REINHARDT
System- und Messelectronic GmbH
Bergstr. 33 86911 Diessen-Obermühlhausen Postfach 12 41 D-86908 Diessen Tel. 08196 - 934100
MWS_55_e.indb Page 11
geändert am 04.12.2020 von DO
Manual MWS 55 / MWS 88 / MWS 10 and Sensors 55
Note on Security
Please note that you must in any case use the power supplies which we have provided with your
MWS 55 weather station or which are technically identical. Nominal value must be between 4 V
and 28 V DC voltage; it must be possible to apply at least 100 mA (with optional heating element
another 18 or 24VDC 1 A). Please note also that all the power supplies we provide are only made
for use in dry rooms.
The 7 pole plug is connected to the Power / data socket of the weather station.
There are other sockets for additional sensors, for the power supply of a heating device and for
an optional GPS-receiver. Power supply of the additional sensors can be provided by the weather
station or by their own power supply. The output voltage of the additional sensors must not exceed
+4.095 V, sensors with pulse output must be TTL-compatible.
pin assignments of MWS 55 connectors
.
IMPORTANT !
When removing any additional cables from the weather station, please don't forget to protect the
socket with the cap and don't leave the socket open. Otherwise the contacts of the socket will start
corroding and be damaged within a short period of time!
Also don't forget to protect the plug of the cable from moisture by covering it when removing the
weather station for calibration i.e. In this case also remove the wall adaptor of the power supply to
ensure that no voltage is applied to the contacts of the weather station's plug when it is not used!
Otherwise the plug will start corroding due to moisture and the cable has to be replaced within a
short period of time.
2.1.1 Overvoltage protection
The MWS 55 contains an integrated overvoltage protection (Suppressordiods) at it's supply- and
data wires.
The power linie is protected by a SMCJ26CA-diode. This diode breaks through at voltages above
31VDC and is able to carry up to 1500W for a few milli seconds.
CAUTION: If you connect voltages above 30VDC permanently to the power jack, this
diode will be destroyed within a few seconds!
The data lines are protected by SMBJ15CA-diodes able to carry transients up to 600W.
Also the housing made of high quality steel is connected to system ground.
This protection is suitable for protecting the station from damage due to overvoltage at close
lightning strikes.
For protection of the connected peripherals (computer, camera, i.e.) the customer has to take
further precautions (line protection, opto couplers, i.e.).
But please note that this protection is ineffective in case of direct lightning strike
due to extremely high energy of lightning!
Currents of up to 200.000A can cause voltages up to 20.000V on the housing which
leads to flashovers onto the internal electronic components and its destruction.