Low-Voltage Protection For Lightning Protection Zones 2 <-> 3 - Siemens SIMATIC S7-300 Hardware And Installation Manual

Low-voltage protection elements for 2<-> 3
For the transition points between lightning protection zones 2 <-> 3 we recommend
the surge protection components listed in the table below. This low-voltage
protection must be used in S7-300 for CE compliance.
Table 11-10 Low-voltage protection for lightning protection zones 2 <-> 3
Ser. Cables for ...
No.
1 3-phase TN-C system
3-phase TN-S system
3-phase TT system
AC TN-S system
AC TN-C system
AC TT system
2 24 VDC Power Supply
3 Bus cable
•
MPI, RS485
•
RS232 (V.24)
4 Inputs of digital modules
•
24 VDC
•
120 VAC
•
230 VAC
5 Outputs of digital modules
24 V
6 Outputs of analog modules
up to 12 V +/-
* You can order these components directly from:
DEHN + SÖHNE, GmbH + Co. KG, Elektrotechnische Fabrik
Hans-Dehn-Str. 1, D-92318 Neumarkt
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
... equip transition point
2 <-> 3 with:
3 pieces DEHNguard 275 surge
of arresters
4 pieces DEHNguard 275 surge
of arresters
3 pieces DEHNbloc/275 surge arrester,
of phase L1/L2/L3 to N
1 piece DEHNgap C, N-PE surge
of arrester, N to PE
2 pieces DEHNguard 275 surge
of arresters
1 piece DEHNguard 275 surge
of arresters
1 piece DEHNguard 275
of surge arrester, phase L to N
1 piece DEHNgap C, N-PE surge
of arrester, N to PE
1 piece Blitzductor VT, type AD 24 V -
•
Blitzductor CT surge
arrester, type MD/HF
•
1 piece per conductor pair
of Low-voltage protection
FDK 2 12 V
1 piece Low-voltage protection, type
of FDK 2 60 V, on insulated profile
rail
2 pieces Surge arrester
of
•
DEHNrail 120 FML
•
DEHNrail 230 FML
1 piece Low-voltage protection
of FDK 2 D 5 24
1 piece Low-voltage protection,
of type FDK 2 12 V, on insulated
rail connected with M- of the
power supply for the modules.
Appendix
Order No.
900 600*
5SD7 030
900 600*
5SD7 030
900 600*
5SD7 030
900 131*
900 600*
5SD7 030
900 600*
5SD7 030
900 600*
5SD7 030
900 131*
918 402*
919 506* and
919 570*
919 995*
919 993*
901 101*
901 100*
919 991*
919 995*
11-25