7i76e limit switches

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01 Jun 2019 05:03 #135539 by Type_Zero_Design
Im looking to figgure out how to hook up my limit and home switches on my 7i76e. They are NC limit mechanical switches with limits on both ends and a seperate homes for each axis.

I have referenced Norbert wiring guide but I don't think I'm running the same setup since i'm not using proximity switches.?

physically would I just run 24v + to each switch and then to the 7i76e so when its activated it breakes the 24v+ connection so it triggers?

IF anyone can give some insight It would be appreciated.

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01 Jun 2019 08:06 #135546 by rodw
Replied by rodw on topic 7i76e limit switches
Thats the way to do it. You have plenty of inputs so just take +24 V field power though your limit switches to the 7i76e input. Each input has 2 pins internally. You will probably want to use the one ending in -not but a quick play in halshow will sow you the way.
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01 Jun 2019 08:14 #135547 by pl7i92
Replied by pl7i92 on topic 7i76e limit switches
if it is a little bigger mashine you can go better to a
LJ12A3-4-Z/BX induktiver Näherungsschalter Sensor M12 12mm NPN 6-36V

or the pnp version as you have plenty of inputs no need to chain them
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01 Jun 2019 09:56 #135552 by rodw
Replied by rodw on topic 7i76e limit switches

pl7i92 wrote: if it is a little bigger mashine you can go better to a
LJ12A3-4-Z/BX induktiver Näherungsschalter Sensor M12 12mm NPN 6-36V

or the pnp version as you have plenty of inputs no need to chain them


BUt the OP wants to use mechanical switches. There is nothing wrong with that.

Don't use NPN sensors on a 7i76e. You need to add pullup resistors for them to work. Using PNP sensors does not require any additional hardware and is by far the better way to go.

From my experience, I think you need to add current limiting resistors with NPN as I've burnt out a couple until I upgraded to PNP.
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01 Jun 2019 12:48 #135561 by Type_Zero_Design
Thanks guys,

I know most people are using PNP or NPN. But right now I'm working on wiring up this retro switch and it will be much easier to use the switches and wiring that are in place

I think that's what's been confusing me as well is everything I've found for hooking up the switch he's is one of those configurations and it seemed like my understanding for the mechanical switches was just to simple then haha

Hope to test it out this afternoon I appreciate all the help.
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01 Jun 2019 13:00 #135563 by bevins
Replied by bevins on topic 7i76e limit switches

Type_Zero_Design wrote: Im looking to figgure out how to hook up my limit and home switches on my 7i76e. They are NC limit mechanical switches with limits on both ends and a seperate homes for each axis.

I have referenced Norbert wiring guide but I don't think I'm running the same setup since i'm not using proximity switches.?

physically would I just run 24v + to each switch and then to the 7i76e so when its activated it breakes the 24v+ connection so it triggers?

IF anyone can give some insight It would be appreciated.


That's correct. Take +24vdc from field power to one side of the switch. other side (N/C) take back to input on the 7i76E. When you trigger the switch, it opens the circuit. Use the notted input re: input-01-not

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19 Jun 2019 04:11 #137266 by Type_Zero_Design
Hey everyone quick update/question!

First thanks for all the help got the limits working.

Now I've realized that the servo drive inputs are all sinking. Is there any way to get a sinking outputs out of my 7i76e or 7i85?

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19 Jun 2019 14:31 #137290 by PCW
Replied by PCW on topic 7i76e limit switches
Which inputs?
Do you have a drive manual you can post a link to here?

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19 Jun 2019 17:48 #137298 by pl7i92
Replied by pl7i92 on topic 7i76e limit switches
if you want real good ones
search
switch me-8111
there are multiple with different direction detection
but this are rough they can be precise as 0,03mm on repeat
look at ebay or amazon me-8111

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19 Jun 2019 20:11 #137305 by Type_Zero_Design
PCW,

Heres the manual, Page 10 shows the drive connection for the drive in question.
www.machsupport.com/forum/index.php?acti...34955.0;attach=46239

Connector CN1 Is the what I'm trying to figure out. Specifically the servo enable signal. From what I can discern those inputs are switch ground which I cant do with the 7i76E?

Also side note: I noticed in Hall Monitor that there are a few signals that would potentially be used to trigger this; Machine on, Machine ready (which seem to be the same) and then independent xyz enables. What is standard best practice here?

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