Just adding a filter may not help unless you add it correctly. My recommendation is that you follow the best practices guide referenced by John Thornton. On Jan 22, 2016 3:56 PM, "Dave Cole" <linuxcncro...@gmail.com> wrote:
> Are you using decent filters?? > > GS1 and GS2 drives tend to pump a lot of RF noise up the power supply line. > I've used the AD filters with good success. I think the one I used was > about $80. > If you are using cheap Ebay filters.... sometimes you get what you pay > for. > > Have you put a scope on your AC lines to see if the filters are > effective?? I suspect they are not. > Re-routing your drive to motor leads is also sometimes effective. Keep > them as far away from low voltage wiring as possible. > > Dave > > On 1/22/2016 12:51 PM, Jim Craig wrote: > > Hey all, > > > > I have been troubleshooting some noise that I have on my servo encoders. > > I have isolated the noise source to be the 1/4hp Automation Direct GS1 > > VFD that I have running my coolant pump. If the coolant pump is not > > running then there is no noise on the encoders and the machine maintains > > correct positioning. If I turn the coolant pump on then the encoders get > > false signal that in turn changes where the machine thinks it is. This > > problem showed up immediately after I retrofitted the machine this last > > summer. I have just now been able to diagnose where the issue is > > originating. > > > > In attempts to improve the situation I have done the following. > > Installed EMI filters on the supply lines to both the coolant and > > spindle vfds. > > worked on ground system to try to isolate the noise. > > rerouted the coolant pump motor power cable completely away from > > any other cables and completely away from the machine. > > > > All of these things have failed to improve the noise issue. > > > > I also tried the following to try and diagnose the issue. I disconnected > > the coolant pump motor cable from the coolant pump vfd. Disconnected the > > spindle motor from the spindle vfd. Connected the coolant pump to the > > spindle vfd. Note that the spindle vfd is a 3.0hp Automation direct GS2 > > drive. > > > > When I did this and ran the coolant pump via the spindle vfd there was > > no noise on the encoders. > > > > Does anyone have any ideas on how to get rid of this issue. I really > > want to make some parts but I can't with the noise issue. > > > > I talked to a EE buddy of mine and he mentioned running both motors > > (spindle and coolant pump) off the same 3.0hp GS2 drive just to get me > > going. What do you think about this? Will running two different sized > > motors on the same VFD cause any issue. Right now I don't run my spindle > > in reverse so I would not have any trouble with the coolant pump running > > backwards. > > > > I talked to Automation Direct and they said that the GS1 is more prone > > to noise than the GS2. I am contemplating getting a 1/2hp GS2 to replace > > the GS1. > > > > So frustrated right now. > > > > Let me know if you have any ideas. > > > > Thanks, > > > > Jim > > > > > ------------------------------------------------------------------------------ > > Site24x7 APM Insight: Get Deep Visibility into Application Performance > > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > > Monitor end-to-end web transactions and take corrective actions now > > Troubleshoot faster and improve end-user experience. Signup Now! > > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
