I looked at the spec sheet for the BOB. They use a weird set of pins for the step and dir signals. I had a customer two weeks ago with a similar setup and had the same symptoms. We could not get the axis to step correctly when using control line pins (14, 15 ,16, 17, 1)for step and direction. I only got the thing to work when I swapped functions out until I had all the step and dir signals driven by the 8 bidirectional I/O lines (2,3,4,5,6,7,8,9). I am not saying that this is your problem, I am saying that my experience with this kind of pin configuration has not been very happy. It is certainly not conventional. Note: Experience determines convention.
On 2013/09/22 10:34 AM, Gregg Eshelman wrote: > On Sun, 9/22/13, Marius Liebenberg <mar...@mastercut.co.za> wrote: > > Subject: Re: [Emc-users] Very weird thing with my stepper motors. They > don't like to be moved while running. > To: emc-users@lists.sourceforge.net > Date: Sunday, September 22, 2013, 1:49 AM > > It sounds like you have the step and > dir swapped. You could movement but > very erratic in one direction. Those drives are pretty good > and reliable. Signals must be active low. Strap all the + > terminals to 5v and then pull low with your BOB. > > --------------- > > Here's a link to the BOB manual. > http://www.tecnoflexo.com.br/site/fotos/download/17/17.pdf Scroll down to the > picture, X axis is the upper right connector, terminals left to right are > enable, step, direction and ground. Same for the other four axes. > > I unplugged the enable connector from the drive, left the wires connected to > the plug because I jumpered all the - lines together at the drive and the - > enable line is the one I connected to the ground terminal for X axis. This is > the bit of useful info I wasn't able to find anywhere for this BOB. "Don't > use the enable line because it doesn't effing work right!" The LED for each > axis is nice, lets you know that something should be happening. > > NOW the motor will go both directions. Still has the "motion sickness". When > doing the test run there seems to be a bit of a pulsing harmonic in the > motor. Not rough and loud like when one coil is wired backwards but it > vibrates everything on the table. > > I bought 30 feet of 18 gauge four conductor cable to use for the control > lines and for the power wires to the motors. For the test I have the short > motor wires connected directly to the drive and a foot of the four conductor > cable from the BOB to the drive. Interference amongst the control wires? Will > it be a problem for the power wires? I also got 10 feet of two conductor > cable to use for DC from the 60 volt power supplies to the drives. > > Guess I'll have to mount one to the table and see if moving axially while > firmly constrained radially will keep it working. Might be something to do > with the latency that gets over 15,000? That test has showed it over 20,000 > at times. I have another couple of PCs I can try to see if they have lower > latency. Pentium 4 boxes faster than the 1ghz P3 I'm testing with. > > Need to find or make some 14mm female to 5/8" male shaft adapter/extenders to > mount the motor pulleys first before I can try actually driving the table. > > ------------------------------------------------------------------------------ > LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! > 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint > 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes > Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/22/13. > http://pubads.g.doubleclick.net/gampad/clk?id=64545871&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 130921-0, 2013/09/21 Tested on: 2013/09/22 11:07:46 AM avast! - copyright (c) 1988-2013 AVAST Software. http://www.avast.com ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/22/13. http://pubads.g.doubleclick.net/gampad/clk?id=64545871&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
