7-41 Process PID Output Neg. Clamp
Range:
Function:
-100 %
*
[ -100 - 100 %] Enter a negative limit for the process
PID controller output.
7-42 Process PID Output Pos. Clamp
Range:
Function:
100 %
*
[ -100 - 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 is
adjusted linearly between the scale at
minimum reference (
) and the scale at
maximum reference (
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 is
adjusted linearly between the scale at
minimum reference (
) and the scale at
maximum reference (
7-45 Process PID Feed Fwd Resource
Option:
Function:
Select which frequency converter input
is used as the feed forward factor. The
FF factor is added directly to the
output of the PID controller. This
parameter can increase dynamic
performance.
[0]
*
No function
[1]
Analog Input 53
[2]
Analog Input 54
[7]
Frequency input 29
[8]
Frequency input 33
[11] Local bus reference
[32] Bus PCD
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 ] Readout parameter where the bus
parameter 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.
4.8.6 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
.
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 -
100 ]
The feed forward is used to obtain the 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.
7-52 Process PID Feed Fwd Ramp up
Range:
Function:
0.01 s
*
[0.01 - 100 s] Controls dynamics of the feed forward
signal when ramping up.
7-53 Process PID Feed Fwd Ramp down
Range:
Function:
0.01 s
*
[0.01 - 100 s] Controls the dynamics of the feed
forward signal when ramping down.
7-56 Process PID Ref. Filter Time
Range:
Function:
0.001 s
*
[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
Parameter Descriptions
Programming Guide
MG06C602
Danfoss A/S © 7/2015 All rights reserved.
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