Siemens S7-400 installation manual Low-Voltage Protection Elements for 2

Assembling and Installing Systems

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 CE compliance.

Table A-5 Surge Protection Components for Lightning Protection Zones 2 <--> 3

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

Hans-Dehn-Str. 1

D-92318 Neumarkt

Automation System S7-400	Hardware and Installation	A-27
A5E00850741-01