Delta Electronics VFD-E manual 10.06, 10.07, 10.08

Chapter 4 Parameters
10.06	Primary Delay Filter Time		Unit: 0.1
	Settings	0.0 to 2.5 sec	Factory Setting: 0.0

To avoid amplification of measurement noise in the controller output, a derivative digital filter is inserted. This filter helps to dampen oscillations.

The complete PID diagram is in the following:

+

P

I

Integral

+

Output

Digital

gain

+

Freq.

Freq.

filter

Setpoint

limit

Limit

Command

-

10.02

10.03

10.05

+

10.07

10.06

D

10.04

Input Freq.

PID

Gain

feedback

10.10

10.01

10.07	PID Output Frequency Limit		Unit: 1
	Settings	0 to 110 %	Factory Setting: 100

This parameter defines the percentage of output frequency limit during the PID control. The formula is Output Frequency Limit = Maximum Output Frequency (Pr.01.00) X Pr.10.07 %. This parameter will limit the Maximum Output Frequency. An overall limit for the output frequency can be set in Pr.01.07.

10.08	PID Feedback Signal Detection Time		Unit: 0.1
	Settings	0.0 to d 3600 sec	Factory Setting: 60.0

This parameter defines the time during which the PID feedback must be abnormal before a warning (see Pr.10.09) is given. It also can be modified according to the system feedback signal time.

If this parameter is set to 0.0, the system would not detect any abnormality signal.

10.09Treatment of the Erroneous Feedback Signals (for PID feedback error)

Factory Setting: 0

Settings	0	Warning and RAMP to stop
	1	Warning and COAST to stop
	2	Warning and keep operating

4-134 Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11