leen Posted March 3, 2020 Report Share Posted March 3, 2020 Hi, In a control loop I am using a proportional valve with an input -10V to +10V. With that input the process can be move left and right. When it has to be go to the right the input has to be positive, depend on the distance between 0 and +10V. When it has to be go to the left, the input has to be negative between 0 and -10VDC. Therefor I am using a output -10VDC to +10VDC. Now I will use a PID loop for it. Only what I find is a positive or negative PID control, so it can just 1 side on. You can switch this between cool and heat. But I wil not use that switch cool/heat, but just depend on the process value send the control value to negative or positive. Can somebody help me to explain how to handle with this. Thanks al for any help Quote Link to comment Share on other sites More sharing options...
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