Blocking Signal

Heat generator stages have minimum on-, off times and blocking times for the next stages.


Fig. 11.   Blocking times for a staged heat generator

1; 0 = no blocking;

2 = blocking increasing number of stages (boiler stages are allowed to switch on);

3 = blocking decreasing number of stages (boiler stages are allowed to switch off);
4 = blocking increasing and decreasing number of stages (boiler stages are not allowed to switch on / off).

Fig. 12.   Blocking times for a modulating heat generator

The strategy provides an output “DispBlockSignal” where this signal can be viewed and trended.

To build the blocking signal the strategy uses an internal communication signal.