On 02/18/2018 03:14 PM, Al Kossow via cctalk wrote: > > > On 2/18/18 9:34 AM, P Gebhardt via cctalk wrote: > >> As far as I know, some computer installations used 400Hz 3-phase >> back in the days. Does anybody know, if that is the case for this >> type of drive systems? > > Looking at the manuals, it is 3-phase 50Hz, with the phases split > between different parts of the drive. Generally, the electromechanical stuff (motors) was run from 208V 3-phase and often, the electronics from 400Hz.
At least that's what I recall. --Chuck