Danfoss VLT AutomationDrive FC 302 Programming Manual page 118

Parameter Descriptions
7-46 Process PID Feed Fwd Normal/ Inv. Ctrl.
Option:
[0] Normal Select [0] Normal to set the feed-forward factor to
*
[1] Inverse Select [1] Inverse to treat the feed forward resource
3 3
7-48 PCD Feed Forward
Range:
0 [0 - 65535] Readout parameter where the bus
*
7-49 Process PID Output Normal/ Inv. Ctrl.
Option:
[0] Normal Select [0] Normal to use the resulting output from
*
[1] Inverse Select [1] Inverse to invert the resulting output
3.9.6 7-5* Ext. Process PID Ctrl.
This parameter group is only used if parameter 1-00 Config-
uration Mode is set to [7] Extended PID speed CL or [8]
Extended PID Speed OL.
7-50 Process PID Extended PID
Option:
[0] Disabled Disables the extended parts of the process PID
[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 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
choices. In winder applications, the feed-forward
factor is typically the line speed of the system.
7-52 Process PID Feed Fwd Ramp up
Range:
0.01 s [0.01 - 10 s] Controls the dynamics of the feed-forward
*
116
Function:
treat the FF resource as a positive value.
as a negative value.
Function:
parameter 7-45 Process PID Feed Fwd Resource
[32]) can be read.
Function:
the process PID controller as is.
from the process PID controller. This operation is
performed after the feed-forward factor is applied.
Function:
controller.
Function:
signal when ramping up.
Danfoss A/S © Rev. 10/2014 All rights reserved.
®
VLT AutomationDrive FC 301/302
7-53 Process PID Feed Fwd Ramp down
Range:
0.01 s
*
7-56 Process PID Ref. Filter Time
Range:
0.001 s
*
7-57 Process PID Fb. Filter Time
Range:
0.001 s
*
Function:
[0.01 - 10 s] Controls the dynamics of the feed-forward
signal when ramping down.
Function:
[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.
Function:
[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.
MG33MJ02