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VARIA 826 S KNX Multi-functional display with room thermostat
6.7.2 Response of the P-control
Max. 4l/Min.
Bandwidth
Set point value
Actual value
17l
21l
15l
Losses
1l/Min
A filling volume of 15l gives rise to a control deviation of 211 – 151 = 61
As our actual value lies outside the bandwidth, the control will operate the flow rate at 100%
i.e. at 4l / minute.
The supply quantity (control variable) is calculated from the control deviation
(setpoint value – actual value) and the bandwidth.
Control variable = (control deviation / bandwidth) x 100
The table below shows the response and therefore also the limits of the P-control.
Table 92
Filling level
Actuating value
Feed
Loss
Increase in filling
level
15l
100%
4 l/min
1 l/min
3 l/min
19l
50%
2 l/min
1 l/min
20l
25%
1 l/min
0 l/min
The last line indicates that the filling level cannot increase any further, because the inflow
only allows the same amount of water to flow in as flows out through loss.
The result is a permanent control deviation of 11 and the setpoint value can never be reached.
If the loss was 1l higher, the permanent control deviation would increase by the same amount
and the filling level would never exceed the 19l mark.
In a room this would mean that the control deviation increases with a decreasing outside
temperature.
Updated: Sep-14 (Subject to change) Page 150 of 182
150


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