On Saturday 15 March 2014 06:42:37 Steve Blackmore did opine: > On Fri, 14 Mar 2014 16:23:33 -0400, you wrote: > >Greetings again; > > > >After putting in a diode, that part seemed to work, but this C41 seems > >to have gone south again. (and again (and again)), and its looking > >like a 4th one has failed. Symptoms seem to be an output impedance in > >the 100k region, making 375 rpm maximum, and dropping nearly 100 rpm > >when I put a 10 megohm digital meter on its output to measure it, and > >getting a hair over 5 volts for my trouble, and a fresh LM358 in the > >output voltage follower stage acts exactly like the one I pulled out > >thinking it was bad. > > Very odd - have you spoken to Arturo or emailed him? > > Steve Blackmore
Not recently Steve. He has the attitude that if I modify it, I'm on my own. Said in one of his responses that it was made to run with a pwmgen max frequency of 5hz! 2 or 3 requests for a schematic have been ignored in any replies I have received from Arturo. The mods I've made serve to speed up the response considerably as its so slow out of the bag that a PID controller in front of it just sits there and goes rail to rail at about 2 hz at Pgains above 5. With the mods, its stable at Pgain=40 giving fairly stiff control above 300 rpm. Because he is so unresponsive, I have not attempted to email him about this. I figure if he cared, he would be monitoring the list, but apparently LinuxCNC does not represent enough of his market to be worth it. His loss IMO. I've been effectively been thrown under the bus, so I no longer care. If I can find something else, so much the better. In the meantime I'll continue to troubleshoot it, but it would be many times easier to do IF I had a schematic. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
