Danfoss VLT AutomationDrive FC 301 Programming Manual page 183

Parameter Descriptions
7-46 Process PID Feed Fwd Normal/ Inv. Ctrl.
Option: Function:
[1] Inverse Select [1] Inverse to treat the feed-
forward resource as a negative
value.
7-48 PCD Feed Forward
Range: Function:
0 [0 - 65535 ] This parameter contains the value
*
of parameter 7-45 Process PID Feed
Fwd Resource [32] Bus PCD.
7-49 Process PID Output Normal/ Inv. Ctrl.
Option: Function:
[0] Normal Select [0] Normal to use the
*
resulting output from the process
PID controller as is.
[1] Inverse Select [1] Inverse to invert the
resulting output from the process
PID controller. This operation is
performed after the feed-forward
factor is applied.
3.8.8 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: Function:
[0] Disabled Disable the extended parts of the
process PID controller.
[1] Enabled Enable the extended parts of the
*
PID controller.
7-51 Process PID Feed Fwd Gain
Range: Function:
1 [0 - 100 ] 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 options. In winder
applications, the feed-forward factor
is typically the line speed of the
system.
M0013101
Programming Guide
7-52 Process PID Feed Fwd Ramp up
Range:
0.01 s
*
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
*
3.8.9 7-9* Position PI Ctrl.
Parameters for configuring the position controller.
7-90 Position PI Feedback Source
Option:
[0] Motor
*
feedb.
P1-02
[1] 24V
encoder
32/33
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Function:
[0.01 - 10 s] Controls the dynamics of the feed-
forward signal when ramping up.
Function:
[0.01 - 10 s] Controls the dynamics of the feed-
forward signal when ramping down.
Function:
[0.001 - 1 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.
Function:
[0.001 - 1 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.
Function:
NOTICE
This parameter is only available with
software version 48.XX.
Select the feedback source for the position PI
controller.
Use the feedback source selected as motor
feedback in parameter 1-02 Flux Motor Feedback
Source.
Single signal generated from 24 V High
Threshold Logic (HTL) encoder connected to
terminals 32 and 33. Configure the 24 V
encoder interface in parameter group 5.7* 24V
Encoder Input.
Program terminals 32/33 to [0] No operation.
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