Gene, This board appears to use an LM358 bipolar op amp in its output stage. This style of op amp will only swing the output voltage up to about 1.5 volts below the supply voltage, so regardless of the opto coupler performance you will not get 12 volts out while running on a 12 volt supply. Indeed the output voltage range claimed for the C41 is only 0 to 10 volts. It may go to 12 volts out if powered by 15 volts assuming the output amplifier is set up to allow a gain greater than one to be applied to the filtered PWM signal. Keep in mind that the power source for this board must be isolated from other supplies in the system because it may be floating at line voltage depending on the motor driver being used.
Steve Stallings > -----Original Message----- > From: Gene Heskett [mailto:ghesk...@wdtv.com] > Sent: Sunday, May 26, 2013 3:25 PM > To: 'Enhanced Machine Controller (EMC)' > Subject: [Emc-users] C41 spindle controller question? > > Greetings; > > Has anyone reverse drawn a schematic for the cnc4pc C41 > spindle controller? > > For some strange reason I am only getting about 8 volts P-P > out of the > LVT847 optoisolator, whereas I was under the impression it > should be a > nearly 12 volt P-P swing at that point. Board input 12 volt is 11.89 > volts. > > This 1HP motors controller needs a full 12 volts for wide > open. So I'm > only getting about 750 revs in high back gear, 300 in low range. > > Thanks all. > > 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) > My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! > My views > <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> > THE DAILY PLANET > > SUPERMAN SAVES DESSERT! > Plans to "Eat it later" > A pen in the hand of this president is far more > dangerous than 200 million guns in the hands of > law-abiding citizens. > > -------------------------------------------------------------- > ---------------- > Try New Relic Now & We'll Send You this Cool Shirt > New Relic is the only SaaS-based application performance > monitoring service > that delivers powerful full stack analytics. Optimize and monitor your > browser, app, & servers with just a few lines of code. Try New Relic > and get this awesome Nerd Life shirt! > http://p.sf.net/sfu/newrelic_d2d_may > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
