On 09/12/2016 12:43 PM, Gene Heskett wrote: > Greetings all; > > I see by the spec sheet that the allegro 667 gear sensor can sink up to > 25 mills. > > But with 3 such sensors on the end of a long cable back to the breakout > board, probably 7 foot by the time I get it routed, I am concerned with > the potential for crosstalk noise in spite of putting a bypass capacitor > on the encoder itself. Just don't source any more current than you actually need. I have 3 of these on my spindle encoder, the cable is certainly more than 7 feet, and right next to a VFD-powered motor. No problems so far. I have the pull-ups at the sensor end, and they are 1 K Ohm. I do have a .1 uF (or possibly 1 uF) cap across the power at the sensor end junction block, that is maybe 4" from the actual sensors. I used 4-conductor shielded cable, with the shield as the ground return (I know, not best practice, but I didn't have 5-conductor shielded cable).
Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
