Appendix
S7-300 Programmable Controller Hardware and Installation
11-2 A5E00105492-01
Mains voltage
The following table shows you what to watch with respect to the mains voltage.
Table 11-2 Mains voltage
In the case of ... is ...
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 permissible tolerance
(refer to Technical Data of S7-300
modules).
24 VDC Power Supply
The table below shows what you must observe in connection with the 24 VDC
power supply.
Table 11-3 Protection against external electrical interference
In the case of ... Measures to take
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
Protection against external electrical interference
The table below shows how you must protect your system against electrical
interference or faults.
Table 11-4 Protection against external electrical interference
In the case of ... Make sure that ...
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.
Information on EMC and surge protection ...
is found in the following Chapters.
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