Danfoss VLT AutomationDrive FC 360 Programming Manual page 79

Parameter Descriptions
7-35 Process PID Differentiation Time
Range: Function:
0 s [0 - 20 s] Enter the PID differentiation time. The differen-
*
tiator does not react to a constant error, but
provides a gain only when the error changes.
The shorter the PID differentiation time, the
stronger the gain from the differentiator.
7-36 Process PID Diff. Gain Limit
Range: Function:
5 [1 - 50] Enter a limit for the differentiator gain. If there is
*
no limit, the differentiator gain increases when
there are fast changes. To obtain a pure differen-
tiator gain at slow changes and a constant
differentiator gain where fast changes occur, limit
the differentiator gain.
7-38 Process PID Feed Forward Factor
Range: Function:
0 % [0 - Enter the PID feed forward (FF) factor. The FF
*
200 %] factor sends a constant fraction of the reference
signal to bypass the PID control, so the PID
control only affects the remaining fraction of the
control signal. Any change to this parameter
affects the motor speed. When the FF factor is
activated, it provides less overshoot, and high
dynamics when changing the setpoint.
Parameter 7-38 Process PID Feed Forward Factor is
active when parameter 1-00 Configuration Mode
is set to [3] Process.
7-39 On Reference Bandwidth
Range: Function:
5 % [0 - Enter the on-reference bandwidth. When the
*
200 %] PID control error (the difference between the
reference and the feedback) is less than the
value of this parameter, the on-reference
status bit is 1.
MG06C702
Programming Guide
4.8.5 7-4* Advanced Process PID Ctrl.
This parameter group is only used if parameter 1-00 Config-
uration Mode is set to [7] Extended PID speed CL.
7-40 Process PID I-part Reset
Option:
[0] No
*
[1] Yes Select [1] Yes to reset the I-part of the process PID
7-41 Process PID Output Neg. Clamp
Range:
-100 %
*
7-42 Process PID Output Pos. Clamp
Range:
100 %
*
7-43 Process PID Gain Scale at Min. Ref.
Range:
100 %
*
7-44 Process PID Gain Scale at Max. Ref.
Range:
100 %
*
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Function:
controller. The selection automatically returns to [0]
No. Resetting the I-part makes it possible to start from
a well-defined point after changing something in the
process, for example changing a textile roll.
Function:
[ -100 - 100 %] Enter a negative limit for the process
PID controller output.
Function:
[ -100 - 100 %] Enter a positive limit for the process
PID controller output.
Function:
[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.).
Function:
[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.).
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