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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
12-2 A5E00105492-03
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The following table shows you what to watch with respect to the mains voltage.
Table 12-2 Mains voltage
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For stationary systems or systems without
all-pole mains disconnect switch
Installation of a mains disconnect switch or
a fuse in the building installation system.
For load power supplies, power supply
modules
The set rated voltage range must
correspond to the local power supply
voltage.
For all circuits of the S7-300 Rated mains voltage fluctuation/deviation
must lie within the permitted tolerance (refer
to Technical Data of S7-300 modules).
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The table below shows what you must observe in connection with the 24 VDC
power supply.
Table 12-3 Protection against external electrical interference
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Buildings External lightning
protection
24 VDC power supply cables,
signal cables
Internal lightning
protection
Install lightning protection
(e.g. lightning conductors).
24 VDC Power Supply Safe (electrical) extra-low voltage isolation
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The table below shows how you must protect your system against electrical
interference or faults.
Table 12-4 Protection against external electrical interference
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All plants or system with an S7-300
installation
the plant or system is connected to a
protective conductor for the suppression of
electromagnetic interference.
Supply/signal/bus cables The conductor routing and installation is
correct.
Signal and bus cables a cable/conductor break does not result in
undefined plant or system states.
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can be found in the following Chapters.
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