![]() Sounds dead simple eh? Understanding the controller So that’s a really, really basic overview of a simple feedback control system. In our house the disturbance may be the sun beating down on the roof, raising the temperature of the air inside. Then a disturbance hits the system and the controller has to kick in again. This process is repeated until the house has cooled down to 22☌ and there is no error. The sensor picks up the lower temperature, feeds that back to the controller, the controller sees that the “temperature error” is not as great because the PV (temperature) has dropped and the air con is turned down a little. ![]() The air-con is switched on and the temperature drops. Let’s imagine the temperature PV in our house is higher than the SP. In our house this will either be cooling or heating depending on whether the PV is higher or lower than the SP respectively. However, if there is a disparity between the SP and the PV we have an error and corrective action is needed. It doesn’t have to do anything, it will set its output to zero. If the SP and the PV are the same – then the controller is a very happy little box.
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