Hello everyone,
I have a question about the ON/OFF Differential controller in the PVT example in TRNSYS. The tank level indicator is from 1 (full) to -1 (lower) and 0 (in between).
In this example, in order to maintain the level in water in the tank, the first value is set to zero; the second value is connected to the level indicator. The upper and lower dead bands are 0.9 and -0.9, respectively.
Can somebody please explain this to me? Since it is against what is explained about dead bands in the software. (copied below)
"The controller is ON if it was previously ON and Th (Input 1) minus T (Input 2) is greater than the lower dead band. Otherwise the controller is OFF.
The controller is ON if it was previously OFF and Th (Input 1) minus Tl (Input 2) is greater than the upper dead band. Otherwise the controller is OFF."
I have another question, why we should connect ON/OFF Differential controller to itself again?
Best Regards
Saeid Bina, Dr. (Eng.)
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Akita University
Graduate
school of International Resource Sciences.
1-1 Tegata gakuen-machi, Akita 010-8502, Japan
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