6
Installation and Operation
EDBC250SIO | 2.0
49
6.2.4
Safety I/O-module Supply
The power supplied to the safe outputs and the associated test pulse outputs connects to
terminals L+ and L-. The supply voltage is rated at 24 VDC. It is monitored. In case of
overvoltage (> +20%) and low voltage (> -15%) alike, the module changes to its safe state.
WARNING
Potentially hazardous failures due to wrong voltages supplied
Supplying the wrong voltages may damage or destroy the unit and may provoke
potentially hazardous failures.
Preventive measures:
Only use PELV/SELV-ready power supply units to EN50178 or EN60950-1 to
supply 24 VDC to the I/Os of Safety I/O-module.
Fuse the I/O power supply of Safety I/O-module with max. 10 A.
Only use the GND terminal to connect the power supply unit to earth (PELV
system). Do not use earthing variants that connect earth to +24V.
Application in unearthed electrical networks, e.g. IT-Net, is only allowed
after consulting Lenze.
Remember that, even in case of a fault, a maximum voltage of U max. < 33 V
may be supplied to these assemblies.
Do not reuse but replace units operated on voltages > 33 V.
To ensure that there is as little interference as possible, install a central
power supply point and establish a star topology of as short wires as
possible between the central point and the block of c250-S modules.
Safety I/O-mdoule power supply fusing
The cord must have external protection against short circuit and overload triggering at max. 10
A, min. 60 V.
WARNING
Risk of fire due to short circuit!
A short circuit in the module or the power supply lines may cause the system to
overheat or provoke a fire.
Preventive measures:
Install a fuse triggering at max. 10 A.
Содержание c250-S
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