On Thu, 21 May 2020, andy pugh wrote:
Date: Thu, 21 May 2020 02:33:16 +0100 From: andy pugh <bodge...@gmail.com> Reply-To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] mesa 7i76 spindle encoder not counting suddenlyOn Thu, 21 May 2020 at 02:22, andrew beck <andrewbeck0...@gmail.com> wrote:
I read a post you made while ago saying that the 5v and 24v powersupplies need to be within a certain threshold to work well. or else they need to be commoned together
This is really a question for PCW. I think that they need to be within 12 (17?) volts to work.
There should be no substantial common mode voltage. That is the quadrature source and the 7I76E must have a common ground.
The input common mode range on the 7I76E encoder input is -7 to +12V you can easily exceed this (and even damage the reciever chip) if the source and 7I76E do not have a common grouns
so if I test between the 7i76 mesa 24 field power ground ( this is the same power as the servo drive control power) and the logic 0v on 7i76 I should get close to 0v is that correct?
The important thing is that the difference between + and - is a couple of volts or so (positive or negative) and in both states the difference between each input and 7i76 gnd is <12V (or possibly 17, the number is in the manual)
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