Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-09-21
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Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-09-21: Discussion question: 242. Please briefly describe the components of a cascade control system
A cascade control system uses two sets of sensing transmitters and two regulators; the output of the first regulator serves as the setpoint for the second regulator, while the output of the second regulator is sent to the control valve. A cascade control system is a system in which two regulators operate in series, with the output of one regulator serving as the setpoint for the other regulator.
A cascade control system uses two sets of sensing transmitters and two regulators; the output of the first regulator serves as the setpoint for the second regulator, while the output of the second regulator is sent to the control valve. A cascade control system is a system in which two regulators operate in series, with the output of one regulator serving as the setpoint for the other regulator.
A cascade control system is a system in which two regulators operate in series, with the output of one regulator serving as the setpoint for the other regulator. This system is primarily applied in situations where the lag and time constant of the object are large, interference is strong and frequent, load variations are significant, and high control quality is required. The main characteristics of a cascade control system are: (1) In terms of its structural layout, it is a double-loop control system composed of two controllers that operate in series ； (2) The purpose of the system is to improve the control quality of the primary variable by introducing secondary variables ； (3) Due to the presence of the secondary loop, there is a leading control effect on the disturbances that enter this loop, thereby reducing the impact of those disturbances on the primary variable ； (4) The system has a certain degree of adaptability to changes in load.
A cascade control system uses two sets of sensing transmitters and two controllers; the output of the first controller serves as the setpoint for the second controller, while the output of the second controller is sent to the control valve. The previous regulator is called the main regulator, and the variable it detects and controls is referred to as the main variable (the primary controlled parameter), that is, the process control indicator ； The latter regulator is called a secondary regulator, and the variable it detects and controls is known as a secondary variable (secondary controlled parameter); it is an auxiliary variable introduced to stabilize the primary variable. The entire system consists of two control loops, the main loop and the auxiliary loop. The secondary circuit consists of a secondary variable detection transmitter, a secondary regulator, a control valve, and the secondary process ； The main loop consists of a main variable detection transmitter, a main regulator, a secondary regulator, a control valve, a secondary process, and a main process.
A cascade control system uses two sets of sensing transmitters and two regulators; the output of the first regulator serves as the setpoint for the second regulator, while the output of the second regulator is sent to the control valve. A cascade control system is a system in which two regulators operate in series, with the output of one regulator serving as the setpoint for the other regulator.
A cascade control system uses two sets of sensing transmitters and two controllers; the output of the first controller serves as the setpoint for the second controller, while the output of the second controller is sent to the control valve. The previous regulator is called the main regulator, and the variable it detects and controls is referred to as the main variable (the primary controlled parameter), that is, the process control indicator ； The latter regulator is called a secondary regulator, and the variable it detects and controls is known as a secondary variable (secondary controlled parameter); it is an auxiliary variable introduced to stabilize the primary variable. The entire system consists of two control loops, the main loop and the auxiliary loop. The secondary circuit consists of a secondary variable detection transmitter, a secondary regulator, a control valve, and the secondary process ； The main loop consists of a main variable detection transmitter, a main regulator, a secondary regulator, a control valve, a secondary process, and a main process.
The cascade control system uses two sets of sensing transmitters and two controllers, with the output of the main controller serving as the setpoint for the secondary controller
A cascade control system consists of 7 components: the main controlled object, the secondary controlled object, the main measurement transmitter, the secondary measurement transmitter, the main controller, the secondary controller, and the actuator (control valve).
A cascade control system uses two sets of sensing transmitters and two regulators; the output of the first regulator serves as the setpoint for the second regulator, while the output of the second regulator is sent to the control valve. A cascade control system is a system in which two regulators operate in series, with the output of one regulator serving as the setpoint for the other regulator.