Delta Electronics VFD-EL manual 10.21, 10.22, 10.23

Chapter 4 Parameters

+

Setpoint

-

Input Freq.

Gain

10.10

P

10.02

I

10.03

D

10.04

	+		Output
Integral
gain	+		Freq .
limit			Limit
10.05	+	10.07

PID feedback

10.01

Digital filter

10.06

Freq . Command

10.20Treatment of the Erroneous PID Feedback Level

Factory Setting: 0

Settings	0	Keep operating
	1	Coast to stop
	2	Ramp to stop
	3	Ramp to stop and restart after time set in Pr.10.21

In PID control mode, it will act according to Pr.10.20 when erroneous PID feedback level occurs.

10.21	Restart Delay Time after Erroneous PID Deviation Level		Unit: 1
	Settings	1 to 9999 sec	Factory Setting: 60
10.22	Set Point Deviation Level		Unit: 1
	Settings	0 to 100%	Factory Setting: 0
10.23	Detection Time of Set Point Deviation Level		Unit: 1
	Settings	1 to 9999 sec	Factory Setting: 10

When the deviation is less than Pr.10.22 (in the range of PID set point to Pr.10.22 X PID set point) for a time exceeding the setting of Pr.10.23, the AC motor drive will decelerate to stop to be constant pressure status (This deceleration time is the setting of Pr.01.12). The system will be ready when the deviation is within the range of PID set point to Pr.10.22 X PID set point during deceleration.

4-106 Revision August 2008, 2ELE, V1.02