[PLUG] UPS shopping

Dick Steffens dick at dicksteffens.com
Sun Dec 31 00:46:39 UTC 2023


On 12/30/23 15:29, Chuck Hast wrote:
> I am not sure you would have to check on each manufacturer, the best ones
> are on line double conversion
> the power goes through the UPS, it is rectified, the battery floats on it
> and the DC feeds an inverter so that
> the load never sees mains power. The rest of them are some form of
> standby/offline UPS which switches
> to the battery backed inverter if there is a failure or sag of some sort on
> the power line. The better ones will
> have line filtering to clean up the trash that is sometimes called utility
> power, again your mileage may vary
> Google is you friend on this one.
>
> Most of the better "pure sine wave" units do quite well, Triplite was used
> heavily on the glass container
> inspection machines I worked on, some plants had their own gen stations and
> the power was "up and down"
> line wiese (voltage and frequency) those never seemed to go offline they
> just did their job.  In the hospital
> labs we have been using Cyber Power, these UPS also appear to do the job,
> everywhere we have  put
> equipment behind them we have had no more issues with DOA PSU's and logic
> modules.  There is APC
> which is all over the place, my issue with them was mainly that was the go
> to by the BioMed folks and
> APC kept on selling them modified sine wave vice pure sine wave and we
> would continue to have issues.
> Why APC would sell them modified sine wave when we had told them that they
> needed pure sine wave
> I do not not but kind of left a bad note in my mind about APC.
> I have a lab that put in APC pure sine wave and they have had no issues
> with power since. So I think that
> as long as you do a bit of due diligence you are probably in good shape.
>

Thanks.

-- 
Regards,

Dick Steffens


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