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Chapter 12: Control Element - Coggle Diagram
Chapter 12: Control Element
Mechanical Control Elements
Hopper valve and A conveyor system
The control system is to maintain the flow of grain from the storage bin to provide a constant flow rate on the conveyor
Flow depends on the height of grain in the bin. Hence the hopper must open or close to compensate for the variation
Actuator operate a vane-type valve to control the grain flow rate
Mechanical Control System
Thickness control Roller
Paper is form of wet fiber, fiber passed between the rolles
By varying the roller separation, paper thickness is regulated
The
control element is movable roller
The actuator to adjust the separation of the roller based on the thickness measurement
Electrical Control Element
Motor Speed Control
By varying the roller separation, paper thickness is regulated direct change of operating voltage or current
For a DC motor, voltage measurements of engine speed from a tachometer are used in a process- control loop to determine the power applied to the motor brushes
Electrical control element
Temperature control
Temperature can be controlled by using electrical heaters
Heat supply by heaters electrically in endorthermic reaction, the process control signal cna be used to ON/OFF cycle a heater or set the heater within a continous span of operating voltages
