Method for controlling press filter motors with a frequency conv

Details Method for controlling press filter motors with a frequency conv Method for controlling press filter motors with a frequency conv

1991-07-01

1992-12-01

Theisen, Mary L.

Liquid purification or separation

Processes

Separating

100 37, 100 45, 100 48, 210138, 210141, 210224, B30B 1526

Patent

active

051678365

ABSTRACT:
The invention concerns a method for controlling a press filter, said press filter having electric motors for operating said press filter. At least one of said electric motors of said press filter is driven by a frequency filter. A logic control unit is used for sending a program-controlled analog signal to said frequency converter. The output current from said frequency converter having a frequency proportional to the magnitude of said analog signal received from said logic control unit is used for driving the press filter's electric motors, whose rotational speeds thereby become proportional to the drive current frequency. A desired electric motor is individually started by way of applying power to the motor via a switch element which is activated by a signal from the logic control unit.

REFERENCES:
patent: 4627914 (1986-12-01), Antonenko
patent: 4659483 (1987-04-01), Gries
patent: 4816723 (1989-03-01), Shields et al.

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