Danfoss VLT AutomationDrive FC 301 Programming Manual page 108

Parameter Descriptions
7-40 Process PID I-part Reset
Option: Function:
[1] Yes Select [1] Yes to reset the I-part of the process PID
controller. The selection automatically reverts to [0]
No. Resetting the I-part makes it possible to start from
3 3
a well-defined point after changing something in the
process, e.g. changing a textile roll.
7-41 Process PID Output Neg. Clamp
Range:
-100 % [ -100 - par. 7-42
*
%]
7-42 Process PID Output Pos. Clamp
Range:
100 % [ par. 7-41 - 100
*
%]
7-43 Process PID Gain Scale at Min. Ref.
Range:
100 % [0 -
*
100 %]
7-44 Process PID Gain Scale at Max. Ref.
Range:
100 % [0 -
*
100 %]
7-45 Process PID Feed Fwd Resource
Option:
[0] No function
*
[1] Analog Input 53
[2] Analog Input 54
[7] Frequency input 29
[8] Frequency input 33
[11] Local bus reference
[20] Digital pot.meter
[21] Analog input X30-11
[22] Analog input X30-12
106
VLT
Function:
Enter a negative limit for the
process PID controller output.
Function:
Enter a positive limit for the process
PID controller output.
Function:
Enter a scaling percentage to apply to the
process PID output when operating at the
minimum reference. The scaling percentage is
adjusted linearly between the scale at min. ref.
(7-43 Process PID Gain Scale at Min. Ref.) and the
scale at max. ref. (7-44 Process PID Gain Scale at
Max. Ref.).
Function:
Enter a scaling percentage to apply to the
process PID output when operating at the
maximum reference. The scaling percentage will
be adjusted linearly between the scale at min.
ref. (7-43 Process PID Gain Scale at Min. Ref.) and
the scale at max. ref. (7-44 Process PID Gain Scale
at Max. Ref.).
Function:
Select which frequency converter
input should be used as the feed
forward factor. The FF factor is added
directly to the output of the PID
controller. This increases dynamic
performance.
®
AutomationDrive FC 301/302 Programming Guide
7-45 Process PID Feed Fwd Resource
Option:
[29] Analog Input X48/2
[32] Bus PCD
[36] MCO
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 FF resource as a
7-48 PCD Feed Forward
Range:
0 [0 - 65535 ] Read-out parameter where the bus 7-45 Process
*
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 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:
[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:
1 [0 -
*
100 ]
MG33MH02 - Rev. 2013-09-30
Function:
Selects a bus reference configured by
8-02 Control Word Source. Change
8-42 PCD Write Configuration for the
bus used in order to make the feed-
forward available in 7-48 PCD Feed
Forward. Use index 1 for feed-forward
[748] (and index 2 for reference
[1682]).
Function:
treat the FF resource as a positive value.
negative value.
Function:
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:
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
7-38 Process PID Feed Forward Factor is always related