FAULT DIAGNOSTIC METHOD OF PUMP

PURPOSE: To provide a fault diagnostic method in which a fault can be diag nosed without installing a special sensor by a method wherein a fault warning is output when the motor current value of a pump which has been loaded exceeds a preset lower limit value. CONSTITUTION: In a data processor 1, a m...

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Bibliographic Details
Main Author NISHIKAWA TATSUYA
Format Patent
LanguageEnglish
Published 22.03.1996
Edition6
Subjects
BLASTING
HEATING
LIGHTING
MEASURING
MECHANICAL ENGINEERING
NON-POSITIVE DISPLACEMENT PUMPS
PHYSICS
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
WEAPONS
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Summary:PURPOSE: To provide a fault diagnostic method in which a fault can be diag nosed without installing a special sensor by a method wherein a fault warning is output when the motor current value of a pump which has been loaded exceeds a preset lower limit value. CONSTITUTION: In a data processor 1, a motor current value IO is input at a time when, e.g. pumps for which the number of operating pumps has been controlled are loaded, and data is sampled at a rate of one time/day or the like. Then, the motor current value is compared with a preset motor lower limit value IOL, and a lower limit warning is judged. When the motor current value exceeds the lower limit value IOL, a warning generation device 6 outputs a warning via a central processing unit 3, and the corresponding pumps are stopped. In addition, data on the current value IO which has been sampled by the data processor 1 is stored by a data storage device 2, the data is edited by the unit 3 so as to be output to a display 4 and a printer 5, and a trend control graph or the like is displayed or printed.
Bibliography:Application Number: JP19940212317