On 07/13/2016 03:49 PM, Gene Heskett wrote: > On Wednesday 13 July 2016 15:57:38 Leonardo Marsaglia wrote: > >> Hello Jon. >> >> Well, the encoders that are already installed on one of our machines >> are labelled with the Index pulse. The thing is I can't read the pulse >> with halscope for example. >> > I don't think halscope is going to catch it unless you have it running in > free roll and are turning the motor/encoder slowly by hand. You can > either watch it with a good 200 Mhz digital scope, or some breakout > boards have led tally's that I have found to be handier than sliced > bread or bottled beer, you just turn the motor very slowly while > watching the leds. > >> I just tried to use the home using only index pulse and apparently the >> index pulse is working because the axis latches until it stops and it >> turns always a single turn more or less eyeballing it. >> >> The strange thing is I that I can't trigger the scope with the index >> pulse on LinuxCNC, and also I can't measure the index on my other >> encoders. I guess I should try to wire them to a LinuxCNC pc and make >> home manually to see if they work ok. >> >> 2016-07-13 14:29 GMT-03:00 Jon Elson <[email protected]>: >>> On 07/13/2016 08:56 AM, Leonardo Marsaglia wrote: >>>> Hello to all. >>>> >>>> We just tested some Heindenhain encoders and as happened with >>>> other encoders we can't sense the index pulse. We tried to detect >>>> it with a 20 nano seconds period on a digital scope but nothing >>>> happens. All the other pulses are working perfect except the index >>>> one. >>>> >>>> I have to mention that this happened with other encoders too, but >>>> since >>> we >>> >>>> didn't need to use them with index pulse on the other machines we >>>> just >>> let >>> >>>> it that way and didn't worry about it. >>> Well, if the scope does not trigger on it, and it triggers >>> fine on the A and B, then it just isn't there! >>> Now, of course, the index will only happen once per rev, so >>> you have to make a full turn to see the pulse. >>> Are you SURE these encoders actually have the index pulse? >>> >>> Jon
In desperation and lacking a scope I would try logic. Set a FF and use it to drive an LED. Should work rather nicely for slow speeds like hand turning the encoder. I'm sure the logic guru's will have even better suggestions but this should do the job. Dave >>> >>> -------------------------------------------------------------------- >>> ---------- What NetFlow Analyzer can do for you? Monitors network >>> bandwidth and traffic >>> patterns at an interface-level. Reveals which users, apps, and >>> protocols are >>> consuming the most bandwidth. Provides multi-vendor support for >>> NetFlow, J-Flow, sFlow and other flows. Make informed decisions >>> using capacity planning >>> reports.http://sdm.link/zohodev2dev >>> _______________________________________________ >>> Emc-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/emc-users > > Cheers, Gene Heskett ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports.http://sdm.link/zohodev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
