Ok, so the principle is: What goes in must come out. It goes in via the mains cable, but at the moment it comes out into thin air around the signal cable (or whatever it is) that picks up / radiates the noise. (It is the same really for this excersize) So whatabout forcing the interference to come out the same way it came in: i.e. the mains cable. We do that by forcing the sum of the currents in the L+N+E to be equal at all times, so get hold of a biggish ferrite or even better powder ring core and loop the mains cable through as many times as will fit.
Alternativily there might be inductive coupling between the inductor in the light and the transformer in the UPS. that should be curable by moving the UPS as far away as possible from the light. Interference goes down relating to the square of the distance. But at this moment I am putting my bets on the copper wire. Have fun j. On Sun, Oct 16, 2011 at 10:02 PM, Andy Ibbotson <andyi_w...@btinternet.com>wrote: > Follow up... > > Disconnected the UPS from the 240V mains and system is not affected by > lights starting. Also, when reconnected the only thing that make the > motors > jump are the lights even the compressor is ok - ignore my comment above. > -------------------------------------------------- > From: "Andy Ibbotson" <andyi_w...@btinternet.com> > Sent: Sunday, October 16, 2011 7:32 PM > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] OT EMC on control signal > > > Wow! thanks for all your help! BF30 build thread is here > > > > Gene, > > Shop lights are in metal cases and worst light does have two goes at > > coming on. Machine jumps even with lights that start first time though. > > > > Regarding the PSU and 7i43 I have to admit that I'm not sure which ground > > to connect where :-o > > At present the 7i43, BoB and signal side of the Geckos are powered by the > > PC PSU, i.e. 5V and GND. > > > > The power side of the system (42V, 12A or so) comes from a transformer, > > bridge rect and a big capacitor (100ms soft start on trans), the 0V from > > the transformer is not connected to either earth (mains 240V) or GND from > > the PC. > > > > Mains earth is connected to the controller chassis and controller and PC > > are physically separate. > > > > The power transformer 0V is connected to the power side of the Geckos and > > to the motor cable screens. > > > > Karl, > > Good idea I'll give it a try. > > > > Peter, > > Unfortunately the Gecko's are 201's and have common ground, 201V can be > > referenced to 0V or better 5V. > > > > Kirk, > > This looks like a very similar problem, I also note that the motors jump > > when I switch on my compressor but are ok when the much lower power > flood > > coolant motor is switched on I have a line filter somewhere, I'll give > it > > a try. > > > > Regards > > Andy > > > > > > > > > > -------------------------------------------------- > > From: "gene heskett" <ghesk...@wdtv.com> > > Sent: Sunday, October 16, 2011 4:26 PM > > To: <emc-users@lists.sourceforge.net> > > Subject: Re: [Emc-users] OT EMC on control signal > > > >> On Sunday, October 16, 2011 11:13:08 AM Andy Ibbotson did opine: > >> > >>> Hi > >>> I have my BF30 up and running EMC2 but I'm having problems with EMC > >>> noise. When I switch on the shop fluorescent lights they cause the > >>> motors to "jump" anyone got any advice re. shielding. All signal cable > >>> screens are grounded to the 7i43 (PC) ground. Link to Control box from > >>> PC is by a 1m bought 25Dsub cable. Motor power wires are 4core > >>> screened cables, screens are at PSU ground (isolated from Geckos and > >>> PC). Any help or advice will be appreciated. > >> > >> Are the shop lights sheet metal parts well grounded? > >> > >> Or said another way, is the rapid start a bit slow? If a slow starter, > >> does it start instantly when you reach up and touch the lamp? All > >> symptoms > >> of poorly grounded fixtures. > >> > >> If not well grounded, their startup voltages could possibly radiate. > >> Most > >> of those depend on a well grounded housing in order to start rapidly, > and > >> is often the reason the lamps are fitted so close to the sheet metal. > >> Stand them out another cm from the sheet metal and that ballast may not > >> be > >> able to start them. > >> > >> That PSU ground should probably be tied at the 7i43 ground, if not that > >> could make an entry point for noise. > >> > >>> Machine is in the UK. > >>> Regards > >>> Andy > >> > >> Cheers, Gene > >> -- > >> "There are four boxes to be used in defense of liberty: > >> soap, ballot, jury, and ammo. Please use in that order." > >> -Ed Howdershelt (Author) > >> <dark> Culus: Building a five-meter-high replica of the Empire State > >> Building with paperclips is impressive. Doing it blindfolded is > >> eleet. > >> > ------------------------------------------------------------------------------ > >> All the data continuously generated in your IT infrastructure contains a > >> definitive record of customers, application performance, security > >> threats, fraudulent activity and more. Splunk takes this data and makes > >> sense of it. Business sense. IT sense. Common sense. > >> http://p.sf.net/sfu/splunk-d2d-oct > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > > All the data continuously generated in your IT infrastructure contains a > > definitive record of customers, application performance, security > > threats, fraudulent activity and more. Splunk takes this data and makes > > sense of it. Business sense. IT sense. Common sense. > > http://p.sf.net/sfu/splunk-d2d-oct > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2d-oct > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
