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
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