Birchy Posted July 24, 2008 Report Share Posted July 24, 2008 OK, now that this drive is performing adequately, I'm going back to trweaking the controls system to minimize energy costs. How can I get a feel for the cost difference of running this fan between 0% and 10%, and between 50% and 60%. That is, I need to know how much power is used off schedule when it is running at it's current minimum setting (10%), and what it costs me to increase the duct pressure with a 10% change in frequency (from say 50% to 60%, eg). single 50 HP SAF is controlled by: Altivar 58 VFD Drive settings: 460V, 60Hz, 61A, 1760 RPM mtr cos phi/power factor = .95 single 20 HP RAF is controlled by an ABB VFD Drive settings: 460V, 60Hz, ??A, 1725 RPM power factor = ?? What I'm really asking is: "Do VFD driven motors consume power linearally with the frequency?" and is there a formula to get reasonable kW/hr number from the data above? TIA Link to comment Share on other sites More sharing options...
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