Variable frequency drives for pumps - VFD
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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.
Variable frequency drive
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We have more than 10 years practical experience in VFD drives producing in Shenzhen China.
VFD drives, also known as ac drives and VFDs, are widely used in HVAC systems, pumps and conveyors. An ac drive controls the rotational speed of an electric alternating current (AC) motor by adjusting both voltage and frequency of the electrical power supplied to the ac motor.
The efficient way of cutting down the electricity cost on these motors is to adjust the frequency or speed of operation for the ac motor when big power AC motor is being used. It is the general purpose of the variable frequency drives (VFD) being used for. Electric motors that do not adjust their frequency are limited to operate at the maximum frequency all the times, even when not so much power demand. The ability to adjust the frequency when less power is needed, and also can achieve full power running of the motor can improve efficiency, electricity savings, and optimize the motor-driven process. The energy savings from a frequency inverter can be dramatic, with common energy savings of fifty percent or more. Another advantage of using variable frequency drive is their ability to extend the speed range of the ac motor by being able to have adjustable frequency up to 4000 Hz rather than the normal maximum of 50/60 Hz. However, operation of motors at speeds above their rated operating speeds must be checked and approved by the motor manufacturer. Most ac drives are often programmable and allow the operator to select the conditions that are most suitable for their particular application.
