VACUUM CONTROLLER AND METHOD OF CONTROLLING VACUUM IN A DAIRY MILKING SYSTEMS

摘要

A control system for a vacuum milking system (10), and method of controlling vacuum in such milking system (10). The system (10) comprises an electric vacuum pump motor (14), a vacuum transducer (22) for providing an output signal that varies as a function of changes in vacuum in the milking line (20) and a variable frequency drive (VFD) (16) connected to the vacuum pump motor (14) and the transducer (22) for controlling the speed of the motor (14). The VFD (16) varies the frequency of the power signal it provides to the motor (14) as a function of deviation between the output signal from the transducer (22), which the VFD (16) is programmed to recognize as representative of vacuum, and a setpoint representative of vacuum.