Recently I wrote: > We have a 220 VAC A2996A 1.3KVA UPS rackmounted with our 918. > I thought I could fool the system and use the UPS to power some > 110 VAC peripherals (like to system console). To do this, I > split the 220 voltage in a duplex receptacle by using only one > leg of the 220. If figured it like this: hot-to-hot is 220, > hot-to-neutral/ground is 110. This works okay so long as the > line power does not fail. If the line power fails and the UPS > kicks in, then something very interesting happens. The hot-to-hot > 220 circuit is okay, but now the hot-to-neutral/ground is also > 220, instead of being 110! Fortunately I put the peripherals on > a surge suppressor which kicks out when the 220 appears on the line. > > Is this "normal" behavior for this UPS? Should I just bite the > bullet and buy another UPS for use with the peripherals? Actually, > I thought there would be a 110 VAC outlet on the UPS to at least > power the system console, but there isn't. Thanks for any help > you can provide. > And Nick Demos responed with: >Not sure this is the answer, but I had a >similar problem in a house circuit where I thought I was going >to ground. It turned out that I was going to a DIFFERENT leg >of the 220 circuit. I would check your connections closely. What I really meant to say is that when the system is on line power, I can get 220 across two legs, and 110 from each leg to ground. BUT, when the UPS kicks in I lose the 110; that is, what used to 110 (the hot-to-neutral/ground) is now 220. In fact, there is no way to get 110 out of the UPS (at least as far as I can determine). I've tried each leg to ground and there is no 110. Hope this clarifies the issue. Jim Phillips Manager of Information Systems E-Mail: [log in to unmask] Therm-O-Link, Inc. Phone: (330) 527-2124 P. O. Box 285 Fax: (330) 527-2123 Garrettsville, Ohio 44231