On 11/08/2016 11:08 AM, Guy Sotomayor Jr wrote:
I’m looking to have to do something to get 3-phase for the
IBM 4331 gear. I haven’t quite added up the power
requirements yet but I’m guessing its going to be in the
10-15kVA range. Since the power to all of the gear is
really split between 3 loads (string of 4 3340 drives,
3803 control unit + 2 3420 tape drives and 2821 control
uint + 1403 printer + 2540 card reader/punch) I need to
figure out if it’s best to have one big converter or 3
smaller ones. It’s unlikely that I’d be running all of the
peripherals at once. The 4331 itself runs off of single
phase 220v. TTFN - Guy
This is tricky stuff. Motor VFDs produce 400 V square waves
of varying duty cycle, so unless you built a very good
filter, you couldn't feed that to a a lot of these devices.
Possibly you could rewire all that stuff to run the
electronics off single-phase power, and use VFDs for the
3-phase motors. I know the tape drive vacuum blowers and
1403 printer had 3-phase motors in them. Likely the 3340's
do, too. I'm guessing some of those control units may have
run off single-phase, with the supplies balanced across
different phases. That was fairly common for stuff that
didn't draw massive amounts of power. Sounds like QUITE a
project!
Jon
