Siemens EK 730 Series Betriebsanleitung PDF herunterladen (Seite 22)

Connection

5.1 Lightning protection, power supply and grounding

SCALANCE W770/W730

22 Operating Instructions, 11/2014, C79000-G8976-C325-04

Note

We recommend that you use the maintenance

-free lightning protector LP798-2N.

Exception: When there is also DC power supplied via the antenna cable. In this case, only

the lightning protector LP798

-1N can be used.

WARNING

Danger due to lightning strikes

Installing this lightning protector between an antenna and a SCALANCE W700 is not

adequate protection against a lightning strike. The LP798-1N lightening protector only

works within the framework of a comprehensive lightning protection concept. If you have

questions, ask a qualified specialist company.

Note

The requirements of EN61000

-4-5, surge immunity tests on power supply lines, are met only

when a Blitzductor is used with 24 VDC:

BVT AVD 24

type no. 918 422

Manufacturer: DEHN+SÖHNE GmbH+Co.KG, Hans

Dehn Str. 1, Postfach 1640, D -

92306 Neumarkt, Germany

Safety extra low voltage

WARNING

Danger to life from overvoltage, fire hazard

SCALANCE W700 devices are designed for operation with a directly connectable safety

extra-low voltage or with the power supply adapters available as accessories (available

only for the SCALANCE W786 device). Therefore only safety extra-low voltage (SELV) with

limited power source (LPS) complying with IEC950/EN60950/VDE0805 may be connected

to the power supply terminals.

Take measures to prevent transient voltage surges of more than 40% of the rated voltage.

This is the case if you only operate devices with SELV (safety extra-low voltage).

The power supply unit to supply the SCALANCE W700 must comply with NEC Class 2

(requirements of class 2 for power supply units of the "National Electrical Code, table 11

(b)") or SELV with LPS (Limited Power Source) EN 60950-1. If the power supply is

designed redundantly (two separate power supplies), both power supplies must meet these

requirements.

Exception:

Power supply with PELV (according to VDE 0100-410 or IEC 60364-4-41) is also possible if

the generated rated voltage does not exceed the voltage limits 25 VAC or 60 VDC.

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