17 Oct
2007
17 Oct
'07
10:17 a.m.
Jochen Kunz wrote:
Ahh, I think we're talking about different things. To me, a motor-generator is
a diesel (or other non-electric power source) driving a generator to produce
electricity; I've always known something which just converts electric between
forms as a rotary converter. (but I'm not sure quite what I'd call a
flywheel-storage device)
Maybe the terms are ambiguous... or I'm just plain wrong ;-) (I've had a few
experiences with generating plant, but not in a computer context...)
On Tue, 16 Oct 2007 21:49:44 +0100
Jules Richardson <julesrichardsonuk at yahoo.co.uk> wrote:
Rats, seems to be broken at the moment (I get a connection, but no data ever
comes back) :-(
That's the sort of thing worthy of video. Big
power control stuff is
fun :)
You can visit it: http://www.cray-cyber.org/ Was that
rating for the entire system, or just the CPU & I/O (no
drives etc.)?
It was just the MG starting. The machine was switched off. Current
droped to a few A once the MG got to speed. The MG has a big flywheel.
Therefore it needs all that energy to get up to speed. The idea is that
the flywheel stores enough energy to compensate short power outages. If
power stays off longer the disel kicks in. (But at Cray-Cyber they
skiped the disel. ENOSPACE.) AFAIK a minimal configuration of the
machine (CPU + I/O) needs about 20 kW.