Danfoss VLT AutomationDrive FC 300 Programming Manual page 111

Parameter Descriptions
7-22 Process CL Feedback 2 Resource
Option: Function:
the source of the second of these
signals. The first input signal is
defined in 7-20 Process CL Feedback 1
Resource.
[0] No function
[1] Analog Input 53
[2] Analog Input 54
[3] Frequency input 29
[4] Frequency input 33
[7] Analog Input X30/11
[8] Analog Input X30/12
[15] Analog Input X48/2
3.9.4 7-3* Process PID Ctrl.
7-30 Process PID Normal/ Inverse Control
Option: Function:
Normal and inverse control are implemented by
introducing a difference between the reference
signal and the feedback signal.
[0] Normal Sets process control to increase the output
frequency.
[1] Inverse Sets process control to reduce the output frequency.
7-31 Process PID Anti Windup
Option: Function:
[0] Off Continues regulation of an error even when the output
frequency cannot be increased or decreased.
[1] On Ceases regulation of an error when the output
frequency can no longer be adjusted.
7-32 Process PID Start Speed
Range: Function:
0 RPM [0 - Enter the motor speed to be attained as a
*
6000 start signal for commencement of PID
RPM] control. When the power is switched on, the
frequency converter will commence ramping
and then operate under speed open loop
control. Thereafter, when the Process PID
start speed is reached, the frequency
converter will change over to Process PID
control.
7-33 Process PID Proportional Gain
Range: Function:
0.01 [0 - 10 ] Enter the PID proportional gain. The propor-
*
tional gain multiplies the error between the set
point and the feedback signal.
®
VLT AutomationDrive Programming Guide
7-34 Process PID Integral Time
Range:
10000 s
7-35 Process PID Differentiation Time
Range:
0 s
7-36 Process PID Diff. Gain Limit
Range:
5
7-38 Process PID Feed Forward Factor
Range:
0 %
7-39 On Reference Bandwidth
Range:
5 %
3.9.5 7-4* Advanced Process PID Ctrl.
This parameter group is only used if 1-00 Configuration
Mode is set to [7] Extended PID speed CL or [8] Extended PID
Speed OL.
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Function:
[0.01 - Enter the PID integral time. The
*
10000 s] integrator provides an increasing gain at
a constant error between the set point
and the feedback signal. The integral
time is the time needed by the
integrator to reach the same gain as the
proportional gain.
Function:
[0 - 10 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.
Function:
[1 - 50 ] 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:
[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 will
thus affect the motor speed. When the FF factor
is activated it provides less overshoot, and high
dynamics when changing the set point.
7-38 Process PID Feed Forward Factor is active
when 1-00 Configuration Mode is set to [3]
Process.
Function:
[0 - 200 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. =1.
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