INTELLIGENT PUMP SYSTEM
First Claim
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1. A method of controlling operation of a centrifugal pump in a fluid pumping system having a variable frequency drive (VFD) powering an alternating current (AC) motor which turns said centrifugal pump, said method comprising:
- internally monitoring automatically output current and voltage of the VFD to the AC motor without the need for an external sensor;
calculating automatically output power based on monitored values of said output current and voltage;
checking automatically whether said calculated output power is either above a predetermined high power limit or below a predetermined low power limit for a desired setpoint; and
initiating automatically a predetermined response action if said calculated output power is either above said predetermined high power limit or below said predetermined low power limit.
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Abstract
The present invention is a controller specifically for pumps, making the benefits of variable frequency drive (VFD) technology more accessible to pump users. The present invention incorporates pump-specific system optimization software, an industrial grade drive, and a menu-driven user interface, offering protection, reliability, and ease of use not possible with other variable frequency drives.
235 Citations
40 Claims
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1. A method of controlling operation of a centrifugal pump in a fluid pumping system having a variable frequency drive (VFD) powering an alternating current (AC) motor which turns said centrifugal pump, said method comprising:
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internally monitoring automatically output current and voltage of the VFD to the AC motor without the need for an external sensor; calculating automatically output power based on monitored values of said output current and voltage; checking automatically whether said calculated output power is either above a predetermined high power limit or below a predetermined low power limit for a desired setpoint; and initiating automatically a predetermined response action if said calculated output power is either above said predetermined high power limit or below said predetermined low power limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification