what does the rs422-->rs232 convert do exactly? sam On 12/14/2012 2:46 PM, Viesturs Lācis wrote: > 2012/12/14 andy pugh <bodge...@gmail.com>: >> On 14 December 2012 20:19, Viesturs Lācis <viesturs.la...@gmail.com> wrote: >> >>> For example, today I started the system up, all 4 motors had set >>> bldc.value = 0.15; motors 0 and 1 were spinning, 2 and 3 were standing >>> still. I tried to get them spinning too by changing bldc cfg=h and >>> later also to cfg=n. Well, those motors started to turn, but 0 and 1 >>> did not. Even more - turning them by hand did not reflect any change >>> in encoder.0.rawcounts and in encoder.1.rawcounts. >> Were 0 and 1 running on the Hall sensors or on the encoder when they >> were working? > 0 was cfg=h, 1 was cfg=qh; > After both of them stopped responding, I tried also swapping the > motors with no success. > > BTW there is one more unknown thing: > Motors have 1000 CPR encoders. If I turn motor one turn in one > direction, rawcounts pin increments approximately by 4000, if I turn > it one turn in opposite direction, it also increments by different > number (it is changing, mostly in 2000-3000 range). Since both of the > phases are connected to 7i39, it is obviously an error somewhere. I > see 2 possible places: motor itself (I do not trust those chinese > manufacturers) and my rs422-->rs232 convertor board. I made a testing > cable to attach motor directly to 7i39 to bypass my convertor - > eliminating it from the signal path would indicate where the problem > is. The thing is that then LinuxCNC does not report any signal > received at all. The cable was checked and it is ok. >
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