On 7 February 2010 22:22, richard harris <[email protected]> wrote:
> I then ran it three times with the coolant and spindle running and witnessed > two thousands of motion lost over the three runs. However Halmeter showed > the same number of encoder counts. Sorry, I only just noticed that this account had gone dormant, and so have not been receiving EMC mail for a few days. I had a problem with noisy encoder signals with the spindle VFD running. I didn't do a full step-by-step analysis but the problem went away with: 1) Braided shielded motor cables, grounded at the VFD end to the terminal suggested by the manufacturer. The cables have a dedicated earth/ground wire and I made sure this was well connected at both ends. I have plugs and relays in my 3-phase VFD output runs, and I used the earth wire to bridge the gaps in the shielding through these parts. (rightly or wrongly) 2) A filter on the input to the VFD. This prevents noise transmission back down the lines, and emission from the input cables. I bought mine from eBay for not very much. 3) Ferrites on the output wires from the VFD. Just a ferrite bead for each cable, looped through twice. -- atp ------------------------------------------------------------------------------ SOLARIS 10 is the OS for Data Centers - provides features such as DTrace, Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW http://p.sf.net/sfu/solaris-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
