GE AF-650 GP Programming Manual page 137
General purpose drive
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Parameter Descriptions
PI-20 Process CL Feedback 1 Resource
Option:
3
3
[0]
No function
*
[1]
Analog Input 53
[2]
Analog Input 54
[3]
Frequency input 29
[4]
Frequency input 33
[7]
Analog Input X30/11 (OPCGPIO)
[8]
Analog Input X30/12 (OPCGPIO)
PI-22 Process CL Feedback 2 Resource
Option:
[0]
No function
*
[1]
Analog Input 53
[2]
Analog Input 54
[3]
Frequency input 29
[4]
Frequency input 33
[7]
Analog Input X30/11 (OPCGPIO)
[8]
Analog Input X30/12 (OPCGPIO)
3.21.4 PI-3# Process PID Control
Parameters to configure the Process PID Controls.
PI-30 Process PID Normal/ Inverse Control
Option:
[0]
Normal Sets process control to increase the output
*
[1]
Inverse Sets process control to reduce the output
PI-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.
136
Function:
of the first of these signals. The
second input signal is defined in
PI-22 Process CL Feedback 2 Resource.
Function:
The effective feedback signal is made
up of the sum of up to two different
input signals. Select which frequency
converter input should be treated as
the source of the second of these
signals. The first input signal is
defined in PI-20 Process CL Feedback 1
Resource.
Function:
Normal and inverse control are implemented by
introducing a difference between the reference
signal and the feedback signal.
frequency.
frequency.
AF-650 GP Programming Guide
PI-32 Process PID Start Speed
Range:
0 RPM
*
PI-33 Process PID Proportional Gain
Range:
0.01
*
PI-34 Process PID Integral Time
Range:
10000 s
*
PI-35 Process PID Differentiation Time
Range:
0 s
[0 - 10 s] Enter the PID differentiation time. The differen-
*
PI-36 Process PID Diff. Gain Limit
Range:
5
[1 - 50] Enter a limit for the differentiator gain (DG). If there
*
PI-38 Process PID Feed Forward Factor
Range:
0 %
*
200 %]
DET-618C
Function:
[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.
Function:
[0 - 10] Enter the PID proportional gain. The proportional
gain multiplies the error between the set point
and the feedback signal.
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:
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:
is no limit, the DG will increase when there are fast
changes. Limit the DG to obtain a pure differen-
tiator gain at slow changes and a constant
differentiator gain where fast changes occur.
Function:
[0 -
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.
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