janitza UMG 509-PRO, Руководство пользователя и технические данные

Страница: 38 / 116

UMG 509-PRO
38
www.janitza.com
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 the connection of the
temperature 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.
Consequently, it is essential to note that dan-
gerous voltages at these inputs can have an
effect on the other respective connections.
7.8.4 Example insulation of the tempera-
ture sensor
A temperature sensor is used for measurement in
the proximity of
non-insulated mains wiring in a 300 V
CAT III network.
The temperature sensor must use reinforced
or double insulation for 300 V CAT III.
PT100
GND
VCC
10
9
8
UMG 509-PRO
Fig. Schematic representation of the connection
example
CAUTION
Risk of injury or damage to the meter/your
system due to short circuit!
Insufficient insulation of the equipment at the ana-
log inputs (temperature measurement and residual
current measurement) with respect to the supply
circuits can lead to voltages at the measurement
input that are dangerous to touch or can damage
your device/system.
Ensure reinforced or double insulation with
respect to the supply circuits.