On Thu, 2007-10-18 at 00:17 -0400, Jim Coleman wrote: > > On 10/18/07, Jon Elson <[EMAIL PROTECTED]> wrote: > Kirk Wallace wrote: > > Thanks again Jon and Chris. What should have been obvious > turns ... snip > interference sources like motor-VFD cables and any other that > might have 120 or 240 VAC on them. > > Jon > > > in my hitachi seiki manual, it says that twisted pair wire should be > used for the encoders. not sure if this would help eliminate noise in > your situation or not.
I used the existing cable which has four shielded twisted pairs. I have one pair for each A, B, I and power. > also what about an inductor or capacitor at the encoder in its power > line to help smooth any noise introduced there? I have a short run between my encoder and a differential driver. I am wondering about whether I should have some sort of filters on the high impedance inputs of the driver. The thing is that with 50k pulses at 3,000 I'm not sure how much of a filter I could use. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
