On Sunday 29 December 2019 05:19:20 andrew beck wrote: > Hey Andy > > I am just going through all the replies now. > > So what I think happened is I put like 300 volts possibly through the > servo motor. Not just 24 volts. as I had a cheap chinese power > supply that was floating and not tied to ground. It was a big spark > that jumped to the steel and it blew the end of the limit switch wire > to bits and made a big black burn mark on the steel panel. > > I will go and check the insulation before I wire it up. But I think > it should be all good. > > and the brake switching system needs a relay I think. a contact opens > in the drive at whatever timing I set with parameters and that contact > will run another contact cutting the 24 volt power to the brake > solenoid. I wasn't actually using that. I just had the brake locked > open all the time while I was testing. I already had the X and Y axis > working fine and was just connecting up the Z axis when everything > went downhill. > > I am getting confused between the different methods of tying the > various powersupplies to the frame ground, so I have made a drawing > here which explains how I think I should be wiring this control panel. > If you just have a look at this I think it might simplify things. > link to drawing on google drive > <https://drive.google.com/file/d/1rJYzUGXLrSKuDARQ878wc5RlkjgPqSCr/vie >w?usp=sharing> > > > Remembering that I have 400 volts three phase power here in New > Zealand and 240 volts single phase. Which you can make by taking a > one of the three phases and the neutral wire. > > here is the servo drive manual. It is not perfect and is more of a > general manual so if it looks wrong it probably is. But then I just > ask Bill on whatsapp what to do and he asks the engineers. > > yuhai servo drive manual > <https://drive.google.com/file/d/17inZoRboGQP3lqn0KHd343NlmDQ1CxzS/vie >w?usp=sharing> . > > Regards Andrew > > On Thu, Dec 26, 2019 at 11:53 PM Andy Pugh <bodge...@gmail.com> wrote: > > > On 26 Dec 2019, at 06:49, andrew beck <andrewbeck0...@gmail.com> > > > wrote: > > > > > > That meant that the brake actually had a lot more than 24 volts in > > > it relative to machine earth(like 200v I am guessing, it was a big > > > bang!) > > > > That shouldn’t normally matter. I would be very surprised if the > > brake winging insulation wasn’t good for 24V. > > > > I think you should check the brake, make sure that it isn’t leaky. > > Does your electrician have an insulation tester? > > > > Is frame ground also a zero-volt reference for logic and field > > wiring? You sound to be using the terms semi-interchangeably. > > > > What is the brake switching device in the drive?
You missed a static (green) ground on the x drive, and you need to add a 4th wire from that green box (aka your common bolt) back to the static ground in the service entrance. Heavy enough that an insulation failure will clear that fuse w/o damaging the wire. 4 wire cordage, or better yet TW of a suitable gauge in conduit. Haveing 480 3 phase in that box is a lethal scenario. But you knew that. You show fuses, but I'd have an external three phase breaker you can padlock in the off position and the only key in YOUR or the electricians pocket before touching anything in that box. I lost a friend in Iron Mountain MI whose $dayjob was as an overhead crane operator delivering hot iron from the furnace to the casting floor in an iron foundry. The cranes control pendant had 480 in the handpiece and had shorted to the box. Touching it and the 2nd floor railing, his normal work location was the last thing he did. > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
