I appreciate the input, thank you!
From: AF <af-boun...@af.afmug.com> On Behalf Of Forrest Christian (List Account) Sent: Tuesday, September 05, 2023 7:30 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] AC voltage alarm thresholds 265V is a common top voltage threshold, but you'll need to look at the equipment specs. The US grid is specified to produce 120/240V +-5%. So 240 could be up to 254V and still be in spec. (240V+12V) Equipment is supposed to accept at least +-10%, so up to 264V. (240V+24V). Personally I'd set the threshold at at least 255V. On Tue, Sep 5, 2023, 4:09 AM <dmmoff...@gmail.com <mailto:dmmoff...@gmail.com> > wrote: Do any of you smart guys know how far out of whack does AC voltage have to be to cause trouble? We have an NMS monitoring rectifier input voltage and it’s current alarm threshold is 250V. Occasionally that goes off and everyone ignores it. I’d like to set an alarm threshold where we should actually be alarmed about it. The Vertiv rectifier spec sheets claim we get full efficiency up to 300VAC, and the alarm threshold in their default config is 326V. So I’m not so concerned about those. There’s probably other stuff on fire before the rectifier gives a hoot, but the other stuff might matter. We usually have an air conditioner separate from the rectifier, and occasionally in places there’s a UPS with something on it that can’t run on DC. -Adam -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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