CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK> wrote on 03/22/2007 04:46:35 PM:
> Hi Citizens: > > Does anyone use an uninterruptible power supply for their X-ray > generator? Here at UCDIY, the electricity supply is pretty sketchy, > and it is hammering our X-ray generator every time someone forgets to > feed the hamster or grease his wheel. If so, how much does such a > thing cost, and how unpleasant is it to maintain (since at UCDIY, you > get to do all your own maintenance)? > > Thanks in advance. > > Bill Hi Bill - I'm afraid a UPS for that kind of power load may be very expensive. My 007HF needs a 20 amp, 200 VAC circuit, so let's say the UPS needs to be able to deliver 4 kW of power (you could probably get away with less). If you're talking about an older power hog like an RU-H3R, that wants an 85 amp (!) 200 VAC circuit, so your UPS needs to handle 17 kW load. Let's assume that you're trying to ride out little glitches (seconds to minutes), not long outages. So you don't need huge battery capacity, just high wattage. Here's a couple of sites that might help you - they helped me when I was looking for a UPS: http://www.powerware.com/UPS/selector/SolutionOverview.asp http://www.apcc.com/template/size/apc/index.cfm? http://www.advizia.com/tripplite/ You'll find that a UPS to run a low-power generator like the 007HF will cost you $5000 - $10,000, while something that can handle an RU-H3R looks like it'll cost $20k and up. I'm not even sure that all of these systems will deliver 3-phase power like the generator needs. I never considered getting a UPS for my generator, even though our building has no backup power and Con Ed also forgets to feed their hamsters occasionally. What I did get was a UPS for my cryostream - I figured that the data collection can always be restarted if the generator died in the middle of the night, but once the crystal is gone, it's gone. I paid less than $10k for a UPS that can run my Cryojet for over 15 hours, so even if the power goes out in the middle of the night, I can come in and rescue the crystal the next day. Email me if you want more info on my choice of UPS for my cryo. - Matt -- Matthew Franklin , Ph.D. Senior Scientist, ImClone Systems 180 Varick Street, 6th floor New York, NY 10014 phone:(917)606-4116 fax:(212)645-2054 Confidentiality Note: This e-mail, and any attachment to it, contains privileged and confidential information intended only for the use of the individual(s) or entity named on the e-mail. If the reader of this e-mail is not the intended recipient, or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that reading it is strictly prohibited. If you have received this e-mail in error, please immediately return it to the sender and delete it from your system. Thank you.
