Vacuum level control system using variable frequency drive
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United States of America Patent
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Oct 5, 1999
Grant Date -
N/A
app pub date -
Apr 17, 1997
filing date -
Apr 17, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vacuum control for milking systems includes a vacuum pump driven by an electric motor which is activated by a variable frequency drive (VFD). The VFD is controlled during a milking phase by plc programmable controller and a proportional/integral (PI) controller which respond to a vacuum feedback sensor connected to the milking system. The plc controller differentiates between milk and wash phases and also provides a fixed preset speed control for a washing phase for the milking system. The integrator interfaces between a milk/wash controller and the plc.
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