<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Rich, this is a known flaw in the Magnum AE and PAE series. I have one longtime client for whom I supplied a 4448AE around 2009 who later told me that had he known of this frequency issue he wouldn\u2019t have selected Magnum. </div><div dir="ltr">Allan Sindelar </div><div dir="ltr"><br>On Apr 1, 2019, at 6:56 AM, Christopher Warfel <<a href="mailto:cwarfel@entech-engineering.com">cwarfel@entech-engineering.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr">
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<p>I would think it has to be frequency. What else could shift the
time? Up until about 2 years ago we were a grid isolated system
and no one could use a plug in the wall clock. It takes just a
very little off 60 Hz for a clock to keep incorrect time. Being
off .5 Hz will result in 42,300 cycles in one day. When I worked
in power plants the frequency was a digital display to the 6th
place I think. The operator said if that decimal place was off by
more than 2 from ISONE, it would trip off line. The steam turbines
would be destroyed otherwise. Chris<br>
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<div class="moz-cite-prefix">On 4/1/2019 7:08 AM, Rich Nicol wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hello
Wrenches<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
have a site with two PAE 48v Magnum inverters stacked.
System voltage fluctuates ~ +/- 4 volts ranging from 243 to
247. Evenly split on the two lines.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Site
has a few electrical peculiarities I haven\u2019t seen on the
many other sites I have with Magnum inverters. Among those
is three digital clocks on appliances that lose ~ 5 min per
day consistently. A forth clock which is on a weather
station with a transformer where it plugs into a receptacle
keeps time and of course the computers do as they are web
connected. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
checked all neutral connections and verified proper N-G
bond.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">All
connections appropriately torqued.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">My
recollection is the modest voltage swings are within Magnum
spec. But its constantly moving about which seems somewhat
suspect to me.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Any
suggestions?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">RIch<o:p></o:p></span></p>
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