Assembling and Installing Systems
A-29
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Components in figure A-7
The table A-6 explains consecutive numbers in the figure A-7:
Table A-6
Example of a Circuit Conforming to Lightning Protection Requirements (Le-
gend to Figure A-7)
Ser. No.
from fi-
gure A-7
Components
Description
1
Lightning arrestor, depending on
the mains system, e.g. TN-S sy-
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
2
surge arrestors,
2 pieces DEHNguard 275;
order number: 900 600*
High-voltage surge protection at transi-
tion 1 <–> 2
3
Surge 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
4
Digital 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 12 V Blitzductor CT,
order number: 919 506 and
919 541
Low-voltage surge protection, signal mo-
dules I/O at transition 1 <–> 2
5
Bus cable shielding mounting de-
vice with EMC spring clamp on
the basic unit of Blitzductor CT;
order No.: 919 508*
Discharge of interference current
6
Cable for equipotential bonding
16 mm
Standardization of reference potentials
7
Blitzductor 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
*
You can order these components directly at:
DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str. 1
D-92318 Neumarkt
