One of the maintenance department\u2019s most significant efforts to foster sustainability at the more than 300 buildings it services is a testing program for HVAC motors controlled by variable frequency drives (VFDs). Many of the buildings have their own maintenance managers. Whenever such a manager requests testing on a motor in his\/her building, technicians from maintenance headquarters use portable oscilloscopes and voltage measuring probes to determine whether or not shaft voltages are present \u2014 voltages which cause electrical discharges through the motor\u2019s bearings.<\/p>\n
If harmful discharge levels are detected, the maintenance department may recommend the installation of a bearing-protection device that bleeds off the damaging currents. In this case, the university chose an AEGIS SGR Bearing Protection Ring. The shaft grounding ring redirects VFD-induced shaft voltages by providing a very-low-impedance path from shaft to frame, bypassing the motor bearings entirely. Conductive microfibers line the entire inner circumference of the ring in two rows, surrounding the motor shaft. A protective channel in the ring allows the fibers to flex without breaking and keeps out debris.<\/p>\n
Read the complete article at Sustainable Facility<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":" One of the maintenance department\u2019s most significant efforts to foster sustainability at the more than 300 buildings it services is a testing program for HVAC motors controlled by variable frequency drives (VFDs). Many of the buildings have their own maintenance managers. Whenever such a manager requests testing on a motor in his\/her building, technicians from … Continue reading University Improves Sustainability of HVAC Motors<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/posts\/3452"}],"collection":[{"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/comments?post=3452"}],"version-history":[{"count":1,"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/posts\/3452\/revisions"}],"predecessor-version":[{"id":3453,"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/posts\/3452\/revisions\/3453"}],"wp:attachment":[{"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/media?parent=3452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/categories?post=3452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unrbep.org\/dealerportal\/wp-json\/wp\/v2\/tags?post=3452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}