if the scales were dirty expect the sensors to be covered in "stuff" too thus blinding them.
You could scope the power supply too make sure it is a clean 5v and that all cables are ok and scope the signals to see which are clean and which are faulty. if you had the sensors apart have you reset the phase between A and B Dave Caroline On 08/01/2014, Peter Blodow <p.blo...@dreki.de> wrote: > Gentlemen, > > a little off topic, sorry: A 3 axis system of above type was given to me > because of beginning irregularities. As it turned out, all three axis > displays are working, but mostly show irreproducible numbers, i.e., when > pushing a glass rule slider forward and back again to the same position, > the display does by far not return to the start value or what's worse, > the direction of movement is not even always detected correctly. The > sensors were well covered with grease and sticky. I cleaned all three > carefully with alcohol but it made no difference exept that I get no > greasy fingers any more. The electronics unit seems to be ok, too, > probably no noise affair or so. All three channels going crazy in the > same manner point to a common source. > > The device itself is probably rather ancient, but the manual from FAGOR > is still available on the internet though apparently for newer models. > > It looks like the glass measures are functioning just like rotary > encoders with ground and +5V, A, B and I channels. The index home > position is indicated on the outside by a mark. > > My suspicion is that the infrared LED's in the sensors have lost power > so the electronic counters don't get all the pulses from the sensors > anymore. I know this decaying phenomenon from other long term > performance or high power LED applications such as CD burners and > refrigerator indicators. And as I know how workshops run, machine > readouts are never turned off because they usually don't have a separate > switch or the workers care the heck, so anyway, they get a lot of hours. > Replacing the infrared LED's would be tricky, but relatively easy if it > were worth wile. > > Can you imagine that my suspicion is right? Does anyone of you have > experienced a DRO behaving crazy in this manner without a recognizeable > reason, and has anyone repaired one (successfully ;-)? > > Thanks in advance from > > Peter Blodow > Ehrenberg, Bavaria > > > ------------------------------------------------------------------------------ > Rapidly troubleshoot problems before they affect your business. Most IT > organizations don't have a clear picture of how application performance > affects their revenue. With AppDynamics, you get 100% visibility into your > Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics > Pro! > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
