Blue, Black,
Brown wires). Everything I am finding to include planet-CNCs diagram
with opto islolators tells me to do the following. I'm scared to
pump 12V into my card though… is the following correct?

proximity.png
proximity.png (11.36 KiB) Viewed 8219 times


BROWN is connected to +12V (I'm using the 12V feed in the casing),
then there is sensor, then there is a 1K resistor connected to one of
the LIMIT+ on the board.
BLACK is connected to GND pin on the board next to my LIMIT switch pin
BLUE is connected to the main GROUNDING bus in my case.

These are the sensors I have: Inductive Proximity Sensor Detection Switch NPN DC6-36V LJ12A3-4-Z/BX Voltage: DC 6-36V

Warren
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby adiaz » 03 Apr 2012, 11:41

Hello I am new to the forum. Your diagram is wrong.
You have two options, "A" and "B" are both valid. "B" with the opto-isolator can reduce electrical noise.

Detector Inductivo.jpg
Connection Limit switch with inductive sensor.
Detector Inductivo.jpg (15.56 KiB) Viewed 8177 times
Last edited by adiaz on 06 Apr 2012, 15:32, edited 3 times in total.
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby wsoeldner » 05 Apr 2012, 13:45

Thank you Alberto. Thank you for the correction.

The final answer I need is whether the PBX-USB can accept the 12V as in the diagram. Do you know if it does? I am very worried about burning out my card again.

Warren
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby adiaz » 05 Apr 2012, 20:37

Do not worry you will not burn anything, this is tested on more machines and it works perfectly.

Check your connections my diagram "A" or "B" before connecting the power.

Of these forms "A" or "B" you are not getting 12volts to the PBX (cnc-usb).
In the option "A" just share the connection of "GND" (0volts), no problem.
In the option "B" the power of 12volts is completely separate (electrically isolated) from the PBX (cnc-usb).
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby wsoeldner » 05 Apr 2012, 23:37

OK. And if I understand correctly, there is no need for a pull-up resistor in diagram A?

Warren
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby wsoeldner » 06 Apr 2012, 17:38

Ouch... something blew. I connected one of the switches to the X+ as per diagram A. It was working fine and the it and then at one point as soon as the CNC-USB software loaded, a pop, and burning smell.
My case fan no longer works and it appears that the R2 (102) may be cooked. I compared it's resistance to a few other like resistors on the board and its very different. It is also darker than the other Resistors. No fuses seem blown.

Probotix still hasn't answered any of my emails regarding the proximity switches so I see very little chance they will be of any help. I guess I'm stuck buying a third card. Not too happy right now about buying a third board from trying to get these limit switches installed.
http://i274.photobucket.com/albums/jj267/wsoeldner/Forums%20and%20Posts/848b8dcd.jpg
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby Andrej » 07 Apr 2012, 12:29

Are you sure you have NPN switches?
Did you connected correct wires?
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby wsoeldner » 07 Apr 2012, 14:27

Yes, they say NPN right on them, and I connected exactly as the diagram showed.
I pulled the 12V off of the board side of the fuse on the circuit that plugs into the card and provides power to the fan to test it though. now that I think about it, I am wondering if that was my error. I believe once the software booted and started to initialize the hardware, it overloaded circuit.
Before everything blew, the sensor LED was on and if I moved it near metal it brightened up.

I'm contemplating how I can remove that surface mount resistor and replace it with a regular resistor.
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby Andrej » 07 Apr 2012, 18:34

Replace SMD resistor with another SMD resistor. Don't mess with TH.
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby adiaz » 08 Apr 2012, 10:03

I want to help you, the problem is not my diagram.
You can take three things:
1 st- You have connected something wrong, I repeat in writing:

Inductive sensor (NPN) black wire to X- (pcb probotix)
brown wire to +12 VDC (positive power supply)
blue wire to - 0Vdc (negative-GND power supply) and GND (pcb probotix)

PCB probotix: X- to black wire (inductive sensor)
GND to blue wire (inductive sensor) and - 0Vdc (negative-GND power supply)

2 nd- You inductive sensor is not correct. (PNP or push-pull)

3 th- Have the power supply connected to something else?

You specified as the power supply connected to other things, make me a picture or diagram.
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby wsoeldner » 21 Apr 2012, 13:48

Sorry for the delay everyone.
I don't have the skill or tools available to mess with SMD resistors right now. I sucked it up and bought a Mark2/4 and optocouplers. I'll go that route and see what happens. Thanks for all your help.
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Re: PBX-USB and NPN Inductive Prox switches for limits

Postby Support » 27 May 2016, 11:18

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