Detailed explanation of constant pressure water supply PID control of ABB inverter
I have worked in the paper industry for many years, and I have a certain understanding of the control of the paper industry. I am usually annoyed that my employees do not know enough about the electric control of the paper industry. Later, I compiled a training material about the commonly used controls in the paper industry and sent it to all the workers in the department to read it, This training material fully explains the working principle and process of the control of the paper industry in detail according to the actual circuit, covering the control of peripheral equipment of paper electronic control, including the direct start of the motor, frequency conversion control, soft start control, forward and reverse rotation control, multi speed motor control, two place control, paper machine drive control, rewinder, paper cutter, compound machine, Packaging and conveying system and driving control can be said to cover all the electrical controls of the paper mill. Now, I will send one section to you for communication. I hope you can correct me PID control of constant pressure water supply PID control P: Proportional link. Also called amplification link, its output and input are always in a fixed proportion. 1: Integral link: the output is equal to the integration of the input with respect to time. D: Differential link: refers to the differential that the output is equal to the input. Differential is only related to the rate of change, but not the absolute value of the rate of change. The larger the deviation, the stronger the control. Its main function is to have a stronger ability to restrain the fluctuation of changes. PID: proportional integral differential regulator. Working process: at the moment of fluctuation, the differential output is maximized due to the leading role of the differential, and the proportional control also starts to work. Then the change rate of fluctuation is zero (ideal state). Therefore, the differential output begins to decay and the curve begins to decline. At this time, due to the effect of deviation. The integral starts to work, making the curve rise,. With the gradual disappearance of differential action, the integral plays a leading role until the deviation completely disappears (ideal state). The output of integration is no longer increased. The proportion control is throughout.