Delta MS300 Series User Manual page 409

Chapter 12 Descriptions of Parameter SettingsMS300
 Pr.00-20 = 0, the digital keypad controls the set point.
 Pr.08-00 = 1 (negative PID feedback from analog input)
 ACI analog input Pr.03-01 = 5, PID feedback signal.
Pr.08-01-08-03 is set according to actual conditions.

If there is no oscillation in the system, increase Pr.08-01 (Proportional Gain (P))
If there is no oscillation in the system, decrease Pr.08-02 (Integral Time (I))
If there is no oscillation in the system, increase Pr.08-03 (Differential Time (D))
 Refer to Pr.08-00–08-21 for PID parameter settings.
08-01
Proportional Gain (P)

Settings
 1.0: Kp gain is 100%; if the setting is 0.5, Kp gain is 50%.
 Sets the proportional gain to determine the deviation response speed. The higher the
proportional gain, the faster the response speed. Eliminates the system deviation; usually used
to decrease the deviation and get faster response speed. If you set the value too high, overshoot
occurs and it may cause system oscillation and instability.
 If you set the other two gains (I and D) to zero, proportional control is the only effective
parameter.
08-02
Integral Time (I)

Settings
 Use the integral controller to eliminate the deviation during stable system operation. The integral
control does not stop working until the deviation is zero. The integral is affected by the integral
time. The smaller the integral time, the stronger the integral action. It is helpful to reduce
overshoot and oscillation for a stable system. Accordingly, the speed to lower the steady-state
deviation decreases. The integral control is often used with the other two controls for the PI
controller or PID controller.
 Sets the integral time of the I controller. When the integral time is long, there is a small I
controller gain, with slower response and slow external control. When the integral time is short,
there is a large I controller gain, with faster response and rapid external control.
 When the integral time is too short, it may cause overshoot or oscillation for the output frequency
and system.
 Set Integral Time to 0.00 to disable the I controller.
08-03
Differential Time (D)

Settings
 Use the differential controller to show the system deviation change, as well as to preview the
change in the deviation. You can use the differential controller to eliminate the deviation in order
to improve the system state. Using a suitable differential time can reduce overshoot and shorten
0.0–1000.0 (When Pr.08-23 bit 1 = 0)
0.00–100.00 (When Pr.08-23 bit 1 = 1)
0.00–100.00 sec.
0.00–1.00 sec.
400
Default: 1.00
Default: 1.00
Default: 0.00