Pump system and method for operating the same

Details Pump system and method for operating the same Pump system and method for operating the same

1994-03-23

1997-09-16

Thorpe, Timothy

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

417 441, F04B 4900

Patent

active

056673620

ABSTRACT:
A pump system comprising a pump having a centrifugal impeller driven by an electric motor, a pair of upper and lower float switches for detecting a high water level HWL and a low water level LWL, respectively, a controller for outputting a control signal on the basis of preset rotational speeds for low and high-speed operations and a preset rotational speed increment rate, together with output signals from the upper and lower float switches, and a frequency converter for varying the rotational speed of the electric motor on the basis of the control signal from the controller, the pump system is capable of exhibiting the required pumping performance and of controlling the flow rate and the pump head.

REFERENCES:
patent: 3095818 (1963-07-01), Nobles et al.
patent: 4171186 (1979-10-01), Chapman
patent: 4370098 (1983-01-01), McClain et al.
patent: 4560323 (1985-12-01), Orchard
World Pumps, Mar. 1993, 318:9-11, Grundfos pumps with new technology.

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