Installation Guide - Siemens SIMATIC NET Operating Instructions Manual

Mounting

5.1 Installation guide

5.1 Installation guide
Electromagnetic compatibility
Electromagnetic compatibility (EMC) includes all questions of electrical, magnetic and
electromagnetic immunity and emission. To avoid interference affecting electrical systems,
these effects must be reduced to a minimum. The essential limiting measures include the
configuration, correct connection of bus cables and the suppression of switching
inductances; refer to the notes in the sections "Installation" and "Connecting optical cables".
Suppressing switching inductances
Connecting switching inductances to suppressors
Some switching inductances, e.g. in relays and fans, create interference voltages that are a
multiple of the connected operating voltage. These interference voltages can influence
electronic devices. Limit the interference voltages cause by inductors at the emission source
by connecting suppression circuits (diode or RC circuit).
Only use suppressors that are intended for use with your relay or fan.
Suppressing cabinet lighting
Use filament bulbs for the cabinet lighting, for example LINESTRA lamps.
Avoid the use of fluorescent lamps since they cause interference. If you cannot avoid using
fluorescent lamps, the measures described in the figure below will be necessary.
①
②
③
④
⑤
Figure 5-1
32
Screen grip over lamp
Shielded cable
Switch encapsulated in metal
Network filter or shielded network cable
Control cabinet
Measures for interference suppression of fluorescent lamps in a cabinet
Operating Instructions, 01/2020, C79000-G8976-C270-06
Optical link module