Hi Gene, I'm afraid the technical details are above my pay grade. I can however help you with Mesa cards that relate to Linuxcnc.
My 5i25 http://mesaus.com/index.php?route=product/product&path=62&product_id=51 I also have a C1 and a C1G and a pile of optos for them I'd be very willing to part with. Let me know what you need. JT On 9/8/2016 4:59 PM, Gene Heskett wrote: > Greetings Peter; > > Someone made the remark a while back that it was indeed possible to look > at the output of a function, in this case the first pwmgen of a 5i25 > with the prob-rfx2 firmware in it. > > I've had a blowup, the ultimate cause of which I have not found yet, but > from the damages done to the cnc4pc C1G BoB that I have found so far, I > am inclined to think the spindle motor psu, or possibly something line > powered failed. The C1G damages so far found are 1 blown 74ACT245N, and > an almost invisible use of a ground trace on the pcb as a fuse. All the > opto's in my spindle encoder would appear to have failed. Those I have > a bag of, but that pcb makes the tinfoil of a pack of smokes look like > boiler plate, so I'll have something I won't call fun replaceing them. > > I can run the x/z motors just fine, but the limit switches would appear > to be closed as those leds are at full britness when its several inches > from the switches. > > What happened is that I had started a short program that called for a 400 > rpm spindle but had neglected to engage the headstocks back gear, so the > motor took off and wound out to max speed before I could hit the big red > button. And about 1/2 second before my hand hit the button, there was a > pop that came from the box over the spindle motor and everything coasted > to a stop. The pop sounded like it could have been the top of one of > the hexfets on the Pico Systems PWM-servo amp I am driving the motor > with. But they look pristine, and all the other components in that box > look good and a DVM says they are properly powered. Thinking the motor > may have thrown a winding, I've looked it over and checked for shorts > and come up empty so far. > > Back to the 5i25 question. So I fire up the halscope and send it to > gpio1.in or in_not. And try to start the spindle from axis with the > cable to the bob unplugged. > > I am seeing a short pulse of 1 volt p-p, which becomes inverted if I look > at the in_not, and trying to increase its speed has no effect. So its > beginning to look as if I may have blown this 5i25. And I've still no > clue what did it. > > Do you concur, Peter? In that event, I'll need three more, with low > profile brackets as I believe the one I was going to run either my toy > mill, or this Sheldon lathe, has a bad pin that I was using for the > probe, G38.2, and it got flaky. That was because the big dummy I can > see in the mirror here forgot to run a decent ground to the frame of my > G0704. And it was pretty darned noisy when I put a scope on it. Fixed, > but too late for that 5i25. So now I need one for the little monster, > one for the Sheldon, and one for my toy mill that I've not found a round > tuit to do yet. > > Thanks Peter, or John T. > > Cheers, Gene Heskett ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
