Greetings all; I am up2date on the pi a/o this morning. So my first question is:
Does the code I'm running have the latest commits from the work on the encoder, or is that strictly benefitting the software stepping crowd? In any event, it seriously needs help. I hooked up the analog scope so I could look at the waveforms and timings right out of the encoder, and with the motor being driven at 60.8Hz, the waveforms are within 2% of equal timings, and the overall speed wibblies are no worse than 2 or 3%, with excellent quadrature. But if I hook up the halscope, the apparent quadrature error is worthless due to the 1KHz servo-loop timing limiting the bandwidth. I may add a bit of math to measure the loop time to see if there is something usefull there, because while I am seeing at worst, a 4% time wobble on the screen of my hitachi 1065, doing a capture with a minmax shows the huge below figures. I fired up the minmax, set it for 60 hz, to the motor, reset the minmax to start at a steady motor speed and at 30 minutes run time I had logged a minimum of 269.9784 rpm's, and a maximum of 444.8399 rpms. No way in hell the spindle speed was wobbling that much I left it running while I went out and rounded up some din-din and fed us, but I must have had a blast of noise because after we had eaten, the halmeters showed -1527449 rpms and 525176.6, so I have work to do yet on the grounding. Humm, I can't recall if I put the vfd's control cable ground under the ground bolt nut, or if it was just dropped over the bolt, but I'd bet a cuppa caffeine its loose. First thing I check tomorrow. Looking at the halscope, the 1khz sample is a mess. Is there a way I can process the velocity data by treating it to the time between samples so its reduced if the last full cycle was longer, or amplified if the last full cycle was shorter?, therefore leveling the differences in velocity caused by the timing variations? Seeing a good +-2% waveform on the analog scope while seeing a quad noise bar on the halscope thats just short of 50% of the dc the noise is sitting on, says the encoder signal from the 7i90 needs help, or the 7i90's encoder itself needs help. How best to proceed? Cheers, Gene Heskett -- "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> ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
