8 Nov
2016
8 Nov
'16
9:08 a.m.
On Nov 8, 2016, at 8:47 AM, Jon Elson <elson at
pico-systems.com> wrote:
On 11/07/2016 10:31 PM, Jon Elson 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
On 11/07/2016 07:59 PM, Mark Linimon wrote:
And, of course, that is really SINGLE-PHASE power on 2 wires, just to save
anybody the trouble of correcting my error.
On Mon, Nov 07, 2016 at 11:23:58AM -0800, Chuck
Guzis wrote:
I have two 3-phase machines in my shop (Bridgeport mill and Sheldon lathe) and
run them each off a properly-sized VFD. 2-phase in, 3-phase out, plus variable speed and
dynamic braking.
Jon
But if you're a suburban resident living on
Mulberry Street, anything
but single-phase is pretty much out of the question.
Oh, you can get it -- but be
prepared for a large hassle.
A former neighbor had a 440V 3-phase Italian lathe in his backyard shop,
among other toys. After he was laid off from his aerospace job doing
machining it was how he made his living. He was a very handy person
to know :-)
mcl