Jeshua Lacock wrote: > On May 26, 2012, at 9:49 AM, Jon Elson wrote: > >> Does this position change show up on the LinuxCNC DRO display, or are >> you reading >> it with a mechanical indicator? >> > > Yes, it shows up on the DRO and the machine physically moves. So I guess they > agree. > Oh, well, now, that is a bit different. If the position display correctly reads the current position, then the positioning loop is not correcting a movement of the system, which it SHOULD be doing. If the servo tuning is good, this should not be happening. If a change in position is fed back to the PID, it should send steps to the drive to correct the position.
> The problem is the power wires are really close given their position on the > Gecko terminals. The drive in question has all 3 Gecko power lines running > right under it. I think this might be the problem. > The encoder signals to the Gecko drive are opto-isolated from the encoder. the encoder feeds the Gecko interface board and the universal stepper board directly. The Gecko interface makes an opto-isolated copy of these signals for the Gecko drive. While you may show continuity of the grounds, the signals are actually galvanically isolated. > Here is a pic of inside my enclosure: > > <http://3DTOPO.com/CNC-enclosure.png> > > Don't judge me too harshly, I was making sure everything works before I > finish tiding things up! Any suggestions would be greatly appreciated! > Umm, yeah, this has power and signal wires running all over the place. Some better routing may help. Twisting the motor wires and maybe the DC supply wires may help, somebody suggested that. > OK, so that should be the PSU DC ground then? Or the earthen ground? > The power supply ground would be best, to return currents back to where they came from. Jon ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
