On 05/23/2015 07:24 AM, Chris Kelley wrote: > Rick, > > I'm working on a Fanuc spindle that uses that same "encoder" (my motor is a > Model 3 PN: A06B-1003-B100 at 3.7/5.5kW) on a Burgmaster Powerhawk VTC-150. > > It's not actually an encoder but a magnetic pulse generator that reads the > teeth on a gear on the top of the motor. It has six leads: +5V, 0V, PA, RA, > PB, RB. > > +5V and 0V are obviously the power connections. PA is Pulse for phase A, it > outputs a sine wave that goes from about 2.25V to 2.75V (can be less, the > magnets in the read head lose strength over time and put out a weaker > wave). PB is Pulse for phase-B, it is the same as PA but offset 1/4 of a > wavelength (90 degree offset). RA and RB are Reference phase-A and > Reference phase-B respectively. These put out a constant 2.5V signal. All > of these signals tend to be pretty noisy. (Note that the two sine waves are > centered at this same 2.5V.) > > I don't know if the Mesa card can read that sine wave, I'm pretty sure it's > only meant to split digital square waves. > > If the Mesa has differential inputs (pretty sure it does) then it should work fine to read the encoder. Too bad it doesn't have an index channel, too, but this is likely for speed control only, as it may be on the other side of a gearbox from the spindle.
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