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Room temperature controller RAM 713 S
theben
Version: Sep-12 (subject to change) Seite 51 von 56
P-control as temperature control
The P-control behaves during heating control as shown in the previous example.
The setpoint temperature (21
o
C) can never quite be reached.
The permanent control deviation increases as the heat loss increases and decreases as the
ambient temperature decreases.
5.5.3 Response of the PI-control
Unlike the pure P-control, the PI-control works dynamically.
With this type of control, the control variable remains unchanged, even at a constant
deviation.
In the first instant, the PI-control sends the same control variable as the P-control, although
the longer the setpoint value is not reached, the more this value increases.
This increases is time-controlled over the so-called integrated time.
With this calculation method, the control variable does not change if the setpoint value and
the actual value are the same.
Our example, therefore, shows equivalent in and outflow.
Notes on temperature control:
Effective control depends on agreement of bandwidth and integrated time with the room to be
heated.
The bandwidth influences the increment of the control variable change:
Large bandwidth = finer increment on control variable change.
The integrated time influences the response time to temperature changes:
Long integrated time = slow response.
Poor agreement can result in either the setpoint value being exceeded (overshoot) or the
control taking too long to reach the setpoint value.
Usually, the best results are achieved with the standard settings or the settings via system
type.
Standard settings:
Control by system type
51


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