On 20.07.17 08:39, dave wrote: > A few weeks ago when I was having motion problems someone suggested I check > the supply voltage > to the encoder. It turns out to be 4.8 V. The power supply was an 85 w pico > , the little card that plugs > into the 24 pin power connector. Thinking that maybe I could do better with > a standard power supply > I swapped in a 300+ watt supply. Measured the encoder supply voltage and it > is 4.82 V. > System is using 5i20/7i33. > Is that voltage likely to cause problems? > TIA
That is 3.6% low, well within tolerance for all adequately engineered 5v electronics. But you never know if an encoder might become marginal on e.g. quadrature prematurely as the voltage diminishes. If the power supply also has a +12v output, you could hook up a 7805 or similar, with e.g. 330 nF caps to ground directly on input and output, to provide the 5v for the encoder. It might not even need a heatsink if the encoder is not too greedy. But measure its output too, as it may also only put out 4.8v and still be within tolerance. A schottky diode in the ground leg would in that case up the voltage to maybe 5.1 - 5.3, still within tolerance, but providing more headroom for the encoder electronics. Erik ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
