<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You should be able to request (require) your power supply company to monitor the power at the outside of your facility and if need be inside your facility. I ran into this years ago….during summer, on hot days the voltage dropped nearly 12% from rated voltage. As a result our CNC’s drew more current which then caused the circuit breakers to trip. The first discussion with power utility was they stated it was “likely lightning strikes” nearby. They suggested we spend about $30K for a lightning suppression system. I insisted they put a recorder on the incoming electrical line. When they recorded the low voltage levels which put them well under the “legal” voltage drop they promptly upgraded the line to the building. Problem solved…no cost to me.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>John Boyle <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> labnetwork [mailto:labnetwork-bounces@mtl.mit.edu] <b>On Behalf Of </b>Johnson, Michael W<br><b>Sent:</b> Monday, June 17, 2024 10:29 AM<br><b>To:</b> Fab Network<br><b>Subject:</b> [labnetwork] Power monitoring<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Hello folks,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>We have a problem with a large compressor in a building that keeps shutting down at almost the same time on weekends. I feel like the problem may be some regular anomaly with the three phase power feeding it.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Can somebody recommend a simple product or method to record the power characteristics so we can go back and review the recorded data to see what, if anything, is going on? We have NMR's and other instruments that record when the compressed air is lost. It would be very helpful to then review recorded sine wave or other useful information to determine if we have a power problem or if the issue is actually something else. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>It really feels like a regular voltage loss that only happens on Saturday afternoons when not much is going on in the building. This is causing a lot of problems.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Appreciate any help with this.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>-Michael.<o:p></o:p></p></div></div></body></html>