| 摘要 |
PURPOSE:To contrive to stabilize discharged scum cost, by providing a control apparatus equipped with a means for detecting the torque of an output shaft, a means for storing reference torque and a means for issuing a speed decreasing or increasing signal corresponding to the difference of actually measured torque and the reference torque. CONSTITUTION:Solid components in raw water introduced into a flotation tank 20 are floated to a water surface by generated air bubbles and scraped off by a skimmer 34 and discharged to a scum tank 39 through a scum box 36 and a pipe 38 to be sent to a dehydrator. A control apparatus main body 56 is constituted of an I/O port, which receives the signal from an A/D converter for converting the otput value of a torque meter 54 to a digital signal and transmits a control signal to a regulator 52, ROM in which a control program is stored, RAM for temporarily storing various input data and a D/A converter for performing operation processing on the basis of the program and various data.
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