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Parameter evaluation
Load control does not cause variation in boiler temperature or pressure with optimum
PID parameters.
When changing the setting, boiler temperature or pressure should stabilize without
going up and down. Pressure and temperature must not go under or exceed set
values.
A common ratio for Tn / Tv = 4…6.
Examples of typical incorrect settings, and the optimal setting to change the set value:
Xp too low
Xp too high
Tn and Tv too low
Tn and Tv too high
Optimum setting
If load control is not completely stabilized, but fluctuates continuously near the setpoint
value, the following parameters can be used to control this.
Always make sure that the PID parameters are correctly set before
using the following parameters. A noticeable fluctuation of load near the
set value indicates poor setting of PID parameters.
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