7-22 Process CL Feedback 2 Resource
Option:
Function:
[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 -
6000
RPM]
Enter the motor speed to be attained as a
start signal for commencement of PID
control. When the power is switched on, the
will commence ramping and then operate
under speed open loop control. Thereafter,
when the Process PID start speed is reached,
the will change over to Process PID control.
7-33 Process PID Proportional Gain
Range:
Function:
0.01
*
[0.00 - 10.00 ] Enter the PID proportional gain. The
proportional gain multiplies the error
between the set point and the feedback
signal.
7-34 Process PID Integral Time
Range:
Function:
10000.00 s
*
[0.01 -
10000.00 s]
Enter the PID integral time. The
integrator provides an increasing
gain at a constant error between the
set point and the feedback signal.
The integral time is the time needed
7-34 Process PID Integral Time
Range:
Function:
by the integrator to reach the same
gain as the proportional gain.
7-35 Process PID Differentiation Time
Range:
Function:
0.00 s
*
[0.00 -
10.00 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 differ-
entiation time, the stronger the gain from
the differentiator.
7-36 Process PID Diff. Gain Limit
Range:
Function:
5.0
*
[1.0 -
50.0 ]
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.
7-38 Process PID Feed Forward Factor
Range:
Function:
0 %
*
[0 -
200 %]
Enter the PID feed forward (FF) factor. The FF
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
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
set value of this parameter the On Reference
status bit is high, i.e. =1.
3.9.5 7-4* Advanced Process PID Ctrl.
Parameter group 7-4* is only used if
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
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
102
MG33ME02 - VLT
®
is a registered Danfoss trademark
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