Load shedding logic help

Have a look at the "High/Low Thresholds" tab in the CMU setup.

You can configure it to send different trigger (or other) events for when the readings reach different thresholds.

Nick

 

Sorry.. I misunderstood the question.

If you want to drop out (and reinstate) different combinations of loads depending on the total amount you're trying to shed you could do it a number of ways (as always).

I would break it down into several different levels of load shedding... say small, medium, and large (you can expand this number of states later but if you want to trigger them ).

Define 3 scenes with the 3 different combinations of groups you want on and off at each level of load. Assign a common trigger group and a unique action selector to each scene.

Then set up the thresholds in the CMU to send the scene triggers as the thresholds are crossed.

You would also want a scene for "normal" to set when the load drops back below the "low" threshold.

Nick

Edit.. just realised you have 3 phases and there are only 8 thresholds in the CMU... you can still do the above but you would need to use logic to monitor the measurements and trigger the scenes like that.

 

Getting the measurements from the CMU in logic is easy.. just use the GetRealIBSystemIO function.

Here's an example of using a measurement in logic from my own

Code:

{Get outside temperature}
r_temp := GetRealIBSystemIO("Measurement App Real Value", "WIRED", 0, 1);

{Enable the underfloor heating schedule only if it's cold enough}
once (r_temp < 10) then
begin
SetEnableState("UFH Enable", ON);
end;

{and disable it once it's not so cold}
once (r_temp > 15) then
begin
SetEnableState("UFH Enable", OFF);
end;

{Get ensuite slab temperature}
r_temp := GetRealIBSystemIO("Measurement App Real Value", "WIRED", 71, 2);

{turn off heating once slab temp gets to 20 degrees}
once (r_temp > 20) then
begin
SetLightingState("Ensuite Floor Heater", OFF);
end;

In this case "WIRED" is the network, 0 and 71 are the DeviceID of the two measurements and 1 and 2 are the channel numbers on those devices.

You need to add the measurement channel first in the measurement manager (Project->C-Bus Applications->Measurement Manager...) before you can use them but if you're already displaying the power consumption as you mentioned you've probably already done this.

Nick