Assembling and Installing Systems

A-29

AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
Components in figure A-7

The table A-6 explains consecutive numbers in the figure A-7:

TableA-6 Example of a Circuit Conforming to Lightning Protection Requirements
(Legend to Figure A-7)
Ser.No.
fromfi -
gureA -7
Components Description
1Lightning arrestor,depending on
the mainssystem, e.g. T N-Ssy-
stem:
1 piece DEHNbloc/3,
order number: 900 110*and
1 piece DEHNbloc/1,
order number: 900 111*
High-voltage protection against direct
lightning strike and surge voltage as of
transition 0 <-->1
2surge arrestors,
2 pieces DEHNguard 275;
order number: 900 600*
High-voltage surge protection at transi-
tion1<-->2
3Surge arrestor,
Blitzductor CT type MD/HF,
order number: 919 506* and
919 570*
Low-voltage surge protection for RS 485
interfaces at transition 1 <-->2
4Digital input modules:
FDK 2 D 60 V,order number:
919 993*
Digital output modules:
FDK 2 D 5 24 V,order number:
919 991*
Analog modules:
MD 12V Blitzductor CT,
order number: 919 506 and
919 541
Low-voltage surge protection, signal mo-
dules I/O at transition 1 <-->2
5Bus cable shielding mounting de-
vice with EMC spring clamp on
the basicunit of Blitzductor CT;
order No.: 919 508*
Discharge of interference current
6Cable for equipotential bonding
16 mm
Standardization of reference potentials
7Blitzductor CT,type B for building
transitions;
order number: 919 506* and
919 510*
High-voltage surge protection for RS 485
interfaces at transition 0 <-->1
* Youcan order these components directly at: DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str.1
D-92318 Neumarkt