notes7 - Background Information on Computer Controllers...

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Background Information on Computer Controllers used in Lab 7. The PCs have been programmed in LabVIEW to execute two different types of temperature controllers. The first is an “ON-OFF” or “Bang-Bang” controller. The second is called a PID (Proportional-Integral-Derivative) controller. The first is very simple, just like the analog controller of Exercise 1, and is similar to how a typical home heating system works. It requires the least system complexity to implement. This type of controller applies full output power once a minimum setpoint has been reached and turns off power when a maximum setpoint has been reached. The margin between these two setpoints is known as hysteresis and is intentionally placed in the system to prevent excessive switching of the heater power switching hardware, which is typically a magnetic contactor. Excessive switching of systems, such as a home furnace, can cause premature equipment failure. The second controller is very common in industrial control applications and is capable of maintaining a very small error in the controlled parameter error (in this case temperature). It does this by using the difference between the desired value and the actual value, called error. The controller computes
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This document was uploaded on 02/05/2012.

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notes7 - Background Information on Computer Controllers...

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