Table of Contents
Advertisement
2. Switch back to the flow / pressure control mode: Now check that the problem persists in the flow / pressure
control mode.
If the problem still occurs, then continue to next step.
▪
If the problem is solved then you may stop
▪
3. The advanced window has a tab for setting PID gains: The advanced window is located under "tools" in the
menu bar.
4. Tune the PID gains: For the specific flow / pressure control find the corresponding PID gains. The ultimate
goal is to get the optimal steady state operation, and then to get an acceptable disruption response.
a. Set all the gains to zero.
b. Adjust the integral gain up until the steady state response starts to vary noticeably. Take note of this
value; generally this value will be the upper limit for the integral gain.
c. Reduce the Integral gain back down to where the steady state response is reasonable. Take note of
this value; generally this is a good integral gain.
d. Turn the system off and back on. Check for the step response, if the step response is reasonable,
then you can stop here.
e. Increase the proportional gain till an acceptable step response is received. If the system goes unstable,
then the proportional gain is too high.
f.
Verify that with the proportional gain added that the steady state response is still acceptable. If
acceptable then you can stop here.
g. Fine tune the proportional and integral gains by making small adjustments to the both until the desired
response is achieved. Note: based upon the experimentation preformed at White Knight the derivative
gain often has unexpected results, and is not needed for this system. However, the user may
experiment with the derivative gain as part of the fine tuning process.
h. When the process is complete then go to the main screen and save the changes to the system.
25
Manual version 1.0.2
Advertisement
Table of Contents
