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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
12-21
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If you cannot take measures as described above, you must install a high-voltage
protection for your system between the 0 <-> 1 transition points with a lightning
conductor. The table below contains the components you can use for high-voltage
protection of your plant.
Table 12-8 High-voltage protection of cables with surge voltage protection components
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3-phase TN-C system 1 x DEHNbloc/3
lightning conductor, phase
L1/L2/L3 to PEN
900 110*
5SD7 031
1 x DEHNbloc/3
lightning conductor, phase
L1/L2/L3 to PE
900 110*
5SD7 031
3-phase TN-S system
1 x DEHNbloc/1
lightning conductor, N to PE
900 111*
5SD7 032
1 x DEHNbloc/3
lightning conductor, phase
L1/L2/L3 to N
900 110*
5SD7 031
3-phase TT system
1 x DEHNgap B/n
N-PE lightning conductor, N
to PE
900 130*
AC TN-S system 2 x DEHNbloc/1
lightning conductor, phase
L1 +N to PE
900 111*
5SD7 032
AC TN-C system 1 x DEHNbloc/1
lightning conductor, phase L
to PEN
900 111*
5SD7 032
1 x DEHNbloc/1
lightning conductor, phase
to N
900 111*
5SD7 032
1
AC TT system
1 x DEHNgap B/n
N-PE lightning conductor, N
to PE
900 130*
2 24 VDC Power Supply 1 x Blitzductor VT Lightning
conductor,
type A D 24 V -
918 402*
3 MPI bus cable, RS485, RS232
(V.24)
1 x Blitzductor CT lightning
conductor, type B
919 506* and
919 510*
4 Inputs/outputs of digital modules
24 V
DEHNrail 24 FML 909 104*
5 24 VDC power supply module 1 x Blitzductor VT
lightning conductor, type AD
24 V -
918 402*
900 111*
5SD7 032
6 Inputs/outputs of digital modules
and 120/230 VAC power supply
2 x DEHNbloc/1 lightning
conductor
900 111*
5SD7 032
7 Inputs/outputs of analog modules
up to 12 V +/-
1 x Blitzductor CT lightning
conductor, type B
919 506* and
919 510*
* You can order these components directly from:
DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str. 1
D-92318 Neumarkt
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