Chapter 12 Descriptions of Parameter SettingsC2000 Plus
12.1-08-7
08-06
PID Feedback Value by Communication Protocol
Default: Read only
Settings -200.00–200.00%
Use communications to set the PID feedback value when the PID feedback input is set to
communications (Pr.08-00 = 7 or 8).
08-07
PID Delay Time
Default: 0.0
Settings 0.0–35.0 sec.
08-20
PID Mode Selection
Default: 0
Settings 0: Serial connection
1: Parallel connection
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 speed.
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 oscillation.
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 oscillate. In this case, use the PD control to
reduce the P action’s oscillation 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 oscillation; 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.
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