janitza UMG 512-Pro, Руководство пользователя и технические данные

Страница: 38 / 120

UMG 512-PRO www.janitza.com
38
7.8.3 Temperature measurement
The device has a temperature measurement input
designed for a maximum total load of 4 kOhms.
This refers to the sensor and the wire.
The temperature is measured via terminals 8 to
10.
PT100
Fig. Connection example for temperature measurement via a
PT100
ATTENTION
Transmission error and material damage due to
electrical malfunction.
With a cable length of more than 30 m, there is an
increased probability of transmission errors and
damage to the device due to atmospheric dis-
charge!
Use a shielded cable for connecting the tem-
perature sensor.
WARNING
Risk of injury due to electrical voltage!
The Profibus, RS-485, temperature measurement
input and residual current measurement input are
not galvanically isolated from each other.
It is therefore essential to note that dangerous
voltages at these inputs can have an effect on
the respective other connections.
7.8.4 Example isolation of the temperature
sensor
A temperature sensor is to be used for
measurement in the proximity of non-insulated
mains wiring in a 300 V CAT III network.
The temperature sensor must have reinforced
or double insulation for 300 V CAT III.
PT100
GND
VCC
10
9
8
UMG 512-PRO
Fig. Schematic representation of the connection example
CAUTION
Risk of injury or damage to the meter/your
system due to short circuit!
Inadequate insulation of the operating equipment
at the analog inputs (temperature measurement
and residual current measurement) with respect to
the supply circuits can cause voltages at the mea-
surement input which represent a hazard when
touched or damage to your device or system.
Ensure reinforced or double insulation with
respect to the supply circuits.