Danfoss VLT AutomationDrive FC 301 Programming Manual page 129

Parameter Descriptions
7-42 Process PID Output Pos. Clamp
Range:
100 % [ par. 7-41 - 100 %] Enter a positive limit for the
*
process PID controller output.
7-43 Process PID Gain Scale at Min. Ref.
Range: Function:
100 % [0 - Enter a scaling percentage to apply to the
*
100 %] process PID output when operating at the
minimum reference. The scaling percentage is
adjusted linearly between the scale at
minimum reference (parameter 7-43 Process PID
Gain Scale at Min. Ref.) and the scale at
maximum reference (parameter 7-44 Process
PID Gain Scale at Max. Ref.).
7-44 Process PID Gain Scale at Max. Ref.
Range: Function:
100 % [0 - Enter a scaling percentage to apply to the
*
100 %] process PID output when operating at the
maximum reference. The scaling percentage is
adjusted linearly between the scale at
minimum reference (parameter 7-43 Process PID
Gain Scale at Min. Ref.) and the scale at
maximum reference (parameter 7-44 Process
PID Gain Scale at Max. Ref.).
7-45 Process PID Feed Fwd Resource
Option: Function:
[0] No function Select which frequency converter input
*
should be used as the feed forward
factor. The factor is added to the output
of the PID controller. This increases
dynamic performance.
[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
[29] Analog Input
X48/2
[32] Bus PCD Selects a fieldbus reference configured
by parameter 8-02 Control Word Source.
Change parameter 8-42 PCD Write
Configuration for the bus used to make
the feed-forward available in
parameter 7-48 PCD Feed Forward. Use
MG33ML02
Programming Guide
Function:
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7-45 Process PID Feed Fwd Resource
Option: Function:
index 1 for feed forward [748] (and
index 2 for reference [1682]).
[36] MCO
7-46 Process PID Feed Fwd Normal/ Inv. Ctrl.
Option: Function:
[0] Normal Select [0] Normal to set the feed-forward factor to
*
treat the FF resource as a positive value.
[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.
3.9.7 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 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 required
*
100] 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.
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