Advanced Process Pid Ctrl - Danfoss VLT AutomationDrive EZ FC 321 Programming Manual

VLT® AutomationDrive EZ FC 321
Programming Guide
Parameter 7-38 Process PID Feed Forward Factor
Table 392: Parameter 7-38 Process PID Feed Forward Factor
7-38 Process PID Feed Forward Factor
Default value: 0%
Conversion index: 0
Enter the PID feed-forward factor. The factor sends a constant fraction of the reference signal to bypass the PID control, so the PID
control only affects the remaining fraction of the control signal. Any change to this parameter affects the motor speed. When the
feed-forward factor is activated, it provides less overshoot and high dynamics when changing the setpoint. Parameter 7-38 Process
PID Feed Forward Factor is active when parameter 1-00 Configuration Mode is set to [3] Process.
Parameter 7-39 On Reference Bandwidth
Table 393: Parameter 7-39 On Reference Bandwidth
7-39 On Reference Bandwidth
Default value: 5%
Conversion index: 0
Enter the on-reference bandwidth. When the PID control error (the difference between the reference and the feedback) is less than
the value of this parameter, the on-reference status bit is 1.

4.8.7 7-4* Advanced Process PID Ctrl.

This parameter group is only used if parameter 1-00 Configuration Mode is set to [7] Extended PID speed CL or [8] Extended PID Speed
OL.
Parameter 7-40 Process PID I-part Reset
Table 394: Parameter 7-40 Process PID I-part Reset
7-40 Process PID I-part Reset
Default value: [0] No
Conversion index: –
Select the feedback source for the torque controller.
Option Name Description
[0]* No
[1] Yes
Select [1] Yes to reset the I-part of the process PID controller. The selection automatically returns to [0] No. Re-
setting the I-part makes it possible to start from a well-defined point after changing something in the process,
for example changing a textile roll.
Parameter 7-41 Process PID Output Neg. Clamp
Table 395: Parameter 7-41 Process PID Output Neg. Clamp
7-41 Process PID Output Neg. Clamp
Default value: -100%
Conversion index: 0
Enter a negative limit for the process PID controller output.
Danfoss A/S © 2021.08
Parameter type: Range, 0 - 20%
Data type: Uint16
Parameter type: Range, 0 - 200%
Data type: Uint8
Parameter type: Option
Data type: Uint8
Parameter type: Range, -100 - par. 7-42 %
Data type: Int16
Parameter Descriptions
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
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