How much energy savings, if any can be derived from replacing a 40 hp 1200 rpm motor with a VFD motor-this is to run a hydraulic pump-system pressure is 2000 PSI and most of the time only about 15-18 gpm makeup fluid is needed. The original system keeps the 1200 rpm constant and loads/unloads the pumps on demand(45 gallons of accumulators, fixed displacement pumps, piggyback arrangement, amp draw is about 23 amps when the 5 gpm pump is loaded and about 50 amps when both the 5 and 35 gpm pumps load). The proposed new pump would require approx. 500-600 rpm to produce the needed 15-18 gpm of makeup fluid. I'm having a little trouble seeing any savings as the load remains the same-only the pump control method and the rpm change. Thanks for any direction, advice, Maytag
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