Danfoss VLT AQUA Design Manual page 28

2. Introduction to VLT AQUA Drive
Type of Control
PI-control
PID tight control
PID some overshoot
2
Ziegler Nichols tuning for regulator, based on a stability boundary.
Experience has shown that the control setting according to Ziegler Nichols rule provides a good closed loop response for many systems. If necessary,
the operator can do the final tuning of the control iteratively to modify the response of the control loop.
2.9.8. Reference Handling
A block diagram of how the drive produces the Remote Reference is shown below.
28
Proportional Gain
K
0.45 *
u
K
0.6 *
u
K
0.33 *
u
®
MG.20.N3.02 - VLT is a registered Danfoss trademark
VLT
Integral Time
P
0.833 *
u
P
0.5 *
u
P
0.5 *
u
®
AQUA Drive Design Guide
Differentiation Time
-
P
0.125 *
u
P
0.33 *
u