You know, it's ironic this topic has come up, as
I'm currently working
on
converting my 3ph SGI Onyx to single phase and had looked into static
and
rotary phase convertors. Having never had any reason to look at one
before
I started anew - and decided quickly that they did not appear to be
safe
for computer use.
Disclaimer- I have no 3-phase equipment, nor any 240V-required
computers so take this with the contempt it deserves.
For the PSUs (for given machine X that does not have 3-phase motors for
blowers or drives, or another thing that requires the rotating field of
3-phase), aren't they composed of (roughly) 3 standalone PSUs that
convert the incoming power to a DC-source feeding the rails? Therefore,
(and especially if it is wired phase -> neutral rather than
cross-phase), provided the voltage supplied by a single-circuit would
be within the range of acceptable input voltages for the PSU, couldn't
they be driven by 1 split 240V circuit (driving 2 at 120V
hot-to-neutral) and a third 120V line feeding the third PSU?