Connection Examples - Siemens SENTRON 7KT1681 Manual

Connecting

5.1 Connection examples

Note
RS 485 termination recommended
In order to avoid reflection on the bus cable, we recommend fitting a 120 Ω terminating
resistor at the beginning and end of the bus cable.
To establish Modbus RTU communication, the communication parameters must be known.
These include baud rate and format. Furthermore, you must have entered the slave address
in the device.
Qualified personnel
Some of the following tasks are carried out when hazardous voltage is present. For this
reason, they must only be carried out by qualified personnel who are familiar with the safety
regulations and precautions and who follow the safety regulations and precautions.
● Wear the prescribed protective clothing.
● Observe the general equipment regulations and safety regulations for working with high-
voltage installations (e.g. DIN VDE, NFPA 70E), as well as national and international
regulations.
● Ensure that the limits given in the technical data are not exceeded, not even during
commissioning or testing.
● Short circuit the secondary connections of intermediate current transformers at the
transformers before interrupting the current lines to the device.
● Test the polarity and the phase assignment of the instrument transformers.
● Before connecting the device, ensure that the system voltage matches the voltage
specified on the type plate.
● Before commissioning, ensure that all connections have been made correctly.
● Before power is applied to the device for the first time, have it placed in the operating
room for a period of at least two hours. This allows it to reach temperature balance and
avoids humidity and condensation.
5.1 Connection examples
Note
Recommended fuses
Auxiliary energy and measuring input voltage: F1A (fast-acting)
Note
S2 terminals are internally interconnected.
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7KT multimeter
Manual, 08/2018, 2514284149-01