Siemens Simatic S7-400

Assembling and Installing Systems
A-27
Automation System S7-400 Hardware and Installation
A5E00850741-01
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 S7-400 for C E compliance.
Table A-5 Surge Protection Components for Lightning Protection Zones 2 <--> 3
Ser.
No.
Cables for ... ... .. equip transition point
2 <--> 3 with:
Order No.
1 3-phase TN-C-System 3 pieces of DEHNguard 275 surge arresters 900 600*
5SD7 030
3-phase TN-S system 4 pieces of DEHNguard 275 surge arresters 900 600*
5SD7 030
3-phase TT system 3 pieces of DEHNguard 275 surge arresters
phase L1/L2/L3 to N
900 600*
5SD7 030
1pieceof DEHNgap C N-PE surge N to PE 900 131*
AC TN-S system 2 pieces of DEHNguard 275 surge arresters 900 600*
5SD7 030
AC TN-C system 1pieceof DEHNguard 275 surge arresters 900 600*
5SD7 030
AC TT system 1pieceof DEHNguard 275 surge arresters
phase L to N
900 600*
5SD7 030
1pieceof DEHNgap C N-PE surge N to PE 900 131*
2 24 VDC Power Supply 1pieceof Blitzductor VT lightning conductor,
type AD 24 V
918 402*
3 Bus cable
• MPI RS 485 • Blitzductor CT surge arrester, type
MD/HF
919 506* and
919 570*
• RS 232 (V.24) 1pieceof • per conductor pair low-voltage
protection FDK 2 12 V
919 995*
4 Inputs of digital modules
• 24 VDC 1pieceof Low-voltage surge arrester,
type FDK 2 60 V on insulated rail
919 993*
2 pieces of Surge arresters
• 120 VAC • DEHNrail 120 FML 901 101*
• 230 VAC • DEHNrail 230 FML 901 100*
5 Outputs of digital modu-
les 24 VDC
1pieceof Low-voltage protection FDK 2 D 5 24 919 991*
6 Outputs of analog modu-
lesupto12V+/--
1pieceof Low-voltage protection,
type FDK 2 12 V on insulated rail con-
nected with M-- of the power supply
for the modules.
919 995*
* You can order these components directly at: DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str. 1
D-92318 Neumarkt