Motors & Motor Controls http://ecmweb.com/taxonomy/term/19881/more en VFD driven motor shuts down an turns back on automatically http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/vfd-driven-motor-shuts-down-turns- <div class="node-body forum-body"><p>I have an Avitar 71 VFD on a 100 hp conveyer that intermittently shuts down and turns itself back on. it has happened four times thus far, and every time it happens it is at the same time of day. There has never been a fault and the &quot;trips&quot; are not on consecutive days. It&#39;s ramndom, with the exception that it happens at the exact same time of day.</p> </div><div class="og_rss_groups"></div> http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/vfd-driven-motor-shuts-down-turns-#comments Motors & Motor Controls Mon, 21 Jul 2014 14:45:59 +0000 49331 at http://ecmweb.com Motor Overload Protection http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/motor-overload-protection <div class="node-body forum-body"><p>I have a question about the setting of an overload. We have several applications where the motor may have a SF of 1.37 or 1.4 (water pumping). The motor operates around 125% of FLA and will trip the overload after sometime of running since it is a continuous applicaiton. Is there anything in the Code that gives us some leeway to adjust this setting up just a little bit to account for the larger SF or is only 125% allowed?<br /> <span>Thanks in advance for any advice you can offer.</span><br /> <span>Brad</span></p> </div><div class="og_rss_groups"></div> http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/motor-overload-protection#comments Motors & Motor Controls Thu, 17 Jul 2014 18:31:55 +0000 49201 at http://ecmweb.com VFD short circuit/ground fault http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/vfd-short-circuitground-fault <div class="node-body forum-body"><p>We have an ABB DC drive. When we start it and it runs with little to no load on it (100 amps) there&#39;s no problem. However, when we get up over that 100A, the drive goes to ground fault or short circuit. Was wondering what everyone&#39;s input would be on what could possibly be wrong. Any help is appreciated.</p> </div><div class="og_rss_groups"></div> http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/vfd-short-circuitground-fault#comments Motors & Motor Controls Sat, 28 Jun 2014 01:59:11 +0000 48411 at http://ecmweb.com VFD controls http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/vfd-controls <div class="node-body forum-body"><p>We have a problem in my plant with VFDs using an ice cube type relay for the start circuit. These relays are 120vac coils with a PLC output energizing them. Quite ofter when the output is off the relay will remain energized. I am assuming that the leakage voltage from the transistor output of the PLC is just enough to hold the relay. If the relay is pulled and put back it will not energize until the PLC output is high again. I am hoping that adding a bleeder resistor accross the relay coil will cure the problem.</p> </div><div class="og_rss_groups"></div><p><a href="http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/vfd-controls" target="_blank">read more</a></p> http://ecmweb.com/forums/general/electrical-equipment-systems/motors-motor-controls/vfd-controls#comments Motors & Motor Controls Tue, 29 Apr 2014 22:01:54 +0000 45471 at http://ecmweb.com Motor feed wire heating http://ecmweb.com/forums/general/electrical-industry-equipment-systems/motors-motor-controls/motor-feed-wire-heating <div class="node-body forum-body"><p>What are the requirements for connecting a motor feed wire (250 MCM THHN) to the 2/0 class F motor leads? Is a section of 250 MCM 180<sup>0</sup>C wire required between the 250 MCM THHN feeder wire and the 2/0 motor leads? We are seeing signs of heating on the THHN insulation near the connection. The 2/0 motor leads extend out from the motor about 6 inches. &nbsp;The motor is rated 460V, 3ph, 250 hp with 6 leads.</p> </div><div class="og_rss_groups"></div> http://ecmweb.com/forums/general/electrical-industry-equipment-systems/motors-motor-controls/motor-feed-wire-heating#comments Motors & Motor Controls Tue, 01 Apr 2014 19:54:35 +0000 43941 at http://ecmweb.com Motor-Driven System Improvement Projects http://ecmweb.com/forums/electrical-industry-equipment-systems/motors-motor-controls/motor-driven-system-improvement-p <div class="node-body forum-body"><p>The Motor Decisions Matter campaign is no longer just focused on motors. In mid 2013, the program expanded to include motor-driven systems. Do you have any success stories you can share with us, which delivered substantial energy cost savings?</p> </div><div class="og_rss_groups"></div> http://ecmweb.com/forums/electrical-industry-equipment-systems/motors-motor-controls/motor-driven-system-improvement-p#comments Motors & Motor Controls Fri, 14 Feb 2014 02:08:16 +0000 41361 at http://ecmweb.com