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T-Control
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Betriebsanleitung_commotherm_5_15_SW_WW_Touch_Englisch_V1.2
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External requirement at digital input:
At a digital request the external set temperature gets transmitted as value to the heat supplier.
External requirement at analogue input
At an analogue request a calculated (= linearly interpolated) temperature gets transmitted to the heat
supplier (see figure 8.18). The graph in figure 8.18 gets regulated by the parameters „analogue must
temperature 4 mA“ and „analogue must temperature 20 mA“.
The line in the diagram arises from the following setting parameters (see figure 8.17):
figure 8.17: Einstellungen – externe Anforderung
For example at an analogue request with an current signal of 12 mA, a temperature of 35 °C is registered at
the heat supplier, provided that the digital requirement (= external must temperature) is not higher.
At the input of the external requirement module a current signal between 4 and 20 mA should be given,
because a current signal is compared to a voltage signal insensitive to electromagnetic disturbances and
voltage losses at the cables. With an internal resistor (500 Ohm) the current signal is converted into a
voltage signal.
External requirement
module
500 Ω
Stromsignal in mA
Current signal in mA
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Input signal =
current signal
figure 8.18: Analogue set temperature as a function of the applied current signal of the external requirement
