Appendix
A.3 Lightning and surge voltage protection
S7-300, CPU 31xC and CPU 31x: Installation
A-24
Operating Instructions, Edition 08/2004, A5E00105492-05
Table A-9
Surge-protection components for lightning protection zones 1 <-> 2
Consec.
no.
Cables for ...
... equip transition point
1 <-> 2 with:
Order number
3-phase TN-C system
3 x
DEHNguard 275 surge arresters
900 600*
5SD7 030
3-phase TN-S system
4 x
DEHNguard 275 surge arresters
900 600*
5SD7 030
3 x
DEHNbloc/275 surge arrester, phase
L1/L2/L3 to N
900 600*
5SD7 030
3-phase TT system
1 x
DEHNgap C, N-PE surge arrester, N
to PE
900 131*
AC TN-S system
2 x
DEHNguard 275 surge arresters
900 600*
5SD7 030
AC TN-C system
1 x
DEHNguard 275 surge arresters
900 600*
5SD7 030
1 x
Surge arrester DEHNguard 275
phase L to N
900 600*
5SD7 030
1
AC TT system
1 x
N-PE surge arrester DEHNgap C
N to PE
900 131*
2
24 VDC power supply
1 x
Blitzductor VT, type AD 24 V
918 402*
Bus cable
•
MPI, RS485
•
Blitzductor CT surge arrester, type
MD/HF
919 506* and
919,570*
3
•
RS232 (V.24)
1 x
•
per cable pair
Blitzductor CT surge arrester,
type ME 15 V
919 506* and
919 522*
4
Inputs of digital modules DC 24 V 1 x
Low-voltage surge arrester
type FDK 2 60 V
919 993*
5
Outputs of digital modules 24 V
1 x
Low-voltage surge arrester
919 991*
Inputs/outputs of digital modules
2 x
Surge arrester
•
120 VAC
•
DEHNguard 150
900 603*
6
•
230 VAC
•
DEHNguard 275
900 600*
7
Inputs of analog modules up to
12 V +/-
1 x
Low-voltage surge arrester
Blitzductor CT, type MD 12 V
919 506* and
919 541*
* Please order these components directly from:
DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str.
D-92318 Neumarkt
