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Author Topic: NPN Proxy switch help  (Read 5107 times)

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Offline Graham Waterworth

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NPN Proxy switch help
« on: November 19, 2006, 08:25:41 AM »
Hi All,

This Boxford I am converting has NPN proxy switches for homing, they work at 24VDC black and brown are power and blue is signal.

My question is this can I connect them direct to an input or do I need to convert the signal in some way?

Thanks
Graham.
Without engineers the world stops

Offline Chaoticone

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Re: NPN Proxy switch help
« Reply #1 on: November 19, 2006, 09:54:23 AM »
Hello Graham,
    No, you need to separate the voltages. My board has optoisolated inputs and outputs.
Here is how Mr. Duncan of CNC4PC explains it.
An optoisolator is an integrated circuit that transmits the signal through an encapsulated LED and
phototransistor. When the signal is on, the LED lights up, the phototransistor captures it and
relays the signal. In that way, your computer’s electronics are completely isolated from your
circuitry. The signals are transmitted through light and not through physical connections. In
this way, a power surge has no way of reaching your computer.

Quote
black and brown are power and blue is signal.

I've never seen a 24V prox. that the signal is blue. I do not know if this is a set in stone standard or not. I have replaced a blue million switches, different manufacturers, styles, etc. The signal has been black on all of these. Blue=neg. brown=pos. black=signal.

Hope this helps. ;D
Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

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Offline Chaoticone

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Re: NPN Proxy switch help
« Reply #2 on: November 19, 2006, 09:58:34 AM »
I also meant to tell you that most 24V DC switches will operate on 8V DC and you can get a cheap power supply that has 5V DC and 12V DC. I think I gave about $20.00 for mine.
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Graham Waterworth

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Re: NPN Proxy switch help
« Reply #3 on: November 19, 2006, 11:28:40 AM »
Hi Brett,

I have just traced a wire back and the part number is Efector IEB-3001-ANOG

The symbols on it show BN=+ BK=- BU=-/- (looks like a switch)

Its not the power supply side thats a problem its the input to mach break out board that i am not clear on.  do I connect it direct to an input or do i need to add some other electronics so the 5 volt input is not blown.

Graham.


« Last Edit: November 19, 2006, 11:41:08 AM by Graham Waterworth »
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Offline Chaoticone

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Re: NPN Proxy switch help
« Reply #4 on: November 19, 2006, 03:43:36 PM »
Hey Graham,
     It depends on your breakout board. The prox. is going to send a signal at the voltage it is powered (24V). You do not want to send that to the PC. What kind of breakout board do you have? Any manuals?

I will try to look that part# up tonight and get the pinout.
 
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Graham Waterworth

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Re: NPN Proxy switch help
« Reply #5 on: November 19, 2006, 04:50:46 PM »
Hi Brett,

I have found this pdf of the prox

Graham.
Without engineers the world stops

Offline Chaoticone

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Re: NPN Proxy switch help
« Reply #6 on: November 19, 2006, 05:34:40 PM »
Hey Graham,
     Yes, black is the signal wire on this prox. I thought it was. We use a lot of Efectors. Good, one little thing out of the way. :)
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Graham Waterworth

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Re: NPN Proxy switch help
« Reply #7 on: November 19, 2006, 05:51:22 PM »
Hi Brett,

This is the board I am using.

Graham.
Without engineers the world stops