Danfoss VLT AutomationDrive FC 361 Programming Manual page 93

Parameter Descriptions
7-35 Process PID Differentiation Time
Range: Function:
0 s [0 - 10 s] 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 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 differ-
entiator gain increases when there
are fast changes. To obtain a pure
differentiator 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 - 200 %] Enter the PID feed forward factor.
*
The 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 feed forward
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 - 200 %] Enter the on-reference bandwidth.
*
When the 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.
MG06J202
Programming Guide
4.8.4 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]
*
[1]
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:
No
Yes Select [1] Yes to reset the I-part of
the process PID 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 - par. Enter a negative limit for the
7-42 %] process PID controller output.
Function:
[ par. 7-41 - Enter a positive limit for the process
100 %] PID controller output.
Function:
[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
(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 - 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
(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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