K23-SSI/USB/25B-C | SAFETY AND RESPONSIBILITY
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1.3 Installation
The device may only be installed and operated in an environment that meets the
permissible temperature range. Adequate ventilation must be ensured and the
device must not have any direct contact with hot or aggressive gases or liquids.
The unit must be disconnected from all voltage sources prior to installation and
before any maintenance work. It must also be ensured that no further danger can
arise from touching the disconnected voltage sources.
Devices that are supplied with AC voltage may only be connected to the low-
voltage network via switches or circuit breakers. This switch must be positioned
close to the device and must have a marking that identifies it as a disconnector.
Input and output cables for extra-low voltages must be separated from
dangerous, current-carrying cables by means of double or reinforced insulation
(SELV circuits).
All cables and insulation selected must correspond to the intended voltage and
temperature range. Device and country-specific standards must also be
observed, which apply to the cables in terms of design, shape, and quality. For
information on permissible cable cross sections for the screw terminal
connections, refer to the technical data.
Before commissioning, all connections and cables must be checked for a solid fit
in the screw terminals. All screw terminals (including unused ones) must be
screwed in as far as they will go to ensure that they are securely fastened and
cannot come loose in the event of mechanical vibrations.
Overvoltages at the connections to the device must be limited to the values of the
gas group II overvoltage category.
The general standards for switch cabinet construction in the machinery industry
and the manufacturer's specific shielding regulations apply with regard to
installation, wiring, ambient conditions, and shielding and grounding of supply
cables.
1.4 EMC Guidelines
This device is designed to provide high protection against electromagnetic
interference. Nevertheless you must minimize the influence of electromagnetic
noise to the device and all connected cables.
Therefore the following measures are mandatory for a successful installation and
operation:
Use shielded cables for all signal and control input and output lines.
Cables for digital controls (digital I/O, relay outputs) must not exceed a length
of 30 m and are allowed for in building operation only
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