New HIDS Drum Scales!
Click Here to Learn More!The PID settings control how the controller reacts to a change in product or density flow. This is accomplished by using differing and opposite levels of motor speed control to maintain a set flow rate.
The “P” is the percentage of opposite motor speed control. (As an example: “P” of 50 and an “I” of 11) If there was a +20 lb error in the rate, the controller would apply a -10 lb corrective force to counter the change. (50 percent) For a slower change using less energy, reduce the P to a lower percentage. The reaction will be at a lower intensity, which will allow more drift. If your application can withstand the slightly larger rate change you can save some energy.
The “I” is how fast to make the change and is established mostly by the Waversaver and Averages settings. There is also an “I” register that builds a control history and applies this to the motor speed control. The longer you run the better the control. If you see a start rate that is always slightly low, increasing the “I”. (0.2 would help.) If the start rate was running slightly higher than the setpoint. Reducing the “I” by 0.2 would help settle that rate a little faster.
Adjusting the P and I setting for an optimum performance is easy. Performing the advanced, 2 or 5 point auto rate calibration program will establish good base PID numbers. These calculated PI numbers provide an aggressive control starting point and normally do not require any additional changes.
