19 Feb
2018
19 Feb
'18
6:07 a.m.
On Feb 18, 2018, at 11:02 PM, Chuck Guzis via cctalk
<cctalk at classiccmp.org> wrote:
On 02/18/2018 04:55 PM, Al Kossow via cctalk wrote:
It varies. Looking at CDC 6600 CPU cabinet power schematics, you can see 400 Hz 3 phase
powering the DC supplies, and 50/60 Hz three phase for the cooling system compressors. An
interesting detail is that the DC supplies seem to be unregulated, with choke input
filters. That makes some sense, the load is reasonably constant with the logic used in
the 6600, and choke input supplies have decent regulation.
The DD60 console takes 400 Hz 3 phase for the high voltage supply, and uses 60 Hz single
phase (120 volt) for the other supplies.
paul
On 2/18/18 4:07 PM, Chuck Guzis via cctalk wrote:
Perhaps that's only for controllers and CPUs and such. It's been too
long... 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
that isn't what the schematic looks like.
there is a low voltage transformer hung off one of the phases