METHOD OF OPERATING A SAFETY VACUUM RELEASE SYSTEM

A method of operating a safety vacuum release system with a controller for a pump including a variable speed motor comprises measuring an actual power consumption of the motor necessary to pump water and overcome losses. The method further comprises filtering the actual power consumption with a fast...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	BERTHELSEN, Lars, Hoffmann, STILES, Robert, W
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING BUILDING BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES FENCING FIXED CONSTRUCTIONS HEATING LIGHTING MASTS MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT PUMPS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS SWIMMING OR SPLASH BATHS OR POOLS TENTS OR CANOPIES, IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A method of operating a safety vacuum release system with a controller for a pump including a variable speed motor comprises measuring an actual power consumption of the motor necessary to pump water and overcome losses. The method further comprises filtering the actual power consumption with a fast low-pass filter to obtain a current power consumption. The method also comprises incrementing an absolute counter value if at least one of the actual power consumption and the current power consumption is less than a threshold power curve. The method additionally comprises identifying a dead head condition if the absolute counter value exceeds an absolute counter threshold value. The method also comprises triggering the safety vacuum release system when the dead head condition is identified in order to shut down the pump substantially immediately.