On Tue, 19 Jul 2016, et...@757.org wrote: > The Cray is single phase, the only thing I've ever owned that was 3 > phase was the laser stuff. Now my solid state laser projector uses 100 > watts and producsed half the power of the argon that used to take 3ph @ > 30A (and still tripped the breaker sometimes.)
I haven't been able to articulate anything witty, but I'll go ahead and just say: Ethan I don't know what you do with those BF-lasers, but it sounds damn awesome, anyway. Your stock just went up. It's hard to make lasers anything but sci-fi radical coolness. > I've heard sometimes the utility will indeed give you 3phase but you > have to pay them to replace the transformer and it's very very > expensive. Yep. It's happened in every case I've been involved with here in Colorado (ie.. residential or small buildings, not in data centers). > Normally it's people buying used milling equipment that are after it > from my experience. There are rotary converters and solid state > converters but probably not ideal for huge loads. ... and as I mentioned before, they can break. So, even if your VCF will handle the load, your uptime requirement might be a dealbreaker if you have commercial intentions. > The Cray uses 5 x Pioneer magnetics power supplies that I believe are > identical to those in the Sun E10000. "back in the day" I was a certified (not as an FE, though) in various ways for the E10k, E15k, and E25k. We had several at Oracle when I worked there. However, I don't remember that detail (the brand of the PSs). I'm sure you are right, though. > Note - in the modern datacenter in the US it's not uncommon for > everything to be run on 208, but everything would run on 120. Yep, that's my experience, too. Although many telco datacenters still use DC. They are funny like that. -Swift