Speed Pid Control; The Following Parameters Are Relevant For The Speed Control - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

Speed PID Control

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The table shows the control configurations where the Speed Control is active. To see where the
Speed Control is active, please refer to the section about the Control Structure.
Par. 1-00
Configuration
Mode
[0] Speed open
loop
[1] Speed closed
loop
[2] Torque
[3] Process
Note: "N.A." means that the specific mode is not available at all. "Not Active" means that the
specific mode is available but the Speed Control is not active in that mode.
Note: The Speed Control PID will work under the default parameter setting, but tuning the parameters
is highly recommended to optimize the motor control performance. The two Flux motor control
principles are specially dependant on proper tuning to yield their full potential.

The following parameters are relevant for the Speed Control:

Parameter
Feedback Resource Par.
7-00
Proportional Gain Par.
7-02
Integral Time Par. 7-03
Differentiation Time Par.
7-04
Differentiator Gain Limit
Par. 7-05
Lowpass Filter Time Par.
7-06
32
Introduction to FC 300
Par. 1-01 Motor Control Principle
U/f VVCplus
Not Active Not Active
N.A. ACTIVE
N.A. N.A.
N.A. Not Active
Description of function
Select from which resource (i.e. analog or pulse input) the Speed
PID should get its feedback
The higher the value - the quicker the control. However, too high
value may lead to oscillations.
Eliminates steady state speed error. Lower value means quick
reaction. However, too low value may lead to oscillations.
Provides a gain proportional to the rate of change of the feedback.
A setting of zero disables the differentiator.
If there are quick changes in reference or feedback in a given
application - which means that the error changes swiftly - the
differentiator may soon become too dominant. This is because it
reacts to changes in the error. The quicker the error changes, the
stronger the differentiator gain is. The differentiator gain can thus
be limited to allow setting of the reasonable differentiation time
for slow changes and a suitably quick gain for quick changes.
A low-pass filter that dampens oscillations on the feedback signal
and improves steady state performance. However, too large filter
time will deteriorate the dynamic performance of the Speed PID
control.
MG.33.B4.02 - VLT is a registered Danfoss trademark
Flux Sensorless Flux w/ enc.
feedb
ACTIVE N.A.
N.A. ACTIVE
N.A. Not Active
ACTIVE ACTIVE