Chapter 12 Description of Parameter SettingsC2000
PID Feedback Value by Communication Protocol
Settings
Use communication to set the PID feedback value when the PID feedback input is set to
communication (Pr.08-00 = 7 or 8).
PID Delay Time
Settings
PID Mode Selection
Settings
0: Serial connection, use conventional PID control structure.
1: Parallel connection, the proportional gain, integral gain and differential gain are independent.
You can customize the P, I and D value to fit your application.
Pr. 08-07 determines the primary low pass filter time when in PID control. Setting a large time
constant may slow down the drive's response rate.
PID control output frequency is filtered with a primary low pass function. This function can filter a
mix frequencies. A long primary low pass time means the filter degree is high and a short
primary low pass time means the filter degree is low.
Inappropriate delay time setting may cause system error.
PI Control:
Controlled only by the P action, so the deviation cannot be entirely eliminated. In general, to
eliminate residual deviations, the P + I controls. When you use the PI control, it eliminates the
deviation caused by the targeted value changes and the constant external interferences.
However, if the I action is too powerful, it delays the responde when there is rapid variation. You
can use the P action by itself to control the loading system with the integral components.
PD Control:
When deviation occurs, the system immediately generates an operation load that is greater than
the load generated only by the D action to restrain deviation increment. If the deviation is small,
the effectiveness of the P action decreases as well. The control objects include applications with
integral component loads, which are controlled by the P action only. Sometimes, if the integral
component is functioning, the whole system may vibrate. In this case, use the PD control to
reduce the P action's vibration and stabilize the system. In other words, this control is useful with
no brake function's loading over the processes.
PID Control:
Use the I action to eliminate the deviation and the D action to reduce vibration; then combine
this with the P action for the PID control. Use the PID method for a control process with no
deviations, high accuracies and a stable system.
-200.00%–200.00%
0.0–35.0 sec.
0: Serial connection
1: Parallel connection
12.1-08-6
Default: Read only
Default: 0.0
Default: 0