Tuning loops
is not quick and easy as it requires precision and patience. As we all are
quite familiar with the PID tuning software its steps, controller performance,
and the results. But the most important step comes when we have to test the PID
software for accurate performance.
Testing and
proving, which is the best PID tuning software are seen to be
the most problematic subject for practitioners. Determining what is the best
suitable testing option in different situations is still a great matter of concern.
Here in this content, we will discuss the foremost tests on how to tune the PID
loops effectively and successfully.
4 Effective tests for tuning the PID
software
1.
First test
The first test
is the “step test” that may at first seem straightforward but will, later on,
show some remarkable challenges. It involves stepping the controller output
from one valve that is constant to the other and will result in the
photovoltaic (PV) moving from one form to another. Make sure that the size of the
change is large so that the response of the valve can be distinguished from any
other noise in the process.
Note that if
the PID does not contain tuning and modeling software then applying the step
test is the only left option. A constant state of the software is required at
both the start and end of the test; if any hurdles occur during the testing
then the results may be considered invalid. Also, note that it is a lengthy
test.
2.
Second test
The second
test is the “pulse test”. It can be seen involved two-step test conducted in the
opposite direction, succession, and without the steady-state requirement. It
starts by changing the controller output and moving the photo-voltaic in a
single direction until an apparent response is found. Once the response of the
photo voltaic is detected then the controller output is stepped in either direction.
Ultimately,
the controller output returns to its original state where it was steady. This
step is however more systematic than the first step. Keep in mind to calculate the
model parameters accurately the pulse needs the use of PID software.
3.
Third test
The third test
is a pulse test which is the most complete test than the above two tests. It
involves a second change, in the photo-voltaic valve- the difference-maker. It
doubles the size of the two smaller accommodations and spans the photostatic
initial steady valve.
This
collectively, provides a complete understanding of the software’s behavior,
revealing a wider range of process variable regions.
4.
Fourth test
The (PRBS)
Pseudo-Random Binary Sequence test is best suited for delicate process-those
that cannot handle important changes to the photovoltaic valve. It involves the
series of control outputs that are alternating in course, uniform amplitude and
haphazard duration. Each control output takes the PV beyond the level of sound
in the tuning process. The PRBS test produces data that is highly withstanding
and functional. It also offers an effective means that can be useful to improve
the PID tuning loop performance.
Hopefully,
we covered up all the steps for you effectively so that now you can know which
software to be used and which software to be discarded. Remember these steps
are highly used in industries to test the working of PID software so be relaxed
to apply them. If you are interested in purchasing the best PID tuning software
then feel free to contact the PI Control Solutions anytime.
