Danfoss VLT AutomationDrive FC 301 Programming Manual page 263

VLT AutomationDrive FC 301/302
Programming Guide
Parameter 7-34 Process PID Integral Time
Table 466: Parameter 7-34 Process PID Integral Time
7-34 Process PID Integral Time
Default value: 10000 s
Conversion index: -2
Enter the PID integral time. The integrator provides an increasing gain at a constant error between 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.
Parameter 7-35 Process PID Differentiation Time
Table 467: Parameter 7-35 Process PID Differentiation Time
7-35 Process PID Differentiation Time
Default value: 0 s
Conversion index: -2
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.
Parameter 7-36 Process PID Diff. Gain Limit
Table 468: Parameter 7-36 Process PID Diff. Gain Limit
7-36 Process PID Diff. Gain Limit
Default value: 5
Conversion index: -1
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 differentiator gain at slow changes and a constant differentiator gain where fast changes occur, limit the differentiator gain.
Parameter 7-38 Process PID Feed Forward Factor
Table 469: Parameter 7-38 Process PID Feed Forward Factor
7-38 Process PID Feed Forward Factor
Default value: 0%
Conversion index: 0
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.
Parameter 7-39 On Reference Bandwidth
Table 470: Parameter 7-39 On Reference Bandwidth
7-39 On Reference Bandwidth
Default value: 5%
Conversion index: 0
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.
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Parameter type: Range, 0.01 - 10000 s
Data type: Uint32
Parameter type: Range, 0 - 10 s
Data type: Uint16
Parameter type: Range, 1 - 50
Data type: Uint16
Parameter type: Range, 0 - 200%
Data type: Uint16
Parameter type: Range, 0 - 200%
Data type: Uint8
Parameter Descriptions
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
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