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Entry  Fri Aug 7 16:14:57 2009, rob, Omnistructure, VAC, UPS failed 
    Reply  Fri Aug 7 19:34:40 2009, steve, Summary, VAC, UPS failed 
    Reply  Sat Aug 15 18:57:48 2009, rana, Update, VAC, UPS failed 
       Reply  Mon Aug 24 16:48:57 2009, steve, HowTo, VAC, new UPS installed 
Message ID: 1912     Entry time: Sat Aug 15 18:57:48 2009     In reply to: 1858     Reply to this: 1937
Author: rana 
Type: Update 
Category: VAC 
Subject: UPS failed 

As Rob noted last Friday, the UPS which powers the Vacuum rack failed. When we were trying to move the plugs around to debug it, it made a sizzling sound and a pop. Bad smells came out of it.

Ben came over this week and measured the quiescent power consumption. The low power draw level was 11.9 A and during the reboot its 12.2 A. He measured this by ??? (Rob inserts method here).

So what we want is a 120 V * 12.2 A  ~ 1.4 kVA UPS with ~30-50% margin. We look for this on the APC-UPS site:

On Monday, we will order the SUA2200 from APC. It should last for ~25 minutes during an outage. Its $1300. The next step down is $200 cheaper and gives 10 minutes less uptime.

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