Danfoss VLT AutomationDrive FC 301 Programming Manual page 267

VLT AutomationDrive FC 301/302
Programming Guide
Parameter 7-51 Process PID Feed Fwd Gain
Table 481: Parameter 7-51 Process PID Feed Fwd Gain
7-51 Process PID Feed Fwd Gain
Default value: 1
Conversion index: -2
The feed forward is used to obtain the required level based on a well-known signal available. The PID controller then only takes care
of the smaller part of the control, necessary because of unknown characters. The standard feed-forward factor in parameter 7-38
Process PID Feed Forward Factor is always related to the reference, whereas parameter 7-51 Process PID Feed Fwd Gain has more op-
tions. In winder applications, the feed-forward factor is typically the line speed of the system.
Parameter 7-52 Process PID Feed Fwd Ramp Up
Table 482: Parameter 7-52 Process PID Feed Fwd Ramp Up
7-52 Process PID Feed Fwd Ramp Up
Default value: 0.01 s
Conversion index: -2
Controls the dynamics of the feed-forward signal when ramping up.
Parameter 7-53 Process PID Feed Fwd Ramp Down
Table 483: Parameter 7-53 Process PID Feed Fwd Ramp Down
7-53 Process PID Feed Fwd Ramp Down
Default value: 0.01 s
Conversion index: -2
Controls the dynamics of the feed-forward signal when ramping down.
Parameter 7-56 Process PID Ref. Filter Time
Table 484: Parameter 7-56 Process PID Ref. Filter Time
7-56 Process PID Ref. Filter Time
Default value: 0.001 s
Conversion index: -3
Set a time constant for the reference first-order low-pass filter. The low-pass filter improves steady-state performance and dampens
oscillations on the reference/feedback signals. However, severe filtering can be detrimental to dynamic performance.
Parameter 7-57 Process PID Fb. Filter Time
Table 485: Parameter 7-57 Process PID Fb. Filter Time
7-57 Process PID Fb. Filter Time
Default value: 0.001 s
Conversion index: -3
Set a time constant for the feedback first-order low-pass filter. The low-pass filter improves steady-state performance and dampens
oscillations on the reference/ feedback signals. However, severe filtering can be detrimental to dynamic performance.
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Parameter type: Range, 0 - 100
Data type: Uint16
Parameter type: Range, 0.01 - 10 s
Data type: Uint32
Parameter type: Range, 0.01 - 10 s
Data type: Uint32
Parameter type: Range, 0.001 - 1 s
Data type: Uint16
Parameter type: Range, 0.001 - 1 s
Data type: Uint16
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
Setup: All setups
Change during operation: True
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