Danfoss VLT AutomationDrive FC 302 Programming Manual page 115

Parameter Descriptions
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 [0 - The feed forward is used to obtain the desired level,
*
100 ] 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
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
choices. In winder applications, the feed fwd factor is
typically the line speed of the system.
7-52 Process PID Feed Fwd Ramp up
Range: Function:
0.01 s [0.01 - 10 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 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 Set a time constant for the reference
*
s] 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 Set a time constant for the feedback first-
*
s] 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.
®
VLT AutomationDrive FC 301/302 Programming Guide
MG33MI02 - Rev. 2013-11-20
3 3
113