Viesturs pirmd., 2020. g. 30. nov., plkst. 22:57 — lietotājs Peter C. Wallace (<[email protected]>) rakstīja: > > On Mon, 30 Nov 2020, Viesturs L?cis wrote: > > > Date: Mon, 30 Nov 2020 22:35:21 +0200 > > From: "[UTF-8] Viesturs L?cis" <[email protected]> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <[email protected]> > > To: "Enhanced Machine Controller (EMC)" <[email protected]> > > Subject: [Emc-users] Faulty THCAD board? 7i96 error? Advice needed! Was: > > Plasma config with Telwin plasma source > > > > Nex problem with THCAD card is that if I fire the plasma and it > > creates the arc, encoder velocity decreases. Yes, it gets smaller. > > Approximate value is 96 for that particular torch height I have set. I > > watched both velocity and position pins of the encoder module. > > Position pin was increasing, so the pulses were still coming and it > > was not a glitch of a "frozen" value at velocity pin. > > My way of circumventing this is negative value for thc.scale_offset > > parameter. Then with negative encoder velocity value, which is > > decreasing as the plasma starts and negative offset I get positive > > voltage value in THC module. > > > Not sure what you are saying, I would expect the plasma voltage to > decrease once the arc is established (compared to the higher open circuit > voltage) >
With encoder scale 31.25 and THCAD board set to 1/32 I would expect encoder velocity of 120.5 with 0V on THCAD inputs, given the calibration sticker says 120.5kHz at 0V, 961.5kHz at 300V (I have 300V version) And that is exactly what I get. The thing that I do not understand, is why does encoder velocity _decrease_ if I apply some voltage to THCAD inputs. I am now playing with PlasmaC component. I have set encoder_scale to -1 and here is what I get: encoder velocity = 740 at 0V input (tried both versions - unconnected and short-connected both inputs) encoder velocity = 560 at 5V input encoder velocity = 250 at 12V input Why is the value decreasing when input voltage gets higher? > > > And then there is a minor problem with 7i96 board: > > https://www.picpasteplus.com/v.php?i=f609e19c95 > > This indicates either poor latency in the host or lost communication with the > 7I96. You might go through the standard latency reducing steps on the PC > (disabling power management/speed switching,EIST,C states >C1 etc etc) > Also if you have a Intel Ethernet chip on your PC you need to disable > IRQ coalescing as described in the hm2_eth manual page > Ok, I must be dumb or something like close to that. My effort about disabling irq coalescing gets me "Cannot get device coalesce setting. Operation not supported" What else is there to turn off? https://upload.picpaste.me/image/6rrEA https://upload.picpaste.me/image/6roIV https://upload.picpaste.me/image/6ryBQ https://upload.picpaste.me/image/6rdGH https://upload.picpaste.me/image/6r4SM https://upload.picpaste.me/image/6r9bU https://upload.picpaste.me/image/6rDcs https://upload.picpaste.me/image/6rpkB https://upload.picpaste.me/image/6dIW2 https://upload.picpaste.me/image/6dhuS https://upload.picpaste.me/image/6dLIo When I ping the 7i96 board, I get response times of 0,3-0,4 ms. Is that OK? Viesturs _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
