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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
12-18 A5E00105492-03
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we show you solutions for the protection of your S7-300 against damage as a
result of surge voltage.
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Failures are very often the result of surge voltage caused by:
• Atmospheric discharge or
• Electrostatic discharge.
We will begin by showing you what the theory of surge protection is based on: the
lightning protection zones concept.
At the end of this section, you will find rules for the transition points between
individual lightning protection zones.
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This section can only provide information on the protection of a PLC against surge
voltage.
However, complete surge protection is guaranteed only if the whole surrounding
building is designed to provide protection against overvoltage. This applies
especially to constructional measures for the building at the planning stage.
If you wish to obtain detailed information on surge protection, we therefore
recommend you contact your Siemens partner or a company specialized in
lightning protection.
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The principle of the lightning protection zone concept states that the volume to be
protected against overvoltage, for example, a manufacturing hall, is subdivided into
lightning protection zones in accordance with EMC directives (see Figure ).
The specific lightning protection zones are formed by the following measures:
Lightning protection of the building exterior (field side) Lightning protection zone 0
Shielding
• Buildings
• Rooms and/or
• Devices
Lightning protection zone 1
Lightning protection zone 2
Lightning protection zone 3
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