11 Mar
2023
11 Mar
'23
1:42 a.m.
On Mar 10, 2023, at 6:32 PM, Chuck Guzis via cctalk
<cctalk(a)classiccmp.org> wrote:
On 3/10/23 15:11, Fred Cisin via cctalk wrote:
CDC 6000 series is the one I know of. But they'd also use either 1 or 3 phase regular
50/60 Hz power. For example, the console display uses 3 phase 400 Hz for its power
supplies (nice for low ripple) and 60 Hz 110 V for fans. The CPU cabinet takes 400 Hz
power to run its power supplies but 60 Hz power for the compressors that cool the Freon
that cools the logic.
As for 3 phase, PDP-11 CPUs did not, but some of the disk drives (like RP06) do since they
use 3 phase induction motors to drive the spindle.
paul
extension cord / dedicated circuit / dedicated
pole transformer
Which machines needed 3-phase?
Extra points for requiring an MG set furnishing 400Hz 3-phase.
--Chuck