Advanced Process Pid Ctrl.; Process Pid Differentiation Time; Process Pid Diff. Gain Limit; Process Pid Feed Forward Factor - Danfoss VLT AutomationDrive Programming Manual

Parameter Descriptions
7-34 Process PID Integral Time
Range:
3 3

7-35 Process PID Differentiation Time

Range:
0.00 s [0.00 -
*
10.00 s]

7-36 Process PID Diff. Gain Limit

Range:
5.0 [1.0 -
*
50.0 ]

7-38 Process PID Feed Forward Factor

Range:
0 % [0 -
*
200 %]
7-39 On Reference Bandwidth
Range:
5 % [0 - 200
*
%]
3-82
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FC 300 Programming Guide
Function:
the setpoint and the feedback
signal. The integral time is the time
needed by the integrator to reach
the same gain as the proportional
gain.
Function:
Enter the PID differentiation time. The
differentiator does not react to a constant
error, but provides a gain only when the
error changes. The shorter the PID differ-
entiation time, the stronger the gain from
the differentiator.
Function:
Enter a limit for the differentiator gain (DG). If
there is no limit, the DG will increase when
there are fast changes. Limit the DG to obtain
a pure differentiator gain at slow changes,
and a constant differentiator gain where fast
changes occur.
Function:
Enter the PID feed forward (FF) factor. The FF
factor sends a constant fraction of the reference
signal to bypass PID control, which means that
PID control only affects the remaining fraction of
the control signal. Any change to this parameter
will thus affect the motor speed. When the FF
factor is activated it provides less overshoot, and
high dynamics when changing the setpoint.
7-38 Process PID Feed Forward Factor is active
when 1-00 Configuration Mode is set to [3]
Process.
Function:
Enter the On Reference bandwidth. When the
PID control error (the difference between the
reference and the feedback) is less than the
set value of this parameter, the On Reference
status bit is high, i.e., it equals 1.
MG33MD22 - VLT

3.9.5 7-4* Advanced Process PID Ctrl.

Parameter group 7-4* is only used if 1-00 Configuration
Mode is set to [7] Extended PID speed CL or [8] Extended
PID Speed OL.
7-40 Process PID I-part Reset
Option: Function:
[0] No
*
[1] Yes Select Yes [1] to reset the I-part of the process PID
controller. The selection will automatically revert to No
[0]. Resetting the I-part makes it possible to start from
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 % [Application
*
dependant]
7-42 Process PID Output Pos. Clamp
Range:
100 % [Application
*
dependant]
7-43 Process PID Gain Scale at Min. Ref.
Range:
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:
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:
[0] No function
*
®
is a registered Danfoss trademark
Function:
Enter a negative limit for the
process PID controller output.
Function:
Enter a positive limit for the
process PID controller output.
Function:
Function:
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.