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Variable frequency drives for pumps

VFD

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Description

The PumpSmart system is really a standard variable frequency drive with some intelligence added to it. It automatically responds to process and pump system changes, slows down to protect the pump and understands when to resume safe operation. & quot;What we& acute;re really doing here is implementing variable frequency drives as a primary control element,& quot; added Pemberton.

A typical 75-horsepower pump uses approximately $20,000 in electricity annually, noted Pemberton. Case studies have shown operating savings between 35 percent and 45 percent with PumpSmart.

Capacitive coupling and cable charging are effects which consume some of the VFD output currents in capacitive interaction with either the other motor leads, or other adjacent cable systems. These phenomena can consume VFD power and result in reduced motor torque, VFD overload trips, and induced voltages on adjacent cable systems. The keys to reducing the cable losses associated with capacitive coupling and cable charging are: Having the lowest practical cable capacitance, and ensuring that motor lead sets are effectively shielded from each other to prevent capacitive interaction. Capacitive charging losses are proportional to the length or run, and the number of conductors with which a given set of motor leads can capacitively interact. A worst case scenario is when multiple motor leads with high capacitance (THHN for example) are ganged together in conduit.

Of course, variable frequency drives are not for everyone, cautioned Pemberton. A pump assessment can uncover process modifications that offer the most potential for efficiency improvements. More about VFD on Pumps.

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