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Room temperature controller RAM 713 S
theben
Version: Sep-12 (subject to change) Seite 49 von 56
5.5 Temperature control
5.5.1 Introduction
If the RAM 713 S is not configured as a switching controller, it can alternatively be
configured as a P or as a PI controller, whereby PI control is preferable.
With the proportional control (P control), the control variable is statically adjusted to the
control deviation.
The proportional integral control (PI control) is far more flexible, i.e. controls more quickly
and more accurately.
To explain the function of both temperature controls, the following example compares the
room to be heated with a vessel.
The filling level of the vessel denotes the room temperature.
The water supply denotes the radiator output.
The heat loss from the room is illustrated by a curve.
In our example, the maximum supply volume is 4 litres per minute and also denotes the
maximum radiator output.
This maximum output is achieved with a control variable of 100%.
Accordingly, at a control variable of 50%, only half the water volume, i.e. 2 litres per minute,
would flow into our vessel.
The bandwith is 4l.
This means that the control controls at 100% provided the actual value is smaller than or
equal to (211 – 41) = 171.
Function:
Desired filling quantity:
21 litres (= setpoint value)
From when should the supply flow gradually be reduced in order to avoid an
overflow? :
4l below the desired filling volume, i.e. at 21l – 41 = 171 (=bandwidth)
Original filling volume
15l (=actual value)
The loss amounts to 1l/minute
49


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