Connection; Guidelines For Installation Free Of Electrical Interference - Siemens SIMATIC MV500 Operating Instructions Manual

Connection

6.1

Guidelines for installation free of electrical interference

To prevent interference, you will need to provide shielding for your system. Low-frequency
(LF) and high-frequency (HF) interference signals can result in an incorrect response if the
system is badly grounded or not shielded.
Interfering signals can be caused by:
• Switching relays or contactors (large, rapid changes in current or voltage and HF
interfering signals).
• Different ground potentials between two parts of the system (LF interfering signals).
Use/installation of interference-proof cables
• Only use the recommended cable to connect the optical reader.
• Use only shielded cables to power the optical readers.
• Note that the maximum permitted cable length for the power supply is 30 m.
• Note that a maximum cable length of 30 m is permitted for the network cable (Ethernet).
• Do not lay signal lines and heavy current lines together. Use a separate cable duct at least
50 cm from the heavy current lines.
• The power IO cable must withstand an ambient temperature of at least 80 °C during
operation.
• Screw in all cable connectors correctly.
Note
Observance of installation guidelines
Observe the information on installation guidelines in the installation manual of the
automation system (https://support.industry.siemens.com/cs/ww/en/ps/13616/man) being
used (S7-300/-400/-1200/-1500).
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
NOTICE
Grounding the device
Make sure that the device is grounded through one of the screw points in the housing.
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