Proportional Gain (P); Integral Time (I); Differential Time (D); Upper Bound For Integral Control - Delta Electronics AC Drive VFD-F Series User Manual

When this parameter is set to 01: when positive control, the deviation equation is deviation
= detection signal – target value. When increasing output frequency will decrease detection
value, this setting should be chose.
10 - 03

Proportional Gain (P)

Settings
This parameter is to set proportional gain (P). This gain determines the response degree of
P controller to feedback deviation. If gain value is large, the response is fast. But if the gain
value is too great, oscillation will occur. If gain value is small, the response is slow.
10 - 04

Integral Time (I)

Settings
This parameter is set to integral gain of I controller. When much integral time is to be set,
the gain of I controller is small and the response is slow. The control ability to external is
poor. When less integral time is to be set, the gain of I controller is large and the response is
fast. The control ability to external is fast.
If the setting of integral time is too small, output frequency and system may occur
oscillation.
If integral time is set to 0.00, I controller is closed.
10 - 05

Differential Time (D)

Settings
This parameter is set to D controller gain. This gain determines D controller to the response
of change of deviation. Suitable differential time could decrease overshoot of P and I
controller. The oscillation will be attenuation and steady quickly. But if much differential time
is to be set, it may cause system oscillation.
Interference immunity ability is poor due to differential controller activates to change of
deviation. It's not recommended to use, especially during interferences.
10 - 06

Upper Bound for Integral Control

Settings
This parameter could set the upper bound of I controller. In other words, upper bound for
integral control = (01-00) X (10-04) %
10 - 07 Primary Low Pass Filter Time
Settings
This parameter determines primary Low Pass filter time.
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
0.0~10.0
0.00~100.00 Sec
0.00~1.00 Sec
00~200%
0.0~2.5 Sec
5-61
VFD-F Series
Factory Setting: 1.0
Unit: 0.1
Factory Setting: 1.00
Unit: 0.01
Factory Setting: 0.00
Unit: 0.01
Factory Setting: 100
Unit: 1
Factory Setting: 0.0
Unit: 0.1
5