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A good start value for par. PI-06
Speed PID Lowpass Filter Time
is 5 ms (lower encoder resolution calls for a higher filter value). Typically a Max Torque Ripple of 3
% is acceptable. For incremental encoders the Encoder Resolution is found in either par. E-80
Term 32/33 Pulses Per Revolution
(24V HTL on standard drive) or
par. EC-11
Resolution (PPR)
(5V TTL on OPCENC Encoder Option Module).
Generally the practical maximum limit of par. PI-02
Speed PID Proportional Gain
is determined by the encoder resolution and the feedback filter time but other
factors in the application might limit the par. PI-02
Speed PID Proportional Gain
to a lower value.
To minimize the overshoot, par. PI-03
Speed PID Integral Time
could be set to approx. 2.5 s (varies with the application).
Par. PI-04
Speed PID Differentiation Time
should be set to 0 until everything else is tuned. If necessary finish the tuning by experimenting with small increments of
this setting.
3.4.3 Process PID Control
The Process PID Control can be used to control application parameters that can be measured by a sensor (i.e. pressure, temperature, flow) and be affected by
the connected motor through a pump, fan or otherwise.
The table shows the control configurations where the Process Control is possible. When a Flux Vector motor control principle is used, take care also to tune the
Speed Control PID parameters. Refer to the section about the Control Structure to see where the Speed Control is active.
Par. H-40
Configuration Mode
Par. H-41
Motor Control Principle
U/f
Advanced Vector Control
Flux Sensorless
Flux w/ enc. feedb
[3] Process
N.A.
Process
Process & Speed
Process & Speed
Note: The Process Control PID will work under the default parameter setting, but tuning the parameters is highly recommended to optimise the application control
performance. The two Flux motor control principles are specially dependant on proper Speed Control PID tuning (prior to tuning the Process Control PID) to yield
their full potential.
Illustration 3.1: Process PID Control diagram
AF-650 GP Design Guide
30
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Summary of Contents for AF-650 GP Series
Page 5: ...AF 650 GP Design Guide 4 1...
Page 53: ...AF 650 GP Design Guide 52 4...
Page 97: ...Please note airflow directions 6 1 5 Mechanical Dimensions AF 650 GP Design Guide 96 6...
Page 98: ...Please note airflow directions AF 650 GP Design Guide 97 6...
Page 99: ...Please note airflow directions AF 650 GP Design Guide 98 6...
Page 100: ...Please note airflow directions AF 650 GP Design Guide 99 6...
Page 173: ...Max cable length 150 m AF 650 GP Design Guide 172 9...
Page 179: ...AF 650 GP Design Guide 178 9...