Mesa 7i76E and NKS E3000C Spindle Wiring Configuration Help

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31 Oct 2022 16:52 #255586 by cakeslob

Yes, you can use the ENA and DIR OPTO outputs if you change
the drives input common to +24V (if that's what you meant)

I have all the other driver inputs connected to the 7i76 outputs, like alarm reset and stuff, all connected with a common GND. So Im wondering if I change common to 24v+, will I still be able to use the other driver inputs?

Are you saying that the index output is an open collector output
like that shown in Fig. 30? It should be possible to use that outpu
with the encoder index input if that input is jumpered for TTL mode.


Yeah, its not really an encoder, but "rotating pulse" output pin from the driver. This issue is that it is 24v pin, so I dont know if I can do it.

I am having a lot of trouble with almost every pin, even though it looks straight forward.

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31 Oct 2022 17:44 - 31 Oct 2022 17:52 #255591 by PCW
No, the inputs need a 0V common if you are driving them with 7I76 field outputs

If the rotating pulse output is like those shown in figure 30 you
should be able to connect it directly to the 7I76 encoder index input
(its an open collector output, no 24V involved)
You would need to connect the drives output 0V pin (18) to the 7I76 encoder ground
and jumper the encoder index input for TTL mode (the encoder inputs have a built in
2K pullup to 5V so will work with open collector drivers)
Last edit: 31 Oct 2022 17:52 by PCW. Reason: sp/format

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31 Oct 2022 18:55 #255595 by cakeslob
Ok thanks PCW. Right now I have DIR ENA connected to some regular mesa outputs and I have those outputs linked in hal to the mesa DIR ENA, that was how I managed to get it working up till now.
If you have any suggestions on how I could get it going nicely Im all ears. I was thinking like maybe I need a....transistor or something.....

Thank you for your help, the rotational pulse pin was easier than I though.


One last question about hooking up the driver.

 

I am trying to connect my driver analog feedback (fig 32) to the analog pins on the 7i76. When I connect the spindle speed out analog, and the spindle feedback analog to the mesa, I get interference and it sends the wrong speed to the spindle driver.

Is there something I can do about this? like a filter capacitor or something?
I wanted access to the spindle torque feedback, so I am open to suggestions.

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31 Oct 2022 19:02 #255596 by PCW
There is no connection from the analog out (which is full isolated)
to the analog inputs but VFDs are often very noisy so a common mode
choke on the monitoring signal and signal common may help.

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31 Oct 2022 20:43 #255609 by cakeslob
Ok, thanks PCW Ill looking into common mode chokes (which look fancier than ferrite beads)
Both the signals work individually, and at the same time, checking with multimeter, but when I plug the ribbon cable into the mesa when both are connected, it the spindle makes an audible different noise, and the RPM reading on the driver is has around 100-250rpm difference than what I commanded. The feedback signal will still be correct, but the output is a lower reading. Im using an IDC26 pin ribbon cable if that makes a difference.

Thank you for all your help, your patience is appreciated as well.

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