Delta ME300 Series - Page 317

Chapter 12 Description of Parameter Settings
ME300
12.1-08-2
 Differential control (D):
The controller output is proportional to the differential of the controller input. During elimination of
the error, oscillation or instability may occur. Use the differential control to suppress these effects
by acting before the error. That is, when the error is near 0, the differential control should be 0.
Use proportional gain (P) and differential control (D) to improve the system state during PID
adjustment.
4. Using PID control in a constant pressure pump feedback application:
Set the application’s constant pressure value (bar) to be the set point of PID control. The pressure
sensor sends the actual value as the PID feedback value. After comparing the PID set point and
PID feedback, an error displays. The PID controller calculates the output by using proportional
gain (P), integral time (I) and differential time (D) to control the pump. It controls the drive to use
a different pump speed and achieves constant pressure control by using a 4
–20 mA signal
corresponding to 0–10 bar as feedback to the drive. A–b

Pr.00-04 = 10 (display PID feedback (b) (%))

Pr.01-12 Acceleration Time is set according to actual conditions.

Pr.01-13 Deceleration Time is set according to actual conditions.

Pr.00-21 = 0 to operate through the digital keypad

Pr.00-20 = 0, the digital keypad controls the set point.

Pr.08-00 = 1 (negative PID feedback from analog input)

AVI analog input Pr.03-00 = 5, PID feedback signal.

Pr.08-01–08-03 is set according to actual conditions.
If there is no vibration in the system, increase Pr.08-01 (Proportional Gain (P))
If there is no vibration in the system, decrease Pr.08-02 (Integral Time (I))
If there is no vibration in the system, increase Pr.08-03 (Differential Time (D))

Refer to Pr.08-00–08-21 for PID parameter settings.