Safety Instructions - HBM DWS2103 Kurzanleitung

6

Safety instructions

• There are not normally any hazards associated with the product, provided
the notes and instructions for project planning, installation, appropriate ope-
ration and maintenance are observed.
• Each time, before starting up the modules, you must first run a project planning
and risk analysis that takes into account all the safety aspects of automation
technology. This particularly concerns personal and machine protection.
• It is essential to comply with the safety and accident prevention regulations
specific to the particular application.
• Installation and start-up must only be carried out by suitably qualified personnel.
• Do not allow damp and dirt to get inside the device when connec. the cables.
• When connecting the cables, take action to prevent electrostatic discharge
as this may damage the electronics.
• The required power supply for the device is an extra-low voltage (10...30 V)
with safe disconnection from the mains.
• When connecting additional devices, comply with the safety requirements.
• The ground connections of the supply voltage, the interface and the load
cell cable shield are interconnected in the device. If the potentials of the de-
vices to be connected are different, suitable steps must be taken to isolate
the signals (such as using an optocoupler).
• Shielded cables must be used for all connections apart from the supply vol-
tage (see note below). The shield must be connected to the provided termi-
nals (Chapter 5.3, page 12).
• The use of unshielded cables for the voltage supply is only permissible for
cables with a maximum length of 30 m, laid inside buildings. If cables are
longer or are installed outside buildings, shielded cables must be used (as
per EN 61326−1).
• To compensate for potential differences, the metal housing of the
DWS2103 must be connected to the scale structures as well as to the
ground potential of the connected devices by a low-resistance equalizing
conductor. This is unnecessary if a potential difference of 35 V is not ex-
ceeded.
• In the device, the reference ground (GND) of all the signals and the supply vol-
tage is connected directly to the cable shield connection but not to the housing.
• Connection to a wide-ranging supply network is not permitted as this often
causes interfering voltage peaks to be coupled into the electronics. Instead,
a local supply must be provided for the DWS2103 (even when grouped).
• The front foil is made from high-quality materials, providing a service life
appropriate to the external conditions. The keys must only be operated by
hand; under no circumstances must pointed objects be used to press them.
HBM
DWS2103
A2936-1.0 en/de