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 will automatically revert to [0]
No. Resetting the I-part makes it possible to start from
a welldefined point after changing something in the
process, e.g. changing a textile roll.
7-41 Process PID Output Neg. Clamp
Range: Function:
-100 %* [ -100 - par. 7-42 %] Enter a negative limit for the
process PID controller output.
7-42 Process PID Output Pos. Clamp
Range: Function:
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 - 100
%]
Enter a scaling percentage to apply to the
process PID output when operating at the
minimum 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.).
7-44 Process PID Gain Scale at Max. Ref.
Range: Function:
100 %* [0 - 100
%]
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.).
7-45 Process PID Feed Fwd Resource
Option: Function:
[0] * No function Select which drive 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.
[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
7-45 Process PID Feed Fwd Resource
Option: Function:
[32] Bus PCD
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]).
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 FF resource as a
negative value.
7-48 PCD Feed Forward
Range: Function:
0 * [0 - 65535 ]
Read-out parameter where the bus
7-45 Process PID Feed Fwd Resource [32]) can
be read.
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.
3.9.6 7-5*Ext. Process PID Ctrl.
Parameter group 7-5* 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: 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:
1.00 * [0.00 -
100.00 ]
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 to
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
MG33ME02 - VLT
®
is a registered Danfoss trademark 103
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