On Wed, 1 Feb 2017, Dan Bloomquist wrote: > Date: Wed, 1 Feb 2017 16:16:25 -0800 > From: Dan Bloomquist <z...@lakeweb.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Eagle mill retro fit > > > Well, when I thought this was going to go smoothly, I've run into > mysteries. At my age you'd think I know better than to assume. > > I was working out the details of the current wiring to the Anilam. First > surprise, there is no motor tach to the servo amplifiers. They use none > of the PID circuitry on the amp, it is just control voltage in and > motors turn, a simple pulse width modulator. Next surprise is that what > I thought were pulsing tachs on the motor shafts are really DC > generators. I don't see brushes so they must rectify the coil output. > I'll have to take one 'more' apart to confirm. But the signal is clearly > DC as I can spin the handle and get about ten volts plus and minus. So > even more interesting as, 'How do you change the output polarity > depending on which way it is turning?' !! Has anyone seen a setup like > this before? I noticed the date on the console schematics are a couple > of years later than what I think this thing is. The schematic shows what > look like tach feedback to the amps. But absolutely, they are not there > on this machine. > > So I'm wondering just how well the Mesa system could deal with just > glass in and motor voltage out. The Anilam does not bounce or even buzz > on a stopped motor. It just sits locked in place and will fight my turns > on the handle to stay in place as if a brake were set. > > Thanks, Dan. >
The DC generators are the tachometers (they could have no other purpose) the question is how the tachometer generators are connected into the system What are the servo drive part numbers? > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
