The following parameters are relevant for the Speed Control:
Parameter
Description of function
Par. PI-00
Speed PID Feedback Source
Select from which input the Speed PID should get its feedback.
Par. PI-02
Speed PID Proportional Gain
The higher the value - the quicker the control. However, too high value may lead to oscillations.
Par. PI-03
Speed PID Integral Time
Eliminates steady state speed error. Lower value means quick reaction. However, too low value may lead to oscilla-
tions.
Par. PI-04
Speed PID Differentiation
Time
Provides a gain proportional to the rate of change of the feedback. A setting of zero disables the differentiator.
Par. PI-05
Speed PID Diff. Gain Limit
If there are quick changes in reference or feedback in a given application - which means that the error changes
swiftly - the differentiator may soon become too dominant. This is because it reacts to changes in the error. The
quicker the error changes, the stronger the differentiator gain is. The differentiator gain can thus be limited to allow
setting of the reasonable differentiation time for slow changes and a suitably quick gain for quick changes.
Par. PI-06
Speed PID Lowpass Filter
Time
A low-pass filter that dampens oscillations on the feedback signal and improves steady state performance. However,
too large filter time will deteriorate the dynamic performance of the Speed PID control.
Practical settings of par. PI-06 taken from the number of pulses per revolution on from encoder (PPR):
Encoder PPR
Par. PI-06
Speed PID Lowpass Filter
Time
512
10 ms
1024
5 ms
2048
2 ms
4096
1 ms
Below is given an example of how to programme the Speed Control:
In this case the Speed PID Control is used to maintain a constant motor speed regardless of the changing load on the motor.
The required motor speed is set via a potentiometer connected to terminal 53. The speed range is 0 - 1500 RPM corresponding to 0 - 10V over the potentiometer.
Starting and stopping is controlled by a switch connected to terminal 18.
The Speed PID monitors the actual RPM of the motor by using a 24V (HTL) incremental encoder as feedback. The feedback sensor is an encoder (1024 pulses per
revolution) connected to terminals 32 and 33.
AF-650 GP Design Guide
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Содержание AF-650 GP Series
Страница 5: ...AF 650 GP Design Guide 4 1...
Страница 53: ...AF 650 GP Design Guide 52 4...
Страница 97: ...Please note airflow directions 6 1 5 Mechanical Dimensions AF 650 GP Design Guide 96 6...
Страница 98: ...Please note airflow directions AF 650 GP Design Guide 97 6...
Страница 99: ...Please note airflow directions AF 650 GP Design Guide 98 6...
Страница 100: ...Please note airflow directions AF 650 GP Design Guide 99 6...
Страница 173: ...Max cable length 150 m AF 650 GP Design Guide 172 9...
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