> On 03/26/2016 03:47 AM, Nicklas Karlsson wrote: > > > > I guess this signal both equal also could work for other cases like > > connector problem but these signals are usually not available in linuxcnc > > so it is not possible to care about them at this level. > > > > > If one sensor on an encoder were to fail, then it would > appear to just be dithering back and forth over a small > distance, less than 4 encoder counts. So, comparing the > absolute value of encoder to tach would detect that as > well. So, broken wire, failed detector, failed bulb, broken > encoder shaft or disc would all be detected by this method. > The comparing the complementary outputs would detect most > broken wire cases as well as burned out light bulb. > > Since A-B was used on some really LARGE machines, safety did > become pretty important. > > Jon
Tacho is not always availablew but a velocity output would work equally well except maybe with less accuracy. Then moving I expect there would be a following error at least for almost all cases although then machining in x-y directions or milling in z-direction the other axis are at a standstill. The problem is then at standstill or very close then a small error within following limit integrate the output it become an explosive growth in output signal. Nicklas Karlsson ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785351&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
