2012/1/31 Tom Easterday <[email protected]>: > > Do you have differential drivers for the encoders or are you running them > single ended?
Single ended. > I would put the encoder signals on an oscilloscope and see what they look >like to the controller. Since I do not have oscilloscope, it seems like HAL Scope would be the only option. But can I see A and B inputs of encoder module on 5i23 card? > Or, it could be noise introduced into your signal driving the motors (rather > than the encoders). > That was an issue we ran into on the Plasma gantry table and > had to design some custom filters to deal with it. I have retrofitted plasma table and IMHO in terms of generating noise the plasma is from totally different league. Client wanted to control the machine - jog the table and run/pause/stop g-code file - with usb joypad. I set them up with that option, but I know that pretty soon they removed the joypad, because plasma was disturbing the joypad. There are 4 wire leads for each motor - 3 phases and GND. I have packed leads for each motor in a separate socket. I do have power cable for spindle running along other cables, wrapped in aluminum foil and grounded at one end , plus the spindle was not turned on, when I tried to tune servos. So I do not see any source for noise in motor power cables. Plus I suppose the oscilloscope is the only way to check it. 2012/1/31 dave <[email protected]>: > I also assume you use a star grounding system for your encoder > and signal cables. Yes. 2012/1/31 Roland Jollivet <[email protected]>: > > Most CAT5 cable is solid single strand, not good for installing on machines > or in vibrating environment. But maybe yours is multi-strand? Yes - they are multi-strand, but I called them "flexible" as I did not know the right word :) It took me some time to find those cables, because I was looking for shielded multistrand cables with at least 6 leads. I do have diy converters from single ended to differential signal. It was used to convert step and dir signals for 3 drives to differential signal. I could use them to get differential signal. But would it make sense not to have differential to single ended signal decoder and feed in 7i39 only half of the differential signal? Viesturs ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
