Hardware installation
3.3 External power supply
CP 5711
Operating Instructions, 02/2018, C79000-G8976-C283-05
19
3.3
External power supply
Safety notices
WARNING
Safety extra-low voltage - SELV
The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a
Limited Power Source (LPS).
This means that only SELV / LPS complying with IEC 60950-1 / EN 60950-1 / VDE 0805-1
may be connected to the power supply terminals. The power supply unit for the equipment
power supply must comply with NEC Class 2, as described by the National Electrical Code
(r) (ANSI / NFPA 70).
Devices operated with a redundant power supply
If the device is connected to a redundant power supply (two separate power supplies), both
must meet these requirements.
Note
Overvoltage protection
If the communications processor is supplied over long 24 V power supply lines or networks,
measures are necessary to prevent coupling of strong electromagnetic pulses on the supply
lines. Such coupling can result, for example, due to lightning or switching of large inductive
loads.
One of the tests used to attest the immunity of the communications processor to
electromagnetic interference is the "surge immunity test" according to EN 61000-4-5. This
test requires overvoltage protection for the power supply line. A suitable device is, for
example, the Dehn Blitzductor BVT AD 24V type no. 918 402 or a comparable protective
element.
Manufacturer;
DEHN+SÖHNE GmbH+Co.KG, Hans Dehn Str. 1, Postfach 1640, D-92306 Neumarkt,
Germany
Conditions for the external power supply
The CP 5711 can also be operated with an external power supply with 24 VDC. You require
this external power in the following situations:
●
The CP 5711 is operated on an external hub without its own power supply.
●
The USB interface on the PC is a low-power interface that supplies only 100 mA.
●
The end termination must be activated on the PROFIBUS connector if the CP 5711 is
located at the end of the cable. If you want this termination to be active even when no
USB cable is connected, an external power supply is necessary.
Summary of Contents for CP 5711
Page 6: ...Preface CP 5711 6 Operating Instructions 02 2018 C79000 G8976 C283 05 ...
Page 8: ...Table of contents CP 5711 8 Operating Instructions 02 2018 C79000 G8976 C283 05 ...
Page 24: ...Configuration CP 5711 24 Operating Instructions 02 2018 C79000 G8976 C283 05 ...
Page 30: ...Approvals CP 5711 30 Operating Instructions 02 2018 C79000 G8976 C283 05 ...
