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Re: [TowerTalk] OT: Generators and UPS's

To:,"'towertalk reflector'" <>
Subject: Re: [TowerTalk] OT: Generators and UPS's
From: Jim Lux <>
Date: Fri, 25 Aug 2006 16:17:20 -0700
List-post: <>
At 01:59 PM 8/25/2006, John Wagner wrote:
>  A Ferroresonant type of line isolator will in-fact take a rather poor sine
>wave and make it proper.
>Topaz, Sola, Delta Emerson used to make them. They are not very efficient
>and don't like loads as they become more inductive and less resistive. SO
>they are not for every application. If they are loaded above 60%, they will
>keep up the sine wave for better than two cycles before they
>decay..sometimes, that's all you need for a 16ms UPS transfer switch to
>We have really large diesel powered gen sets here and lots of individual
>UPS's around without the problems noted when on gen power.

I suspect the problem is not the UPS, but the non-UPS loads that happen to 
be on the genset.. Flourescent lights, big switching power supplies, 
induction furnaces, arc welders, diathermy machines, tesla coils, 
etc.  Anything that's a "nonlinear" load.

>Keep the list informed if you get any answers from the UPS folks..
>John W8JJW


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