Important
I hope I have your attention.
Background
There has been much talk about PID setting, B. This is a value over which the PID acts as a PID instead of an ON/OFF control. So you might set the B value to 8C if you want the PID to act as a PID when the measured temperature reaches a value within 8C of the set point. This allows full on/off responses at values so far away as to prevent the system being slow to respond if it didn’t get a full response. It would also prevent a full response when so close to the set point that it would cause an overshoot.
Current situation
Although I was assured as were ACS, that the settings were in degrees C, and it was in a document from Gicar who did the programming. I have not been satisfied, also Paolo has not been satisfied. Gicar have investigated and responded that the value has been programmed in error and is in fact decimal 10. In other words 0.1C increments.
Translated this means B = 5 is actually 0.5C and B = 50 is 5C
Recommendation
B can have a value of 1 to 999. I recommend B is set to 50 as a minimum, I even think 80 or 90 (8 or 9C) might be a good value. This will improve PID action and reduce or eliminate overshoots. My experience has been (on other machines) that around 8C from the set point systems react in the best way.
For the Steam Boiler….do not implement a value of B
