08-08

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

Chapter 4 Parameters

	PID Cancelled
	08-00=0	Output
	or 02-01~06=21(pid off)	Output
	or 02-01~06=21(pid off)

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

AUI /PG

P	D	+
Proportion	Differential

gain	Time

08-01	08-03	+
I
08-02	08-04
Integral Time	uppe r limit
	for
	Int egral

PID offset 08-06

PID
Delay	08-05
Time	08-05
08-07	PID Freq.
	out put
	command
	limit
Treatme nt o f t he
Feedback Signal Fau lt
If Hz>08 -05
time over0 8-08
=>08-09

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.

Feedback Signal Detection Time

Unit: 0.1

Revision August 2008, 03VE, SW V2.04

4-121

VFD-VE Series specifications

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Delta Electronics VFD-VE Series manual 08-08, Feedback Signal Detection Time Unit

Models: VFD-VE Series