Pid Controller - Danfoss VLT FC 102 Programming Manual

Programming Guide | VLT® HVAC Drive FC 102

20-9* PID Controller

6.20.8
This parameter group enables manual adjustment of the PID controller. By adjusting the PID controller parameters, the control
performance may be improved.
20-91 PID Anti Windup
Default value: [1] On
Setup: All setups
Data type: Uint8
Option [1] On is activated automatically if 1 of the following options is selected in parameters in parameter group 21-** Ext. Closed
Loop: [0] Normal, [X] Enabled Ext CLX PID.
Option Name
[0] Off
[1]* On
20-93 PID Proportional Gain
Default value: 0.50
Setup:
All setups
Data type: Uint16
Always set the required value for parameter 20-14 Maximum Reference/Feedb. before setting the values for the PID controller in
parameter group 20-9* PID Controller.
The proportional gain indicates the number of times the error between the setpoint and the feedback signal is to be applied. If (error
x gain) jumps with a value equal to what is set in parameter 20-14 Maximum Reference/Feedb., the PID controller tries to change
the output speed equal to what is set in parameter 4-13 Motor Speed High Limit [RPM]/parameter 4-14 Motor Speed High Limit [Hz].
However, the output speed is limited by this setting.
Calculate the proportional band (error causing output to change from 0–100%) with this formula:
20-94 PID Integral Time
Default value: 20 s
© 2024.10
Parameter type:
Conversion index:
Change during operation:
NOTICE
Description
The integrator continues to change value also after output has
reached 1 of the extremes. This can afterwards cause a delay of
change of the output of the controller.
The integrator is locked if the output of the built-in PID controller
has reached 1 of the extremes (minimum or maximum value)
and therefore is not able to add further changes to the value of
the process parameter controlled. This allows the controller to
respond more quickly when it can control the system again.
Parameter type:
Conversion index:
Change during operation:
NOTICE
Parameter type:
Parameter Descriptions
Option
–
True
Range, 0=Off - 10
-2
True
Range, 0.01 - 10000 s
AU430028034214en-001901 / 130R0310 | 465