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Room temperature controller | Room temperature measurement
Sensor 1: 21.5 °C
Sensor 2: 22.3 °C
Determination of measured value: 30% to 70%
-> T
Result 1
-> T
Result 2
-> T
Result
The controller can request both current temperature values cyclically. For this
purpose, the parameter "Polling time of the temperature values" must be set to
a value > "0". The request interval can be configured within the limits of
1 minute to 255 minutes.
After a device reset, the controller will first wait for valid temperature telegrams
to both objects until control starts and a command value, if applicable, is out-
put.
Calibrating the measured values
In some cases during room temperature measurement, it may be necessary to adjust
the external KNX temperature values. Adjustment becomes necessary, for example,
if the temperature measured by the sensors stays permanently below or above the
actual temperature in the vicinity of the sensor. To determine the temperature devi-
ation, the actual room temperature should be detected with a reference measure-
ment using a calibrated temperature measuring device.
Using the parameters "Adjust temperature input 1 by" and "Adjust temperature input
2 by", it is possible to configure the positive (temperature increase, factors: 1 ... 127)
or negative (temperature decrease, factors -128... -1) temperature calibration in
levels of 0.1 K. Thus, the calibration is made only once statically and is the same for
all operating modes of the controller.
The measured value has to be increased, if the value measured by the sensor
lies below the actual room temperature. The measured value has to be de-
creased, if the value measured by the sensor lies above the actual room tem-
perature.
During room temperature control, the device always uses the adjusted temper-
ature value to calculate the command values. The adjusted temperature value
is transmitted to the bus via the "Room temperature - Actual value - Status"
object. When determining the measured value using both external sensors,
the calibrated values are also used to calculate the actual value.
Temperature adjustment only affects the room temperature measurement.
Transmission of the actual temperature
The determined actual temperature can be actively transmitted to the bus via the
2-byte object "Room temperature - Actual value - Status". Parameter "On change by
(0 = inactive)" specifies the temperature value by which the actual value has to
change in order to have the actual temperature value automatically transmitted via
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
= T
= 21.5 °C · 0.3 = 6.45 °C,
1
= T
= 22,3 °C · 0,7 = 15,61 °C
2
= T
+ T
= 22,06 °C
Result 1
Result 2
Page 183 of 257
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