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cascade control

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cascade control [ka′skād kən‚trōl]
(control systems)
An automatic control system in which various control units are linked in sequence, each control unit regulating the operation of the next control unit in line.


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As shown in the Figure 2, the cascade control system forms two closed loops in terms of the structure, the flow loop and the pH loop, which are called auxiliary ring and main ring respectively.
The pumps are then controlled in response to a pressure transducer and cascade control ensures adequate vacuum and flow rate is available for all connected machines at all times.
Hardware for the system consists of two Steelastic Sentry Pro 1000 control systems that each have 32 analog and digital inputs, 24 frequency/count/duty cycle channels, full PID control on all analog or frequency inputs, 16 user-definable cascade control loops, and up to six digital drive interfaces.
 
 
 
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