3.9.6 7-5* Process PID Ctrl.
Parameter group 7-5* is only used if par. 1-00 Configuration
Mode is set to [7] Extended PID speed CL or [8] Extended PID
Speed OL.
7-50 Process PID Extended PID
Option:
Function:
[0]
Disabled Disables the extended parts of the process PID
controller.
[1]
*
Enabled
Enables the extended parts of the PID controller.
7-51 Process PID Feed Fwd Gain
Range:
Function:
1.00
*
[0.00 -
100.00 ]
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
smaller 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.
7-52 Process PID Feed Fwd Ramp-up
Range:
Function:
0.01 s
*
[0.01 - 10.00 s] Controls the dynamics of the feed
forward signal when ramping up.
7-53 Process PID Feed Fwd Ramp-down
Range:
Function:
0.01 s
*
[0.01 - 10.00 s] Controls the dynamics of the feed
forward signal when ramping down.
7-56 Process PID Ref. Filter Time
Range:
Function:
0.001 s
*
[0.001 -
1.000 s]
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.
7-57 Process PID Fb. Filter Time
Range:
Function:
0.001 s
*
[0.001 -
1.000 s]
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.
Parameter Descriptions
FC 300 Programming Guide
3-80
MG.33.MA.22 - VLT
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is a registered Danfoss trademark
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