Danfoss VLT AutomationDrive FC 300 Programming Manual page 135

3 Parameter descriptions
7-49 Process PID Output Normal/ Inv. Ctrl.
Option:
[0] * Normal
[1] Inverse
3
3.9.7 7-5* Process PID Ctrl.
7-50 Process PID Extended PID
Option:
[0] Disabled
[1] * Enabled
7-51 Process PID Feed Fwd Gain
Range:
1.00* [0.00 - 100.00 ]
7-52 Process PID Feed Fwd Ramp up
Range:
0.01 s* [0.01 - 10.00 s]
7-53 Process PID Feed Fwd Ramp down
Range:
0.01 s* [0.01 - 10.00 s]
7-56 Process PID Ref. Filter Time
Range:
0.001 s* [0.001 - 1.000 s]
7-57 Process PID Fb. Filter Time
Range:
0.001 s* [0.001 - 1.000 s]
134
Function:
Select Normal [0] to use the resulting output from the process PID controller as is.
Select Inverse [1] to invert the resulting output from the process PID controller. This operation is
performed after the feed forward factor is applied.
Function:
Disables the extended parts of the process PID controller.
Enables the extended parts of the PID controller.
Function:
The feed forward is used to obtain the desired level, based on a well-known signal available. The
PID controller then only takes care of the smaler part of the control, necessary because of unknown
characters. The standard feed fwd factor in par. 7-38 is always related to the reference whereas
7-51 has more choices. In winder applications, the feed fwd factor will typically be the line speed
of the system.
Function:
Controls the dynamics of the feed forward signal when ramping up.
Function:
Controls the dynamics of the feed forward signal when ramping down.
Function:
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.
Function:
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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FC 300 Programming Guide