Friedrich Luetze GmbH 77920X0401 사용자 설명서
LCOS Unmanaged Switch
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Commissioning - Hardware
41
T R A N S P O R T A T I O N
10
Commissioning - Hardware
10.1
Safety notes Power supply
The supply voltage is galvanically isolated from the housing. The devices can be
supplied either via the energy bus X10 or the connection terminal X9. The power
bus and the connection terminal are internally connected. Polarity is irrelevant.
supplied either via the energy bus X10 or the connection terminal X9. The power
bus and the connection terminal are internally connected. Polarity is irrelevant.
Commissioning of the hardware may only be carried out by qualified per-
sonnel in compliance with the safety regulations.
sonnel in compliance with the safety regulations.
Only switch on a device when the housing is closed.
Electric shocks and short-circuits due to incorrect voltage application.
Before commissioning, disconnect the entire system from the power supply and
check the connections after applying power.
check the connections after applying power.
The devices may only be connected to the supply voltage printed on the
identification plate.
identification plate.
The devices are designed for operation with safety extra-low voltage.
Accordingly, only SELV/PELV voltage circuits may be connected to the
supply voltage connections.
supply voltage connections.
The earth connection of the device serves exclusively as functional earth
(FE) according to EN 61131-2.
(FE) according to EN 61131-2.
Make sure that peripherals are suitable for the application environment.
The connecting cables must be designed for the ambient temperature.
If the switches are supplied with AC, surge voltages of up to 2000 V can
be expected between the active conductors and earth.
be expected between the active conductors and earth.
However, since the isolation voltage between functional earth (FE) and active
conductors is only 1000 V, external overvoltage protection is required between
the functional earth and at least one active conductor.
conductors is only 1000 V, external overvoltage protection is required between
the functional earth and at least one active conductor.
This overvoltage protection must limit the voltage to 1000 V.
Varistors of type 7N431K can be used for this purpose, for example.