Vacuum level control system using variable frequency drive

Details Vacuum level control system using variable frequency drive Vacuum level control system using variable frequency drive

1997-04-17

1999-03-09

Price, Thomas

Animal husbandry

Milkers

With automatic control

119 1402, A01J 5011

Patent

active

058786910

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.

REFERENCES:
patent: 4295490 (1981-10-01), Boudreau
patent: 4616215 (1986-10-01), Maddalena
patent: 4664601 (1987-05-01), Uchida et al.
patent: 5141403 (1992-08-01), Guo et al.
patent: 5284180 (1994-02-01), Guo et al.
patent: 5568788 (1996-10-01), Van Den Berg et al.

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