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GFK-2734
Chapter 1 For your safety
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Direct/indirect contact
Protection against direct and indirect contact according to VDE 0100 Part 410 must be
ensured for all components connected to the system. In the event of an error, parasitic
voltages must not occur (single-fault tolerance).
This can be achieved by:
–
Using power supply units with safe isolation (PELV).
–
Decoupling circuits, which are not PELV systems, using optocouplers, relays, and
other components, which meet the requirements of safe isolation.
Power supply units for
24 V supply
Only use power supply units with safe isolation and PELV according to
EN 50178/VDE 0160 (PELV). This prevents short circuits between primary and secondary
sides.
Make sure that the output voltage of the power supply does not exceed 32 V even in the
event of an error.
Insulation rating
When selecting the operating equipment, please take into consideration the contamination
and surge voltages, which may occur during operation.
The IC220SDL840 module is designed for surge voltage category II (according to
DIN EN 60664-1). If you expect surge voltages in the system, which exceed the values
defined in surge voltage category II, take into consideration additional measures for
voltage limitation.
Installation and
configuration
Please observe the instructions for installing and configuring the system (see Section
"Documentation" on page 1-5).
WARNING: Depending on the application, incorrect installation and upgrades can
pose serious risks for the user
The user is obliged to design the devices used and their installation in the system
according to these requirements. This also means that existing plants and systems
retrofitted with VersaSafe or PROFIsafe must be checked and tested again in this respect.