> On Sunday 27 December 2015 18:03:20 Ben Potter wrote: > > I have to admit I'm curious how industrial 4th axes are set up - I > > presume an extended ground pin at a minimum - or do they need a full > > power down of the machine too?
> A full power down of that motors driver will suffice. Its safe to power up the driver while the motor is disconnected, and when it is connected, but the intermittent connections of unplugging it while the driver is powered up will > write a ~30~ to that drivers story a very large percentage of the time. > I killed a xylotex board twice with bad connectors. Connector name starts with an M. Sorry Gene, I may not have been clear enough - My (crude) 4th axis - which is due to machine a better 4th axis this week uses this method. The complete machine needs to power down and be left alone long enough for the DC bus to discharge. It's not bad, and keeps me going, but I keep thinking 'there's gotta be a better way'. I was wondering if the big machine builders had come up with a hotplug solution. My brain has been saying extended ground pin plus a resistor across two pins - the drive would need to detect the correct resistance before powering up. The big concern for me is how fast would the drive need to power down in a disconnect situation. I do hitting things with a hammer, this electronic stuff is a bit arcane for me. In the back of my brain may also be the thought of 'how do I make this toolpost grinder into a safely switchable tool'. At least that one is fairly low power Thanks Ben ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
