Here is our ground wiring.. (lower left hand corner of box. - yes it is messy)
http://electronicsam.com/images/KandT/conversion/groundwiring.jpg sam On Sat, 15 Oct 2011 12:21:01 -0400 gene heskett <ghesk...@wdtv.com> wrote: > On Saturday, October 15, 2011 12:12:40 PM Bruce Klawiter did opine: > > > Trying to get rid of spikes, see image 8 here: > > https://sites.google.com/site/bmklawt/home/pid-tuning > > > > See the jitter here: http://www.youtube.com/user/bmklawt > > > > >Probably not the root cause of the problem, but you might try > > >commenting out all the backlash statements in your ini file. > > > > < > > Tried this, no change > > < > > > > >OK, well, this is looking like there is a problem in the servo amps. > > >Maybe > > > > you need to check the + and - 15 Volts, or whatever the servo amps use > > > > >as the supply for their op-amps. Capacitors may have > > > > deteriorated and there is >noise on these supplies.. > > > > I checked this it has +15 volts and -15.2 volts, I don't know how to > > check for noise < > > > > >Possibly you have grounded a circuit that should not be grounded to the > > >>machine's common ground. > > > > Grounding > > problem has been mentioned a lot, I always assumed ground was ground, > > everything in the control is grounded to the chassis. It is pretty much > > as it was originally. I have a crude schematic here, maybe someone can > > find the problem: > > https://sites.google.com/site/bmklawt/home/control-schematic > > > > >Another > > > > thought is that the logic signal that enables the servo amps is not > > being >held at the right voltage, so the servo amps are right on the > > edge of >enabling/disabling. This can cause a transient every time > > the amp enables that >causes it to jump.. > > > > How would I check this? > > > > >polarity of the signals is important. The command input "SIG" is on J1 > > >Pin 2. The > > > > signal common, for tach, command and anything else is J1 Pin 4. J1 Pin > > 4 >needs to be connected to the ground of the DAC board. > > > > Well I am sure this is right if it is backwards the servos run away > > > > >If the connections are right, then I'd suggest running a big ground > > >wire from the >servo amp chassis to the PPMC. > > > > Did this, no change > > > > >On the power supply that feeds the amps, is its output common grounded > > >to something? And does the motor return line come back directly to the > > >power supply common, without connecting to anything else along the way? > > > > Well there is two power supplies going to the amps so I am > > confused, please see the schematic here > > https://sites.google.com/site/bmklawt/home/control-schematic > > I don't know were the motor return line is > > > I think you will have to find it. There has been a discussion of grounding > here on this list just in the last 2 weeks or so, which your drawing isn't > complete enough to tell if its right or wrong. Basically, everyplace your > drawing shows as going to ground should go there on its own wire, and they > should meet at one common bolt. There shouldn't be a measurable path to > this bolt from any wire that has been disconnected from this bolt, it is > the center of the 'star'. Any other ground will make a 'ground loop' and > the circulating currents will develop voltages that can mess with the > servo's. This could even call for remounting power supplies so they are > isolated from the mounting if they are internally grounded. > > > Your help is greatly appreciate > > ------------------------------------------------------------------------ > > ------ All the data continuously generated in your IT infrastructure > > contains a definitive record of customers, application performance, > > security threats, fraudulent activity and more. Splunk takes this data > > and makes sense of it. Business sense. IT sense. Common sense. > > http://p.sf.net/sfu/splunk-d2d-oct > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > 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) > Pilfering Treasury property is paticularly dangerous: big thieves are > ruthless in punishing little thieves. > -- Diogenes > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2d-oct > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
