Delta Electronics VFD-EL manual 10.06, 10.07

Unit: 0.1 Factory Setting: 60.0

Chapter 4 Parameters

This parameter defines an upper bound or limit for the integral gain (I) and therefore limits the Master Frequency.

The formula is: Integral upper bound = Maximum Output Frequency (Pr.01.00) x (Pr.10.05). This parameter can limit the Maximum Output Frequency.

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

Settings 0.0 to d 3600 sec

This function in only for ACI signal.

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.

4-102 Revision August 2008, 2ELE, V1.02