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Connecting up, installation, commissioning
3.7 Connecting up the RTU
RTU303xC
74
Operating Instructions, 06/2019, C79000-G8976-C382-06
Cables at risk
The RTU is at risk via the following cables:
●
The supply cables of the optional external power supply of the RTU.
●
All signal cables and cables to the power supply of sensors, switches and other devices
connected to the RTU.
●
The antenna cable. If the antenna is installed outside the protective housing of the RTU.
Protection with overvoltage protection modules
The overvoltage protection modules listed in the appendix or technically equivalent modules,
provide additional protection against overvoltage, refer to the section Overvoltage protection
3.7
Connecting up the RTU
Description of the connectors and technical specifications
For a description connectors and connectable devices, refer to the section Interfaces and
connectors (Page 51).
You will find the terminal sizes, maximum torque and technical details of the connectors in
the section Technical data (Page 335).
Notes on wiring
Note
Wire only with power off
1.
First wire all the connectors of the RTU.
2.
Turn the power supply on only after the RTU has been completely wired and connected.
NOTICE
Different power supplies for digital outputs and device
If the power supply of the digital outputs is different from that of the device, the following
wiring rules must be observed:
•
Separate all power supplies electrically from each other.
•
If a common reference potential is required for the power supplies, only connect the
potentials "0 V" or the potentials "N" with each other.
Connecting the mobile wireless antenna (XR1A1)
If you use communication via mobile wireless, connect the antenna to the SMA socket of the
RTU.