Feedback Signal Detection Time; Pi Control; Pd Control; Pid Control - Delta Electronics AC Motor Drive VFD-VE Series User Manual

Vfd-ve series high performance field oriented control ac motor drive

Table of Contents

Inp ut Selection of the

PID Targe ted Value

00-20:KPV-C E0 1/

RS485

03-00~0 2: UP/D own

ke y PG

Display of th e PID fee dback

00- 14=1 0 display o f t he

PID feed back

Inp ut Selection

of the PID Fee dback

08- 00:AVI/ACI

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 with 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.

08-08