On 8/10/06, Mike Medai <[EMAIL PROTECTED]> wrote:
Tripp Lite also makes these: http://www.tripplite.com/products/conditioners/index.cfm
We actually have some units very like that in use now. They're APC, but same idea. What these particular devices do is provide a multi-tap transformer which automatically switches taps based on the input voltage. For example, if the input drops below 110 VAC, switch in a 8% step-up; if it drops below 105 VAC, switch in a 12% step-up. You can actually hear the relays clicking as they switch taps. They throw in some basic TVSS and noise filtering circuits, too. I suspect this type of device is perfect for situations where line voltage is consistently out of tolerance by a certain amount. However, they do not provide isolation from line transients or noise, nor can they cope with severe undervoltages (< 95 VAC or so). We have both here. Sometimes, when everything else is running and then the big mill kicks in, the lights go out for a fraction of a second. The nature of these voltage regulators also means the regulation is somewhat approximate -- there are typically only three or four taps, and it takes time to switch taps. I'm not sure how much that really matters, but given that some of this test equipment costs > $100,000, I'm willing to pay to get "perfect" conditioning. :-) The Tripp Lite "Smart Online" series (see posts by Jared Watkins and Jim Kuzdrall) does look like it might fit the bill. -- Ben _______________________________________________ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss