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two wire inductive sensor
« on: March 09, 2014, 04:36:10 PM »
Going a bit forward in my Denford Triac conversion to mach3, I've begun to map the different sensors and switches.

As you may know I got the machine already taken apart with all the electronics in one box.
Nevermind that as I'm going to run it of a CSMIO/IP-S which should be in the mail next week or so :)

I've come upon the min/max switches and the reference inductive sensors.
I know of NPN/PNP type three wire sensors, but these are only two wire.

From what I can gather they are ohmic, meaning that contact induces high resistance.
Does that mean that they are not semi-conductive and does anyone know what voltage I can safely operate them on?

Regards,
Jens

Offline Hood

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Re: two wire inductive sensor
« Reply #1 on: March 09, 2014, 05:20:04 PM »
do you have a part number and make for them?
Hood
Re: two wire inductive sensor
« Reply #2 on: March 10, 2014, 01:03:06 PM »
I can't see any part numbers on them, but I assume they have been on the machine from the beginning.

Attached are some pictures of each end.

Don't know if you can see from the color coding what voltage they can take  ???

Regards,
Jens

Offline mc

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Re: two wire inductive sensor
« Reply #3 on: March 10, 2014, 01:32:11 PM »
They're NAMUR output sensors. I don't know why denford used them, but they basically use a low voltage with the resitance changing when triggered - http://www.tektron.ie/namur1.htm

It's far simpler to bin them and fit NPN/PNP sensors instead, rather than try interfacing to them.

Offline Hood

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Re: two wire inductive sensor
« Reply #4 on: March 10, 2014, 03:12:17 PM »
I don't know why denford used them,

Probably to give you a headache if retrofitting ;D

Hood
Re: two wire inductive sensor
« Reply #5 on: March 12, 2014, 08:38:20 AM »
The X-sensor is in a hard-to-reach spot and only half the length of the NPN sensor I've got so I'd rather interface the existing ones.

I've found this topic https://www.machsupport.com/forum/index.php?topic=14981.0 which describes a proxy circuit needed.

I'll test and post the results here if I'm not blown up in the process :)

Regards,
Jens
two wire inductive sensor
« Reply #6 on: March 16, 2014, 03:58:45 PM »
Nothing blew up, but it didn't work with the controller either. I ended up installing NPN sensors I had after all :)

Regards,
Jens


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