Question

3 Control Systems commonly use PID controllers. With the aid of sketches or diagrams, explain the conceptual basis of the operation of a PID controller. (3 marks) 4. A 1000 litre containment tank catches the outflow from a processing apparatus which has 800 litres of water with 2 g of chemical agent dissolved in it. Additional supply comes into the tank at 3 litres/hr containing 5 g/litre of the chemical agent. The solution leaves the containment tank at 3 litres/hr. When the amount of chemical agent in the containment tank reaches 500 g, no more supply is allowed to enter the system. Instead, fresh water input into the tank at 2 litres/hr; and at the same time, the outflow is increased to 4 litres/hr. How much chemical agent is held in the containment tank at any time t. Assume all liquids are well-mixed. (10 marks) australia) D. Fou 994

Answer 1

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3 PID Controllers in As The name suggest PID controllers consist of proportional integral and decivative actions herce the name ( Proportional - Integral- Derivative) controller. In order to get optimal response for specific application these Three basic coefficients are naukel Controller output Set Paint (SP) Error | PID Controller Proces Vaulatile CPU) Procey Measured pocey Vanable Sensor feedback vantable proces has In above figure proces to be maintained at a dested level. a sensor measure Assume that desired proces variable is Tenisecature le In order to The procey variable pos used. A set point is the deshed response of proces. Suppose temperature has to be maintained at 100' and Then set point is CScanned with CamScanner

h sensor 60 ec Assume that measured temperature from but temperature temperature set point is 100 °C Difference of actual value value from desined value controller algontum to produce actuator (heater) depending upon Combination Coefficients responses . PID Causes output to Lo PID continuousl vanes output to actuator till derived value is obtained CScanned with CamScanner