7. Check the control response of the system.
a. If the response is unstable, then repeat steps 5 to 7 until the response is stable.
b. If the response is stable, then go to step 8.
8. Check if the response settling time and overshoot are satisfactory.
a. If the response settling time and overshoot are satisfactory, then the PID parameter is configured.
b. If the response is unsatisfactory, then go to step 9.
9. Depending on the result of step 8, take the one of the following actions:
a. If the response is stable, then add half of the previous value added or subtracted to the PID value.
b. If the response is unstable, then subtract half of the previous value added or subtracted from the PID value.
10. Create a change in the system.
11. Check the control response of the system.
a. If the response is unstable, or if the response is unsatisfactory, then repeat steps 9 to 11.
b. If the response is stable and satisfactory, then the PID parameter si configured.
Tuning a Kp parameter for an analogue output example
The Kp value was set to the default value of 2.5 when the procedure started. The system will be stable around a Kp
value of 56.
Double the added value until the system is unstable:
2.5 + 2.5 = 5 (stable)
5 + 5 = 10 (stable)
10 + 10 = 20 (stable)
20 + 20 = 40 (stable)
40 + 40 = 80, PICUS adjusts the value to the maximum of 60 (unstable)
Adjust the value until the response is stable and as desired:
60 - 10 = 50 (stable)
10 is half of the 20 that was added in the previous step to reach 60. The result is not responding fast enough.
50 + 5 = 55 (stable)
This response is stable and fast enough for our needs. The parameter is configured.
Tuning a Ti parameter for an analogue output example
The Tp value was set to a high value of 30 when the procedure started. The system will be stable and respond fast
enough and stable around a Ti value of 5.
Double the subtracted value until the system is unstable:
30 - 10 = 20 (stable)
20 - 20 = 0 (stable)
But a zero value turns off the Ti contribution.
Adjust the value until the response is stable and as desired:
0 + 5 = 5 (stable)
This response is stable and fast enough for our needs. The parameter is configured.
Tuning the PID control
Try to use loads that are representative of normal daily operation when you tune the PID control. As a minimum, the loads
should be 40 % of the nominal genset load.
PPU 300 Commissioning guidelines 4189341106 UK
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