Pid Mode Selection - Delta C2000 series User Manual

PID Mode Selection

Settings
 When setting is 0, it uses conventional PID control structure.
 When setting is 1, proportional gain, integral gain and derivative gain are independent. The P, I
and D can be customized to fit users' demand.
 Pr.08-07 determines the primary low pass filter time when in PID control. Setting a large time
constant may slow down the response rate of drive.
 Output frequency of PID control will filter by primary low pass function. This function could filtering
a mix frequencies. A long primary low pass time means filter degree is high and vice versa.
 Inappropriate setting of delay time may cause system error.
 PI Control: controlled by the P action only, and thus, the deviation cannot be eliminated entirely. To
eliminate residual deviations, the P + I control will generally be utilized. And when the PI control is
utilized, it could eliminate the deviation incurred by the targeted value changes and the constant
external interferences. However, if the I action is excessively powerful, it will delay the responding
toward the swift variation. The P action could be used solely on the loading system that
possesses the integral components.
 PD Control: when deviation occurred, the system will immediately generate some operation load
that is greater than the load generated single handedly by the D action to restrain the increment of
the deviation. If the deviation is small, the effectiveness of the P action will be decreasing as well.
The control objects include occasions with integral component loads, which are controlled by the
P action only, and sometimes, if the integral component is functioning, the whole system will be
vibrating. On such occasions, in order to make the P action's vibration subsiding and the system
stabilizing, the PD control could be utilized. In other words, this control is good for use with
loadings of no brake functions over the processes.
 PID Control: Utilize the I action to eliminate the deviation and the D action to restrain the vibration,
thereafter, combine with the P action to construct the PID control. Use of the PID method could
obtain a control process with no deviations, high accuracies and a stable system.
0: Serial connection
1: Parallel connection
Chapter 12 Description of Parameter SettingsC2000 Series
139
Factory Setting: 0