890564_c•en•01.08.2013
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18
Wisotronic 2/3/4-channel
Installation instructions
4.1 Weather station
multisense
The weather station multisense records precipitation events such as rain or
snow, wind speed, ambient brightness, dawn/dusk and outside temperature.
The weather station only needs to be connected as a network station; the
24 V DC voltage supply is provided via a 4-wire bus cable.
Four photo sensors arranged at right angles record the ambient brightness
whereby sensor 1 also records dawn/dusk values in a second measuring
area.
Sensor surface to detect precipitation
A switch signal is triggered by the sensor in the event of precipitation in the
form of drizzle, rain or snow. The sensor surface can be heated. If the out-
side temperature falls below +15 °C or precipitation is registered, the heater
is activated and thereby prevents triggering due to high relative humidity
alone or ice formation at negative temperatures. After the sensor surface has
detected precipitation, it quickly dries again because of the heating. The incli-
nation of the sensor surface creates the required angle to allow the water to
drain off the sensor surface.
The weather station must be mounted in an upright position with a maximum
inclination of ±2°. The photodiodes must be at right angles to the building fa-
cades being shaded. Please refer also to the information in the "Sun control"
chapter in the operating instructions.
The weather station should be mounted easily accessible on the highest
point of the roof structure or the conservatory. To prevent interference with
the wind evaluation, do not mount the device away from the wind.
For the system to function properly, precipitation must be able to hit the sen-
sor surface without interference.
The supply line must be routed so that water cannot enter into the housing.
Use weather-resistant (suitable for outdoor installation) cables such as
4x AWG 26 UL bl.
The "dawn/dusk" photodiode controls the dawn/dusk control. The weather
station should therefore be positioned so that the photodiode cannot be in-
fluenced at night by street or garden lighting or other external light sources
(e.g. flashlights).
Mount the weather station using the supplied fixing bracket or an optionally
available pole. This requires an additional fixing adapter (special accessory).
The photodiodes in the sensor must be exposed to the same brightness con-
ditions as the sun shading products being controlled. Therefore, position the
photodiodes according to the building facades being shaded (see Fig. 5).
Trees, bushes or parts of the building can shade the sensor during the
course of the day (see Fig. 6). In this case, the sensor cannot deliver exact
values and the results will be incorrect. Therefore, select the installation loca-
tion carefully.
NOTE
The total line length from the weather station to the Wisotronic must not ex-
ceed 200 m if a twisted pair line is used and routed in an interference-proof
manner. Additional information can be found in the weather station operating
and installation instructions.
Sensor
