Festo CMSX-C-U-F1 Series Manual page 40

CMSX-...-C-U-F1-...
Control parameters (PID--P, PID--D)
These parameters influence the control behaviour of the device. This permits adapting the positioning
speed and the control behaviour to the respective requirements.
The I-part of the PID controller cannot be changed by the user. It is preset at the factory to a value ap­
propriate for the function.
But incorrectly set parameters can result in overswings or permanent oscillations around the setpoint
position. Small drives react to this more sensitively than large drives.
PID--P
The parameter PID--P influences the P-part of the PID-controller.
– Increasing the value increases the setpoint specification change in the case of a deviation. A
P-share that is too high results in overswings.
– Reduction in the value causes a reduction in the setpoint specification change in the case of a devi­
ation. A P-share that is too small results in slower regulation.
PID--D
The parameter PID--D influences the D-part of the PID-controller.
– Increasing the value changes the setpoint specification change less strongly with the same change
in speed of the deviation. Regulation becomes more sluggish.
– Reducing the value changes the setpoint specification change more strongly with the same change
in speed of the deviation. Regulation becomes more dynamic.
40 Festo – CMSX-...-C-U-F1-... – 1506a English