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What is an On-Off Controller?

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Electrical Engineer
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China


What is an On-Off Controller?


On-Off Controller Definition


An on-off controller is defined as a control system that fully opens or closes the control element when the process variable crosses a preset level.



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Working Principle


The on-off controller works by fully opening or closing the output value, causing the process variable to change direction and cycle continuously.


 

Example of Application


A typical example is the cooling fan control in transformers, which activates based on temperature levels.


 

Actual response curve


 


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Dead Time


Practical systems experience a delay, known as dead time, between the control signal and the action.


 

Ideal vs. Actual Response


The actual response curve of an on-off control system differs from the ideal due to the presence of dead time.



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