On 09/01/2015 07:12 AM, andy pugh wrote: > > I think that Fanuc is another option, but I don't know how to > differentiate between the various Fanuc encoding and commutation > schemes. > There are two basic forms of Fanuc red-cap encoders. The original red cap had standard differential quadrature plus index, and a proprietary 4-channel commutation code. I have converters that make this look like standard Hall sensors.
The newer scheme is serial. Some have absolute data, some don't. So, for instance, an (alpha)I64 is pure incremental, hence the "I", and you can't determine commutation immediately when it is powered on. Once it is moved to the index position, the angle code jumps to zero, and my converter can produce commutation info. If you provide battery backup to the encoder, then it will be able to give commutation immediately when the CNC control is powered on. The (alpha)A64 has additional absolute data that allows my converter to produce commutation at power on, with no battery backup. Fanuc uses at least 5 different types of connectors on their encoders. I also have a converter for the Panasonic MUMS series motors. Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
